A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
349/36
A61B 10/00 (2006.01)
Patent
CA 1059612
ABSTRACT A method and apparatus for obtaining an audible signal containing information as to the characteristics of at least one moving element situated internally of a living body and in which a transmitting transducer fed with an electrically generated signal of supersonic frequency trans- mits stress waves through the body tissue to the moving element to be investigated, and a receiving transducer receives reflected waves and feeds a received electrical signal to a receiver containing a multiplier or other modulator for generating an output signal of difference frequency in the audible range, and the transmitting signal is subjected to frequency sweep and has a mean value and a sweep which produce frequency variations in the electrical difference signal arising from change of position of the element under investi- gation and motion of this element, the electrical difference signal being fed to a transducer for audible reproduction of a sound pattern representative of the variations of position and motion of the element.
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