US PATENT SUBCLASS 367 / 121
.~.~ By electrical means

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

118  DF  DISTANCE OR DIRECTION FINDING {6}
119  DF  .~ With beam steering, scanning, or focussing {2}
121.~.~ By electrical means {2}
122  DF  .~.~.~> Transducer switching or gating
123  DF  .~.~.~> With phase shifter or delay means

DEFINITION

Classification: 367/121

By electrical means:

(under subclass 119) Subject matter wherein the directional characteristics are varied or concentrated by varying some functional characteristic of the electrical circuitry associated with the transducer.

(1) Note. Subject matter of this subclass type may consist of, for example, a plurality of transducers whose directions of maximum sensitivity do not coincide and which are connected to common signal processing circuitry in such a way that signals from individual transducers may be selectively attenuated to thereby effectively increase the sensitivity of the whole receiver in directions corresponding to the directions of maximum sensitivity of the transducer whose signals are unattenuated.