Audio-frequency converter apparatus, installation including said

Details Audio-frequency converter apparatus, installation including said Audio-frequency converter apparatus, installation including said

1987-11-23

1990-01-23

Coven, Edward M.

Education and demonstration

Language

Speech

434320, 360 191, 3645135, 381150, H04R 312

Patent

active

048955191

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 amplifier, after rectification, a second threshold detector, likewise connected to the output from the input ampifier, 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 of 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: 4615680 (1986-10-01), Tomatis
patent: 4685448 (1987-08-01), Shames et al.
patent: 4708657 (1987-11-01), Beller et al.

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