Apparatus for processing speech in radioelectric transmitter/rec

Telecommunications – Transmitter and receiver at separate stations – With control signal

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333 14, 381106, H04B 164

Patent

active

045518530

ABSTRACT:
Apparatus for processing speech in radioelectric transmitter/receiver equipment is adapted to transmitting and receiving speech. The apparatus comprises a compression circuit for compressing the dynamic range of the speech signal, said compression circuit being formed by at least one variable transmission attenuator for maintaining the level of speech modulation substantially constant throughout speech transmission. An expander re-establishes on reception the level of speech before it was compressed. An expander control device is responsive to the attenuation value applied by the transmission attenuator and transmitted over an auxiliary radioelectric frequency channel of the equipment. The compression circuit is an incremental compression circuit with a time anticipated action. A logical filter circuit for filtering the level of the transmission speech is also provided for controlling the compression circuit in constant attenuation steps in such a manner as to maintain the transmission speech level substantially constant and for transmitting the corresponding incremental attenuation values over the auxiliary channel. The expander control device includes an interpolation circuit for correcting presumed errors in the received signals representative of the attenuation values applied on transmission by the logical filter circuit.

REFERENCES:
patent: 3602818 (1971-08-01), Anderlecht et al.
patent: 4123711 (1978-10-01), Chow
patent: 4271499 (1981-06-01), Leveque
patent: 4295223 (1981-10-01), Shutterly
"High-Quality Radiotelephone Communication"-Sharp Electronic Engineering, vol. 42, No. 506, pp. 74-77, Apr. 1970.

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