Running-speed control system for magnetic recording medium

Claim 2

A running-speed control system for a magnetic recording medium in which two magnetic heads are disposed at a certain distance from each other, each facing a magnetic recording medium in such a manner as to leave the same traces on said magnetic recording medium, one of said magnetic heads recording a reference signal of a certain frequency on said magnetic recording medium, the other of said magnetic heads successively regenerating said recorded signals, said regenerated signal and said reference signal being phase-compared with each other, a driving mechanism being controlled in accordance with the resulting phase difference, a certain relationship being thereby maintained between the running speed of said magnetic recording medium and the frequency of said reference signal.

Claim 3

A running-speed control system for a magnetic recording medium according to claim 1, in which said reference signal of a certain frequency is a vertical synchronizing signal among video signals to be recorded.

Claim 4

A running-speed control system for a magnetic recording medium comprising a driving mechanism for driving a magnetic recording medium; a rotational phase detector means for producing a signal in accordance with the rotational phase of said driving mechanism; a first phase comparator circuit for detecting a phase difference between a signal from said rotational phase detector means and a first reference signal of a certain frequency; a recording means maintained in contact with said magnetic recording medium for recording a second reference signal of a certain frequency on said magnetic recording medium; a regenerating means for successively regenerating signals recorded by said recording means; a phase comparator circuit for detecting a phase difference between a regenerated signal from said regenerating means and said second reference signal; and a control means for controlling said driving mechanism in accordance with the output of said first and second phase comparator circuits.

Claim 5

A running-speed control system for a magnetic recording medium comprising a driving mechanism for driving a magnetic recording medium; a rotational phase detector means for producing a signal in accordance with the rotational phase of said driving mechanism; a first phase comparator circuit for detecting a phase difference between a signal from said rotational phase detector means and a first reference signal of a certain frequency; a recording means maintained in contact with said magnetic recording medium for recording a second reference signal of a certain frequency on said magnetic recording medium; a regenerating means for successively regenerating signals recorded by said recording means; a phase comparator circuit for detecting a phase difference between a regenerated signal from said regenerating means and said second reference signal; and a control means for controlling said driving mechanism in accordance with the output of said first and second phase comparator circuits.

Claim 6

A running-speed control system for a magnetic recording medium comprising a capstan shaft mechanism for driving a magnetic tape; rotary head means adjacent to said magnetic tape and rotated in synchronism with a standard signal, said rotary head means recording and regenerating a video signal on said recording medium; a first magnetic head for recording a standard signal corresponding to a vertical synchronizing signal in said video signal to be recorded in said magNetic tape in recording said video signal; a second magnetic head for regenerating the recording track of said first magnetic head successively; a first phase comparator circuit for detecting a phase difference between the output of said second magnetic head and said standard signal; a control means for controlling said capstan mechanism by means of the output of said second magnetic head; a third magnetic head for recording said standard signal as a control signal on the recording track of said first magnetic head; a second phase comparator circuit for detecting a phase difference between a regenerated control signal from said third magnetic head and a signal corresponding to the rotational phase of said rotary head means, a first supply means for supplying the output of said second phase comparator circuit to said control means as a control signal; and a second supply means for supplying said regenerated control signal to said rotary head means as a standard signal.

Claim 7

A running-speed control system for a magnetic recording medium comprising a capstan shaft mechanism for driving a magnetic tape; rotary head means adjacent to said magnetic tape and rotated in synchronism with a standard signal, said rotary head means recording and regenerating a video signal on said recording medium; a first magnetic head for recording a standard signal corresponding to a vertical synchronizing signal in said video signal to be recorded in said magNetic tape in recording said video signal; a second magnetic head for regenerating the recording track of said first magnetic head successively; a first phase comparator circuit for detecting a phase difference between the output of said second magnetic head and said standard signal; a control means for controlling said capstan mechanism by means of the output of said second magnetic head; a third magnetic head for recording said standard signal as a control signal on the recording track of said first magnetic head; a second phase comparator circuit for detecting a phase difference between a regenerated control signal from said third magnetic head and a signal corresponding to the rotational phase of said rotary head means, a first supply means for supplying the output of said second phase comparator circuit to said control means as a control signal; and a second supply means for supplying said regenerated control signal to said rotary head means as a standard signal.

Claim 8

A running-speed control system for a magnetic recording medium comprising a capstan shaft mechanism for driving a magnetic tape; rotary head means adjacent to said magnetic tape and rotated in synchronism with a standard signal, said rotary head means recording and regenerating a video signal on said recording medium; a first magnetic head for recording a standard signal corresponding to a vertical synchronizing signal in said video signal to be recorded in said magnetic tape in recording said video signal; a second magnetic head for regenerating the recording track of said first magnetic head successively; a first phase comparator circuit for detecting a phase difference between the output of said second magnetic head and said standard signal; a control means for controlling said capstan mechanism by means of the output of said second magnetic head; a second phase comparator circuit for detecting a phase difference between said standard signal regenerated by said second magnetic head and a signal corresponding to the rotational phase of said rotary head means; a first supply means for supplying the output of said second phase comparator circuit to said control means as a control signal; and a second supply means for supplying said regenerated control signal to said rotary head means as a standard signal.

Claim 9

A running-speed control system for a magnetic recording medium comprising a capstan shaft mechanism for driving a magnetic tape; rotary head means adjacent to said magnetic tape and rotated in synchronism with a standard signal, said rotary head means recording and regenerating a video signal on said recording medium; a first magnetic head for recording a standard signal corresponding to a vertical synchronizing signal in said video signal to be recorded in said magnetic tape in recording said video signal; a second magnetic head for regenerating the recording track of said first magnetic head successively; a first phase comparator circuit for detecting a phase difference between the output of said second magnetic head and said standard signal; a control means for controlling said capstan mechanism by means of the output of said second magnetic head; a second phase comparator circuit for detecting a phase difference between said standard signal regenerated by said second magnetic head and a signal corresponding to the rotational phase of said rotary head means; a first supply means for supplying the output of said second phase comparator circuit to said control means as a control signal; and a second supply means for supplying said regenerated control signal to said rotary head means as a standard signal.