US PATENT SUBCLASS 367 / 101
.~.~ Frequency modulation

Current as of: June, 1999
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367 /   HD   COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES

87  DF  ECHO SYSTEMS {6}
99  DF  .~ Distance or direction finding {5}
101.~.~ Frequency modulation {1}
102  DF  .~.~.~> Linear modulation (e.g., sawtooth)

DEFINITION

Classification: 367/101

Frequency modulation:

(under subclass 99) Subject matter in which the frequency of the transmitted acoustic waves is varied repetitively.