Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent
1997-10-28
1999-04-27
Hunter, Daniel S.
Telephonic communications
Substation or terminal circuitry
For loudspeaking terminal
379156, 379212, 379420, 379392, H04M 158, H04M 160
Patent
active
058987738
ABSTRACT:
A telephone apparatus is connected to a plurality of telephone lines and has a transfer function for transferring a call among the plurality of telephone lines. The telephone apparatus includes circuit interfaces each of which has a 2-4 line substitution function and conducts an interface function between each of the plurality of telephone lines and a telephone apparatus internal circuit. A first amplifier amplifies a signal from a first telephone line and a second amplifier amplifies a signal from a second telephone line. A control unit compares the levels of the signals from the first and second telephone lines to control the amplification factors of the first and second amplifiers on the basis of a result of the comparison.
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patent: 5692042 (1997-11-01), Sacca
Kikuchi Kenichi
Tsunoda Kazunari
Yamamoto Kouichi
Appiah Charles N.
Frank Robert J.
Hunter Daniel S.
Matsushita Electric - Industrial Co., Ltd.
Wood Allen
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