| 摘要 |
PURPOSE:To make high performance and high reliability compatible by applying a timing signal whose transmission characteristic is changed in a simulated sinusoidal wave way at a period of 38kHz to a multi-channel input analog switch. CONSTITUTION:A resistance attenuator 3 constitutes an attenuator of variable attenuation in combination with a multi-channel analog switch 5 and an analog moltiplier whose transmission characteristic is a simulated sinusoidal wave is constituted by giving a signal from a timing decoder 14 so that the channel of the analog switch is switched sequentially, and a modulated sound signal is given to a resistor 9 via a buffer 7 to obtain a modulation signal to the left channel sound. Similarly, the modulation signal to the right round channel is obtained by using a resistance attenuator 4, a multi-channel analog switch 6 and the timing decoder 14 and fed to a series circuit comprising resistors 9, 10. |
