Method for deriving at least three audio signals from two...

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic

Reexamination Certificate

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C381S019000

Reexamination Certificate

active

06920223

ABSTRACT:
Various equivalent adaptive audio matrix arrangements are disclosed, each of which includes a feedback-derived control system that automatically causes the cancellation of undesired matrix crosstalk components in the matrix output. Each adaptive audio matrix arrangement includes a passive matrix that produces a pair of passive matrix signals in response to two input signals. A feedback-derived control system operates on each pair of passive matrix signals, urging the magnitudes of pairs of intermediate signals toward equality. Each control system includes variable gain elements and a feedback and comparison arrangement generating a pair of control signals for controlling the variable gain elements. Additional control signals may be derived from the two pairs of control signals for use in obtaining more than four output signals from the adaptive matrix.

REFERENCES:
patent: 4589129 (1986-05-01), Blackmer et al.
patent: 4799260 (1989-01-01), Mandell et al.
patent: 5172415 (1992-12-01), Fosgate
patent: 5295189 (1994-03-01), Fosgate
patent: 5428687 (1995-06-01), Willcocks et al.
patent: 5504819 (1996-04-01), Fosgate
patent: 5625696 (1997-04-01), Fosgate
patent: 5644640 (1997-07-01), Fosgate
patent: 5862228 (1999-01-01), Davis
patent: 0949845 (1999-10-01), None
patent: 10062460 (1998-03-01), None
Texas Instruments Incorporated, TL07_Series Low-Noise JFET-Input Operational Amplifiers data sheet, 1996, Dallas, Texas.
Analog Devices, Inc., Dynamic Range Processors/Dual VCA SSM2120/SSM2122 data sheet, 1995, Norwoord, Massachusetts.
Gundry, Kenneth, “A New Active Matrix Decoder for Surround Sound”, AES 19th International Conference on Surround Sound, Jun. 21, 2001, Schloss Elmau, Germany.
Texas Instruments Data Sheets: TL071, TL071A, TL071B, TL072, TL072A, TL072B, TL074, TL074A, TL074B Low-Noise JFET-Input Operational Amplifiers, Dallas, TX 1996.
Texas Instruments Data Sheets: Analog Devices—Dynamic Range Processors/Dual VCA SSM2120/SSM2122, Dallas, TX 1995.
2000, TL074, Quad Low-Noise JFET-Input General-Purpose Operational Amplifier, Texas Instruments Product Sheet published at website address www.ti.com/sc/docs/products/analog/t1074.html.

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