Multiplex method for digital transmission of stereo sound signals via devices of the standardised PCM hierarchy

摘要

In order to be able to transmit up to two digital multiplex signals DS1 and DS1' in each case at a bit rate of 992 kbit/s, in each case containing a high-quality digitised and error-protected stereo sound signal with associated additional information and their own frame alignment words, via a DSV2 (formerly PCM30), the odd-numbered time channels 1, 3, ..., 31 are occupied according to the invention with the first multiplex signal DS1 and the even-numbered time channels 2, 4, ..., 30 are occupied with the second multiplex signal DS1', the first multiplex signal DS1 occupying only 6 bits in the time channels 1 and 31 and the second multiplex signal DS1' also occupying the respective remaining 2 bits in these time channels 1 and 31. Instead of the second multiplex signal DS1', 14 telephony channels can be transmitted in the even-numbered channels 2, 4, ..., 14, 18, 20, ..., 30 and the signalling channel which is then required can be transmitted in time channel 16. A freely available bit within the service words of the DSV2 carries, as the clock alignment bit, the clock alignment type of the positive-zero-negative clock alignment method used here (Fig. 2). IMAGE