Digital communications system for speech signals - uses microprocessor to convert voice signals into PCM signals for TDM transmission with telex signals

摘要

The communications system, for transmitting in digital form voice and other signals, converts the voice signals into PCM signals before transmission and sends at a max. rate of 10 kbit/s. These PCM voice signals are sent out in TDM mode with other digital signals, especially telex and telecopier signals. The voice signals are converted into PCM signals with a transfer rate of 2.4 or 4.8 kbit/s. A microprocessor is used to aid analog/PCM and PCM/analog conversion.