Protection of Digitally Transmitted Sound Signals Against Bit Errors and Multiplexing of Several Channels

Based on a previous publication indicating a coding pro- cedure for sound signals, this paper studies the influence of bit errors on the coded signal. This includes the description and evaluation of possibilities of concealing this influence with the aid of a simple parity check. In connection with the error protection, a multiplex frame is indicated for six coded sound channels. Trial transmissions with an accurate error analysis have been successfully carried out in the net- work of the Deutsche Bundespost.