Sound-wave receiving appliance

Electrical audio signal processing systems and devices – Having non-electrical feature – Having microphone

Patent

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Details

381120, 381152, 381188, 381190, 381205, H04R 102

Patent

active

047003960

ABSTRACT:
A sound-wave receiving applicance comprises a resonance panel and a crystal type piezoelectric microphone responsive to oscillations generated by the soundwaves, said microphone being adapted for connection to an amplifier. The crystal of the microphone is subjected, between two pole members, to a mechanical initial pressure to increase the pressure sensitivity of the microphone relative to the resonance panel. The receiving applicance preferably has means for manual adjustment of the initial pressure which is absorbed by the resonance panel via one pole member. The resonance panel of the receiving appliance preferably is made of a material, such as a cellular plastic, having a higher porosity and a lower specific gravity than ordinary wood.

REFERENCES:
patent: 1560502 (1925-11-01), Forest
patent: 2350010 (1944-05-01), Beckley
patent: 2565159 (1951-08-01), Williams
patent: 3058015 (1962-10-01), Nesh
patent: 3167668 (1965-01-01), Nesh
patent: 3908503 (1975-09-01), Bolin
patent: 4104945 (1978-08-01), Bolin
patent: 4204096 (1980-05-01), Barcus et al.
patent: 4593404 (1986-06-01), Bolin

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