Digital sound level control apparatus

Details Digital sound level control apparatus Digital sound level control apparatus

1993-11-24

1996-02-27

Hofsass, Jeffery A.

Telephonic communications

Substation or terminal circuitry

Amplifying

379165, 379 93, 379 94, H04M 160

Patent

active

054955297

ABSTRACT:
A digital sound level control apparatus for adjusting the reception sound level from all telephone circuits to a substantially fixed level comprises a region discrimination circuit for discriminating a PCM input data signal from a PCM conversion section, including a segment coder for compressing and decompressing a digital audio signal, among an intrinsic variation signal, a basic normalization level signal and a coding threshold value, a multiplication circuit for outputting an input level signal of 12 bits, an addition circuit, a register for holding a pad multiplication value corresponding to a reception circuit, another multiplication circuit for multiplying the input level value by the pad multiplication value to output a output level signal for outputting sound by a predetermined sound level, and a comparison region discrimination circuit, a subtraction circuit, a division circuit and a register for regenerating an 8-bit digital signal from the output level signal.

REFERENCES:
patent: 3688097 (1972-08-01), Montgomerry
patent: 3752970 (1973-08-01), Aaron et al.
patent: 5070524 (1991-12-01), Mano
patent: 5224159 (1993-06-01), Komuro
patent: 5259001 (1993-11-01), Corceto et al.
patent: 5287106 (1994-02-01), Senderowicz et al.
patent: 5301205 (1994-04-01), Tsutsui et al.

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