US PATENT SUBCLASS 708 / 409
.~.~.~.~ Butterfly circuit

Current as of: June, 1999
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708 /   HD   ELECTRICAL COMPUTERS: ARITHMETIC PROCESSING AND CALCULATING

100  DF  ELECTRICAL DIGITAL CALCULATING COMPUTER {10}
200  DF  .~ Particular function performed {26}
400  DF  .~.~ Transform {4}
403  DF  .~.~.~ Fourier {6}
409.~.~.~.~ Butterfly circuit

DEFINITION

Classification: 708/409

Butterfly circuit:

(under subclass 403) Subject matter wherein a specific apparatus performs a complex multiplication and a complex addition or subtraction.