| 摘要 |
<p>Circuitry included in a TV receiver for enhancing the signal-to-noise ratio of the chrominance signal includes an adaptive linear phase, low pass filter which has its bandwidth controlled responsive to the frequency components of the chrominance signal. A frequency analyzer is coupled to the low pass filter. The frequency analyzer periodically reprograms the filter in response to the chrominance signal so as to maintain the passband of the filter at a relative minimum to pass the chrominance signal.</p> |
