Circuit arrangement for reducing the dynamic range of audio...

Details Circuit arrangement for reducing the dynamic range of audio... Circuit arrangement for reducing the dynamic range of audio...

2003-07-09

2008-09-30

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Including amplitude or volume control

C381S106000, C381S107000, C381S098000, C704S225000, C704S500000, C704S503000

Reexamination Certificate

active

07430296

ABSTRACT:
An audio system includes a first transformation device provided with an input audio signal and which transforms the input audio signal from the time domain to the frequency domain resulting in an input spectrum. The system also includes a spectral processing device, which is connected downstream from the first transformation device, that receives the input spectrum and produces from it an output spectrum with a dynamic range that is reduced from that of the input spectrum. The system further includes a second transformation device connected downstream from the spectral processing device, and provided with the output spectrum. The second transformation device transforms the output spectrum from the frequency domain to the time domain, and provides an output audio signal.

REFERENCES:
patent: 4221934 (1980-09-01), Schiff
patent: 4701722 (1987-10-01), Dolby
patent: 5255324 (1993-10-01), Brewer et al.
patent: 6005953 (1999-12-01), Stuhlfelner
patent: 6577739 (2003-06-01), Hurtig et al.
patent: 7013011 (2006-03-01), Weeks et al.
patent: 2001/0055404 (2001-12-01), Bisgaard
patent: 2002/0076072 (2002-06-01), Cornelisse
patent: WO 99/14986 (1999-03-01), None
patent: WO 02/15395 (2002-02-01), None

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