Wide dynamic compression method of digital hearing aid based on sound pressure level segmentation

Abstract

The invention discloses a wide dynamic compression method of a digital hearing aid based on sound pressure level segmentation, wherein the wide dynamic compression method comprises the following steps: framing a voice signal, and filtering the framed signal through a 16-channelnonuniform spaced 6-order IIR decomposition filter bank; then, calculating the sound pressure levels of the voice signals of the channels, and obtaining a hearing compensation curve of a patient in combination with an audiogram of the patient; carrying out channel-separated hearing compensation on the patient according to the hearing compensation curve, integrating compensated multichannel signals to obtain a compensated useful signal, and providing the useful signal for the patient. The wide dynamic compression method disclosed by the invention has the beneficial effects that, the sound pressure level is thinned in 8 segments to obtain more accurate input / output curves; and the 6-order IIR decomposition synthesis filter bank conforming to human hearing characteristics can be used for obtaining a compensation gain value better conforming to the actual demand of the patient.

Description

technical field [0001] The invention relates to a wide dynamic compression method for a digital hearing aid, in particular to a wide dynamic compression method for a digital hearing aid based on sound pressure level segmentation. Background technique [0002] Loudness compensation technology is one of the core and most important functions of digital hearing aids. Its purpose is to compensate for the missing speech information of hearing-impaired patients and improve patients' understanding of speech content. On the one hand, the loudness compensation method should match the sound pressure level of the speech signal to the patient's auditory dynamic range according to the patient's hearing threshold, optimum threshold, pain threshold and dynamic range; Depending on the condition of hearing loss, the loudness compensation method also needs to perform different compensations for different frequency signals according to the frequency deficiency of the patient. At present, almos...

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Problems solved by technology

[0004] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a wide dynamic compression method for digital hearing aids based on sound pressure level segmentation, by subdividing the sound pressure level into eight segments, different input sound pressure level compensation can be achieved more easily Gain that meets the actual needs of patients, and solves the technical problems of poor hearing compensation methods for hearing aids in the prior art and difficult to meet the needs of patients

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