Dual cavity pressure microphones

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only

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Details

381154, 381159, 381161, 381169, 381191, H04R 1904, H04R 102, H04R 128

Patent

active

047776501

ABSTRACT:
A dual cavity pressure microphone comprising a microphone housing and an oscillating element mounted in or on said housing. The oscillating element including a membrane which is in principle only sensitive to a sound field on one side, the second side forming part of a closed cavity in the microphone housing, said cavity being connected to the ambient atmosphere through a narrow pressure equalizing channel. The microphone comprises an additional cavity representing an additional acoustic capacitance and an additional pressure equalizing channel located in series therewith and representing an additional acoustic resistance, the second capacitance and the second resistane being located in series with the capacitance and resistance, respectively, of the first cavity and the first channel in such a manner, that the pressure equalization of the microphone is also effected through the additional pressure equalizing channel and the additional cavity. According to the invention the additional pressure equalizing channel is dimensioned in such a manner that it substantially only provides a static pressure equalization.

REFERENCES:
patent: 2852620 (1958-09-01), Schoeps et al.
patent: 3007012 (1961-10-01), Olson
patent: 3944756 (1976-03-01), Lininger
patent: 4117275 (1978-09-01), Miyanaga et al.
patent: 4170721 (1979-10-01), Ishibashi et al.

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