Abstract: A recording/reproducing apparatus or a reproducing apparatus has a first, a second and a third magnetic heads. The first and second magnetic heads have different gap azimuth angles and are spaced 180 degrees apart from each other on a rotary head. The third magnetic head has the same gap azimuth angle as that of the second magnetic head and a specific relative positional relationship with the first magnetic head on the rotary head. Recording of each frame signal of a video signal is controlled as follows: The frame signal is divided into N (N being a integer of two or more) slant tracks on a magnetic tape at a standard tape speed in a standard mode; the frame signal is divided into N/2 slant tracks at a tape speed ½ of the standard speed in ½ speed mode; or the frame signal is divided into N/2 slant tracks at a tape speed ⅓ of the standard speed in ⅓ speed mode.

Abstract: A video tape recorder has a drum for winding a magnetic tape therearound, a capstan motor and a drum motor linked with the drum, both motors for traveling the magnetic tape, and two rotary magnetic heads arranged adjacent to each other relative to the magnetic tape and having two different azimuth angles. One reproduced signal of higher signal level is selected from two modulated signals reproduced by the two magnetic heads to output a detected reproduced signal. Sampling signals are generated each having a signal level corresponding to a signal level of the detected reproduced signal on the basis of the reproduced signal obtained by the selected magnetic head, only during a period while a predetermined one of the two magnetic heads is being selected in response to a head select signal, at each of time intervals obtained by dividing one vertical scanning period into a two or more natural number N.

Abstract: A helical scan type playback apparatus comprising a plurality of magnetic heads, a position signal generation element for generating a signal indicative of each position of these magnetic heads, and a switching element for video signals played back by the plurality of magnetic heads in response to the position signal from the generation element, particularly a playback apparatus for information recorded on a video tape in which the phase of a low frequency band color signal is altered every track of a video tape on the basis of a predetermined rule, thereby allowing spectra of color signals not to overlap with each other between adjacent tracks.

Abstract: A helical scan type playback apparatus comprising a plurality of magnetic heads, a position signal generation element for generating a signal indicative of each position of these magnetic heads, and a switching element for video signals played back by the plurality of magnetic heads in response to the position signal from the generation element, particularly a playback apparatus for information recorded on a video tape in which the phase of a low frequency band color signal is altered every track of a video tape on the basis of a predetermined rule, thereby allowing spectra of color signals not to overlap with each other between adjacent tracks.

Abstract: A control pulse recording circuit for a magnetic recording and reproducing apparatus having standard and expanded play modes, comprising an oscillator for generating a predetermined signal having a predetermined frequency which is higher than that of the vertical synchronizing signal of a video signal; a counter for counting the predetermined signal to produce a 30 Hz signal when a counted value in the counter reaches a threshold value with a timing which has been delayed by a predetermined time from every other vertical synchronizing signal in a recording mode; a circuit supplied with the 30 Hz signal for producing 30 Hz pulses; and control head circuitry for recording the 30 Hz pulses on a magnetic tape in the recording mode. The 30 Hz pulses are recorded on the magnetic tape with a timing delayed by a delay time from a timing of every other vertical synchronizing signal in both the standard and expanded play modes.

Abstract: A pseudo vertical synchronizing signal producing circuit produces a pseudo vertical synchronizing signal which is used instead of a regular vertical synchronizing signal of a video signal during a special reproduction mode of a helical scan type magnetic recording and/or reproducing apparatus. The pseudo vertical synchronizing signal producing circuit effectively utilizes a counter circuit for producing a pulse when a counted value therein reaches predetermined threshold values set therein, and employs a minimum number of monostable multivibrators and external variable resistors coupled thereto, so that the circuit can easily be manufactured in the form of an integrated circuit.

Abstract: A drum servo circuit for a magnetic recording and/or reproducing apparatus uses a 30 Hz or 60 Hz oscillator circuit (counter), and a trapezoidal wave signal (or a sampling pulse signal) is produced by selectively using threshold values set in the oscillator circuit depending on the play mode, so as to eliminate the need to externally couple a plurality of variable resistors to a monostable multivibrator. A drum motor which drives a rotary drum is controlled responsive to a phase error signal which is obtained by comparing the phase of the trapezoidal wave signal (or the sampling pulse signal) and the phase of a rotation detection signal which is obtained by detecting the rotation of the drum motor.

Abstract: A back-space editing control circuit comprises a sampling signal producing circuit for producing a sampling signal from a control signal reproduced from a magnetic tape in an assembly state and for producing a sampling signal from a capstan motor rotation detection signal in a recording state, a trapezoidal wave signal producing circuit for producing a trapezoidal wave signal from a signal based on a synchronizing signal in the assembly state and for producing a trapezoidal wave signal from the rotation detection signal in the recording state, and a driving and control circuit for sampling the trapezoidal wave signal from the trapezoidal wave signal producing circuit by the sampling signal from the sampling signal producing circuit and for driving and controlling a rotational phase of a capstan motor by use of a sampled signal.

Abstract: A control signal generating circuit for a magnetic recording and/or reproducing apparatus comprises a monostable multivibrator for producing a pulse signal having a predetermined pulse width in response to a reference signal from a supplying circuit of the recording and/or reproducing apparatus, a flip-flop circuit responsive to the output pulse signal of the monostable multivibrator, for inverting an output thereof every time the pulse signal is supplied thereto, and an OR gate for producing a control signal responsive to the output pulse signal of the monostable multivibrator and the output of the flip-flop circuit, and for supplying the control signal to a control head, of the recording and/or reproducing apparatus, which records and/or reproduces the control signal on and/or from a magnetic tape.

Abstract: A video signal reproducing apparatus capable of performing high-speed reproduction comprises a reproducing circuit having at least one rotary video head for scanning over a tape recorded with a video signal on tracks formed obliquely with respect to the longitudinal direction of the tape and a control pulse recorded on a track formed along the longitudinal direction of the tape, for reproducing the video signal from the oblique tracks, a tape driving circuit for causing the tape travel at a speed higher than a tape speed upon normal reproduction during high-speed reproduction, a motor controlled of its rotation, a motor speed detecting circuit for detecting the rotational speed of the motor and producing a rotation detection signal having a repetition frequency in accordance with the detected rotational speed, an input switching circuit for supplying a signal reproduced from the tape to a frequency-voltage converter upon high-speed reproduction, where the frequency-voltage converter is supplied with the rotat

Abstract: A D.C. motor driving circuit comprises a first transistor circuit comprising an initial stage transistor and a terminal stage transistor respectively connected in Darlington pairs, for supplying a current to a D.C. motor, coupled between the D.C. motor and a power source, a switching transistor coupled to the initial stage transistor of the first transistor circuit, and a second transistor circuit including a transistor coupled in parallel to the first transistor circuit, for supplying a current to the D.C. motor. The switching transistor is turned ON when applied with a driving signal voltage to put the first transistor circuit in an ON state. The current supplied to the D.C. motor decreases as a rotational speed thereof increases after starting of the D.C. motor. The first transistor circuit is turned OFF when the rotational speed of the D.C. motor reaches a speed near its constant normal rotational speed. The D.C.

Abstract: A video signal reproducing system performs a still-picture reproduction or a slow-motion reproduction. A reproducing circuit picks up a recorded video signal and control signal which are fed to a reproducing circuit. A control head of the reproducing circuit is located at a position which is displaced from a standard position by a predetermined distance. The control signal which is reproduced by the control head is displayed by a delay time corresponding to the distance by which the control head is displaced from a standard position.

Abstract: A video signal recording and reproducing apparatus records and reproduces a video signal on and from a magnetic tape, by selecting an arbitrary recording and reproducing mode from among a plurality of recording and reproducing modes in which tape traveling speed and track pitch differ, and by selecting a plurality of pairs of video heads.

Abstract: A video signal reproducing apparatus uses a tape on which a video signal has been recorded along tracks disposed obliquely relative to the tape longitudinal direction. The tracks are mutually contiguous, with substantially no space therebetween. The tracks are recorded and formed by a pair of first and second rotating heads having gaps of mutually different azimuth angles. A control signal is also recorded interrelatedly with the start of the formation of each recording track by the first rotating head. A pair of first and second rotating heads have the same mutually different azimuth angles as the first mentioned first and second rotating heads and also have gaps at different height positions in the rotational planes relative to the centers of the track widths. These heads scan the tracks of the tape to reproduce the video signal.