| 摘要 |
PURPOSE:To eliminate or attenuate the mixture of noise due to scratches present on the surface of a recording disc, by obtaining a main output and an auxiliary output from a reproducing cartridge and interrupting or attenuating the passing of signal of the main output by means of the auxiliary output taken as a trigger. CONSTITUTION:The recording vibration from a reproducing cartridge 1 is obtained in the main output 1a as an electric signal. A speaker 5 or a recorder 6 is operated through an amplifier 2, a signal gate 3, and an amplifier 4. On other hand, in the auxiliary output 1b, the vibration different from the recording vibration is obtained as an electric signal. A pulsive noise present in this auxiliary output exceeding a background noise and a crosstalk component is a control signal at a rectifier 8 through an amplifier 7. This control signal is used as a trigger signal to control the gate 3, allowing to eliminate the pulsive noise. |
