Automatic sound field correcting system and a sound field...

Details Automatic sound field correcting system and a sound field... Automatic sound field correcting system and a sound field...

2006-06-06

2006-06-06

Le, Huyen (Department: 2644)

Electrical audio signal processing systems and devices

Including frequency control

C381S103000, C381S101000, C381S102000, C381S107000, C381S108000

Reexamination Certificate

active

07058187

ABSTRACT:
A filter coefficient of a graphic equalizer GEQ is corrected based on detection results of reproduced sounds generated by supplying a noise to all frequency band loudspeakers6FLto6RRand a low frequency band exclusively reproducing loudspeaker6WFvia the graphic equalizer GEQ. Then, attenuation factors of channel-to-channel attenuators ATG1to ATG5are corrected based on the detection results of the reproduced sounds generated by supplying the noise to the loudspeakers6FLto6RRvia the graphic equalizer. Then, delay times of delay circuits DLY1to DLYkare corrected based on the detection results of the reproduced sounds generated by supplying the noise to the loudspeakers6FLto6WFvia the graphic equalizer. Then, an attenuation factor of a channel-to-channel attenuator ATGkis corrected based on the detection results of the reproduced sounds generated by supplying the noise to the loudspeakers6FLto6RRvia the graphic equalizer and the detection result of the reproduced sound generated by supplying the noise to the loudspeaker6WFvia the graphic equalizer, whereby levels of the reproduced sounds reproduced by the loudspeakers6FLto6WFare adjusted to be made flat over the audio frequency band.

REFERENCES:
patent: 5386478 (1995-01-01), Plunkett
patent: 5581621 (1996-12-01), Koyama et al.
patent: 624 947 (1994-11-01), None
Patent Abstracts of Japan, vol. 005, No. 129, Aug. 19, 1981.

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