Frequency-selective signal receiver for communication equipments

Details Frequency-selective signal receiver for communication equipments Frequency-selective signal receiver for communication equipments

1973-09-20

1976-01-13

Claffy, Kathleen H.

H04M 150

Patent

active

039327086

ABSTRACT:
In a frequency-selective signal receiver for receiving at least two multi-frequency group codes and equipped with a voice-frequency trap, a broad-band frequency detector and a narrow-band frequency detector are connected in series parallel relative to the frequency coded input signal whereby the receiver channels of the narrow-band frequency detector provided for each single frequency of interest are activated when a conicidence between signals of two groups occurs. Due to the short transient response time of the broad-band frequency detector, character recognition is possible after a short time. The narrow-band frequency detectors are individually adjustable so that in the signal receiver particularly threatened frequency channels can correspondingly be taken into account.

REFERENCES:
patent: 3128349 (1964-04-01), Boesch et al.
patent: 3582562 (1971-06-01), Sellari
patent: 3582565 (1971-06-01), Beeman et al.
patent: 3770900 (1973-11-01), Morlec
patent: 3812432 (1974-05-01), Hanson

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