DSP decoder for decoding analog SR encoded audio signals

Details DSP decoder for decoding analog SR encoded audio signals DSP decoder for decoding analog SR encoded audio signals

1995-11-22

1999-06-08

Loomis, Paul

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

381 22, 381 23, 381108, H03G 700

Patent

active

059109955

ABSTRACT:
A decoder capable of decoding audio signals encoded using analog noise reduction techniques, particularly Dolby SR, is implemented by means of digital signal processing. The typical decoding paradigm used by analog Dolby SR decoders is modified to overcome the problems caused by delay which is introduced by the digital implementation. A gain factor is factored out of the feedback transfer function and is placed in the forward signal path of each stage of the digital decoder. A single control circuit can then be used to generate coefficients which define transfer functions of each filter stage of the signal path. Linear interpolation techniques are used to limit the number of coefficient entries necessary to emulate the transfer function of an analog Dolby SR decoder. The digital decoder structure can be inverted to produce a digital encoder which is capable of implementing any noise reduction standard desired, including Dolby SR.

REFERENCES:
patent: 4736433 (1988-04-01), Dolby
patent: 4922535 (1990-05-01), Dolby
patent: 5185806 (1993-02-01), Dolby et al.
patent: 5483600 (1996-01-01), Werrbach
patent: 5677951 (1997-10-01), Gay
Matlab user's guide, pp. 2-49, 2-50, Aug. 1982.
Simulink quick reference, pp. 8-9, 12, May 1994.
Widrow et al., Adaptive signal processing, Prentice-Hall, Inc., pp. 6-13, 1985.

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