| 摘要 |
PURPOSE:To obtain a stable reproduced sound even when a defect or noise superposition is generated in a receiving signal from one of two speaker systems in a spatial light transmitting speaker system. CONSTITUTION:An optical signal converted from the time-division multiplexed result of digital signals from two channels is transmitted to two speaker systems 1a, 1b. Each of the speaker systems 1a, 1b extracts an audio signal from a received signal and judges the existence of an error. Both the speakers are constituted so as to mutually exchange extracted audio signals, and if an error exists in the audio signal exacted by one of the two speakers, the normal signal received by the other speaker system is reproduced. Clocks to be supplied to a digital filter and a D/A converter are formed by a PLL circuit 57 and a reference clock supplied from the speaker system receiving an errorless signal is selectively inputted to the PLL circuit 57 as an input signal. |
