US PATENT SUBCLASS 342 / 196
.~.~ Fast fourier transform (FFT)

Current as of: June, 1999
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342 /   HD   COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)

175  DF  WITH PARTICULAR CIRCUIT {13}
195  DF  .~ Digital processing {2}
196.~.~ Fast fourier transform (FFT)

DEFINITION

Classification: 342/196

Fast fourier transform (FFT):

(under subclass 195) Subject matter including means to perform a fast fourier transform.

SEE OR SEARCH CLASS

708, Electrical Computers: Arithmetic Processing and Calculating,

403+, for digital computing of Fourier transforms and subclass 821 for analog computing of Fourier transforms.