Frequency shift compression method suitable for digital hearing aid
A compression method and hearing aid technology, applied in hearing aids, electrical components, etc., can solve problems such as speech energy changes, affecting patients' speech recognition, changing speech clarity and intelligibility, etc., to compensate speech energy loss and improve recognition effect on intelligibility
Active Publication Date: 2015-09-09
SHENZHEN MICRO & NANO INTEGRATED CIRCUITS & SYST RES INST +1
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(3) It is related to the acoustic physical characteristics of consonants in speech. Most of the center frequencies of unvoiced consonants are above 4khz. Since it is difficult for hearing aids to achieve a gain of more than 20dB at high frequencies, 35% of important speech is concentrated above 2khz. Speech comprehension is difficult to improve by magnification alone
(4) Acoustic diffusion masking characteristics, which determine that low-frequency sounds have more masking properties for high-frequency sounds. Due to low-frequency amplification, high-frequency amplification is not large, resulting in the masking of vowels to consonants and the decline in speech discrimination.
[0004] The early researches were mainly pure frequency compression, proportional and non-linear methods, which greatly changed the clarity and intelligibility of the speech. At the same time, the speech energy after compression was greatly changed, which also affected the patients' perception of speech. identification
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[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.
[0027] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of ill...
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The invention provides a frequency shift compression method suitable for a digital hearing aid. The method comprises a step 101 of determining a high frequency loss degree of a patient, and acquiring a frequency range needed to be compressed and a target frequency range; a step 103 of preprocessing voice; a step 105 of computing a compression ratio p according to the frequency range needed to be compressed and the target frequency range, and performing frequency signal compression with the compression ratio of (p+1); a step 107 of performing symmetrical processing and N point IFFT transformation; and a step 109 of performing overlap-add on the recovery voice and a previous frame of signal, and performing automatic gain compensation on an output signal. Through adoption of the frequency shift compression method suitable for the digital hearing aid, the voice information of a target frequency band is maintained, furthermore, the high frequency band needed to be compressed can be compressed, so that the identification and intelligibility of the voice are better improved, and voice energy loss caused by frequency shift is compensated.
Description
technical field [0001] The invention relates to hearing aid technology, in particular to a frequency shift compression method suitable for digital hearing aids. Background technique [0002] The frequency shift compression algorithm is one of the most important algorithms in digital hearing aids, especially for those with sensorineural hearing loss. Hearing aids mainly amplify speech (single or multi channels). However, for patients with sensorineural hearing loss, they generally have relatively small low-frequency loss but high high-frequency loss. When the loss reaches 60-70dB or more, it cannot meet the demand if only the high frequency is compensated. The reasons are as follows: (1) At present, the amplitude amplification gain and frequency bandwidth of general hearing aids are limited by the performance of the microphone and speaker, and the compensation gain can generally only reach about 60db. (2) When the patient loses more than 60dB at high frequencies, the audibl...
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Inventor 郭朝阳王新安张国新赵志良罗香香薛峰杰王丹
Owner SHENZHEN MICRO & NANO INTEGRATED CIRCUITS & SYST RES INST