Telephone receiver transmitter device

Details Telephone receiver transmitter device Telephone receiver transmitter device

1988-11-18

1990-05-29

Schreyer, Stafford D.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379420, 379430, 439166, 439174, H04R 106

Patent

active

049301560

ABSTRACT:
A telephone speaker/microphone device for suspending in a user's ear to enable hands-free communication without common occurrence of feedback. The device utilizes control circuitry capable of interconnecting microphone and speaker leads from a telephone or other communicating device to a speaker element and microphone element which are embodied in a single earpiece and suspended at the user's ear. The speaker element and microphone element are positioned sufficiently close and are wired such that the speaker signal is approximately 180 degrees out of phase with the microphone signal and results in cancellation of feedback by virtue of the out of phase relationship. This device and method are particularly useful in communication devices which utilize a side tone electronically transmitted from the microphone into the speaker element at the user's ear. Such side tone signal can be utilized in an out-of-phase relationship to cancel ambient feed back which has historically prevented close proximate use of microphone and speaker elements.

REFERENCES:
patent: 1557686 (1925-10-01), Hagerup
patent: 3317880 (1967-05-01), Meyer
patent: 4588867 (1986-05-01), Konomi

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