Speech circuit configuration

Details Speech circuit configuration Speech circuit configuration

1987-09-30

1989-07-11

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

Amplifying

379387, 379413, H04M 100, H04M 1900

Patent

active

048478989

ABSTRACT:
An electronic speech circuit configuration includes first and second line terminals to be connected to a telephone line. An AC circuit portion includes a modulator circuit for generating a line transmission current. A DC circuit portion supplies energy and generates a DC current/voltage characteristic curve. The DC circuit portion includes a reference potential source and a decoupling capacitor. A current sensing resistor is provided. A high-speed control amplifier has a control circuit and controls current through the current sensing resistor. A buffer capacitor is provided. Output terminals are connected to the buffer capacitor for the connection of external components. The DC circuit portion also includes a current toggle circuit connected upstream of the buffer capacitor. The current for feeding the buffer capacitor flows through the current sensing resistor connected to the first line terminal. The DC circuit portion and the AC circuit portion are connected in the control circuit of the high-speed control amplifier.

REFERENCES:
patent: 4626626 (1986-12-01), Coulmance
patent: 4639551 (1987-01-01), Kaire
Philips Specification TEA 1060, TEA 1061, Jul. 1983 pp. 394-406.

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