Digital voice signaling with digital echo detection and voice ac

Details Digital voice signaling with digital echo detection and voice ac Digital voice signaling with digital echo detection and voice ac

1975-03-20

1977-01-25

Claffy, Kathleen H.

179 15AS, 1791708, H04B 320

Patent

active

040052761

ABSTRACT:
A connection system for varied distance digital communication capable of handling telephone signals utilizes Voice Activity Compression (VAC) to effectively share a given number of digital transmission channels among a greater number of virtual telephone connections. The telephone signals are delta-modulated and demodulated in system connection stations. The VAC processing circuits with a small increment of decision logic provide echo suppression. Echo suppression is thereby rendered as a "value-added" service at a relatively small increment of station cost over the cost of VAC processing. Echo interference with original telephone signal activity in the send channels is reduced by digital control of gain in the demodulation stage. The system also provides connections without VAC handling subject to echo control.

REFERENCES:
patent: 2958733 (1960-11-01), Dickieson
patent: 3046347 (1962-07-01), Miedema
patent: 3562448 (1971-02-01), May, Jr.
patent: 3673355 (1972-06-01), La Marche et al.
patent: 3821494 (1974-06-01), Besseyre
patent: 3823275 (1974-07-01), La Marche et al.

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