| 摘要 |
PURPOSE:To easily fetch L sound signal and R sound signal, by time division composing the main sound signal and auxiliary sound signal and outputting the combined signal through an integrating circuit. CONSTITUTION:A signal having the waveform shown in fig. (c) is obtained when the main sound signal component and auxiliary sound signal component are alternately extracted and composed (added) together, by time dividing the main sound signal (L+R) shown in fig. (a) and the auxiliary sound signal (L-R) with a pulse having a duty ratio of 1/2. The combined signal shown in fig. (c) is sent to a sound amplifier circuit of the L channel as an L sound signal which corresponds to the original L sound signal after the ripple component is removed from the combined signal by an integrating circuit 4. Moreover, the circuit for the R channel is constituted so that an auxiliary sound signal [-(L-R)] which is inverted in phase is added to the input terminal 2 of the auxiliary sound signal when the R sound signal is to be obtained. |
