Automatic gain control using root-mean-square circuitry in a dig

Details Automatic gain control using root-mean-square circuitry in a dig Automatic gain control using root-mean-square circuitry in a dig

1990-03-06

1991-07-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370113, 370119, 375 98, H04J 300, H04L 2708

Patent

active

050291629

ABSTRACT:
An automatic gain control for an inputted multiplex PCM data stream in a conferencing bridge in a telephone system. The inputted multiplexed data stream has a predetermined number of time slots wherein each time slot carries PCM speech data corresponding to an individual party in the conference call. The control of the present invention is capable of operating in .mu.-Law or A-Law companded format at a frequency of 192-256 kilobytes per second. The automatic gain control incorporates a digital root-mean-square meter, a COUNT sequence to change GAIN at predetermined intervals, and a set of GAIN rules to selectively increase or decrease GAIN based upon the output of the digital root-mean-square meter.

REFERENCES:
patent: 3908088 (1975-09-01), Gutleber
patent: 3958084 (1976-05-01), Nicholas
patent: 4009350 (1977-02-01), Cabet
patent: 4272648 (1981-06-01), Agrawal et al.
patent: 4354273 (1982-10-01), Areseki
patent: 4464723 (1984-08-01), Chartier
patent: 4539692 (1985-09-01), Munter
patent: 4626629 (1986-12-01), Premoli
patent: 4691176 (1987-09-01), Asiung et al.
patent: 4747065 (1988-05-01), West
patent: 4775988 (1988-10-01), Chevillat et al.
"Telecommunications Transmission Engineering", AT & T Technologies, 1977, p. 250.

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