Apparatus for detecting in-band signalling signals

Details Apparatus for detecting in-band signalling signals Apparatus for detecting in-band signalling signals

1977-12-19

1979-10-02

Brown, Thomas W.

H04M 150

Patent

active

041699696

ABSTRACT:
An apparatus comprising a stopband filter, a linear amplifier, a limiter circuit, a narrow band filter and a threshold circuit, insensitive to voice signals. When signalling signals are emitted with two frequencies, the apparatus comprises two channels each of them being protected by an input reject filter against one of the signalling frequencies.

REFERENCES:
patent: 3103558 (1963-09-01), Ligotky
patent: 3582565 (1971-06-01), Beeman et al.
patent: 3836727 (1974-09-01), Hillekens
patent: 4092499 (1978-05-01), Lofmark

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