Acoustic quality enhancement via feedback and equalization...

Details Acoustic quality enhancement via feedback and equalization... Acoustic quality enhancement via feedback and equalization...

2006-04-04

2006-04-04

Woo, Stella (Department: 2643)

Electrical audio signal processing systems and devices

Including frequency control

Having automatic equalizer circuit

C381S102000, C381S056000, C381S059000

Reexamination Certificate

active

07024008

ABSTRACT:
A method of enhancing the audio quality in a reproduction medium having unknown characteristics. With this method a predetermined finite set of single frequency tones are generated and these tones are then passed through the reproduction medium to generate an output signal, which in turn is passed through a set of sub-band filters. Each of the sub-band filters pass at least a frequency corresponding to one of the tones in the set of tones. The characteristics of the reproduction medium is then estimated as a result of passing the output signal through the set of sub-band filters. Based on the estimated characteristics of the reproduction medium, a set of sub-band inverse filters are constructed. Finally before passing the audio signal through the reproduction medium the signal is passed through the set of inverse filters to improve the quality of the audio signal after it passes through the reproduction medium.

REFERENCES:
patent: 5297198 (1994-03-01), Butani et al.
patent: 5600718 (1997-02-01), Dent et al.
patent: 5680450 (1997-10-01), Dent et al.
patent: 5818945 (1998-10-01), Makino et al.
patent: 6252968 (2001-06-01), Narasimhan et al.

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