Transmission process and device for implementing the so-improved

Details Transmission process and device for implementing the so-improved Transmission process and device for implementing the so-improved

1982-02-08

1984-08-07

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

375122, G10L 100, H04J 602

Patent

active

044647824

ABSTRACT:
An improved split-band coder reduces signal-processing time, thereby reducing echo delay time and listener confusion. The voice-originated signal to be transmitted over a transmission line is sampled and digitally coded at a relatively high bit rate; the spectrum of said signal is then partitioned into p sub-bands. The sample stream of the signal so-filtered and partitioned into p sub-bands is split into blocks of samples, or portions, of a given time duration. A requantizing device proceeds for each block to the requantizing of the samples in each sub-band by means of requantizing parameters derived from the samples of the preceding sample block, whereas new requantizing parameters are determined and stored with a view to requantizing the following sample block. The requantized samples in the different sub-bands are multiplexed, and transmitted over the transmission line, together with the values of the highest amplitude samples in each sub-band.

REFERENCES:
patent: 4142071 (1979-02-01), Croisier et al.
patent: 4191858 (1980-03-01), Araseki
patent: 4216354 (1980-08-01), Esteban et al.

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