Apparatus and method for modifying a speech waveform to compensa

Details Apparatus and method for modifying a speech waveform to compensa Apparatus and method for modifying a speech waveform to compensa

1989-11-14

1993-12-28

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 46, 381 48, 381 682, 381 684, G10L 500

Patent

active

052747115

ABSTRACT:
An apparatus and method for modifying a speech waveform using sinusoidal speech model parameters, includes finding a net masked threshold for each sinusoid for a normal-hearing subject, and adding the effects of impairment and obtaining an impaired masked threshold. The method also includes finding gain needed for each sinusoid so that its distance above the impaired masked threshold is equal to the distance above normal masked threshold, and multiplying sinusoid amplitudes by the gain. The sinusoidal model is used to address the problem of spread of masking within internal speech components by determining the amount of masking that occurs between surrounding sinusoids. The masked threshold for each sinusoid is determined based on the additive effects of masking by other sinusoids in each frame. The method compensates for recruitment by a transformation to determine how much each sinusoidal amplitude must be amplified in order to maintain the loudness relationships between sinusoids and their masked threshold in the normal-hearing and hearing-impaired domains.

REFERENCES:
patent: 4099035 (1978-07-01), Yanick
patent: 4508940 (1985-04-01), Steeger
patent: 4860360 (1989-08-01), Boggs

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