Light emission switching circuit for larynx stroboscope

Details Light emission switching circuit for larynx stroboscope Light emission switching circuit for larynx stroboscope

1985-07-18

1986-10-14

Grieb, William H.

Surgery

Truss

Perineal

315241S, 356 23, A61B 100, G01P 340

Patent

active

046166360

ABSTRACT:
A light emission switching circuit for use in a larynx stroboscope in which switching between a mode in which a stroboscopic lamp is flashed in synchronism with vibration of vocal cords and a mode in which the lamp is flashed at a fixed frequency is effected quickly in such a manner that there is no gap in light output at the time of switching. A detection output signal is produced when the frequency of a vocal cords vibration signal falls below a predetermined frequency, typically, about 50 Hz. When this signal is present, a switch circuit is controlled so as to connect the output of a fixed-frequency oscillator to drive the stroboscope. When the signal is absent, a pulse signal synchronous with the vocal cords vibration signal is employed to drive the stroboscopic lamp.

REFERENCES:
patent: 3026449 (1962-03-01), Rappaport

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