Noise cancelling apparatus for a telephone handset

Details Noise cancelling apparatus for a telephone handset Noise cancelling apparatus for a telephone handset

1990-05-15

1993-08-24

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379433, 379419, 381 91, H04M 103

Patent

active

052395782

ABSTRACT:
An improved noise cancelling apparatus is disclosed combining a unique directional noise cancelling microphone structure with a noise reducing, signal shaping electronic circuit. The microphone structure simultaneously receives two input signals; a first signal containing only ambient noise and a second signal containing both ambient noise and a voice signal. The microphone structure cancels the two noise components and transmits the voice signal into an electrical signal. The electronic circuit further processes the electrical signal to suppress any noise components not cancelled by the microphone structure. The electronic circuit also functions to enhance the high frequency components of the voice signal to provide a richer, more pleasant sounding output. Because the unique microphone structure is combined with the electronic circuit the noise cancelling apparatus of the present invention provides a cleaner, more pleasant sounding output than that of the prior art.

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patent: 4908855 (1990-03-01), Ohga et al.
patent: 4984268 (1991-01-01), Brown et al.

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