Patent
1976-01-06
1977-09-20
Stellar, George G.
179 1HF, 179 1VC, H04M 910
Patent
active
040499111
ABSTRACT:
There is disclosed a compact battery-powered, self-contained talk-through unit for passing voice communications through a partition. Typically, the unit is installed in a window partition separating an attendant from the public. Facing the outside of the unit area a microphone and a speaker. Facing the inside, a speaker is mounted within the unit and a microphone is contained at the end of a gooseneck connector. In the quiescent condition, speech from the outside is level-compressed and heard on the inside; speech on the inside, e.g., between two attendants, is not amplified and heard on the outside. It is only when an attendant talks within approximately 2 inches of the gooseneck microphone that the outside-to-inside amplification is turned off and the inside-to-outside amplification is turned on. In this way, the attendant has complete, hands-free control of voice communications; there is no competition between talkers and there is no acoustic feedback.
REFERENCES:
patent: 3071647 (1963-01-01), Grant
patent: 3751602 (1973-08-01), Breeden
patent: 3849603 (1974-11-01), Proids
Maltese Mario
Schlaff Norman
Norcon Electronics Inc.
Stellar George G.
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