Abstract: The present invention is applied to recording/reproducing apparatus such as a video tape recorder or video signal transmitting apparatus which comprises an decoder (36) and an encoder (16), and is arranged to separate luminance and two chrominance signal components from a composite video signal, to transmit an information signal indicative of the phase of chrominance subcarrier within the composite video signal on decoding; and to control the phase relationship between the composite video signal and chrominance subcarrier during encoding on the basis of the information signal thereby removing or minimizing distortion in high frequency range of the luminance signal and the chrominance signal.

Abstract: A synchronization signal generator for NTSC, PAL or PALM system, capable of synchronizing by external signal; wherein horizontal information signal of external synchronization signal is processed through a stabilization circuit, and its output is frequency-divided by a counter, and then only such horizontal scanning information parts that makes phase relation of the horizontal synchronization signal and the color sub-carrier to a predetermined relation is extracted, and by resetting the counter based on the extracted information, to obtain SCH phase regulated signal.

Abstract: A system for recording and reproducing three component signals configuring the video signal is equipped with a first synchronizing signal generator used to generate a burst signal to be added to a luminance signal and a color component signal during recording and reproduction and the read clock used for the memory to correct the time base of the reproduced component signal and a second synchronizing signal generator used to generate the synchronizing signal to be added to the composite video signal.

Abstract: A recording and reproducing apparatus for recording a video signal carrying a horizontal sync signal multiplexed with at least one another video signal into a serial mixed signal by compression along the time axis, or for recording such a signal without any compression along the time axis, wherein a pilot signal of a single frequency is superimposed in the horizontal blanking period of at least one video signal, and a clock is generated by use of the pilot signal of the mixed signal at the time of reproduction, thus eliminating time-axis variations appearing through recording and reproduction.

Abstract: A portable video tape recorder for broadcasting applications comprises a pair of video heads mounted diametrically opposite to each other on the circumference of a rotary cylinder. High and low frequency carriers are modulated by frequency modulators with I and Q signals, respectively, and frequency division multiplexed for application to the video heads. The frequency values of the carriers are selected so that third-order distortion noise caused by the hysteresis characteristics of the video heads and the magnetic tape may fall within a frequency range differing from the frequencies of the modulated carriers by an amount greater than the bandwidth of the I and Q signals which are demodulated by frequency demodulators to prevent the occurrence of beat interference in the frequency band of the reproduced video signal.

Abstract: In a video tape recorder, luminance and chrominance signals are recorded respectively by first and second transducer heads along separate tracks skewed to the direction of tape motion. The transducer heads are rotated during particular modes such as slow-motion or still picture reproduction, in a tape-head speed relationship different from the normal tape-head speed relationship, causing the transducer heads to traverse several tracks. A switching circuit is coupled to the transducer heads to selectively connect the outputs of the heads to an output circuit in response to a point of transition of amplitude of the output signal from the second head to cancel unwanted signal components detected by the heads during traversal across the tracks.

Abstract: Luminance and chrominance signals, which are interleaved with respective synchronization signals, are recorded through the use of two video transducer heads alternately in skewed separate tracks of a recording tape. Upon reproduction, the timing signals are separated from the luminance and chrominance signals and compared in phase between them to detect the phase difference between the luminance and chrominance signals. A variable delay line is provided to introduce a variable delay interval as a function of the detected phase difference to the one of the signals which is advanced in phase relative to the other. The time axis deviation of the video signal from a standard phase is also detected by a comparison between the time base, or horizontal sync pulse, and a reference time base to introduce a delay time to both the luminance and chrominance signals.

Abstract: In a system for cancelling time axis variations introduced into a frequency converted chrominance signal converted into a lower frequency range in the recording and reproduction of a color television signal with a small-size video tape recorder, in which system the cancellation of the time axis variations is effected by using a continuous reference signal obtained through an APC heterodyne system, the center frequency of oscillation of an APC oscillator is made n/m times the subcarrier frequency f.sub.s of the lower frequency converted chrominance signal (m and n being integers and n>m), and the reproduced frequency converted chrominance signal is heterodyned with a signal obtained by heterodyning a continuous signal obtained by dividing the frequency of the output signal of the oscillator by n/m in the presence of a steady reference signal at the same frequency as the standard color sub-carrier frequency to thereby obtain the cancellation of the time axis variations.