| 摘要 |
PURPOSE:To obtain a reproduced sound signal containing a continuous waveform despite a phase shift detected between demodulated sound signals by extracting with switching two demodulated sound signals of the outputs of two frequency demodulation circuits. CONSTITUTION:Switch circuits 70L and 70R function as adder circuits which can vary the ratio of addition. The reproduced sound signals L and R of the outputs of those adder circuits are shown as L=XLA+(1-X)LB and R=XRA+(1- X)RB respectively, where the addition ratios of sound signals LA/RA and LB/ RB are set at X and 1-X respectively. In this case, X varies continuously from 1 through 0 in a period TAB and then from 0 through 1 in a period TBA respectively. In such a way, the continuous waveforms are obtained for reproduced sound signals L and R of the outputs of circuits 70L and 70R even though a phase shift is produced between signals LA and LB as well as RA and RB. |
