Method for the binaural left-right localization for hearing instrument

A technology for hearing aids and useful signals, applied in hearing aids, hearing aid signal processing, microphones, etc., to solve problems such as reducing interference noise

Active Publication Date: 2012-11-14
SIVANTOS PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the above-mentioned technical problem by considering it as a classical interference noise reduction problem

Method used

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  • Method for the binaural left-right localization for hearing instrument
  • Method for the binaural left-right localization for hearing instrument
  • Method for the binaural left-right localization for hearing instrument

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Embodiment Construction

[0026] figure 1 Signals for a ring are shown, i.e. for a signal source positioned in the spatial direction of the described ring, the left ear side (indicated with reference L2 in the figure) and the right ear side of a binaural hearing aid arrangement at 1 kHz The level of the hearing aid microphone or microphone unit on the side (reference L1). A difference of 6-10dB can be discerned, i.e. for the left signal (270°) the level L2 of the microphone or microphone arrangement on the left is higher than the level L16-10dB of the microphone or microphone arrangement on the right; at higher frequencies In the case of , the level difference will be increased.

[0027] For example, if it is now desired to listen to the left (270°), the signal L1 on the right is used as an interference signal and the signal L2 on the left is used as a useful signal. On the basis of this interfering sound and the useful sound signal, input parameters for filtering, for example a Wiener filtering, can...

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Abstract

The invention relates to a method and a system for improving the signal-to-noise distance of output signals of a microphone system of two or more microphones due to acoustic useful signals occurring at the sides of the microphone system. Such a method and system can be used in hearing instruments, especially in hearing aids worn on the head of a hearing aid user. According to the invention, high and low frequency portions (cut-off frequency in the range between 700 Hz and 1.5 kHz, e.g. approx. 1 kHz) are processed differently. In low frequency ranges, a differential microphone signal which is directed towards left and one towards right is produced to determine the level of the lateral useful and noise sound using these two directional signals. These levels are used for a Wiener filtering and every microphone signal is subjected to an individual Wiener filtering. Additionally, the natural shadowing effect of the head can be used in high frequency ranges as a pre-filter for noise and useful sound estimation for a subsequent Wiener filtering. Every microphone signal is then subjected to Wiener filtering individually. The methods can e.g. be used in hearing instruments to be worn on the head individually for high or for low frequencies, but they can be also used in combination and complement each other in advantageous manner.

Description

technical field [0001] The invention relates to a method and a system for improving the signal-to-noise ratio in the output signal of a microphone arrangement of two or more microphones on the basis of acoustically useful signals occurring laterally of the microphone arrangement. Such methods and systems may be employed in hearing aid devices, particularly hearing aids worn on the head of a hearing aid wearer. Sides are to be understood here to mean, in particular, the right and left sides of the head of a wearer of a binaural hearing aid arrangement. Background technique [0002] Conventional directional methods used hitherto in hearing aids offer the possibility of emphasizing signals or noises arriving from the front or from behind of the hearing aid wearer from the rest of the ambient noise in order to improve speech intelligibility in this way. However, this method does not offer the possibility of highlighting signals or noise from lateral sources arriving from the le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R25/00
CPCH04R2430/21H04R2410/01H04R25/552H04R2225/43H04R25/407
Inventor E.费希尔
Owner SIVANTOS PTE LTD
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