Telephone circuit controlled by a 2 wire - 4 wire transmission i

Details Telephone circuit controlled by a 2 wire - 4 wire transmission i Telephone circuit controlled by a 2 wire - 4 wire transmission i

1982-11-15

1985-12-31

Schreyer, Stafford D.

179 90A, 179 90K, 179 77, 179 81B, H04M 131

Patent

active

045623090

ABSTRACT:
The telephone circuit of the invention comprises a transmission circuit short-circuited during decimal numbering by an active circuit when the handset is lifted or during the emission of a decimal numbering digit, the line current supplying, through a voltage stabilizing circuit and a voltage regulation circuit, the microprocessor controlling the telephone circuit.

REFERENCES:
patent: 4388499 (1983-06-01), Janssen

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