Digital multiplexer with increased channel capacity

Details Digital multiplexer with increased channel capacity Digital multiplexer with increased channel capacity

1980-04-30

1982-07-13

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370118, 179 1555R, H04J 318

Patent

active

043398189

ABSTRACT:
A digital multiplexer accommodates a large number of voice channels per digital channel through use of an improved statistical coding technique. Analog information on the voice channels is encoded into multibit digital words by PCM encoders and the bit position at the output of each PCM encoder is staggered such that a predetermined bit in each word is presented at different times to encoder outputs. The multibit digital words are converted to multibit digital code words and the code words are in turn converted into a PAM signal for transmission over a communications highway. Bit staggering advantageously allows the use of a minimum number of PAM signal levels in comparison to prior art techniques.
An executive conferencing arrangement is also provided wherein PCM encoder outputs from a plurality of communications channels are multiplied by predetermined analog voltages, the analog voltages are summed from each channel and the sum is subtracted from a fixed analog voltage whose value is dependent on the number of communications channels. The difference signal is utilized to set up a conferencing arrangement wherein each communications channel carrying analog information is connected to each communications channel not carrying analog information.

REFERENCES:
patent: 3030614 (1962-04-01), Lehan
patent: 3238298 (1966-03-01), Willis
patent: 3299204 (1967-01-01), Cherry

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