Monolithically integratable telephone circuit for generating con

Details Monolithically integratable telephone circuit for generating con Monolithically integratable telephone circuit for generating con

1985-06-19

1988-01-19

Dwyer, James L.

Telephonic communications

With usage measurement

Call charge metering or monitoring

H04M 1520

Patent

active

047208520

ABSTRACT:
A telephone circuit which may be monolithically integrated for generating control signals for displaying the telephone charges to a subscriber is coupled to an AC voltage signal generator of having a predetermined amplitude and frequency which are constant over time. The circuit includes a voltage generator for generating signals which are spaced over time and have a trapezoidal pulse waveshape. A multiplier circuit calculates the product of the signals supplied from the two voltage generators and supplies a signal which is sent to the speech circuit of the subscriber's line and is added to the speech signals. The trapezoidal pulse generator has a capacitor which is charged and discharged by a voltage to current converter of a non-linear type which is driven by exchange control components. The voltage across this capacitor forms the trapezoidal signals supplied by the generator. The converter supplies a current which is proportional to the voltage supplied to its input terminals for voltage values lying between two predetermined threshold values which are opposite in sign and have an identical absolute value. For voltage values beyond the threshold values, a constant current is supplied irrespective of input voltage variations.

REFERENCES:
patent: 4122308 (1978-10-01), Weinberger et al.
patent: 4264956 (1981-04-01), Delaney
patent: 4410765 (1983-10-01), Hestad et al.

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