| 摘要 |
PURPOSE:To prevent a phase shift between channels L and R of a stereophonic signal by changing data arrangement to two systems of sound PCM signals so that the two channels in each system are in the parallel and in-phase (same time) relation and using two D/A converting means for obtaining a couple of analog outputs by each time division operation to obtain a 4-channel voice output. CONSTITUTION:Serial data of a TV sound are separated into L, R, one of them (L channel) is delayed by 16 bits to obtain L, R simultaneous data. Similarly, a changeover switch 2a and a 16-bit delay circuit 4 form independent audio data ADD as simultaneous data where the channel is separated into an (a) channel (L) and a (b) channel (R). Then one of the two systems, e.g., the independent sound channels (a, b) are delayed by 16 bits each by delay circuits 5, 6, and then 4-channel data is recombined into 2 systems by changeover switches 7a, 7b. Each of the 2-system data combined is converted into an analog signal by D/A converters 8, 9 and the L, R signals of the TV voice are obtained from the converters 8, 9 and no phase shift is caused.
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