Transmitting a digital signal and an additional signal

Details Transmitting a digital signal and an additional signal Transmitting a digital signal and an additional signal

H - Electricity

04

B

354/67

H04B 17/00 (2006.01) H04J 3/12 (2006.01) H04L 25/49 (2006.01)

Patent

CA 1209706

TRANSMITTING A DIGITAL SIGNAL AND AN ADDITIONAL SIGNAL ABSTRACT OF THE DISCLOSURE A digital signal, such as a t.d.m. PCM signal, is redundantly encoded in that sequences of n bits of the signal are transmitted as sequences of m bits, where m>n. Different sets of m-bit sequences are used to transmit the n-bit sequences in dependence upon the state of an additional signal, which may be a superframe indication signal. At a receiver, the digital signal and additional signal are reproduced. In the described embodiment m=n+2, providing further redundancy to facilitate providing such desirable transmission code properties as maintaining d.c. balance and detecting errors on the transmission link.

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