| 摘要 |
In a video disc player intermodulation distortion can occur during signal recovery and is manifested as the modulated sound carrier appearing in the baseband video. To reduce such distortion, a portion of the signal recovered from the disc record is filtered to extract the modulated sound carrier. This signal is applied to a phase shifting circuit having a predetermined frequency response to condition the modulated sound carrier to have a phase characteristic substantially similar to the phase response of the modulated sound carrier appearing as distortion in the baseband video. The phase conditioned sound carrier is then amplitude adjusted and linearly subtracted from the baseband video signal.
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