Combined multirate-based and fir-based filtering technique...

Details Combined multirate-based and fir-based filtering technique... Combined multirate-based and fir-based filtering technique...

2007-05-11

2011-12-13

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Including frequency control

C381S099000

Reexamination Certificate

active

08077880

ABSTRACT:
A combined multirate-based Finite Impulse Response (FIR) filter equalization technique combines a low-order FIR equalization filter operating at a lower rate for equalization of a loudspeaker-room response at low frequencies, and a complementary low-order minimum-phase FIR equalization filter operating at a higher rate for equalization of the loudspeaker-room response at higher frequencies. The design of two complementary band filters for separately performing low and high frequency equalization, keeps the system delay at a minimum while maintaining excellent equalization performance. Splicing between the two equalization filters, for maintaining a flat magnitude response in the transition region of the two complementary filters, is done automatically through level adjustment of one equalization filter relative to the other. The present invention achieves excellent equalization at low filter orders and hence reduced computational complexity.

REFERENCES:
patent: 4888808 (1989-12-01), Ishikawa et al.
patent: 5572443 (1996-11-01), Emoto et al.
patent: 5805715 (1998-09-01), Rhee
patent: 2004/0264718 (2004-12-01), Arai
patent: 2005/0244012 (2005-11-01), Asada

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