A video tape reproducer system having automatic standard selection

Claim 3

In a video recorder-reproducer system having means for playing back information which has been recorded in frequency modulated form according to one of a plurality of frequency modulation deviation standards, said playback means including individual portions each of which is effective in playing back information recorded according to a different one of said standards, the combination comprising: means for determining the frequency of a given portion of said frequency modulated signal; and means coupled to said frequency determining means for causing a particular one of said playback portions to be active in playing back said information.

Claim 4

In a video recorder-reproducer system having means for playing back information which has been recorded in frequency modulated form according to one of a plurality of frequency modulation deviation standards, said playback means including individual portions each of which is effective in playing back information recorded according to a different one of said standards, the combination comprising: means for determining the frequency of a given portion of said frequency modulated signal; and means coupled to said frequency determining means for causing a particular one of said playback portions to be active in playing back said information.

Claim 5

In a video recorder-reproducer system having means for playing back video information recorded in the form of a frequency modulated signal according to one of a plurality of frequency modulation deviation standards, said playback means including individually selectable portions each of which is effective in playing back information recorded according to a different one of said standards, the combination comprising: means for separating a desired portion of said frequency modulated signal; means for comparing the frequency of said separated signal to a given frequency to provide an indication of the frequency difference between said signals; and means responsive to said indicated frequency difference for controlling the selection of a certain one of said playback portions for playing back said information. 4 The combination according to claim 3, wherein said first means includes: means responsive to said frequency modulated signal for demodulating said frequency modulated signal; means responsive to said demodulated signal for generating a control signal corresponding in time with a particular portion of said frequency modulated signal; and gating means responsive to said frequency modulated signal for isolating a portion of said frequency modulated signal in response to said control signal.

Claim 6

The combination according to claim 3, wherein said second means includes: frequency generating means for providing a signal of a given frequency; and frequency difference detecting means coupled to said frequency generating means and said signal separating means for providing an output indicative of a frequency difference if any between said input signals.

Claim 7

In combination; a video recorder-reproducer device operable to transduce composite video signal information in frequency modulation form according to predetermined frequency deviation standards, said composite video information including horizontal synchronizing pulses having a trailing edge reference level, the playback means of said recorder-reproducer device having individual selectable portions, each of said portions being suitable for playing back said video information according to a different one of said frequency deviation standards, a demodulator responsive to said video information in frequency modulated form for providing said information in demodulated signal form, means coupled to said demodulator for separating the horizontal synchronizing signal portion of said demodulated signal, means responsive to said separated signal for generating a gate control signal which is present during the reference level portion of said composite video signal information, gating means coupled to said video signal in frequency modulated form and responsive to said gate control signal for separating the portion of said frequency modulated video signal representing said reference level, an oscillator for providing a signal of a given frequency, frequency difference detecting means coupled to said gating means and said oscillator to provide an output indicative of a frequency difference if any between said oscillator frequency and the frequency of said reference level, logic means coupled to the output of said frequency difference detecting means for providing a selection control signal in accordance with the detection of the frequency of said reference level as representing a particular one of said frequency deviation standards, and means responsive to said selection control signal for causing a particular playback portion of said device to be active in playing back said video information.

Claim 8

In combination; a video recorder-reproducer device operable to transduce composite video signal information in frequency modulation form according to predetermined frequency deviation standards, said composite video information including horizontal synchronizing pulses having a trailing edge reference level, the playback means of said recorder-reproducer device having individual selectable portions, each of said portions being suitable for playing back said video information according to a different one of said frequency deviation standards, a demodulator responsive to said video information in frequency modulated form for providing said information in demodulated signal form, means coupled to said demodulator for separating the horizontal synchronizing signal portion of said demodulated signal, means responsive to said separated signal for generating a gate control signal which is present during the reference level portion of said composite video signal information, gating means coupled to said video signal in frequency modulated form and responsive to said gate control signal for separating the portion of said frequency modulated video signal representing said reference level, an oscillator for providing a signal of a given frequency, frequency difference detecting means coupled to said gating means and said oscillator to provide an output indicative of a frequency difference if any between said oscillator frequency and the frequency of said reference level, logic means coupled to the output of said frequency difference detecting means for providing a selection control signal in accordance with the detection of the frequency of said reference level as representing a particular one of said frequency deviation standards, and means responsive to said selection control signal for causing a particular playback portion of said device to be active in playing back said video information.

Claim 9

In a video recorder-reproducer system operable to transduce composite video signal information in frequency modulation form according to any one of several predetermined frequency deviation standards, said system including record and playback means each of which have individual selectable portions, each of said portions being suitable in transducing said video information according to a different one of said frequency deviation standards, the combination comprising: means responsive to said video information recorded in frequency modulated form for providing an output indicative of a frequency difference if any between the frequency of a particular portion of said frequency modulated information and a given frequency; logic means responsive to the output of said last means for proViding a control signal in accordance with the detection of the frequency of the particular portion of said recorded signal as representing a particular one of said frequency deviation standards; and means responsive to said control signal for causing a particular record portion of said system to be active when next recording video information.

Claim 10

In a video recorder-reproducer system operable to transduce composite video signal information in frequency modulation form according to any one of several predetermined frequency deviation standards, said system including record and playback means each of which have individual selectable portions, each of said portions being suitable in transducing said video information according to a different one of said frequency deviation standards, the combination comprising: means responsive to said video information recorded in frequency modulated form for providing an output indicative of a frequency difference if any between the frequency of a particular portion of said frequency modulated information and a given frequency; logic means responsive to the output of said last means for proViding a control signal in accordance with the detection of the frequency of the particular portion of said recorded signal as representing a particular one of said frequency deviation standards; and means responsive to said control signal for causing a particular record portion of said system to be active when next recording video information.

Claim 11

The combination according to claim 7, wherein: said logic means are of the type which can continuously provide a control signal representative of last sensed particular one of said frequency deviation standards being utilized in the absence of an output from said first mentioned means.

Claim 12

The combination according to claim 7, and further including: a signal generator for generating control signals corresponding to each of the frequency deviations standard operation conditions; and switching means coupled to said logic means and said third means, said switching means being operable in a first condition to couple the control signal from said logic means to said third means and operable in a second condition to couple the control signals from said signal generator to said third means.