Circuit for a flash stroboscope for examining vocal chord functi

Details Circuit for a flash stroboscope for examining vocal chord functi Circuit for a flash stroboscope for examining vocal chord functi

1986-10-10

1989-02-21

Salce, Patrick R.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

128773, 315241S, A61B 126, G10L 904

Patent

active

048072915

ABSTRACT:
A circuit for a flash stroboscope for examining vocal chord functions has a number of band-pass filters connected in parallel which have different cut-off frequencies. The acoustic signal generated by the vocal chords is fed to the inputs of these filters as an electrical signal after conversion in an electro-acoustic transducer. The output signal or fundamental wave signal allowed to pass by filter with a fundamental frequency of interest for the examination is supplied to a lamp circuit, which activates a flash lamp by trigger pulses generated from the fundamental wave. The band-pass filters are scanned automatically and successively to determine the presence of an output signal having the fundamental frequency of interest. The scanning operation is stopped upon detection of an output signal of this frequency at one of the filter outputs, so that the output of this filter can be connectd to the lamp circuit. The scanning operation is repeated cyclically so that the circuit can always be updated to the existing condition in the event of possible changes of the fundamental wave frequency.

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