Noise canceling transmitter

Details Noise canceling transmitter Noise canceling transmitter

1981-12-23

1984-07-31

Pellinen, A. D.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

179103, 179179, 179188, 381 94, H04M 119

Patent

active

044632223

ABSTRACT:
Noise canceling transmitter for voice communications comprising a casing having a principal surface opposed to the mouth of the user and three side surfaces facing upwardly, laterally and downwardly when the principal surface is so opposed. Noise canceling openings in the three side surfaces communicate noise to the back of a diaphragm in the transmitter microphone. Openings in the principal surface communicate both noise and the speaker's voice to the front of the diaphragm. The noise acts on both sides of the diaphragm and is thus canceled, while the voice acts only on one side of the diaphragm and vibrates it.

REFERENCES:
patent: 3830988 (1974-08-01), Mol et al.
patent: 4288663 (1981-09-01), Foley

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