Electronic ausculscope

Details Electronic ausculscope Electronic ausculscope

1986-07-30

1988-03-15

Ng, Jin F.

Electrical audio signal processing systems and devices

Stethoscopes, electrical

128715, A61B 704

Patent

active

047318490

ABSTRACT:
A battery source of dc voltage continuously energizes digital circuitry for controlling operation of analog signal processing circuitry including a microphone preamplifier, an automatic gain control amplifier, a bandpass section and an output buffer driving audio reproducing equipment. The analog signal processing circuitry is energized on select command from the battery source through a switched on power supply. Automatic operation of the gain control amplifier may be disabled and the bandpass section by-passed in response to other select commands.

REFERENCES:
patent: 3396241 (1968-08-01), Anderson
patent: 3539724 (1970-11-01), Keesee
patent: 3651798 (1972-03-01), Egli
patent: 4226248 (1980-10-01), Manoli
patent: 4528690 (1985-07-01), Sedgwick
patent: 4546777 (1985-10-01), Groch
patent: 4618986 (1986-10-01), Hower
patent: 4628939 (1986-12-01), Little

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