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Audio system with feedback detection means

An audio system and detector technology, applied in interconnection devices, transducer acoustic response prevention, telephone structure, etc., can solve problems such as output transducer howling sound

Active Publication Date: 2012-02-29
OTICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Feedback often produces loud howling in the output transducer

Method used

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  • Audio system with feedback detection means
  • Audio system with feedback detection means
  • Audio system with feedback detection means

Examples

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Embodiment Construction

[0014] figure 1 An example of a system according to the invention is represented. Although a hearing aid is shown in the example, any audio device having a microphone 1, signal processing means and output transducer or speaker 2, in which an acoustic feedback path 3 is provided, can benefit from the invention. figure 1 The hearing aid 4 further includes an AD converter 5 , a signal shaping module 6 , an all-pass filter module 7 and a DA converter 8 . The delay and thus the phase in the loop containing the elements 1 , 5 , 6 , 7 , 8 , 2 in the hearing aid and the acoustic feedback path 3 depends largely on the signal processing in the hearing aid 4 . In-loop sample delays of 100 sample steps (about 6 milliseconds) are not uncommon in hearing aids. The frequencies with potential howling are therefore divided by about 170 Hz. Changing the phase by 180 degrees at the howling frequency will cause the frequency at which howling is likely to occur to shift by approximately 85 Hz. ...

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Abstract

The invention concerns an audio system comprising a microphone, audio signal processing means, an output transducer and mans for detecting a possible feedback tone and the corresponding frequency of the feedback tone in the audio system between the output transducer and the microphone. According to the invention means for counteracting feedback are provided. Further, mans are provided for changing the phase of the audio signal at a given frequency.

Description

technical field [0001] The invention relates to an audio system comprising a microphone, an audio signal processing device and an output transducer, wherein the signal processing device comprises a detector for detecting the state of feedback between the output transducer and the microphone in the audio system. Background technique [0002] Feedback often produces loud howling in the output transducer. The development of feedback in feedback cancellation systems is controlled using a detector that can detect the presence of feedback, which detection can be used to control adaptation, for example to speed up adaptation in the presence of howling. It can also be used as an "online feedback manager" for hearing aids without a feedback cancellation system. Reduce the gain at the frequency where howling is detected. Feedback is usually a fairly narrow and loud signal, and it is not difficult to set up a detector for this type of signal in the signal path, but if a similar signa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/02
CPCH04R25/453H04M9/082H04M1/20H04R3/02
Inventor 托马斯·伯·埃尔梅迪布约翰·赫尔格伦
Owner OTICON