Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo sound pickup device
Patent
1996-05-30
1998-02-03
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Stereo sound pickup device
381 681, 381 92, H04R 5027
Patent
active
057153191
ABSTRACT:
An end fire microphone array having reduced analog-to-digital converter requirements is disclosed. Analog filters are used to band-limit at least two secondary microphone elements which are spaced from a primary microphone element a distance respective of their band limited outputs. The band-limited secondary microphone outputs are combined by an analog summer and the primary microphone and combined secondary microphone signals are digitized by an analog-to-digital converter. A signal processor performs a super-directive analysis of the primary microphone signal and the combined secondary microphone signals.
A steerable superdirective microphone array is disclosed. A plurality of microphones are arranged in a ring. The microphone outputs are digitized, split into frequency bands, and weighted sums are formed for each of a plurality of directions. A steering control circuit evaluates the relative energy of each directional signal in each band and selects a microphone direction for further processing and output.
REFERENCES:
patent: 4466067 (1984-08-01), Fontana
patent: 4589137 (1986-05-01), Miller
patent: 4955003 (1990-09-01), Goldman
patent: 5058170 (1991-10-01), Kanamori et al.
patent: 5263019 (1993-11-01), Chu
patent: 5305307 (1994-04-01), Chu
J. Kates, "Superdirective Arrays for Hearing Aids", J. Acoust. Soc. Am., vol. 94(4), pp. 1930-1933.
H. Cox et al., "Practical Supergain", IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-34, pp. 393-398, Jun. 1986.
H. Cox et al., "Robust Adaptive Beamforming", IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-35, pp. 1365-1376, Oct. 1987.
J. Kates, "An Evaluation of Hearing-Air Array Processing", 1995 IEEE ASSP, Workshop on Applications of Signal Processing to Audio and Acoustics, New Paltz, New York.
J.E. Hudson, Adaptive Array Principles, pp. 69-69, copyright 1981, New York: Peter Peregrinus for IEE.
Walter Kellermann, "A Self-Steering Digital Microphone Array", IEEE Proc. Int. Conf. Acoustics, Speech & Signal Processing, pp. 3581-3584, May 1991.
M.M. Goodwin et al., "Constant Beamwidth Beamforming", IEEE Proc. Int. Conf. Acoustics, Speech & Signal Processing, pp. 169-172, Apr. 1993.
Isen Forester W.
PictureTel Corporation
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