Frequency shift real-time loudness compensation method based on equal loudness curve

A technology of equal loudness curve and loudness compensation, which is applied in the field of hearing aids, can solve the problem of no loudness compensation and achieve the effect of ensuring the perception ability

Pending Publication Date: 2020-10-09
欧仕达听力科技(厦门)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of frequency shifting system does not do loudness compensation for frequency points, and some only compensate for the original ability. The loudness of the signal is a subjective feeling, which is greatly affected by the frequency.

Method used

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  • Frequency shift real-time loudness compensation method based on equal loudness curve
  • Frequency shift real-time loudness compensation method based on equal loudness curve
  • Frequency shift real-time loudness compensation method based on equal loudness curve

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] like figure 1 As shown in the GBT4963-2007 standard equal loudness level curve, the abscissa indicates frequency (Hz), and the ordinate indicates sound pressure level (dBSPL). Each curve indicates the same loudness level, and the unit is square (Phon). Depend on figure 1 It can be seen that the bottom dotted line is 0phon, indicating the standard audible range under normal hearing. As the sound intensity increases, the loudness level also increases until t...

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Abstract

The invention relates to the technical field of hearing aids. The invention particularly relates to a frequency shift real-time loudness compensation method based on an equal loudness curve. The method comprises the following steps: outputting N frequency bands of an input signal through a WOLA analysis window, calculating frequency shift parameter inflection point frequency and cut-off frequency,acquiring frequency shift step length according to the selected inflection point frequency and cut-off frequency, acquiring a non-frequency shift signal and a frequency shift signal according to theinflection point frequency, namely the compression ratio, calculating the sound pressure level of each frequency band of the frequency shift signal and the channel index of the original signal frequency in real time through a sound pressure level detection device, making the frequency shift signal pass through a frequency shift device to obtain a frequency-shifted signal and a target channel indexthereof, searching an equal loudness curve array to obtain a signal sound pressure level index so that a compensated frequency shift signal is formed, and synthesizing the compensated frequency shiftsignal and the non-frequency shift signal to form a hearing aid output signal. According to the invention, the frequency shift hearing aid can simply and effectively ensure that a wearer has the perception ability before and after signal frequency shift in any environment.

Description

technical field [0001] The invention relates to the technical field of hearing aids, in particular to a frequency-shifting real-time loudness compensation method based on equal loudness curves. Background technique [0002] A hearing aid is a small loudspeaker that amplifies the originally inaudible sound, and then uses the residual hearing of the hearing-impaired to send the sound to the auditory center of the brain so that the sound can be felt. It is mainly composed of five parts: microphone, amplifier, earphone, power supply and volume control. Hearing aids are divided into air conduction hearing aids and bone conduction hearing aids according to the conduction method; according to the use method, they are classified into box type, glasses type, hairpin type, behind-the-ear type, in-ear type, ear canal type, and deep ear canal type hearing aids. [0003] In order to solve the hearing problems of patients with severe and extreme sensorineural hearing loss, many manufactu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L25/03G10L25/51H04N21/439H04R25/00
CPCG10L25/03G10L25/51H04N21/439H04R25/48
Inventor 朴志刚郑康丽徐鹏程
Owner 欧仕达听力科技(厦门)有限公司
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