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Method for identifying and eliminating echo generated by speech at remote end in SCDMA handset

A voice and echo technology, applied in voice analysis, two-way sound reinforcement telephone system, instrument, etc., can solve the problem that the echo channel does not meet the Geigel algorithm, etc.

Inactive Publication Date: 2007-02-21
BEIJING XINWEI TELECOM TECH
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Problems solved by technology

However, in many practical applications, such as SCDMA mobile phones, the echo channel does not satisfy the Geigel algorithm, and the Geigel algorithm cannot be simply applied for double-talk detection

Method used

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  • Method for identifying and eliminating echo generated by speech at remote end in SCDMA handset
  • Method for identifying and eliminating echo generated by speech at remote end in SCDMA handset
  • Method for identifying and eliminating echo generated by speech at remote end in SCDMA handset

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Embodiment Construction

[0016] figure 1 It shows the basic processing flow of the method for identifying and eliminating the echo generated by the far-end voice in the SCDMA mobile phone according to the present invention.

[0017] Such as Figure 2a ~ Figure 2f shows that the frequency characteristics of the far-end voice source signal, the near-end echo signal, and the near-end effective voice signal collected on the SCDMA mobile phone are analyzed. Figure 2a , Figure 2c , Figure 2e is the 4096-point signal waveform curve, and Figure 2b , Figure 2d Figure 2f is the 4096-point amplitude-frequency characteristic curve. It can be seen that the energy of the effective speech signal is mainly concentrated in the low frequency, while the energy of the echo generated through the echo channel is mainly concentrated in the high frequency. The full frequency band energy of the echo may not meet the Geigle algorithm. , But the size of low-frequency energy can be used to distinguish between echo and effectiv...

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Abstract

A method for identifying and eliminating echo generated from far end voice in CDMA mobile phone includes obtaining a frame sampling signal at near end to judge whether there is voice at far end or not according last 5-15 frames at far end, detecting voice echo of said frame if it is and calculating low frequency energy of said frame signal to judge out whether only echo is existed or not then carrying out smooth on echo or replace echo by comfort noise signal if echo is existed and not varying current signal if echo is not existed, or otherwise not requiring to carry out detection on voice of said frame at near end and directly coding and transmitting voice.

Description

Technical field [0001] The invention relates to a method for recognizing and eliminating the echo generated at the near end of the far-end voice of a mobile phone by using the spectral characteristics in a wireless communication application system. Background technique [0002] In a mobile phone, the sound waves originating from the receiver (earphone) are reflected by solid objects on the sound path into the microphone (microphone) of the mobile phone or into the speaker phone, thereby forming an acoustic echo, causing a reduction in call quality. [0003] At present, the method of eliminating acoustic echo is mainly based on double talk (Double Talk) detection. Double talk detection is to detect the current call status of the mobile phone. There is only the far-end voice (only the earpiece sound) and only the near-end voice (only Microphone voice), or the far-end near-end voice at the same time (double-ended conversation). The main method for double-talk detection is based on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02H04M9/08
Inventor 梁敏王晓宇
Owner BEIJING XINWEI TELECOM TECH
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