Method and apparatus for compensating signals for frequency deviations

Claim 2

In a frequency compensation system for recording and reproducing a frequency modulated carrier signal, first means for producing a reference signal at a predetermined frequency, means for recording the modulated carrier signal and said reference signal simultaneously, means for simultaneously reproducing said recorded signals, means for separating the reproduced carrier signal and the reproduced reference signal, means for modulating one of said reproduced signals with a third signal at a fixed frequency to produce a first side band signal, and means for modulating said first side band signal with said other reproduced signal to produce a second side band signal having a center frequency with a fixed relationship to said predetermined frequency.

Claim 3

Apparatus for compensating a first signal, comprising an information component modulated on a carrier, for frequency deviations with the aid of a second signal having analogous frequency deviations, comprising means for combining one of said first and second signals with a signal at constant frequency to produce a first control signal containing a frequency component corresponding to said carrier and its frequency deviations and a standoff frequency component, means for combining the other of said first and second signals with said control signal to produce a second control signal at a fixed frequency modulated by said information component, and means for combining said second control signal with a signal at a fixed frequency to produce an output signal at the frequency of said carrier modulated by said information component.

Claim 4

Apparatus for compensating a first signal, comprising an information component modulated on a carrier, for frequency deviations with the aid of a second signal having analogous frequency deviations, comprising means for combining one of said first and second signals with a signal at constant frequency to produce a first control signal containing a frequency component corresponding to said carrier and its frequency deviations and a standoff frequency component, means for combining the other of said first and second signals with said control signal to produce a second control signal at a fixed frequency modulated by said information component, and means for combining said second control signal with a signal at a fixed frequency to produce an output signal at the frequency of said carrier modulated by said information component.

Claim 5

Apparatus for reproducing an information signal from a record on which a reference sigNal has been recorded with the information signal, said information signal comprising an information component modulated on a carrier component having a first frequency, said reference signal having a second frequency, said apparatus comprising reproducing means for simultaneously reproducing said information signal and said reference signal, means for combining one of said reproduced signals with a signal at a third fixed frequency to produce a control signal at a frequency determined by said third frequency and the carrier component of said reproduced information signal, means for combining said control signal with the other of said reproduced signals to produce an intermediate signal comprising a fixed frequency modulated by the information component in said reproduced information signal, and means for combining said intermediate signal with a signal at a fixed frequency determined by said first frequency and said fixed frequency component of said intermediate signal to produce an output signal at a frequency equal to said first frequency modulated by the information component of said reproduced information signal.

Claim 6

Apparatus for reproducing an information signal from a record on which a reference sigNal has been recorded with the information signal, said information signal comprising an information component modulated on a carrier component having a first frequency, said reference signal having a second frequency, said apparatus comprising reproducing means for simultaneously reproducing said information signal and said reference signal, means for combining one of said reproduced signals with a signal at a third fixed frequency to produce a control signal at a frequency determined by said third frequency and the carrier component of said reproduced information signal, means for combining said control signal with the other of said reproduced signals to produce an intermediate signal comprising a fixed frequency modulated by the information component in said reproduced information signal, and means for combining said intermediate signal with a signal at a fixed frequency determined by said first frequency and said fixed frequency component of said intermediate signal to produce an output signal at a frequency equal to said first frequency modulated by the information component of said reproduced information signal.

Claim 9

A frequency compensation system, comprising means for simultaneously reproducing an information signal and a reference signal from a record on which said signals were simultaneously recorded, said reproduced information signal having a frequency (fi + or - Delta fi) (N2/N1), where fi is a carrier frequency, Delta fi is an information component modulated on said carrier frequency, N2 is the speed at which said signals are reproduced, and N1 is the speed at which said signals were recorded, and said reproduced reference signal having a frequency fr(N2/N1), means for producing a second reference signal at a frequency f3, first modulating means responsive to said second reference signal for modulating said reproduced reference signal to produce a first output signal, frequency dividing means responsive to an applied signal for producing an output signal at a frequency equal to fi/fr times the frequency of the applied signal, filter means responsive to said first output signal for applying a signal to said frequency dividing means at a frequency f3-(N2/N1) fr to cause said frequency dividing means to produce an output signal at a frequency (f3fi/fr) - (N2fi/N1), second modulating means responsive to said reproduced information signal and the output signal from said frequency dividing means for producing an output signal at a frequency equal to (f3fi/fr) + or - (N2/N1) Delta fi, means for producing a third reference signal at a frequency (f3fi/fr)-fi, and third modulating means responsive to said third reference signal and to the output signal from said second modulating means for producing an output signal at a frequency fi + or - (N2/N1) Delta fi.

Claim 10

A frequency compensation system, comprising means for simultaneously reproducing an information signal and a reference signal from a record on which said signals were simultaneously recorded, said reproduced information signal having a frequency (fi + or - Delta fi) (N2/N1), where fi is a carrier frequency, Delta fi is an information component modulated on said carrier frequency, N2 is the speed at which said signals are reproduced, and N1 is the speed at which said signals were recorded, and said reproduced reference signal having a frequency fr(N2/N1), means for producing a second reference signal at a frequency f3, first modulating means responsive to said second reference signal for modulating said reproduced reference signal to produce a first output signal, frequency dividing means responsive to an applied signal for producing an output signal at a frequency equal to fi/fr times the frequency of the applied signal, filter means responsive to said first output signal for applying a signal to said frequency dividing means at a frequency f3-(N2/N1) fr to cause said frequency dividing means to produce an output signal at a frequency (f3fi/fr) - (N2fi/N1), second modulating means responsive to said reproduced information signal and the output signal from said frequency dividing means for producing an output signal at a frequency equal to (f3fi/fr) + or - (N2/N1) Delta fi, means for producing a third reference signal at a frequency (f3fi/fr)-fi, and third modulating means responsive to said third reference signal and to the output signal from said second modulating means for producing an output signal at a frequency fi + or - (N2/N1) Delta fi.

Claim 11

Apparatus for compensating an information signal reproduced from a record for errors in frequency with the aid of a reference signal simultaneously reproduced from the same record and having proportional errors in frequency, comprising means for deriving a control signal from said reference signal in which the frequency errors are substantially equal in amplitude to the errors in said information signal, and means for combining said information signal with said control signal to produce an output signal in which said errors are cancelled.

Claim 12

Apparatus for compensating an information signal reproduced from a record for errors in frequency with the aid of a reference signal simultaneously reproduced from the same record and having proportional errors in frequency, comprising means for deriving a control signal from said reference signal in which the frequency errors are substantially equal in amplitude to the errors in said information signal, and means for combining said information signal with said control signal to produce an output signal in which said errors are cancelled.

Claim 13

Apparatus for compensating a frequency modulated information signal reproduced from a record for errors in frequency with the aid of a reference signal simultaneously reproduced from the same record and having proportional errors in frequency, comprising means for deriving a control signal from said reference signal in which the frequency errors are substantially equal in amplitude to the errors in said information signal, means for modulating said information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, and filter means responsive to said modulating means for selectively applying said second side band to said output terminal.

Claim 14

Apparatus for compensating a frequency modulated information signal reproduced from a record for errors in frequency with the aid of a reference signal simultaneously reproduced from the same record and having proportional errors in frequency, comprising means for deriving a control signal from said reference signal in which the frequency errors are substantially equal in amplitude to the errors in said information signal, means for modulating said information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, and filter means responsive to said modulating means for selectively applying said second side band to said output terminal.

Claim 15

Apparatus for compensating an information signal frequency modulated about a first frequency for errors in frequency with the aid of a reference signal having proportional errors in frequency about a second frequency, comprising means for multiplying said reference frequency by the ratio of said first frequency to said second frequency to produce a control signal in which the frequency errors are approximately equal in amplitude to the errors in said information signal, means for modulating said information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, and means responsive to said modulating means for selectively applying said second side band to said output terminal.

Claim 16

Apparatus for compensating an information signal frequency modulated about a first frequency for errors in frequency with the aid of a reference signal having proportional errors in frequency about a second frequency, comprising means for multiplying said reference frequency by the ratio of said first frequency to said second frequency to produce a control signal in which the frequency errors are approximately equal in amplitude to the errors in said information signal, means for modulating said information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, and means responsive to said modulating means for selectively applying said second side band to said output terminal.

Claim 17

Apparatus for compensating a frequency modulated information signal for errors in center frequency from a first frequency with the aid of a reference signal having proportional errors in frequency from a second frequency, comprising means for producing a first standoff signal at a fixed third frequency, means for combining said reference signal and said first standoff signal to produce a first control signal at a frequency offset from the frequency of said reference signal, means fo multiplying said first control signal by the ratio of said first frequency to said second frequency to produce a second control signal offset from said first frequency and containing frequency errors approximately equal in amplitude to the errors in said information signal, means for combining said information signal and said second control signal to produce an intermediate signal offset from said first frequency in which said errors are cancelled, means for producing a second standoff signal at a fixed fourth frequency determined by said first, second and third frequencies to differ from the frequency of said intermediate signal by said first frequency, and means for combining said second standoff signal and said intermediate signal to produce a compensated output signal.

Claim 18

Apparatus for compensating a frequency modulated information signal for errors in center frequency from a first frequency with the aid of a reference signal having proportional errors in frequency from a second frequency, comprising means for producing a first standoff signal at a fixed third frequency, means for combining said reference signal and said first standoff signal to produce a first control signal at a frequency offset from the frequency of said reference signal, means fo multiplying said first control signal by the ratio of said first frequency to said second frequency to produce a second control signal offset from said first frequency and containing frequency errors approximately equal in amplitude to the errors in said information signal, means for combining said information signal and said second control signal to produce an intermediate signal offset from said first frequency in which said errors are cancelled, means for producing a second standoff signal at a fixed fourth frequency determined by said first, second and third frequencies to differ from the frequency of said intermediate signal by said first frequency, and means for combining said second standoff signal and said intermediate signal to produce a compensated output signal.

Claim 19

The apparatus of claim 8, in which said means for producing said first control signal comprises modulating means responsive to said reference signal and said first standoff signal for producing a signal containing first and second side bands and filter means responSive to said modulating means for selectively producing said first side band as said first control signal.

Claim 20

The apparatus of claim 10, in which said means for combining said information signal and said second control signal comprises second modulating means for producing a signal containing upper and lower side bands, and filter means responsive to said second modulating means for selectively producing, as said intermediate signal, said upper or said lower side band, respectively, in dependence on whether said first side band is lower or higher in frequency than said second side band, respectively.

Claim 21

Apparatus for recording on a second record an information signal recorded on a first record simultaneously with a reference signal, comprising reproducing means for simultaneously reproducing said signals from said first record, signal generating means controlled by said reproducing means and selectively responsive to said reproduced reference signal for producing a control signal from said reproduced reference signal in which frequency errors due to wow and flutter are substantially equal in amplitude to corresponding wow and flutter errors in said reproduced information signal, means responsive to said control signal and selectively responsive to the information signal reproduced by said reproducing means for combining said reproduced information signal with said control signal to produce an output signal in which said errors are cancelled, means for producing a second reference signal at constant frequency, and recording means for simultaneously recording said output signal and said second reference signal on said second record.

Claim 22

Apparatus for recording on a second record an information signal recorded on a first record simultaneously with a reference signal, comprising reproducing means for simultaneously reproducing said signals from said first record, signal generating means controlled by said reproducing means and selectively responsive to said reproduced reference signal for producing a control signal from said reproduced reference signal in which frequency errors due to wow and flutter are substantially equal in amplitude to corresponding wow and flutter errors in said reproduced information signal, means responsive to said control signal and selectively responsive to the information signal reproduced by said reproducing means for combining said reproduced information signal with said control signal to produce an output signal in which said errors are cancelled, means for producing a second reference signal at constant frequency, and recording means for simultaneously recording said output signal and said second reference signal on said second record.

Claim 23

Apparatus for recording on a second record a frequency modulated information signal recorded on a first record simultaneously with a reference signal, comprising reproducing means for simultaneously reproducing said signals from said first record, signal generating means controlled by said reproducing means and selectively responsive to said reproduced reference signal for producing a control signal from said reproduced reference signal in which frequency errors due to wow and flutter are substantially equal in amplitude to corresponding frequency errors in said reproduced information signal, means responsive to said control signal and selectively responsive to the information signal reproduced by said reproducing means for modulating said reproduced information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, filter means responsive to said modulating means for selectively applying said second side band to said output terminal, oscillator means for producing a second reference signal, and recording means connected to said output terminal and to said oscillator means for simultaneously recording said second side band and said second reference signal on said second record.

Claim 24

Apparatus for recording on a second record a frequency modulated information signal recorded on a first record simultaneously with a reference signal, comprising reproducing means for simultaneously reproducing said signals from said first record, signal generating means controlled by said reproducing means and selectively responsive to said reproduced reference signal for producing a control signal from said reproduced reference signal in which frequency errors due to wow and flutter are substantially equal in amplitude to corresponding frequency errors in said reproduced information signal, means responsive to said control signal and selectively responsive to the information signal reproduced by said reproducing means for modulating said reproduced information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, filter means responsive to said modulating means for selectively applying said second side band to said output terminal, oscillator means for producing a second reference signal, and recording means connected to said output terminal and to said oscillator means for simultaneously recording said second side band and said second reference signal on said second record.

Claim 25

Apparatus for recording on a second record a frequency modulated information signal having a first center frequency and recorded on a first record simultaneously with a reference signal having a second frequency, comprising reproducing means for simultaneously reproducing said signals from said first record, multiplying means controlled by said reproducing means and selectively responsive to said reproduced reference signal for multiplying the frequency of said reproduced reference signal by the ratio of said first frequency to said second frequency to produce a control signal in which frequency errors due to wow and flutter are approximately equal in amplitude to the errors in said reproduced information signal, means for modulating said reproduced information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, means responsive to said modulating means for selectively Applying said second side band to said output terminal, oscillator means for producing a second reference signal, and recording means connected to said output terminal and to said oscillator means for simultaneously recording said second side band and said second reference signal on said second record.

Claim 26

Apparatus for recording on a second record a frequency modulated information signal having a first center frequency and recorded on a first record simultaneously with a reference signal having a second frequency, comprising reproducing means for simultaneously reproducing said signals from said first record, multiplying means controlled by said reproducing means and selectively responsive to said reproduced reference signal for multiplying the frequency of said reproduced reference signal by the ratio of said first frequency to said second frequency to produce a control signal in which frequency errors due to wow and flutter are approximately equal in amplitude to the errors in said reproduced information signal, means for modulating said reproduced information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, means responsive to said modulating means for selectively Applying said second side band to said output terminal, oscillator means for producing a second reference signal, and recording means connected to said output terminal and to said oscillator means for simultaneously recording said second side band and said second reference signal on said second record.

Claim 27

Apparatus for recording on a second record a frequency modulated information signal having a first center frequency recorded on a first record simultaneously with a reference signal at a second frequency, comprising reproducing means for simultaneously reproducing said signals from said first record, means for producing a first standoff signal at a fixed third frequency, means responsive to said standoff signal and selectively responsive to said reproducing means for combining said reference signal and said first standoff signal to produce a first control signal at a frequency offset from the frequency of said reference signal, means for multiplying said control signal by the ratio of said first frequency to said second frequency to produce a second control signal offset from said first frequency and containing frequency errors due to wow and flutter approximately equal in amplitude to the corresponding errors in said information signal, means for combining said information signal and said second control signal to produce an intermediate signal offset from said first frequency in which said errors are cancelled, means for producing a second standoff signal at a fixed fourth frequency determined by said first, second and third frequencies to differ from the frequency of said intermediate signal by said first frequency, means for combining said second standoff signal and said intermediate signal to produce a compensated output signal, means for producing a second reference signal at constant frequency, and recording means for simultaneously recording said compensated output signal and said second reference signal on said second record.

Claim 28

Apparatus for recording on a second record a frequency modulated information signal having a first center frequency recorded on a first record simultaneously with a reference signal at a second frequency, comprising reproducing means for simultaneously reproducing said signals from said first record, means for producing a first standoff signal at a fixed third frequency, means responsive to said standoff signal and selectively responsive to said reproducing means for combining said reference signal and said first standoff signal to produce a first control signal at a frequency offset from the frequency of said reference signal, means for multiplying said control signal by the ratio of said first frequency to said second frequency to produce a second control signal offset from said first frequency and containing frequency errors due to wow and flutter approximately equal in amplitude to the corresponding errors in said information signal, means for combining said information signal and said second control signal to produce an intermediate signal offset from said first frequency in which said errors are cancelled, means for producing a second standoff signal at a fixed fourth frequency determined by said first, second and third frequencies to differ from the frequency of said intermediate signal by said first frequency, means for combining said second standoff signal and said intermediate signal to produce a compensated output signal, means for producing a second reference signal at constant frequency, and recording means for simultaneously recording said compensated output signal and said second reference signal on said second record.

Claim 29

The process of recording and reproducing an information signal having at least one frequency component in one of first and second sub-bands in a predetermined band, comprising the steps of recording said information signal simultaneously with at least one reference signal at a constant frequency, simultaneously reproducing said signals, shifting the frequency of said information signal by a first fixed amount in a predetermined phase, separating said frequency shifted information signal into at least two sub-bands to produce first and second component signals at least one of which has an amplitude greater than zero and each differing from a different one of said first and second sub-bands by said first fixed amount, deriving at least two signals from the reproduced reference signal at different frequencies each centered in one of said first and second sub-bands, reducing the frequency of each of said component signals by an amount equal to the frequency of the derived reference signal centered in the sub-band from which it was produced to produce first and second compensated signals in which wow and flutter errors introduced in recording and reproduction are approximately cancelled, increasing the frequency of each of said compensated signals by one of a set of second fixed amounts equal to the center frequency in the sub-band from which it was produced to produce first and second intermediate signals, shifting the frequencies of said intermediate signals by said first fixed amount in a sense opposite said predetermined sense to produce third and fourth compensated signals having amplitudes proportional to the amplitudes of said first and second component signals and frequencies in said first and second sub-bands, and summing said third and fourth signals to produce a compensated output signal.

Claim 30

The process of recording and reproducing an information signal having at least one frequency component in one of first and second sub-bands in a predetermined band, comprising the steps of recording said information signal simultaneously with at least one reference signal at a constant frequency, simultaneously reproducing said signals, shifting the frequency of said information signal by a first fixed amount in a predetermined phase, separating said frequency shifted information signal into at least two sub-bands to produce first and second component signals at least one of which has an amplitude greater than zero and each differing from a different one of said first and second sub-bands by said first fixed amount, deriving at least two signals from the reproduced reference signal at different frequencies each centered in one of said first and second sub-bands, reducing the frequency of each of said component signals by an amount equal to the frequency of the derived reference signal centered in the sub-band from which it was produced to produce first and second compensated signals in which wow and flutter errors introduced in recording and reproduction are approximately cancelled, increasing the frequency of each of said compensated signals by one of a set of second fixed amounts equal to the center frequency in the sub-band from which it was produced to produce first and second intermediate signals, shifting the frequencies of said intermediate signals by said first fixed amount in a sense opposite said predetermined sense to produce third and fourth compensated signals having amplitudes proportional to the amplitudes of said first and second component signals and frequencies in said first and second sub-bands, and summing said third and fourth signals to produce a compensated output signal.

Claim 31

In combination, means for simultaneously reproducing an information signal having a frequency in a predetermined range and a reference signal from a record on which said signals have been simultaneously recorded, means for modulaTing said reproduced information signal at a first fixed frequency to produce a first modulated signal, means selectively responsive to said first modulated signal for producing a first side band signal, means responsive to said reproduced reference signal for modulating said first side band signal at a frequency varying with the frequency of said reproduced reference signal and at least approximately centered in said predetermined range to produce a second modulated signal, means selectively responsive to said second modulated signal for producing a second side band signal in which wow and flutter errors are approximately cancelled, means for modulating said second side band signal at a second fixed frequency equal to the center frequency at which said first side band signal was modulated to produce a third modulated signal, means selectively responsive to said third modulated signal for producing a third side band signal, means for modulating said third side band signal at said first fixed frequency to produce a fourth modulated signal, and means selectively responsive to said fourth modulated signal for producing an output signal at the frequency of said recorded information signal.

Claim 32

In combination, means for simultaneously reproducing an information signal having a frequency in a predetermined range and a reference signal from a record on which said signals have been simultaneously recorded, means for modulaTing said reproduced information signal at a first fixed frequency to produce a first modulated signal, means selectively responsive to said first modulated signal for producing a first side band signal, means responsive to said reproduced reference signal for modulating said first side band signal at a frequency varying with the frequency of said reproduced reference signal and at least approximately centered in said predetermined range to produce a second modulated signal, means selectively responsive to said second modulated signal for producing a second side band signal in which wow and flutter errors are approximately cancelled, means for modulating said second side band signal at a second fixed frequency equal to the center frequency at which said first side band signal was modulated to produce a third modulated signal, means selectively responsive to said third modulated signal for producing a third side band signal, means for modulating said third side band signal at said first fixed frequency to produce a fourth modulated signal, and means selectively responsive to said fourth modulated signal for producing an output signal at the frequency of said recorded information signal.

Claim 33

Apparatus for reproducing an information signal having frequencies in a predetermined range, said information signal having been recorded on a record simultaneously with at least two reference signals at different fixed frequencies, comprising reproducing means for simultaneously reproducing said information signal and said reference signals, first modulating means for modulating said reproduced information signal at a constant standoff frequency to produce a first modulated signal, first, second, third and fourth band pass filters connected to said first modulating means for producing from said first modulated signal first, second, third and fourth side band signals each having frequencies offset from a different sub-band of said range by said standoff frequency, said sub-bands collectively covering said range, means selectively responsive to said reproducing means for separately producing said first reproduced reference signal, means selectively responsive to said reproducing means for separately producing said second reproduced reference signal, second modulating means responsive to said first reproduced reference signal for modulating said first side band signal at a frequency approximately centered in the sub-band of said first component signal and varying in accordance with wow and flutter variations in said first reproduced reference signal to produce a fifth modulated signal, third modulating means responsive to said second reproduced reference signal for modulating said second side band signal at a frequency approximately centered in the sub-band of said second component signal and varying in accordance with wow and flutter variations in said second reproduced reference signal to produce a sixth modulated signal, first dividing means responsive to said first reproduced reference signal for producing a first derived reference signal at a predetermined fraction of the frequency of said first reproduced reference signal and approximately centered in the sub-band of said third component signal, fourth modulating means for modulating said third side band signal at the frequency of said first derived reference signal to produce a seventh modulated signal, second dividing means responsive to said second reproduced reference signal for producing a second derived reference signal at a predetermined fraction of the frequency of said second reproduced reference signal and approximately centered in the sub-band of said fourth component signal, fifth modulating means for modulating said fourth side band signal at the frequency of said second derived reference signal to produce an eighth modulated signal, means selectively responsive to said fifth, sixth, seventh and eighth modulated signals, respectively, for producing fifth, sixth, seventh and eighth side band signals, respecTively, each shifted from the frequency of the corresponding first, second, third and fourth side band signal in a sense opposite said shift from said standoff frequency, means for producing first, second, third and fourth fixed reference signals at frequencies equal, respectively, to the frequency at which said first reference signal was recorded, the frequency at which said second reference signal was recorded, the fraction of the frequency at which said first reference signal was recorded produced by said first dividing means, and the fraction of the frequency at which said second reference signal was recorded produced by said second dividing means, sixth modulating means for modulating said fifth side band signal at the frequency of said first fixed reference signal to produce a ninth modulated signal, seventh modulating means for modulating said sixth side band signal at the frequency of said second fixed reference signal to produce a 10th modulated signal, eighth modulating means for modulating said seventh side band signal at the frequency of said third fixed reference signal to produce an 11th modulated signal, ninth modulating means for modulating said eighth side band signal at the frequency of said fourth fixed reference signal to produce a 12th modulated signal, means selectively responsive to said ninth, 10th, 11th and 12th modulated signals for producing ninth, 10th, 11th and 12th side band signals, respectively, each shifted from the frequency of the corresponding fifth, sixth, seventh and eighth side band signal in the same sense as said shift from said standoff frequency, 10th, 11th, 12th and 13th modulating means for modulating said ninth, 10th, 11th and 12th side band signals at said standoff frequency to produce 13th, 14th, 15th and 16th modulated signals, respectively, means selectively responsive to said 13th, 14th, 15th and 16th modulated signals for producing 13th, 14th, 15th and 16th side band signals at frequencies in the sub-bands of said first, second, third and fourth component signals, respectively, and summing means responsive to said 13th, 14th, 15th and 16th side band signals for producing an output signal.

Claim 34

Apparatus for reproducing an information signal having frequencies in a predetermined range, said information signal having been recorded on a record simultaneously with at least two reference signals at different fixed frequencies, comprising reproducing means for simultaneously reproducing said information signal and said reference signals, first modulating means for modulating said reproduced information signal at a constant standoff frequency to produce a first modulated signal, first, second, third and fourth band pass filters connected to said first modulating means for producing from said first modulated signal first, second, third and fourth side band signals each having frequencies offset from a different sub-band of said range by said standoff frequency, said sub-bands collectively covering said range, means selectively responsive to said reproducing means for separately producing said first reproduced reference signal, means selectively responsive to said reproducing means for separately producing said second reproduced reference signal, second modulating means responsive to said first reproduced reference signal for modulating said first side band signal at a frequency approximately centered in the sub-band of said first component signal and varying in accordance with wow and flutter variations in said first reproduced reference signal to produce a fifth modulated signal, third modulating means responsive to said second reproduced reference signal for modulating said second side band signal at a frequency approximately centered in the sub-band of said second component signal and varying in accordance with wow and flutter variations in said second reproduced reference signal to produce a sixth modulated signal, first dividing means responsive to said first reproduced reference signal for producing a first derived reference signal at a predetermined fraction of the frequency of said first reproduced reference signal and approximately centered in the sub-band of said third component signal, fourth modulating means for modulating said third side band signal at the frequency of said first derived reference signal to produce a seventh modulated signal, second dividing means responsive to said second reproduced reference signal for producing a second derived reference signal at a predetermined fraction of the frequency of said second reproduced reference signal and approximately centered in the sub-band of said fourth component signal, fifth modulating means for modulating said fourth side band signal at the frequency of said second derived reference signal to produce an eighth modulated signal, means selectively responsive to said fifth, sixth, seventh and eighth modulated signals, respectively, for producing fifth, sixth, seventh and eighth side band signals, respecTively, each shifted from the frequency of the corresponding first, second, third and fourth side band signal in a sense opposite said shift from said standoff frequency, means for producing first, second, third and fourth fixed reference signals at frequencies equal, respectively, to the frequency at which said first reference signal was recorded, the frequency at which said second reference signal was recorded, the fraction of the frequency at which said first reference signal was recorded produced by said first dividing means, and the fraction of the frequency at which said second reference signal was recorded produced by said second dividing means, sixth modulating means for modulating said fifth side band signal at the frequency of said first fixed reference signal to produce a ninth modulated signal, seventh modulating means for modulating said sixth side band signal at the frequency of said second fixed reference signal to produce a 10th modulated signal, eighth modulating means for modulating said seventh side band signal at the frequency of said third fixed reference signal to produce an 11th modulated signal, ninth modulating means for modulating said eighth side band signal at the frequency of said fourth fixed reference signal to produce a 12th modulated signal, means selectively responsive to said ninth, 10th, 11th and 12th modulated signals for producing ninth, 10th, 11th and 12th side band signals, respectively, each shifted from the frequency of the corresponding fifth, sixth, seventh and eighth side band signal in the same sense as said shift from said standoff frequency, 10th, 11th, 12th and 13th modulating means for modulating said ninth, 10th, 11th and 12th side band signals at said standoff frequency to produce 13th, 14th, 15th and 16th modulated signals, respectively, means selectively responsive to said 13th, 14th, 15th and 16th modulated signals for producing 13th, 14th, 15th and 16th side band signals at frequencies in the sub-bands of said first, second, third and fourth component signals, respectively, and summing means responsive to said 13th, 14th, 15th and 16th side band signals for producing an output signal.

Claim 35

Apparatus for compensating an information signal centered at a first frequency for frequency deviations with the aid of a reference signal at a second frequency and having proportional frequency deviations, comprising signal generating means responsive to the reference signal for producing a control signal at a frequency offset by a fixed amount from said second frequency and containing at least a reference signal component that is divided by the ratio of said second frequency to said first frequency, means controlled by said signal generating means and responsive to the information signal for mixing the information signal with the control signal to produce a modulated signal containing a side band in which said frequency deviations are substantially cancelled, means selectively responsive to said modulated signal for producing a side band signal at the frequency of said side band, and means for offsetting the frequency of said side band signal to produce a compensated information signal centered at said first frequency.

Claim 36

Apparatus for compensating an information signal centered at a first frequency for frequency deviations with the aid of a reference signal at a second frequency and having proportional frequency deviations, comprising signal generating means responsive to the reference signal for producing a control signal at a frequency offset by a fixed amount from said second frequency and containing at least a reference signal component that is divided by the ratio of said second frequency to said first frequency, means controlled by said signal generating means and responsive to the information signal for mixing the information signal with the control signal to produce a modulated signal containing a side band in which said frequency deviations are substantially cancelled, means selectively responsive to said modulated signal for producing a side band signal at the frequency of said side band, and means for offsetting the frequency of said side band signal to produce a compensated information signal centered at said first frequency.

Claim 37

Apparatus for compensating an information signal recorded on a record medium simultaneously with a reference signal, comprising means for simultaneously reproducing said recorded signals, a first modulator responsive to two applied signals for producing a modulated signal comprising signal components having frequencies equal to the sum and difference of the frequencies of the applied signals, a first channel comprising a first filter having a first delay connected between said reproducing means and said first modulator and selectively responsive to a first of said recorded signals for applying a first signal to saId first modulator at a frequency at least proportional to the frequency of said first recorded signal, a second channel comprising a second filter selectively responsive to said other recorded signal and having a delay equal to said first delay and a second modulator, said second channel being connected between said reproducing means and said first modulator for applying a second signal to said first modulator.

Claim 38

Apparatus for compensating an information signal recorded on a record medium simultaneously with a reference signal, comprising means for simultaneously reproducing said recorded signals, a first modulator responsive to two applied signals for producing a modulated signal comprising signal components having frequencies equal to the sum and difference of the frequencies of the applied signals, a first channel comprising a first filter having a first delay connected between said reproducing means and said first modulator and selectively responsive to a first of said recorded signals for applying a first signal to saId first modulator at a frequency at least proportional to the frequency of said first recorded signal, a second channel comprising a second filter selectively responsive to said other recorded signal and having a delay equal to said first delay and a second modulator, said second channel being connected between said reproducing means and said first modulator for applying a second signal to said first modulator.

Claim 39

In apparatus for compensating an information signal for wow and flutter deviations with the aid of a reference signal having wow and flutter deviations proportional to the deviations in said reference signal and in time correspondence therewith, a first signal processing channel having a first delay for modifying the center frequency of the wow and flutter deviations in one of said signals to make them approximately equal to the wow and flutter deviations in the other signal, a second signal processing channel having a delay equal to said first delay for transmitting the other signal, means in one of said channels for offsetting the center frequency of the signal in the channel without modifying the frequency of the wow and flutter components thereof, modulating means controlled by both of said channels for modulating one of said signals with the other signal and producing a modulated output signal containing at least upper and lower side bands at sum and different frequencies determined by the output signals of said channels, and filter means for producing an output signal in accordance with one of said side band signals.

Claim 40

In apparatus for compensating an information signal for wow and flutter deviations with the aid of a reference signal having wow and flutter deviations proportional to the deviations in said reference signal and in time correspondence therewith, a first signal processing channel having a first delay for modifying the center frequency of the wow and flutter deviations in one of said signals to make them approximately equal to the wow and flutter deviations in the other signal, a second signal processing channel having a delay equal to said first delay for transmitting the other signal, means in one of said channels for offsetting the center frequency of the signal in the channel without modifying the frequency of the wow and flutter components thereof, modulating means controlled by both of said channels for modulating one of said signals with the other signal and producing a modulated output signal containing at least upper and lower side bands at sum and different frequencies determined by the output signals of said channels, and filter means for producing an output signal in accordance with one of said side band signals.

Claim 41

In a frequency compensation system for recording and reproducing a frequency modulated carrier signal, first means for producing a reference signal at a predetermined frequency, means for recording the modulated carrier signal and said reference signal simultaneously, means for simultaneously reproducing said recorded signals, first filter means selectively responsive to a first of said reproduced signals for producing a first delayed signal, second filter means selectively responsive to the second of said reproduced signals for producing a second delayed signal, said delayed signals being equally delayed relative to said reproduced signals, means for modulating one of said reproduced signals with a third signal at a fixed frequency to produce a first side band signal, and means for modulating said first side band signal with said other reproduced signal to produce a second side band signal having a center frequency with a fixed relationship to said predetermined frequency.

Claim 42

In a frequency compensation system for recording and reproducing a frequency modulated carrier signal, first means for producing a reference signal at a predetermined frequency, means for recording the modulated carrier signal and said reference signal simultaneously, means for simultaneously reproducing said recorded signals, first filter means selectively responsive to a first of said reproduced signals for producing a first delayed signal, second filter means selectively responsive to the second of said reproduced signals for producing a second delayed signal, said delayed signals being equally delayed relative to said reproduced signals, means for modulating one of said reproduced signals with a third signal at a fixed frequency to produce a first side band signal, and means for modulating said first side band signal with said other reproduced signal to produce a second side band signal having a center frequency with a fixed relationship to said predetermined frequency.

Claim 43

Apparatus for compensating a first signal, comprising an information component modulated on a carrier, for frequency deviations with the aid of a second signal having analogous frequency deviations, comprising first circuit means having a first delay for combining one of said first and second signals with a signal at constant frequency to produce a first control signal containing a frequency component corresponding to said carrier and its frequency deviations and a standoff frequency component, second circuit means having a delay equal to said first delay for producing a delayed signal in accordance with the other of said first and second signals, means for combining said delayed signal with said control signal to produce a second control signal at a fixed frequency modulated by said information component, and means for combining said second control signal with a signal at a fixed frequency to produce an output signal at the frequency of said carrier modulated by said information component.

Claim 44

Apparatus for compensating a first signal, comprising an information component modulated on a carrier, for frequency deviations with the aid of a second signal having analogous frequency deviations, comprising first circuit means having a first delay for combining one of said first and second signals with a signal at constant frequency to produce a first control signal containing a frequency component corresponding to said carrier and its frequency deviations and a standoff frequency component, second circuit means having a delay equal to said first delay for producing a delayed signal in accordance with the other of said first and second signals, means for combining said delayed signal with said control signal to produce a second control signal at a fixed frequency modulated by said information component, and means for combining said second control signal with a signal at a fixed frequency to produce an output signal at the frequency of said carrier modulated by said information component.

Claim 45

Apparatus for reproducing an information signal from a record on which a reference signal has been recorded with the information signal, said information signal comprising an information component modulated on a carrier component having a first frequency, said reference signal having a second frequency, said apparatus comprising reproducing means for simultaneously reproducing said information signal and said reference signal, first circuit means having a first delAy for combining one of said reproduced signals with a signal at a third fixed frequency to produce a control signal at a frequency determined by said third frequency and the carrier component of said reproduced information signal, second circuit means having a delay equal to said first delay for producing a delayed signal in accordance with the other of said reproduced signals, means for combining said control signal with said delayed signal to produce an intermediate signal comprising a fixed frequency modulated by the information component in said reproduced information signal, and means for combining said intermediate signal with a signal at a fixed frequency determined by said first frequency and said fixed frequency component of said intermediate signal to produce an output signal at a frequency equal to said first frequency modulated by the information component of said reproduced information signal.

Claim 46

Apparatus for reproducing an information signal from a record on which a reference signal has been recorded with the information signal, said information signal comprising an information component modulated on a carrier component having a first frequency, said reference signal having a second frequency, said apparatus comprising reproducing means for simultaneously reproducing said information signal and said reference signal, first circuit means having a first delAy for combining one of said reproduced signals with a signal at a third fixed frequency to produce a control signal at a frequency determined by said third frequency and the carrier component of said reproduced information signal, second circuit means having a delay equal to said first delay for producing a delayed signal in accordance with the other of said reproduced signals, means for combining said control signal with said delayed signal to produce an intermediate signal comprising a fixed frequency modulated by the information component in said reproduced information signal, and means for combining said intermediate signal with a signal at a fixed frequency determined by said first frequency and said fixed frequency component of said intermediate signal to produce an output signal at a frequency equal to said first frequency modulated by the information component of said reproduced information signal.

Claim 49

A frequency compensation system, comprising means for simultaneously reproducing an information signal and a reference signal from a record on which said signals were simultaneously recorded, said reproduced information signal having a frequency (fi + or - Delta fi) (N2/N1), where fi is a carrier frequency, Delta fi is an information component modulated on said carrier frequency, N2 is the speed at which said signals are reproduced, and N1 is the speed at which said signals were recorded, and said reproduced reference signal having a frequency fr (N2/N1), filter means having matched delays for separating said reproduced signals while preserving their time correspondence, means for producing a second reference signal at a frequency f3, first modulating means responsive to said second reference signal for modulating said separated reference signal to produce a first output signal, frequency dividing means responsive to an applied signal for producing an output signal at a frequency equal to fi/fr times the frequency of the applied signal, filter means responsive to said first output signal for applying a signal to said frequency dividing means at a frequency f3-(N2/N1) fr to cause said frequency dividing means to produce an output signal at a frequency (f3fi/fr) - (N2fi/N1), second modulating means responsive to said separated information signal and the output signal from said frequency dividing means for producing an output signal at a frequency equal to (f3fi/fr) + or - (N2/N1) Delta fi, means for producing a third reference signal at a frequency (f3fi/fr) - fi, and third modulating means responsive to said third reference signal and to the output signal from said second modulating means for producing an output signal at a frequency fi + or - (N2/N1) Delta fi.

Claim 50

A frequency compensation system, comprising means for simultaneously reproducing an information signal and a reference signal from a record on which said signals were simultaneously recorded, said reproduced information signal having a frequency (fi + or - Delta fi) (N2/N1), where fi is a carrier frequency, Delta fi is an information component modulated on said carrier frequency, N2 is the speed at which said signals are reproduced, and N1 is the speed at which said signals were recorded, and said reproduced reference signal having a frequency fr (N2/N1), filter means having matched delays for separating said reproduced signals while preserving their time correspondence, means for producing a second reference signal at a frequency f3, first modulating means responsive to said second reference signal for modulating said separated reference signal to produce a first output signal, frequency dividing means responsive to an applied signal for producing an output signal at a frequency equal to fi/fr times the frequency of the applied signal, filter means responsive to said first output signal for applying a signal to said frequency dividing means at a frequency f3-(N2/N1) fr to cause said frequency dividing means to produce an output signal at a frequency (f3fi/fr) - (N2fi/N1), second modulating means responsive to said separated information signal and the output signal from said frequency dividing means for producing an output signal at a frequency equal to (f3fi/fr) + or - (N2/N1) Delta fi, means for producing a third reference signal at a frequency (f3fi/fr) - fi, and third modulating means responsive to said third reference signal and to the output signal from said second modulating means for producing an output signal at a frequency fi + or - (N2/N1) Delta fi.

Claim 51

Apparatus for compensating an information signal reproduced from a record for errors in frequency with the aid of a reference signal simultaneously reproduced from the same record and having proportional errors in frequency, comprising means for deriving a delayed control signal from said reference signal in which the frequency errors are substantially equal in amplitude to the errors in said information signal and having a first delay, means for delaying said information signal by an amount equal to said first delay, and means for combining said delayed information signal with said control signal to produce an output signal in which said errors are cancelled.

Claim 52

Apparatus for compensating an information signal reproduced from a record for errors in frequency with the aid of a reference signal simultaneously reproduced from the same record and having proportional errors in frequency, comprising means for deriving a delayed control signal from said reference signal in which the frequency errors are substantially equal in amplitude to the errors in said information signal and having a first delay, means for delaying said information signal by an amount equal to said first delay, and means for combining said delayed information signal with said control signal to produce an output signal in which said errors are cancelled.

Claim 53

Apparatus for compensating a frequency modulated information signal reproduced from a record for errors in frequency with the aid of a reference signal simultaneously reproduced from the same record and having proportional errors in frequency, comprising filter means having matched delays for separating said reproduced signals to produce a delayed information signal and a correspondingly delayed reference signal, means for deriving a control signal from said delayed reference signal in which the frequency errors are substantially equal in amplitude to the errors in said information signal, means for modulating said delayed information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, and filter means responsive to said modulating means for selectively applying said second side band to said output terminal.

Claim 54

Apparatus for compensating a frequency modulated information signal reproduced from a record for errors in frequency with the aid of a reference signal simultaneously reproduced from the same record and having proportional errors in frequency, comprising filter means having matched delays for separating said reproduced signals to produce a delayed information signal and a correspondingly delayed reference signal, means for deriving a control signal from said delayed reference signal in which the frequency errors are substantially equal in amplitude to the errors in said information signal, means for modulating said delayed information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, and filter means responsive to said modulating means for selectively applying said second side band to said output terminal.

Claim 55

Apparatus for recording on a second record a frequency modulated information signal having a first center frequency and recorded on a first record simultaneously with a reference signal having a second frequency, comprising reproducing means for simultaneously reproducing said signals from said first record, filter means having matched delays controlled by said reproducing means for separating said reference signal from said information signal while maintaining the time correspondence of said signals, multiplying means controlled by said reproducing means and selectively responsive to said separated and delayed reference signal for multiplying the frequency of said separated and delayed reference signal by the ratio of said first frequency to said second frequency to produce a control signal in which frequency errors due to wow and flutter are approximately equal in amplitude to the errors in said reproduced information signal, means for modulating said separated and delayed information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, means responsive to said modulating means for selectively applying said second side band to said output terminal, oscillator means for producing a second reference signal, and recording means connected to said output terminal and to said oscillator means for simultaneously recording said second side band and said second reference signal on said second record.

Claim 56

Apparatus for recording on a second record a frequency modulated information signal having a first center frequency and recorded on a first record simultaneously with a reference signal having a second frequency, comprising reproducing means for simultaneously reproducing said signals from said first record, filter means having matched delays controlled by said reproducing means for separating said reference signal from said information signal while maintaining the time correspondence of said signals, multiplying means controlled by said reproducing means and selectively responsive to said separated and delayed reference signal for multiplying the frequency of said separated and delayed reference signal by the ratio of said first frequency to said second frequency to produce a control signal in which frequency errors due to wow and flutter are approximately equal in amplitude to the errors in said reproduced information signal, means for modulating said separated and delayed information signal with said control signal to produce a signal comprising a first side band in which the errors are doubled and a second side band in which the errors are cancelled, an output terminal, means responsive to said modulating means for selectively applying said second side band to said output terminal, oscillator means for producing a second reference signal, and recording means connected to said output terminal and to said oscillator means for simultaneously recording said second side band and said second reference signal on said second record.

Claim 57

In a frequency compensation system for recording and reproducing a frequency modulated carrier signal, first means for producing a reference signal at a predetermined frequency, means for recording the modulated carrier signal and said reference signal simultaneously, means for simultaneously reproducing said recorded signals, matched filtering means for separating the reproduced carrier signal and the reproduced reference signal while preserving the time correspondence therebetween, means for modulating one of Said separated signals with a third signal at a fixed frequency to produce a first side band signal, and means for modulating said first side band signal with said other separated signal to produce a second side band signal having a center frequency with a fixed relationship to said predetermined frequency.

Claim 58

In a frequency compensation system for recording and reproducing a frequency modulated carrier signal, first means for producing a reference signal at a predetermined frequency, means for recording the modulated carrier signal and said reference signal simultaneously, means for simultaneously reproducing said recorded signals, matched filtering means for separating the reproduced carrier signal and the reproduced reference signal while preserving the time correspondence therebetween, means for modulating one of Said separated signals with a third signal at a fixed frequency to produce a first side band signal, and means for modulating said first side band signal with said other separated signal to produce a second side band signal having a center frequency with a fixed relationship to said predetermined frequency.

Claim 59

Apparatus for compensating an information signal, comprising an information component modulated on a carrier, for frequency deviations with the aid of a reference signal having analogous frequency deviations, comprising a first signal processing channel selectively responsive to a first of said signals, means in said first channel for combining said first signal with a signal at constant frequency to produce a first control signal containing a frequency component corresponding to said carrier and its frequency deviations and a standoff frequency component, a second signal processing channel selectively responsive to the second of said information and reference signals, means for combining said second signal with said control signal to produce a second control signal at a fixed frequency modulated by said information component, said channels having equal time delays, and means for combining said second control signal with a signal at a fixed frequency to produce an output signal at the frequency of said carrier modulated by said information component.

Claim 60

Apparatus for compensating an information signal, comprising an information component modulated on a carrier, for frequency deviations with the aid of a reference signal having analogous frequency deviations, comprising a first signal processing channel selectively responsive to a first of said signals, means in said first channel for combining said first signal with a signal at constant frequency to produce a first control signal containing a frequency component corresponding to said carrier and its frequency deviations and a standoff frequency component, a second signal processing channel selectively responsive to the second of said information and reference signals, means for combining said second signal with said control signal to produce a second control signal at a fixed frequency modulated by said information component, said channels having equal time delays, and means for combining said second control signal with a signal at a fixed frequency to produce an output signal at the frequency of said carrier modulated by said information component.