| 摘要 |
An improved chrominance signal playback system and method for a video cassette recorder are disclosed. A radio frequency of composite video signal detected by a video head is applied to a low-pass filter which filters the composite video signal and outputs a low frequency of chrominance signal. The chrominance signal from the low-pass filter is automatically gain-controlled and is demodulated. The demodulated chrominance signal is applied to a color killer circuit. Also, an envelope detector detects an envelope signal from the chrominance signal from the low-pass filter. In response to the envelope signal, an attenuator attenuates the level of the chrominance signal from the color killer circuit. This results in the suppression of white noise in the chrominance signal. Therefore, the signal-to-noise ratio and the accompanying image quality can be enhanced.
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