Audio processing device comprising reduced artifacts

An unnatural signal and audio processing technology, applied in speech analysis, instruments, hearing aids, etc., to achieve the effect of optimizing noise reduction

Active Publication Date: 2014-06-18
OTICON
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  • Audio processing device comprising reduced artifacts
  • Audio processing device comprising reduced artifacts
  • Audio processing device comprising reduced artifacts

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[0107] figure 1A prior art noise reduction system is shown, eg for forming part of an audio processing device such as a hearing instrument. figure 1 Components of a noise reduction system for reducing noise in an input audio signal x(n) and providing an enhanced output signal z(n) are schematically shown. The index n is the time index of the time difference of the implied signal. The noise reduction system is configured to compare the characteristics of the noisy (unprocessed) input signal x(n) and the characteristics of the noise-reduced signal z(n) to determine to what extent music is present in the noise-reduced signal noise. Changes in signal kurtosis were found to be robust predictors of musical noise. Based on this measure, it is proposed in EP 2 144 233 A2 to adjust parameters of the noise reduction algorithm (eg maximum attenuation) in order to reduce the amount of musical noise (at the expense of reduced noise reduction). The time-varying signals x(n) and z(n) are...

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Abstract

The invention discloses an audio processing device comprising reduced artifacts. The audio processing device comprises a forward path and an analysis path. The forward path comprises an input unit for conveying a time-varying electrical input signal representing an audio signal, a signal processing unit for applying a processing algorithm on the electrical input signal and providing a processed signal, and an output unit for transmitting an output signal on the basis of the processed signal; and the electrical input signal comprises a target signal part and a noises signal part. The analysis path comprises a model unit comprising a perceptual model of a human auditory system and providing audibility measurement, an artifact identification unit for identifying the artifacts introduced by the processing algorithm to the processed signal and providing the artifact identification measurement, and a gain control unit for controlling a gain of a signal, which is applied by the processing algorithm to the forward path, on the basis of inputs from the model unit and the artifact identification unit. The audio processing device has the advantage of dynamic optimization of noise reduction aiming at audibility of the artifacts.

Description

technical field [0001] The present application relates to audio processing devices, in particular to the identification of artifacts caused by processing (such as noise reduction) algorithms in audio processing devices and to the reduction of musical noise. The invention relates in particular to an audio processing device comprising a forward path for processing an audio signal, the processing comprising applying a processing (eg noise reduction) algorithm to the signal of the forward path. [0002] The invention also relates to the use of the aforementioned device and a method of operating an audio processing device. The invention also relates to a data processing system comprising a processor and program code causing the processor to carry out at least some of the steps of the method of the invention. [0003] For example, embodiments of the present invention may be used in the following applications: hearing aids, headphones, headsets, active ear protection systems, hands-...

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Application Information

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IPC IPC(8): H04R25/00
CPCG10L25/18G10L2021/02085H04R3/002G10L21/0208G10L25/51
Inventor J·延森M·S·佩德森
Owner OTICON
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