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Method for improving noise of idle audio channel and audio receiving system of mobile phone

An idle channel and audio signal technology, applied in wireless communication, telephone structure, advanced technology, etc., can solve problems such as difficult debugging, receiving loudness and receiving distortion, and achieve the effect of improving the noise of audio idle channels

Inactive Publication Date: 2010-02-03
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the noise problem, the traditional method is to connect a large resistor in series between the audio output terminal of the chip 11 and the speaker 12 to attenuate the noise power to meet the requirements. The process has a great impact on the receiving loudness and receiving distortion, and it is difficult to debug

Method used

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  • Method for improving noise of idle audio channel and audio receiving system of mobile phone
  • Method for improving noise of idle audio channel and audio receiving system of mobile phone
  • Method for improving noise of idle audio channel and audio receiving system of mobile phone

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Embodiment Construction

[0027] The invention is based on the analysis of the output noise distribution graph of the current audio output chip, and obtains a method for improving the noise influence of the audio idle channel.

[0028] figure 2 is the output noise distribution map of the current audio output chip. From figure 2 It can be seen from the chip output noise spectrum, first of all, the output noise at this time is -44.14dB Pa, which is 12.86dB larger than the -57dB Pa required by the 3GPP TS 26.131 protocol. Secondly, within the noise test frequency band 200Hz-4kHz, the noise power is basically evenly distributed.

[0029] Therefore, according to an embodiment of the present invention, a method for improving the noise impact of the audio idle channel is proposed, the method is to input the audio signal to the Σ-Δ modulator after the audio processing unit of the mobile phone generates an audio signal, thereby Noise shaping can be performed using sigma-delta modulation to move noise in th...

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Abstract

The invention provides a method for improving the noise of an idle audio channel, which is applied to an audio receiving system of a mobile phone. The method comprises the following steps: generatingan audio signal; and inputting the audio signal to a Sigma-Delta modulator for noise reshaping so as to remove the noise in the audio signal out of a preset tested frequency band. The method can reduce the noise power of the tested frequency band in the audio receiving system of the mobile phone, so the audio receiving system of the mobile phone is endowed with a signal to noise ratio meeting therequirement of a protocol 3GPP TS 26.131. The invention also provides the audio receiving system of the mobile phone.

Description

technical field [0001] The invention relates to the improvement of the audio quality of the third generation mobile communication system, in particular to a method for improving the noise of an audio idle channel, and a mobile phone audio receiving system using the method. Background technique [0002] The third generation (3G) mobile communication system is gradually replacing the traditional 2G mobile communication system worldwide. 3G mobile phones with richer functions such as video telephony and multimedia applications have gradually entered people's field of vision. Compared with previous 2G mobile phones, 3G mobile phones have higher requirements for various performances. Taking the audio test as an example, 3G mobile phones have added many test items compared with 2G mobile phones, among which receiving idle channel noise (Idle Channel Noise) is the most important one. [0003] Receive idle channel noise is to measure the output noise when the two parties are not t...

Claims

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Application Information

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IPC IPC(8): H04W88/02H04M1/19
CPCY02B60/50Y02D30/70
Inventor 郭为
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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