Method of correcting sound field in an audio system

Details Method of correcting sound field in an audio system Method of correcting sound field in an audio system

2007-01-30

2007-01-30

Mei, Xu (Department: 2615)

Electrical audio signal processing systems and devices

Including frequency control

C381S103000, C381S094300, C381S107000

Reexamination Certificate

active

09781274

ABSTRACT:
In correcting the sound field, the loudspeakers6FLto6WFare sounded by the noise. The attenuation factors of the inter-band attenuators ATF11to ATFkifor adjusting gains of the band-pass filters BPF11to BPFkito the frequency in respective channels are corrected based on detection results of the reproduced sounds of the loudspeakers6FLto6WF. Then, the attenuation factors of the channel-to-channel attenuators ATG1to ATG5are corrected based on the detection results of the reproduced sounds of the loudspeakers6FLto6WF. Then, the delay times of the delay circuits DLY1to DLY5are corrected based on the detection results of the reproduced sounds of the loudspeakers6FLto6WF. Then, the attenuation factor of the channel-to-channel attenuator ATGkis corrected based on the detection result of the reproduced sound of the loudspeaker6WFas the subwoofer, whereby the levels of the reproduced sounds reproduced by the loudspeakers6FLto6WFare adjusted to be made flat over the audio frequency band.

REFERENCES:
patent: 4739513 (1988-04-01), Kunugi et al.
patent: 5386478 (1995-01-01), Plunkett
patent: 5506910 (1996-04-01), Miller et al.
patent: 5581621 (1996-12-01), Koyama et al.
patent: WO 98/20706 (1998-05-01), None
Japanese Abstract No. 10136498, dated May 22, 1998.

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