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Device and method for audio signal gain control

An audio signal and signal technology, applied in gain control, compression/expansion of digital/encoded signal volume, amplification control, etc., can solve the problems of high idle noise level, unpleasant sound quality, and unnecessary clearer sound data, etc.

Inactive Publication Date: 2008-05-21
SONY ERICSSON MOBILE COMM AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you increase the amplification, you also increase the noise, resulting in unpleasant sound quality and unnecessarily clearer sound data
Also, if the level of the audio data, i.e. usually speech, is very low, it may sometimes drop below the noise gate level and thus be cut off, leaving only an annoying and incomprehensible clutter
For this reason, the noise gate function must be turned off in many cases, which results in a higher idle noise level in the output signal

Method used

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  • Device and method for audio signal gain control

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Embodiment Construction

[0043] The present invention relates to gain control for audio signals in the field of audio compression. The present invention is generally applicable to portable radio communication devices such as mobile phones, but is not limited to this. In fact, the present invention can be used in an audio signal processing device that has an input terminal for an audio signal, an audio signal amplifier, and an audio signal output terminal. Therefore, it should be understood that the present invention can also be applied to, for example, fixed telephones. In addition, it should be emphasized that the term "comprising" used in the specification and appended claims to indicate the included features, elements, or steps cannot be construed as excluding those expressed or described in any way. Other features, elements or steps.

[0044] One embodiment mentioned below relates to an application in a mobile phone that processes an input audio signal received in a downlink from a remote party before...

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Abstract

Audio compressor device (20) for processing an audio signal and controlling a signal amplifier (24), comprising a signal analyser function (27,29) devised to analyse an input signal during a time frame (28) to determine if the signal represents noise or audio data, wherein the audio compressor device is adapted to set a gain for the signal amplifier dependent on the analysis. The analyser function may comprise an auto-correlation function (27), operative to perform auto-correlation of the input signal in a process for determining if the signal represents noise or audio data.

Description

Technical field [0001] The present invention generally relates to a method of controlling the gain of an audio signal and an audio compressor device suitable for controlling the gain of an audio signal. More specifically, the present invention relates to an apparatus for analyzing the content of an audio signal to estimate the presence of noise in the audio signal and controlling the gain based on the analysis. Background technique [0002] The mobile phone industry has made considerable progress in terms of service quality, transmission capabilities, and technology for manufacturing advanced communication terminals. In just a few decades, the communication system has moved from analog to digital. At the same time, the size of the communication terminal has transitioned from the size of a briefcase to a phone that can be placed in a pocket today. Currently, mobile phones are becoming smaller and smaller, and their size is generally considered to be an important factor for end use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G7/00H03G3/32G10L21/034G10L25/06G10L25/78G10L25/84
CPCH03G3/32H03G7/00H03G7/007A61B17/62A61B17/66
Inventor S·古斯塔夫森
Owner SONY ERICSSON MOBILE COMM AB