Adaptive telephone receive control
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 16, 1989
Grant Date -
N/A
app pub date -
May 16, 1988
filing date -
May 16, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A paystation telephone level control system is disclosed including a telephone receiver driven by a local amplifier and wherein two sets of attenuating resistors, a coarse attenuation set and a fine attenuation set, interface with connectable terminals of a binary control crosspoint switch. The presence or absence of coin tones and dialing tones are detected and the crosspoint switch discretely controlled by their presence to effect discrete levels of attenuation of signals fed to the receiver. In addition, the lever of attenuation during voice communications is a function of a pre-adjusted attenuation and a user selection.
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Family
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Cited Art Landscape
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