| 摘要 |
A digital signal multiplex device has at least one multiplexer and at least one demultiplexer for pulse frames having a number of useful information channels. The transmitter has a data protection coder and the receiver has a data protection decoder. The data protection coder generates an error protection code and inserts the error protection information into one or more of the useful information channels or into whole-numbered portions of at least one useful information channel in the pulse frame. At the receiving end, the error protection information-containing portion of the signal is supplied to the data protection decoder, which recognizes and corrects errors in all or certain of the channels of the transmitted time division multiplex signal. In this manner, all or individual ones of the useful information channels, which may be utilized for data transmission, can be transmitted with a lower bit error quota without departing from the standardized hierarchy stages of data transmission systems.
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