Speaker array and microphone array

Details Speaker array and microphone array Speaker array and microphone array

2011-08-16

2011-08-16

Faulk, Devona E (Department: 2614)

Electrical audio signal processing systems and devices

Directive circuits for microphones

C381S077000, C381S079000, C381S111000, C381S098000, C381S122000

Reexamination Certificate

active

08000481

ABSTRACT:
A speaker array, includes a plurality of speakers which are linearly arranged at a predetermined interval; and one-dimensional digital filters which are provided to correspond to the speakers respectively, in which predetermined filter coefficients are set previously, and which apply a filtering process to input sound data in response to the filter coefficients to output. Sound data derived by applying a digital conversion to input sound signals are supplied to respective one-dimensional digital filters. Sound signals derived by applying an analog conversion to the sound data output from respective one-dimensional digital filters are supplied to corresponding speakers to output a sound in response to the sound signals. The filter coefficients set in respective one-dimensional digital filters give an amplitude characteristic to a two-dimensional digital filter such that, when a frequency characteristic of the two-dimensional digital filter constructed by respective one-dimensional digital filters is represented by a two-dimensional frequency plane, a plurality of ripples are provided in a stop band in a section in a spatial frequency direction and also an amplitude of ripples in a non-physical area out of a plurality of ripples is larger than an amplitude of ripples in a physical area.

REFERENCES:
patent: 0 381 498 (1990-08-01), None
Nishikawa, K., et al.—“Wideband Beamforming Using Fan Filter”; (Proceedings of the International Symposium on Circuits and Systems; San Diego, May 10-13, 1992).
Nishikawa, K., et al.—“A Design Method of 2d FIR Fan Filters for Wideband Beam Forming Means of 2d Fourier Series Approximation”; (Electronic & Communications in Japan, Part III—Fundamental Electronic Science (Wiley, Hoboken, NJ, US) vol. 85, No. 7, Part 3, 2002, pp. 38-49, XP001102659—ISSN: 1042-0967.
Nishikawa, K., et al.—“A Method for Changing Sound-Image Position Using the Linear Loudspeaker Array and Two-Dimensional FIR Digital Filter”; (Electronics & Communications in Japan, Part III—Fundamental Electronic Science, (Wiley, Hoboken, NJ, US) vol. 85, No. 4, Part 3, Apr. 2002; Part 3, Apr. 2002, pp. 20-31, XP001124737; ISSN: 1042-0967.

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