Apparatus for transmitting and receiving pulses

Details Apparatus for transmitting and receiving pulses Apparatus for transmitting and receiving pulses

1976-10-12

1978-11-28

Claffy, Kathleen H.

179 15A, H04B 158

Patent

active

041277503

ABSTRACT:
The present invention relates to an apparatus for transmitting and receiving coded telephone pulses. This apparatus includes a modulation channel and a demodulation channel which are connected to a telephone instrument via a subscriber line and a duplexer, including an operational amplifier, for separating the transmitted and received signals. The demodulation channel of this apparatus comprises a demodulator whose output is connected to an active demodulating filter of the Sallen-Key type having a low-pass-type response curve adapted to compensate the distortion resulting from the demodulation.

REFERENCES:
patent: 2950361 (1960-08-01), Geiser
patent: 3180947 (1965-04-01), Haselton
patent: 3480742 (1969-11-01), Gaunt
patent: 3586881 (1971-06-01), Gaunt
patent: 3603744 (1971-09-01), Krasin

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