Electroacoustic transducer of digital type

Details Electroacoustic transducer of digital type Electroacoustic transducer of digital type

1999-02-11

2000-09-26

Isen, Forester W.

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

381150, H04R 300, H04R 2500

Patent

active

061251895

ABSTRACT:
A digital type electroacoustic transducer converts between a digital electric signal and an analog acoustic signal and includes units A (sounding bodies) arranged on the same plane as that of units B (sound receiving sensors), with the number of group units being decided at a ratio corresponding to a digit position of each bit of the digital signal. When the bit exists, a power source for electrode driving and the group unit are connected, and both of an electric/acoustic conversion and a digital/analog conversion are simultaneously executed through the unit A. The units B provide an addition value of all outputs of the units A. After a level of the detection acoustic signal is adjusted by a preamplifier, the signal is delta modulated and supplied to an arithmetic operating circuit. When a digital electric signal which is input does not exist, only the acoustic signal which arrives at the diaphragm surface of the unit B is input to the arithmetic operating circuit. A digital signal proportional to the acoustic signal is derived from a digital type electroacoustic transducer output terminal.

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Yanagisawa "Present Existing State of Loudspeaker Directly Driven with Digital Signals", Jun. 1995, vol. 78 No. 5, pp. 565-569.
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Patent Abstracts of Japan, vol. 8, No. 8 (E-221), Jan. 13, 1984 & JP 58171200 A (Tokyo Shibaura Denki KK), Oct. 7, 1983.
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Patent Abstracts of Japan, vol. 95, No. 11, Dec. 26, 1995 & JP 07227000A (Audio Technica Corp.), Aug. 22, 1995.
Patent Abstracts of Japan, vol. 9, No. 65 (E-304), Mar. 26, 1985 & JP 59202799A (Onkyo KK), Nov. 16, 1984.

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