Education and demonstration – Language – Speech
Patent
1996-10-02
1999-04-20
Cheng, Joel H.
Education and demonstration
Language
Speech
434156, 381150, 704200, H04R 312
Patent
active
058952209
ABSTRACT:
An audio frequency converter apparatus which includes an input amplifier, first threshold sensor, connected to an output of the input amplifier, for cutting off a voltage supplied by the input amplifier at a threshold, after rectification, and second threshold sensor, connected to the output of the input amplifier, for adding at a threshold the voltage supplied by the input amplifier after rectification. The second threshold sensor has a time constant which is at least equal to that of the first threshold sensor. A voltage controlled oscillator is connected to the output of the first threshold sensor to provide an oscillating output having a frequency that decreases with an increase in the output of the first threshold sensor. A modulator having first and second inputs respectively connected to the outputs of the second threshold sensor and the voltage controlled oscillator is provided to supply the parametric signal oscillating with the frequency of the first input to the modulator with an envelope amplitude that increases with an increase in the second input. A variator is provided for varying at least one of the characteristics of a group formed by the amplitude and the frequency of the parametric signal, as a function of at least one of the characteristics of the group formed by the logarithm of the amplitude and of the frequency of the audio frequency signal.
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Beller Isi
Fradin Boris
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