| 摘要 |
An IF signal filter in the IF sound channel of a television receiver exhibits peak amplitude responses which are unsymmetrical and slightly offset from the nominal picture and sound carrier frequencies by an amount dictated by the amount of tilt introduced by the tuner and the IF signal processing section. As a result, a filtered IF signal applied to a sound demodulating system exhibits a substantially symmetrical characteristic with respect to both the sound and picture carrier frequencies, yielding reduced audio buzz and harmonic distortion. |
