Signal classifier

Details Signal classifier Signal classifier

1979-04-11

1980-10-07

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

455 67, 328140, 307233R, H04B 1700

Patent

active

042272556

ABSTRACT:
A signal classifier performs measurements on an IF signal and determines from these measurements the nature of the modulation, if any, appearing on a received high frequency communications signal. The classifier distinguishes between double sideband AM, single sideband suppressed carrier voice AM, ASK, FSK, multi-channel FSK, unmodulated carrier and noise. The measurements include AM variation, the zero crossing rate in detected AM, the percentage of time the detected AM signal level exceeds a given amplitude, and wide and narrow band detected FM.

REFERENCES:
patent: 3199030 (1965-08-01), Oxford et al.
patent: 3546585 (1970-12-01), Leibowitz et al.
patent: 3581220 (1971-05-01), Bell et al.
patent: 3588701 (1971-06-01), Kahn
patent: 3622877 (1971-11-01), MacDavid et al.
patent: 3688197 (1972-08-01), Kahn
patent: 3992670 (1976-11-01), Gittins et al.

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