Electrical audio signal processing systems and devices – Hearing aids – electrical – Directional
Reexamination Certificate
2003-03-06
2008-08-05
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Hearing aids, electrical
Directional
C381S092000, C381S097000
Reexamination Certificate
active
07409068
ABSTRACT:
A low-noise directional microphone system includes a front microphone, a rear microphone, a low-noise phase-shifting circuit and a summation circuit. The front microphone generates a front microphone signal, and the rear microphone generates a rear microphone signal. The low-noise phase-shifting circuit implements a frequency-dependent phase difference between the front microphone signal and the rear microphone signal to create a controlled loss in directional gain and to maintain a maximum level of noise amplification over a pre-determined frequency band. The summation circuit combines the front and rear microphone signals to generate a directional microphone signal.
REFERENCES:
patent: 4399327 (1983-08-01), Yamamoto et al.
patent: 4527282 (1985-07-01), Chaplin et al.
patent: 4536887 (1985-08-01), Kaneda et al.
patent: 4653102 (1987-03-01), Hansen
patent: 4703506 (1987-10-01), Sakamoto et al.
patent: 4731850 (1988-03-01), Levitt et al.
patent: 4879749 (1989-11-01), Levitt et al.
patent: 5058170 (1991-10-01), Kanamori et al.
patent: 5137110 (1992-08-01), Bedard, Jr. et al.
patent: 5226076 (1993-07-01), Baumhauer, Jr. et al.
patent: 5226087 (1993-07-01), Ono et al.
patent: 5289544 (1994-02-01), Franklin
patent: 5400409 (1995-03-01), Linhard
patent: 5473701 (1995-12-01), Cezanne et al.
patent: 5483599 (1996-01-01), Zagorski
patent: 5524056 (1996-06-01), Killion et al.
patent: 5581620 (1996-12-01), Brandstein et al.
patent: 5732143 (1998-03-01), Andrea et al.
patent: 5737430 (1998-04-01), Widrow
patent: 5757933 (1998-05-01), Preves et al.
patent: 5764778 (1998-06-01), Zurek
patent: 5785661 (1998-07-01), Shennib
patent: 5793875 (1998-08-01), Lehr et al.
patent: 5825897 (1998-10-01), Andrea et al.
patent: 5862240 (1999-01-01), Ohkubo et al.
patent: 6002776 (1999-12-01), Bhadkamkar et al.
patent: 6061456 (2000-05-01), Andrea et al.
patent: 6069961 (2000-05-01), Nakazawa
patent: 6084973 (2000-07-01), Green et al.
patent: 6101258 (2000-08-01), Killion et al.
patent: 6122389 (2000-09-01), Grosz
patent: 6154552 (2000-11-01), Koroljow et al.
patent: 6192134 (2001-02-01), White et al.
patent: 6222927 (2001-04-01), Feng et al.
patent: 6327370 (2001-12-01), Killion et al.
patent: 6473514 (2002-10-01), Bodley et al.
patent: 6654468 (2003-11-01), Thompson
patent: 6751325 (2004-06-01), Fischer
patent: 6766029 (2004-07-01), Maisano
patent: 6954535 (2005-10-01), Arndt et al.
patent: 2003/0147538 (2003-08-01), Elko
patent: 0802699 (1997-10-01), None
patent: WO 99/04598 (1999-01-01), None
patent: 1351544 (2003-08-01), None
Frost, Otis Lamont, “An Algorithm for Linearly Constrained Adaptive Array Processing” Proceedings of the IEEE, vol. 60, No. 8, pp. 926-935.
The European Search Report for EP application 03005062.9 (corresponding to EP publication 1 351 544) which is the European counterpart to the present application.
Csermak Brian D.
Ryan Jim G.
Chin Vivian
Kurr Jason R
Sound Design Technologies, Ltd.
Van Dyke Gardner, Linn & Burkhart, LLP
LandOfFree
Low-noise directional microphone system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low-noise directional microphone system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-noise directional microphone system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3994442