Real-time audio spectrum analyzer

Details Real-time audio spectrum analyzer Real-time audio spectrum analyzer

1966-09-26

1981-06-23

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367901, G01S 1532

Patent

active

042754607

ABSTRACT:
A propeller modulation enhancement and display system which suppresses hull cho and displays propeller modulation of a return sonar signal in real time. The real-time operation is obtained through the use of a multichannel frequency spectrum analyzer having a plurality of narrow bandpass filters covering the frequency of interest. Suppression of the hull echo is obtained through the use of a narrow band-reject filter having a variable center frequency. The filter precedes the multichannel frequency spectrum analyzer.

REFERENCES:
patent: 2724817 (1955-11-01), Hisserich
patent: 3140461 (1964-07-01), McKinney

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