| 摘要 |
PURPOSE:To improve the sound peformance and at the same time to educe the breakdown of sound signals by setting a holding section synchronously with a head switch signal and controlling repetitively holding and charging of a sampling/holding circuit with the output of an oscillation circuit which has oscillations just for said holding section. CONSTITUTION:A holding pulse g2 generated from a setting circuit 14 30Hz synchronizing hold section is supplied to a synchronizing oscillation circuit 15. Then an oscillation pulse g3 having smaller width than the pulse g2 is delivered just for a holding section and supplied to a sampling/holding circuit 12. The detection output e1 of the sound delivered from a detector repeats holding and charging by a control signal and is turned into a reproduction signal waveform shown by f2 in the figure. In other words, the fine holding and charging are given to a noise generating section in addition to the total holding. Thus, the breakdown of sound signals is reduced as well as the impulsive noise. |
