Speed detection and control

Claim 1

A method for controlling the transfer speed of a body of a magnetic recording medium driven by driving means comprising the steps of bringing a first and a second magnetic head into contact with a body of a magnetic recording medium at a predetermined distance between the first and the second heads, said body being driven by driving means and said first head being disposed before said second head with respect to the transfer of said body of recording medium, recording pulse signals of the output of an oscillator through said first magnetic head, reproducing said recorded signals by said second magnetic head disposed after said first magnetic head, successively recording pulse signals in said recording medium by synchronously oscillating said oscillator with said reproduced signals, comparing the phases of a signal related with said reproduced signals and an external reference signal to derive the phase difference signal and controlling said driving means with said phase difference signal.

Claim 2

A method for controlling the transfer speed of a body of a magnetic recording medium driven by driving means comprising the steps of bringing a first and a second magnetic head into contact with a body of a magnetic recording medium at a predetermined distance between the first and the second heads, said body being driven by driving means and said first head being disposed before said second head with respect to the transfer of said body of recording medium, recording pulse signals of the output of an oscillator through said first magnetic head, reproducing said recorded signals by said second magnetic head disposed after said first magnetic head, successively recording pulse signals in said recording medium by synchronously oscillating said oscillator with said reproduced signals, comparing the phases of a signal related with said reproduced signals and an external reference signal to derive the phase difference signal and controlling said driving means with said phase difference signal.

Claim 5

A method for controlling the speed of a magnetic disk of a magnetic disk type magnetic video reproducer apparatus in recording video signals for one field of television signal according to an interlaced scanning system having a vertical synchronizing signal of frequency fv Hz and a horizontal synchronizing signal of frequency fH Hz and a horizontal synchronizing signal of frequency fH Hz in a magnetic disk rotated by driving means with a stationary head, comprising the steps of recording the oscillation output of an oscillator with a first magnetic head in a rotating body of magnetic medium rotated in relation with said magnetic disk, reproducing the recorded signal of said output with a second magnetic head at a position spaced from said first magnetic head by

Claim 6

A method for controlling the speed of a magnetic disk of a magnetic disk type magnetic video reproducer apparatus in recording video signals for one field of television signal according to an interlaced scanning system having a vertical synchronizing signal of frequency fv Hz and a horizontal synchronizing signal of frequency fH Hz and a horizontal synchronizing signal of frequency fH Hz in a magnetic disk rotated by driving means with a stationary head, comprising the steps of recording the oscillation output of an oscillator with a first magnetic head in a rotating body of magnetic medium rotated in relation with said magnetic disk, reproducing the recorded signal of said output with a second magnetic head at a position spaced from said first magnetic head by

Claim 7

A method of controlling tape speed in a magnetic video recording and reproduction apparatus, comprising the steps of: a. controlling a tape driving means during the recording of a television signal, including the steps of: driving a magnetic tape past first and second magnetic head means spaced apart a predetermined distance from each other, recording output signals from a self-oscillator onto a recording track of said magnetic tape through said first magnetic head means, reproducing said recorded output signals from said magnetic tape by said second magnetic head means, triggering said self-oscillator with said signals reproduced By said second magnetic head means, comparing the phase of a signal relating to the vertical synchronizing signal component of said television signal with the phase of the output signal of said self-oscillator by a first phase comparator, and controlling said tape driving means by a signal corresponding to the phase difference obtained from said first phase comparator; b. controlling a rotating head driving means during said recording, including the steps of: recording a saturating control signal related to said vertical synchronizing signal onto said recording track after said recorded output signals have been reproduced by said second magnetic head means, comparing the phase of a signal corresponding to the rotation rate of a rotating head with the phase of a signal relating to said vertical synchronizing signal by a second phase comparator, and controlling said rotating head driving means by a signal corresponding to the phase difference obtained from said second comparator; and c. controlling said tape driving means during the reproduction of the television signal recorded on said magnetic tape, including the steps of: comparing the phase of said control signal with the phase of the signal corresponding to the rotation rate of said rotating head by said first phase comparator, and controlling said tape driving means by a signal corresponding to the phase difference obtained from said first comparator.

Claim 8

A method of controlling tape speed in a magnetic video recording and reproduction apparatus, comprising the steps of: a. controlling a tape driving means during the recording of a television signal, including the steps of: driving a magnetic tape past first and second magnetic head means spaced apart a predetermined distance from each other, recording output signals from a self-oscillator onto a recording track of said magnetic tape through said first magnetic head means, reproducing said recorded output signals from said magnetic tape by said second magnetic head means, triggering said self-oscillator with said signals reproduced By said second magnetic head means, comparing the phase of a signal relating to the vertical synchronizing signal component of said television signal with the phase of the output signal of said self-oscillator by a first phase comparator, and controlling said tape driving means by a signal corresponding to the phase difference obtained from said first phase comparator; b. controlling a rotating head driving means during said recording, including the steps of: recording a saturating control signal related to said vertical synchronizing signal onto said recording track after said recorded output signals have been reproduced by said second magnetic head means, comparing the phase of a signal corresponding to the rotation rate of a rotating head with the phase of a signal relating to said vertical synchronizing signal by a second phase comparator, and controlling said rotating head driving means by a signal corresponding to the phase difference obtained from said second comparator; and c. controlling said tape driving means during the reproduction of the television signal recorded on said magnetic tape, including the steps of: comparing the phase of said control signal with the phase of the signal corresponding to the rotation rate of said rotating head by said first phase comparator, and controlling said tape driving means by a signal corresponding to the phase difference obtained from said first comparator.

Claim 9

A method of controlling tape speed in a magnetic video recording and reproducing apparatus, comprising the steps of: a. controlling a tape driving means during the recording of a television signal, including the steps of: driving a magnetic tape past first and second magnetic head means spaced apart a predetermined distance from each other, recording output signals from a self-oscillator onto a recording track of said magnetic tape through said first magnetic head means, reproducing said recorded output signals from said magnetic tape by said second magnetic head means, triggering said self-oscillator with said signals reproduced by said second magnetic head means, comparing the phase of a signal relating to the vertical synchronizing signal component of said television signal with the phase of the output signal of said self-oscillator by a first phase comparator, and controlling said tape driving means by a signal corresponding to the phase difference obtained from said first phase comparator; b. controlling a rotating head driving means during the recording of said television signal, including the steps of: comparing the phase of a signal corresponding to the rotation rate of said rotating head driving means with the phase of said signal relating to the vertical synchronizing signal by a second phase comparator, controlling said rotating head driving means by a signal corresponding to the phase difference obtained through said second phase comparator; and c. controlling said tape driving means during the reproduction of the television signal recorded on said magnetic tape, including the steps of: comparing a signal corresponding to the output signal of said self-oscillator and a signal corresponding to the rotating rate of said rotating head, said output of said self-oscillator being related to the reproduced output of said second magnetic head means, and controlling said tape driving means by a further signal corresponding to the phase differences obtained from said first phase comparator.

Claim 10

A method of controlling tape speed in a magnetic video recording and reproducing apparatus, comprising the steps of: a. controlling a tape driving means during the recording of a television signal, including the steps of: driving a magnetic tape past first and second magnetic head means spaced apart a predetermined distance from each other, recording output signals from a self-oscillator onto a recording track of said magnetic tape through said first magnetic head means, reproducing said recorded output signals from said magnetic tape by said second magnetic head means, triggering said self-oscillator with said signals reproduced by said second magnetic head means, comparing the phase of a signal relating to the vertical synchronizing signal component of said television signal with the phase of the output signal of said self-oscillator by a first phase comparator, and controlling said tape driving means by a signal corresponding to the phase difference obtained from said first phase comparator; b. controlling a rotating head driving means during the recording of said television signal, including the steps of: comparing the phase of a signal corresponding to the rotation rate of said rotating head driving means with the phase of said signal relating to the vertical synchronizing signal by a second phase comparator, controlling said rotating head driving means by a signal corresponding to the phase difference obtained through said second phase comparator; and c. controlling said tape driving means during the reproduction of the television signal recorded on said magnetic tape, including the steps of: comparing a signal corresponding to the output signal of said self-oscillator and a signal corresponding to the rotating rate of said rotating head, said output of said self-oscillator being related to the reproduced output of said second magnetic head means, and controlling said tape driving means by a further signal corresponding to the phase differences obtained from said first phase comparator.

Claim 11

A method of controlling tape speed in a magnetic video recording and reproducing system, comprising the steps of: driving a magnetic recording medium past first and second magnetic head means spaced apart from each other a predetermined distance; generating an output signal from an oscillator having the characteristics of an astable multi-vibrator; applying said oscillator output signal to said magnetic recording medium through said first magneTic head means; reproducing said recorded output signal by said second magnetic head means; applying said reproduced output signal to the input of said oscillator, thereby controlling the frequency of oscillation of said oscillator; applying a signal corresponding to said reproduced output signal to a phase comparator; applying, in a record mode, a signal corresponding to the vertical synchronizing signal component of a television signal being recorded on said magnetic recording medium to said phase comparator; applying the thus obtained first phase difference signal output of said phase comparator to magnetic recording medium driving means; and controlling the speed at which said magnetic recording medium is driven past said first and second magnetic head means by said first phase difference signal.

Claim 12

A method of controlling tape speed in a magnetic video recording and reproducing system, comprising the steps of: driving a magnetic recording medium past first and second magnetic head means spaced apart from each other a predetermined distance; generating an output signal from an oscillator having the characteristics of an astable multi-vibrator; applying said oscillator output signal to said magnetic recording medium through said first magneTic head means; reproducing said recorded output signal by said second magnetic head means; applying said reproduced output signal to the input of said oscillator, thereby controlling the frequency of oscillation of said oscillator; applying a signal corresponding to said reproduced output signal to a phase comparator; applying, in a record mode, a signal corresponding to the vertical synchronizing signal component of a television signal being recorded on said magnetic recording medium to said phase comparator; applying the thus obtained first phase difference signal output of said phase comparator to magnetic recording medium driving means; and controlling the speed at which said magnetic recording medium is driven past said first and second magnetic head means by said first phase difference signal.