Sound field variable apparatus

Details Sound field variable apparatus Sound field variable apparatus

1991-04-19

1993-08-03

Ng, Jin F.

Electrical audio signal processing systems and devices

Sound effects

381 63, 381 77, 381 83, 381 93, H03G 300

Patent

active

052336611

ABSTRACT:
A sound field is generated responsive to direct sound picked up by a direct-sound collecting microphone and indirect-sound picked up by an indirect-sound collecting microphone. Respective processing circuits are provided for signal processing the sound signals of the direct-sound collecting microphone and the indirect-sound collecting microphone. An adaptive filter is provided having a transfer function equal to a transfer function from a reproducing speaker to the indirect-sound collecting microphone. The output of the signal processing circuit associated with the indirect-sound collecting microphone is filtered by the adaptive filter, and the output of the adaptive filter is subtracted from the output of the indirect-sound collecting microphone. The output of the subtractor is then applied to the signal processing circuit associated with the indirect-sound collecting microphone for signal processing. The transfer function is initially set in the adaptive filter by applying an output of a signal generator thereto.

REFERENCES:
patent: 4061876 (1977-12-01), Jaffe
patent: 4593404 (1986-06-01), Bolin
patent: 4783818 (1988-11-01), Graupe et al.
patent: 5025472 (1991-06-01), Shimizu et al.

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