Integrated circuit for the transmission of telephone signals

Details Integrated circuit for the transmission of telephone signals Integrated circuit for the transmission of telephone signals

1985-10-24

1988-07-05

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

Amplifying

379387, H04M 160

Patent

active

047560223

ABSTRACT:
An integrated circuit for the transmission of telephone signals is designed so as to be inserted in a speech circuit of a subscriber's telephone set and includes a threshold comparator having first and second input terminals coupled to the terminals of a two-wire telephone line and an output terminal connected to a point of the signal path of the circuit. The threshold of this comparator is set such that when the voltage at the terminals of the line drops to a predetermined value, which is not lower than the minimum voltage value required to ensure the correct operation of all the components of the circuit, it generates an output signal used to limit the amplitude of the negative peaks of the waveforms of the transmitted signals.

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patent: 4644579 (1987-02-01), Whittaker

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