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Sound intelligibilty enhancement using a psychoacoustic model and an oversampled filterbank

A filter bank and psychoacoustic technology, applied in instruments, hearing aids, speech analysis, etc., can solve problems such as low energy, signal frequency component distortion, and no consideration of human hearing system, etc., to reduce fatigue, improve SNR, and signal of interest The effect of strength and comfort

Inactive Publication Date: 2005-01-19
SEMICON COMPONENTS IND LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Filtering distorts the frequency content of the signal
The AGC system does not take into account the human hearing system and produces suboptimal results
At the same time, even if these solutions can be applied, there are occasions where the energy consumption of these solutions is too large and limited, so miniaturization and low-energy technologies are required

Method used

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  • Sound intelligibilty enhancement using a psychoacoustic model and an oversampled filterbank
  • Sound intelligibilty enhancement using a psychoacoustic model and an oversampled filterbank
  • Sound intelligibilty enhancement using a psychoacoustic model and an oversampled filterbank

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Embodiment Construction

[0033] The preferred embodiment will now be described with specific reference to headphones for use by a listener, the invention being primarily, but not exclusively, applicable to headphones.

[0034] Signal processing algorithms applied to audio listening are often referred to as "receiving algorithms" (Rx), because the listener wants to hear the received audio signal. A typical application of the signal intelligibility enhancement (SIE) processing of the present invention is headphones for noisy environments. Figure 1 schematically shows this element and the signal of interest. The listener 101 listens to a combination of the desired sound, typically from the electrical signal 107, and ambient (surrounding) noise 110, which is an undesirable signal that degrades the intelligibility of the signal of interest. The passive attenuation provided by earphone 115 reduces the audible level of ambient noise.

[0035]If the strength of the signal of interest in the ear canal is muc...

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Abstract

A system and method of improving signal intelligibility over an interference signal is provided. The system includes a psychoacoustic professor having a psychoacoustic model wherein the level of a signal-of-interest is improved so as to be audible above noise and so as not to exceed a predetermined maximum output level. The system can be combined with active noise cancellation.

Description

field of invention [0001] The invention relates to audio reproduction applications, where the desired audio signal is obtained in uncontaminated form and disturbances, such as ambient noise, appear as sound signals. Background of the invention [0002] In a noisy environment, it is difficult for the listener to hear the desired sound signal or "signal of interest". For example, a cell phone user in a car may have difficulty hearing a received speech signal through their headphones because the noise of the car blocks out the signal of interest (ie, the speech signal received by the cell phone). To solve this problem, many attempts have been made in the past. Some of them are briefly described as follows: [0003] (a) Passive noise-attenuating earphones: Specific applications for earphone applications where passive noise attenuation is provided by large, bulky ear cups that physically isolate ambient acoustic noise from the listener's ears. [0004] (b) Amplification: Ampli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/04G10L21/0364H04S1/00H04S7/00
CPCG10L2021/02168G10L21/0208H04R2499/13G10L19/0204G10L19/0212G10L21/0264G10L21/0205H04R25/356G10L21/0364
Inventor T·施奈德D·库德R·L·布伦南P·欧利杰尼克
Owner SEMICON COMPONENTS IND LLC