Device for treating audio signals, especially for treating...

Details Device for treating audio signals, especially for treating... Device for treating audio signals, especially for treating...

2004-12-23

2008-03-25

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to digital conversion followed by digital to analog...

C341S100000

Reexamination Certificate

active

07348905

ABSTRACT:
A device for digital treatment of audio signals, especially for treating patients with audiophonatory disorders. The device includes an analog audiofrequency signal input, an analog-digital encoder, an envelope detector, a digital limiter, a multiplier, a synthesizer, and a digital-analog converter. The analog-digital encoder reflects an input analog audiofrequency signal by a first sequence of digital values; the envelope detector establishes, from the first sequence of digital values, a second sequence of digital values reflecting the envelope of the input audiofrequency signal; the digital limiter establishes a third sequence of defined digital values, from the second sequence of digital values; the multiplier establishes a sequence of modulated emission frequency values according to values of the third sequence of digital values; the synthesizer elaborates a digital audio signal from the sequence of emission frequency values; and the digital-analog converter produces an output analog signal from the digital audio signal.

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Apoux, Frederic et al., “Temporal envelope expansion of speech in noise for normal-hearing and hearing-impaired listeners: effects on identification performance and response times”, Hearing Research, vol. 153, No. 1/2, pp. 123-131, 2001.

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