Microphone output transmission circuit

Details Microphone output transmission circuit Microphone output transmission circuit

1981-06-16

1983-11-08

Rubinson, G. Z.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

179 81B, 381 92, 381113, H01M 160

Patent

active

044144334

ABSTRACT:
A microphone output transmission circuit for a capactive microphone such as an electret microphone employs a differential amplifier to provide a transformerless balanced connection to a microphone transmission line, either at the transmission end or at the reception end thereof. Power is applied in a phantom connection by superimposing a DC voltage on two balanced signal conductors of the transmission line, and using the shield thereof as a ground return line. A pair of microphones with oppositely-directed sound-gathering planes can be connected to respective inputs of a differential amplifier at the transmission end, so that the two microphones together have a bidirectional characteristic.

REFERENCES:
patent: 3899613 (1975-08-01), Tabalba
patent: 4002852 (1977-01-01), Martin
patent: 4007335 (1977-02-01), Hetherington et al.
patent: 4088813 (1978-05-01), Rogers et al.

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