In-band signal receiver

Details In-band signal receiver In-band signal receiver

1975-12-22

1977-05-24

Claffy, Kathleen H.

H04M 150

Patent

active

040257304

ABSTRACT:
A multifrequency signal receiver for an in-band audio frequency signalling system uses Discrete Fourier Transform or Fast Fourier Transform processing techniques or a combination of both to reliably detect which signalling frequencies have been received. The system has the advantages of digital signal processing without the scale of arithmetic functions ordinarily associated with such processing.

REFERENCES:
patent: 3636446 (1972-01-01), Genter
patent: 3652805 (1972-03-01), Wisner
patent: 3679882 (1972-07-01), McAuliffe

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