Multi-frequency signal receiver

Details Multi-frequency signal receiver Multi-frequency signal receiver

1976-10-04

1978-03-21

Claffy, Kathleen H.

H04M 126

Patent

active

040805166

ABSTRACT:
A multi-frequency signal receiver includes a multi-operation digital filter for frequency discriminating digitalized multi-frequency signals from a plurality of push-phone type telephone sets. In order to enhance the efficiency of utility of the digital filter, a signal detection circuit is provided for each telephone channel to detect the beginning, the duration and the end of an input signal for controlling the connection between the telephone channel and the digital filter for a predetermined time period from the beginning of the signal in accordance with the result of the detection, whereby a time period during which the telephone channel occupies a specific filter channel is shortened.

REFERENCES:
patent: 3539731 (1970-11-01), Legedza

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