Education and demonstration – Language – Speech
Patent
1985-07-18
1987-11-24
Pinkham, Richard C.
Education and demonstration
Language
Speech
434320, 381150, H04R 312
Patent
active
047086572
ABSTRACT:
Audio frequency converter apparatus, in particular for treating subjects suffering from audio-phonatory disorders, the apparatus being suitable for generating, on the basis of an input audio frequency signal, a parametric signal for application via an electro-acoustic transducer to a person being treated. Included in the apparatus are an input amplifier, a first threshold detector connected to the output from the input amplifier and subtracting a threshold voltage from the voltage supplied from the input amplifier, after rectification, a second threshold detector, likewise connected to the output from the input amplifier, and adding a voltage threshold to the signal from the input amplifier, after rectification, and having a time constant which is not less than the time constant to the first detector, a voltage controlled oscillator circuit connected to the output from the first threshold detector, and a (balanced) modulator whose two inputs are respectively connected to the outputs from the second threshold detector and from the oscillator circuit, and whose output provides the parametric signal.
REFERENCES:
patent: 3934092 (1976-01-01), Csicsatka et al.
patent: 4206417 (1980-06-01), Poulo
Beller Isi
Fradin Boris
Beller I.
Lastova MaryAnn Stoll
Pinkham Richard C.
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