The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 1989
Filed:
Oct. 10, 1986
Reiner Hoffmann, Illingen, DE;
Peter Jaggy, Oetisheim, DE;
Richard Wolf GmbH, , DE;
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.