Electrical audio signal processing systems and devices – Including frequency control
Reexamination Certificate
2005-08-09
2005-08-09
Tran, Sinh (Department: 2644)
Electrical audio signal processing systems and devices
Including frequency control
C381S103000, C381S094300, C381S101000, C381S102000, C381S107000, C381S108000
Reexamination Certificate
active
06928172
ABSTRACT:
In correcting the sound field, 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. The attenuation factors of channel-to-channel attenuators ATG1to ATG5are corrected based on the detection results of the reproduced sounds of the loudspeakers6FLto6WF. The delay times of delay circuits DLY1to DLY5are corrected based on the detection results of the reproduced sounds of the loudspeakers6FLto6WF. The attenuation factor of a channel-to-channel attenuator ATGkis corrected based on the detection result of the reproduced sound of the loudspeaker6WFas the subwoofer. Therefore, 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: 5581621 (1996-12-01), Koyama et al.
patent: 10-136498 (1998-05-01), None
patent: WO 98/20706 (1998-05-01), None
Michalski Justin
Pioneer Corporation
Tran Sinh
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