US PATENT SUBCLASS 73 / 604
.~.~.~.~ Having means substituted for reference signal

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

570  DF  VIBRATION {10}
584  DF  .~ By mechanical waves {13}
596  DF  .~.~ Beamed {10}
603  DF  .~.~.~ Acoustic holography {2}
604.~.~.~.~ Having means substituted for reference signal

DEFINITION

Classification: 73/604

Having means substituted for reference signal:

(under subclass 603) Subject matter wherein the hologram is formed without an electronic or acoustic reference signal as by temporal reference, optical heterodyne, or optical homodyne techniques.