Electrical audio signal processing systems and devices – Including frequency control
Reexamination Certificate
2007-01-30
2007-01-30
Mei, Xu (Department: 2615)
Electrical audio signal processing systems and devices
Including frequency control
C381S102000
Reexamination Certificate
active
10660447
ABSTRACT:
Audio processing methods and apparatus are provided for at least partially compensating for the Fletcher-Munson effect. An audio processor includes a variable filter receiving an input signal and providing a filtered output signal, the variable filter having a fixed cutoff frequency and a quality factor that is controllable in response to a control signal, and a control circuit configured to detect a signal level representative of input signal level in a selected band and to generate the control signal in response to the detected signal level. The control circuit may include a low-pass band select filter and a detector for detecting a signal level in the band selected by the low-pass filter and for generating the control signal.
REFERENCES:
patent: 3789313 (1974-01-01), Sanderson
patent: 4327250 (1982-04-01), von Recklinghausen
patent: 4429181 (1984-01-01), Freadman
patent: 4696044 (1987-09-01), Waller, Jr.
patent: 4739514 (1988-04-01), Short et al.
patent: 4750207 (1988-06-01), Gebert et al.
patent: 4940977 (1990-07-01), Mandell
patent: 5170434 (1992-12-01), Anderson
patent: 5172358 (1992-12-01), Kimura
patent: 5200716 (1993-04-01), Amano
patent: 5285502 (1994-02-01), Walton et al.
patent: 5331299 (1994-07-01), Smith
patent: 5337368 (1994-08-01), Kikuchi et al.
patent: 5371803 (1994-12-01), Williamson, III
patent: 5550925 (1996-08-01), Hori et al.
patent: 5574398 (1996-11-01), Hagino et al.
patent: 5907623 (1999-05-01), Mercs et al.
patent: 5910904 (1999-06-01), Uramoto
patent: 5974156 (1999-10-01), Sauvagerd
patent: RE37223 (2001-06-01), Bose et al.
Burlingame Gregory B.
David John R.
Martin Stephen L.
Rogge Glenn G.
Boston Acoustics, Inc.
Mei Xu
Nieves Peter A.
Sheehan Phinney Bass & Green P.A.
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