US PATENT SUBCLASS 381 / 71.9
.~.~ Nonacoustically derived reference signal

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

71.1  DF  ACOUSTICAL NOISE OR SOUND CANCELLATION {7}
71.8  DF  .~ Counterwave generation control path {5}
71.9.~.~ Nonacoustically derived reference signal

DEFINITION

Classification: 381/71.9

Non-acoustically derived reference signal:

(under subclass 71.8) Subject matter in which a transducer used to obtain a signal for processing detects a form of energy other than sound vibration.

(1) Note. Examples are spark timing, crankshaft position, manifold pressure of an engine, etc.