Reduced complexity audio mixing apparatus

Details Reduced complexity audio mixing apparatus Reduced complexity audio mixing apparatus

2006-05-02

2006-05-02

Le, Huyen (Department: 2644)

Electrical audio signal processing systems and devices

With mixer

C381S104000

Reexamination Certificate

active

07039203

ABSTRACT:
A plurality of audio inputs which require gain applied are coupled together, the gain is applied and that weighted signal is summed with the output of similar circuits running with different gains. For typical overall gain requirements of 0 to +22.5 dB to be applied in 1.5 dB increments, the new circuit reduces by over two-thirds the number of analog switches required in the level adjusting portion of an audio mixer. More generally, the complexity of the new circuit, in terms of the number of analog switching elements is 2m(1+log2n) for m channels with n gain steps/channel. The number of stages of differing gain is reduced from 2m variable gain amplifiers to 2(1+log2n) fixed gain amplifiers.

REFERENCES:
patent: 3845392 (1974-10-01), Covill
patent: 4472834 (1984-09-01), Yamamuro et al.
patent: 4524452 (1985-06-01), Marshak
patent: 5511423 (1996-04-01), Sugiyama
patent: 5633938 (1997-05-01), Porter, III
patent: 6404892 (2002-06-01), Heyl

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