Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent
1997-12-18
1999-11-30
Chiang, Jack
Telephonic communications
Substation or terminal circuitry
For loudspeaking terminal
379394, 379395, H04M 100
Patent
active
059956194
ABSTRACT:
A telephony device includes a rectifier bridge (GB) intended to be connected to a telephone line and to supply a rectified line current, an interface module (INT) permitting the transmission of signals in the direction of the telephone line and supplying an information signal (Iin), and an amplifier (AGC) whose gain is proportional to the value of a control current (Icnt) supplied by a control module (CNT). The control current (Icnt) is proportional to an exponential of a linear equation of the inverse of the value of the information signal (Iin) in order to compensate for the attenuation which the signal has undergone during its transport through the telephone line. The control module is formed by a translinear module (TRL) which receives the input signal (Iin) and produces a translinear current (Itr) whose value may be expressed in the form of a linear equation of the inverse value of the input signal (Iin), and an exponential module (EXP) which receives the translinear current (Itr) and produces the control current (Icnt) whose value may be expressed as proportional to an exponential of the value of the translinear current (Itr).
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Bailly Patrick
Delbecq Dominique
Chiang Jack
Slobod Jack D.
U.S. Philips Corporation
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