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: 2009-07-01
BEIJING XINWEI TELECOM TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

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

[0017] Such as Figure 2a As shown in Fig. 2f, for the far-end voice source signal collected on the SCDMA mobile phone, the near-end echo signal and the near-end effective voice signal are analyzed for frequency characteristics, among which Figure 2a , Figure 2c , Figure 2e is the signal waveform curve of 4096 points, and Figure 2b , Figure 2d , Figure 2f is the amplitude-frequency characteristic curve of 4096 points. It can be seen that the energy of the effective voice 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, and the full-band energy of the echo does not necessarily satisfy the Geigle algorithm. , but the magnitude of the low-frequency energy can be used to dis...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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 identifying and eliminating the near-end echo produced by the far-end voice of a mobile phone by using spectrum characteristics in a wireless communication application system. Background technique [0002] In a mobile phone, 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 speakerphone, thereby forming an acoustic echo and degrading the call quality. [0003] At present, the method of eliminating acoustic echo is mainly based on double talk (Double Talk) detection, which detects the current state of the mobile phone call, and there is only far-end voice (only earpiece sound), only near-end voice (only Microphone sound), or the far-end and near-end voices exist at the same time (double-ended conversation). The main method used for double-talk detection is designed and implemented based on the Geigel...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02H04M9/08
Inventor 梁敏王晓宇
Owner BEIJING XINWEI TELECOM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap