Electrical audio signal processing systems and devices – Dereverberators
Reexamination Certificate
2002-11-14
2010-06-22
Lee, Ping (Department: 2614)
Electrical audio signal processing systems and devices
Dereverberators
C381S093000
Reexamination Certificate
active
07742607
ABSTRACT:
In a room with strong low-frequency modes the control of excessively long decays is problematic or impossible with conventional passive means. In this patent application a systematic methodology is presented for active modal equalization able to correct the modal decay behaviour of a loudspeaker-room system. Two methods of modal equalization are proposed. The first method modifies the primary sound such that modal decays are controlled. The second method uses separate primary and secondary radiators and controls modal decays with sound fed into at least one secondary radiator. Case studies of the first method of implementation are presented.
REFERENCES:
patent: 4947360 (1990-08-01), Dyer
patent: 5226057 (1993-07-01), Boren
patent: 5263019 (1993-11-01), Chu
patent: 5325204 (1994-06-01), Scarpa
patent: 5400084 (1995-03-01), Scarpa
patent: 5491754 (1996-02-01), Jot et al.
patent: 5559891 (1996-09-01), Kuusama et al.
patent: 5815580 (1998-09-01), Craven et al.
patent: 5949894 (1999-09-01), Nelson et al.
patent: 0 505 949 (1992-09-01), None
patent: 0 535 737 (1997-06-01), None
patent: 1 017 166 (2000-07-01), None
patent: 1130608 (1989-05-01), None
patent: 02142300 (1990-05-01), None
patent: 02150197 (1990-06-01), None
patent: 03106208 (1991-05-01), None
patent: 04194996 (1992-07-01), None
patent: 11262095 (1999-09-01), None
Aki Makivirta et al, “Low-Frequency Modal Equalization of Loudspeaker-Room Responses”, AES 111th Convention, New York Sep. 21-24, 2001, p. 1-9.
Karjalainen et al, “Estimation of Model Decay Parameters from Noisy Response Measurements”, AES 110th Convention, Amsterdam, The Netherlands, May 12-15, 2001.
“Estimation of Modal Decay Parameters from Noisy Response Measurements,” M. Karjalainen et al., presented at the AES 110thConvention, Amsterdam, The Netherlands, May 12-15, 2001.
S.J. Elliott et al., “Multi-Point Equalization in a Room Using Adaptive Digital Filters,” Journal of the Audio Engineering Society, Audio Engineering Society, New York, U.S., vol. 37, No. 11, Nov. 1, 1989, pp. 899-907, XP000142129. ISSN: 0004-7554.
J. Proakis et al., “Digital Signal Processing,” 1989, McMillan Publishing Company, New York, XP002322985, pp. 172-175.
J. Mourjopoulos et al., “Pole and Zero Modeling of Room Transfer Functions,” Journal of Sound and Vibration, vol. 146(2), Apr. 22, 1991, XP002322984.
Antsalo Poju
Karjalainen Matti
Mäkivirta Aki
Välimäki Vesa
Birch & Stewart Kolasch & Birch, LLP
Genelec Oy
Lee Ping
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