 Replay bit stream searching |
| In an inventive arrangement, an apparatus reproduces a digitally encoded signal from a medium. The ... |
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| Chroma signal phase correction circuitry to be used in a color video information playback system |
| An object of the present invention is therefore to provide a phase correction circuitry for a ... |
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| Method of access to recording medium, and apparatus and method for processing information |
| An object of the present invention is to provide a method of access for a recording medium, which ... |
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| Recording and reading space control between a read/write probe and a recording medium |
| The present invention has been made to solve the above-noted problems and has as its object the ... |
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| Method of digitally compressed video and audio data |
| It is therefore an object of the present invention to provide a data recording system capable of ... |
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| Adapter and adapter system for playback of a compact disc and a mini disc in an optical disc apparatus |
| Accordingly, the present invention has been made in order to solve to the aforementioned problems, ... |
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Video recording and reproducing apparatus with crosstalk reduction
| Details |
Inventors: Ota, Yoshihiko;
Assignee: Victor Company of Japan, Limited (Yokohama, JA)
Primary Examiner: Richardson; Robert L.
Assistant Examiner:
Attorney, Agent or Firm:
A color video signal recording system comprises a frequency modulator for frequency modulating a carrier with a luminance signal separated from an input color video signal. A frequency converter converts a carrier chrominance signal separated from the input color video signal. The separation provides a frequency band which is lower than the band of the frequency modulated luminance signal. Video heads successively record a mixed signal formed by mixing the frequency modulated luminance signal and the frequency converted carrier chrominance signal. Recording is made along a plurality of parallel tracks on a magnetic recording medium. The frequencies f1 and f2 are applied alternately to the frequency converter every time that the video heads scans the tracks. The frequencies f1 and f2 are selected at respective values which satisfy the equation f1 - f2 = (N/2)f.sub.H, where N is an odd integer, and f.sub.H is the horizontal scanning frequency. The frequency of the frequency converted carrier chrominance signal, in the mixed signal recorded in each track, differs by (N/2)f.sub.H from the frequency recorded in an adjacent track. The system for reproducing a color video signal thus recorded comprises video heads for reproducing the signal thus recorded by the above recording system. The reproducing signal includes a demodulator for demodulating the frequency modulated luminance signal which is separated from the reproduced signal. A frequency converter reconverts the frequency converted carrier chrominance signal separated from the reproduced signal, with a signal for causing a different frequency conversion at every scanning of the video heads. The reconverted frequency always becomes the original carrier chrominance signal frequency. A comb filter passes only the normal carrier chrominance signal in the output of the frequency converter and removes the crosstalk components. A mixer mixes the output of the demodulator with the output of the comb filter and obtains a reproduced color video signal. |
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DETAILED DESCRIPTION Referring first to FIGS.
1, 2A and 2B, the first embodiment of the color video signal recording and/or reproducing system according to the present invention will be described.
In the recording system shown in FIG.
1, a color video signal is introduced through an input terminal 11.
Then it is fed to a low-pass filter 12 and a band-pass filter 16, and separated into a luminance signal and a carrier chrominance signal.
The luminance signal has a frequency band of, for example, the order of lower than 3 MHz.
This luminance signal is obtained out of the low-pass filter 12 and is supplied to a frequency modulator 13, where it frequency modulates a carrier wave.
The undesired component of the frequency modulated luminance signal is removed by a high-pass filter 14.
The frequency modulated luminance signal is thereafter supplied to a mixer 15.
The carrier chrominance signal is of a frequency band of the order of 3 MHz to 4 MHz, for example.
It is taken from the output of the band-pass filter 16 and is supplied to a frequency converter 17 where it is frequency converted by a signal from a switching circuit 18.
The conversion is to a frequency band which is lower than the band of the above mentioned frequency modulated luminance signal.
A pulse detector produces a train of pulse signals in synchronization with the rotations of rotating video heads 22a and 22b.
The train of pulse signals is wave shaped at a wave shaper 26 and thereafter supplied to the switching circuit 18 through a terminal 24.
The train of pulse signals comprises a train of signals having voltages which are different in every period during which the rotating video heads 22a and 22b alternately scan each track on the magnetic tape 23, namely, in every one field period.
This switch 18 operates during each period (e.
g.
, each field period) while the video head 22a (22b ) scans substantially one track of a tape 23.
In response to the above mentioned pulse signal, the local oscillators 19 and 20 are changed over, alternately, to supply the output signals thereof to the frequency converter 17
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TV Signal 
