Selective calling decoder

Details Selective calling decoder Selective calling decoder

1984-03-27

1989-04-04

Cangialosi, Salvatore

Communications: electrical

Continuously variable indicating

With meter reading

34082574, 455 36, H04Q 700

Patent

active

048189898

ABSTRACT:
There is disclosed an aircraft selective calling decoder for decoding individual signal tones used in selectively signaling communication of a particular aircraft. The decoder is associated with a channel of receiving equipment in an aircraft and is responsive typically to a particular four-tone coded signal, the reception of which actuates the decoder indicating that an incoming communication is to be received. The decoder includes a dual path circuit which receives dual frequencies of each individual tone of the four-tone code and provides an output upon receipt of each tone for enabling the receiver following receipt of the proper four-tone code sequence. Filtering in each of the dual paths for each frequency of a tone is controlled by a microprocessor to eliminate the necessity for multiple individual filters.

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