Telephonic communications – Private or single line system – Doorbell system
Patent
1996-02-27
1999-08-17
Kuntz, Curtis A.
Telephonic communications
Private or single line system
Doorbell system
379389, 379390, 381 57, 381110, H04M 160
Patent
active
059404868
ABSTRACT:
A bidirectional communication channel provides communication across a sound proof wall used, for example in a ticket booth. Normally communication from outside into the booth is muted by inhibiting the gain of a listen channel to a preselected percentage of its maximum gain level. After an attendant talks into an internal microphone, the muting is temporarily inhibited and normal communication is allowed between an attendant and a customer. After the conversation is completed, the system reverts back to a muted operational mode.
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Kuntz Curtis A.
Norcon Communication, Inc.
Tieu Binh K.
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