Electronic stethoscope
First Claim
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1. An electronic stethoscope comprisinga phonocardio transducer for converting physical vibrations into corresponding alternating current electrical signals,frequency multiplier means for multiplying the frequency of said signals by a predetermined number and,reproducer means supplied with said frequency multiplied signals for audibly reproducing said frequency multiplied signals.
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Abstract
An electronic transducer in which the detected sounds are frequency multiplied to place them in a more favorable position for hearing within the auditory range, and in which lateral modulation by means of electrocardiogram signals is achieved to give a perception of physical space to the detected sounds.
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Citations
16 Claims
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1. An electronic stethoscope comprising
a phonocardio transducer for converting physical vibrations into corresponding alternating current electrical signals, frequency multiplier means for multiplying the frequency of said signals by a predetermined number and, reproducer means supplied with said frequency multiplied signals for audibly reproducing said frequency multiplied signals.
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11. An electronic stethoscope comprising
a phonocardio transducer for converting physical vibrations into corresponding alternating current electrical signals, electrocardio detection means for detecting and amplifying electrical signals generated within a patient by the patient'"'"'s heart, detection circuitry supplied with said detected and amplified heart electrical signals for detecting the QRS wave thereof and for producing a trigger control pulse in response thereto, stereophonic reproduction means supplied with the signals detected by the phonocardio transducer, for stereophonically, audibly reproducing such signals, the stereophonic reproduction means having left and right amplification channels whose outputs are independently modulated in response to left and right control signals, respectively, and a reciprocal wave generator supplied with the trigger control pulse for generating, in response thereto, left and right control signals, whose waveforms are inverted with respect to each other, for the stereophonic reproduction means whereby the amplified phonocardio signals shift from one reproduction channel to the other over the period of each heart beat.
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15. A method of electronically processing subaudile sound signals comprising the steps of
converting the sound signals to corresponding alternating current electrical signals, multiplying the frequency of such signals by an integer sufficient to place such signals in the frequency range of 100 Hz to 4000 Hz, amplifying the frequency multiplied signals, and audibly reproducing the frequency multiplied signals.
Specification