Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent
1993-12-07
1995-09-19
Brinich, Stephen
Electrical audio signal processing systems and devices
Directive circuits for microphones
381155, H05K 500
Patent
active
054523648
ABSTRACT:
A system and method for conducting surveys of vocalizing wildlife by determining the direction species of wildlife that emit vocalizations is disclosed. The system includes a sound receiving unit (12) with a set of three microphones (14, 16, 18) for monitoring the vocalizations. The signals received by the microphones are supplied to an audio signal processing circuit (20) that produces a set of subtractive signals indicating the relative signal strength of the received signals and a digital signal representative of the period of the received vocalizations. The signals produced by the audio signal processing circuit are supplied to a central processing unit (22). The central processing unit calculates the frequency of the vocalization based digital signal representative of the period of the signal and based on a set of these signals determines the species that emitted the vocalizations. A angular detection circuit integral with the audio signal processing circuit determines the angular direction relative to the sound receiving unit of from where the vocalization originated based on the subtractive signals.
REFERENCES:
patent: 3895188 (1975-07-01), Ingraham
patent: 4037052 (1977-07-01), Doi
patent: 4629834 (1986-12-01), Waggoner et al.
patent: 4836328 (1989-06-01), Ferralli
P. U. Alkon, "Acoustic Biotelemetry for Wildlife Research: A Preliminary Test and Prospects," Wildlife Soc. Bull., 14:193-196, 1986.
W. M. Schleidt "The Animal as a Sound Source," Int'l Conf. on Telemetry and Radio Tracking in Biology and Medicine (Univ. of Oxford 1979) Pergamon Press Ltd. 1980.
Brinich Stephen
Goldenberg David S.
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