Apparatus and method for suppressing side lobe response in a...

Details Apparatus and method for suppressing side lobe response in a... Apparatus and method for suppressing side lobe response in a...

H - Electricity

03

M

354/67, 354/70

H03M 5/00 (2006.01) H01Q 3/26 (2006.01)

Patent

CA 1224878

Abstract of the Disclosure A decoder circuit is provided which employs digital sampling and correlation apparatus to detect the presence of a received tone signal exhibiting a predetermined frequency. Samples of received tone signals are taken and, in effect, multiplied by a substantially rectangular observation window which includes a bite interval of selected duration and location therein. A correlator correlates the windowed samples to detect samples corresponding to the predetermined frequency (main lobe frequency). A significant decrease in undesired side lobe response is thus achieved.

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