Compandor for group of FDM signals

Details Compandor for group of FDM signals Compandor for group of FDM signals

1979-05-11

1980-09-09

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 23, 370 70, H04J 102

Patent

active

042219345

ABSTRACT:
A system to individually compress the volume range of each voice signal in a group of frequency-division-multiplexed voice signals, without frequency dividing the voice signals into separate channels, includes, in order: a sampler to sample the group of voice signals, an analog-to-digital converter to convert each analog sample a first fast Fourier transform processor producing coefficients, means to direct coefficients representing individual voice signals to respective individual signal channels in which the signal levels are compressed, a second fast Fourier transform processor, and a digit-to-analog converter and band-pass filter to produce an analog group of frequency-division multiplexed voice signals like the original signals but with each voice signal individually compressed in volume range.

REFERENCES:
patent: 3560659 (1971-02-01), Greefkes
patent: 4101738 (1978-07-01), Bellanger et al.

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