Video signal processing apparatus for videotape recorder/reproducer capable of effecting vertical (and horizontal) emphasis and deemphasis on chrominance signals

DETAILED DESCRIPTION In view of the aforesaid problems of the conventional video tape recorder/reproducer, it is an object of the present invention to provide a video signal processing apparatus having a simple circuit arrangement which is capable of effecting vertical emphasis and deemphasis on chrominance signals.
According to the present invention, there is provided a video signal processing apparatus comprising an encoder for converting a chrominance signal into a line sequential signal, time-compressing the line sequential signal and multiplexing the time-compressed line sequential signal with a luminance signal on time compression according to time-division multiplexing, thereby producing a time-division-multiplexed signal, a vertical emphasis circuit connected to an input terminal of the encoder, for effecting vertical nonlinear emphasis on the chrominance signal, and a vertical low-pass filter for removing aliasing distortions from the chrominance signal due to the conversion of the chrominance signal into the line sequential signal, whereby the vertical nonlinear emphasis is effected on the chrominance signal after the chrominance signal has been processed by the vertical low-pass filter.
Since the vertical nonlinear emphasis is effected on the chrominance signal after it has been processed by the vertical low-pass filter that prevents removes aliasing distortions from the chrominance signal due to the line sequential signal conversion, the signal waveform is prevented from being distorted, and the chrominance signal can be recorded and reproduced by a relatively simple circuit arrangement.
The above and other objects, features, and advantages of the present invention will become apparent from the following description of illustrative embodiments thereof to be read in conjunction with the accompanying drawings, in which like reference numerals represent the same or similar objects.