Device and method for direction dependent spatial noise reduction

A space and equipment technology, applied in the field of direction-dependent spatial noise reduction, which can solve problems such as inappropriate hearing aid configuration and sensitivity to the geometry of microphone arrays

Active Publication Date: 2012-11-07
SIVANTOS PTE LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Another technique for forming a spatial null in the desired direction is shown in , but

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  • Device and method for direction dependent spatial noise reduction
  • Device and method for direction dependent spatial noise reduction
  • Device and method for direction dependent spatial noise reduction

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Embodiment Construction

[0032] Embodiments of the invention discussed below provide apparatus and methods for direction-dependent spatial noise reduction, which can be implemented in, for example, figure 1 The binaural hearing aids shown are used in configuration 1. Configuration 1 comprises: a right hearing aid comprising a first pair of monaural microphones 2,3; and a left hearing aid comprising a second pair of monaural microphones 4,5. The left and right hearing aids are installed in the left and right ears of the user 6, respectively. The monaural microphone in each hearing aid is measured at a distance l 1 separated, due to size constraints, the distance l 1 For example, it may be approximately equal to 10 mm. The distance between the left and right hearing aids is l 2 Separate and connected by a two-way audio link 8, typically a wireless link. To minimize power consumption, only one microphone signal can be passed from one hearing aid to the other. In this example, the front microphones ...

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Abstract

The invention is related to a device and a method for reducing direction dependent spatial noise. The proposed device includes a plurality of microphones (2,3,4,5) for measuring an acoustic input signal (XR1,XR2,XL1) from an acoustic source (7). The plurality of microphones (2,3,4,5) form at least one monaural pair (2,3) and at least one binaural pair (2,4). Di not rectional signal processing circuitry (71,72,73,74) is provided for obtaining, from said input signal (XR1,XR2,XL1), at least one monaural directional signal [Y1,N1) and at least one binaural directional signal (Y2, N2). A target signal level estimator (76) estimates a target signal level (Fs) by combining at least one of said monaural directional signals (Y1) and at least one of said binaural directional signals (Y2), which at least one monaural directional signal (Y1) and at least one binaural directional signal (Y2) mutually have a maximum response in a direction of said acoustic source (7). A noise signal level estimator (75) estimates a noise signal level (FD) by combining at least one of said monaural directional signals (N1) and at least one of said binaural directional signals (N2), which at least one monaural directional signal (N1) and at least one binaural directional signal (N2) mutually have a minimum sensitivity in the direction of said acoustic source (7).

Description

technical field [0001] The invention relates to direction-dependent spatial noise reduction, eg for use in binaural hearing aids. Background technique [0002] For non-stationary signals, such as speech in complex auditory environments with multiple speakers, directional signal processing is crucial in order to improve speech intelligibility by enhancing the desired signal. For example, traditional hearing aids utilize simple differential microphones to focus on objects in front or behind the user. In many auditory situations, the desired speaker azimuth differs from these predetermined directions. Thus, direction signal processing that makes the focus direction steerable will be effective in enhancing the desired source. [0003] Recently, methods for binaural beamforming have been proposed. literature [0004] T. Rohdenburg, V. Hohmann, B. Kollmeier, “Robustness Analysis of Binaural Hearing Aid Beamformer Algorithms by Means of objective Perceptual Quality Measures,” i...

Claims

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Application Information

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IPC IPC(8): H04R25/00
CPCH04R2430/21H04R25/407H04R2201/401H04R2410/01H04R25/552H04R5/04
Inventor N.查特拉尼E.费舍尔
Owner SIVANTOS PTE LTD
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