04737713 is referenced by 19 patents and cites 5 patents.

An apparatus and method for processing a first electrical signal having a frequency interval I containing information, and increasing the signal-to-noise ratio thereof utilizes a mixer for shifting the frequencies of the first signal in the interval I to an interval I.sub.s. A plurality of filters, coupled in parallel, to the mixer pass, respectively, only frequencies in subintervals of I.sub.s, which are mutually disjoint. A second embodiment utilizes a plurality of mixers which shift, respectively, mutually disjoint subintervals of I such that their left end points are substantially equal. A plurality of filters, coupled, respectively, to the mixers, pass, respectively, only those frequencies in the shifted subintervals. Preferably, the frequency intervals passed by the filters in both embodiments are equal in bandwidth, and have no gaps therebetween.

Title
Apparatus and method for processing an electrical signal and increasing a signal-to-noise ratio thereof
Application Number
6/935279
Publication Number
4737713
Application Date
November 26, 1986
Publication Date
April 12, 1988
Inventor
Guo Ping Zhang
New York
NY, US
Raymond V Damadian
Woodbury
NY, US
Jan V Votruba
Port Jefferson Station
NY, US
Gordon T Danby
Wading River
NY, US
Agent
Lerner David Littenberg Krumholz & Mentlik
Assignee
Fonar Corporation
NY, US
IPC
G01R 33/20
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