Receiver for detecting different fixed frequency signals on a te

Details Receiver for detecting different fixed frequency signals on a te Receiver for detecting different fixed frequency signals on a te

1987-09-02

1989-05-09

Brown, Thomas W.

Telephonic communications

Plural exchange network or interconnection

Interexchange signalling

328138, 379282, 379386, H04M 322, H04M 700

Patent

active

048295620

ABSTRACT:
A signalling receiver has its signal input (E) connected to a central-office trunk (a, b) in a trunk junctor and includes a variable bandpass filter (BP) connected to a clock line (TL). The signal input (E) is connected via an attenuator (DG) to a variable high-pass filter (HP) which is connected to the clock line (TL) and, via a signal evaluation and conversion unit (SE), to the bandpass filter (BP). A bandwidth switch (BU) is connected to the clock line (TL), the variable bandpass filter (BP), and the attenuator (DG). The cutoff frequency of the high-pass filter (HP) and the midband frequency of the bandpass filter (BP) are adjusted with a clock signal having a frequency related to the signal frequency to be received, the cutoff frequency being lower than the midband frequency.

REFERENCES:
patent: 4076965 (1978-02-01), Olsen et al.
patent: 4385208 (1983-05-01), Tow
patent: 4502049 (1985-02-01), Atlsiuson
patent: 4614909 (1986-09-01), Jarofalt
patent: 4626629 (1986-12-01), Premoli et al.

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