会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 52. 发明授权
    • Method of detecting narrow-band signals in an echo canceller
    • 检测回波消除器中窄带信号的方法
    • US5689556A
    • 1997-11-18
    • US528762
    • 1995-09-15
    • Prabhat K. GuptaSanjay Gupta
    • Prabhat K. GuptaSanjay Gupta
    • H04B3/23
    • H04B3/23
    • A method of detecting narrow-band signals in an echo canceller to control the coefficient update process, echo suppression process, and the disablement of the echo canceller is provided. The method includes the steps of searching for the presence of a generic tone, searching for DTMF tones, searching for a 2100 Hz tone and, if a generic tone is found, searching for a dial tone. If a generic tone is detected on the far end signal, a tone flag is set which triggers the disablement of the echo canceller coefficient update process and the enablement of the echo suppressor process. If a 2100 Hz tone is detected, the echo canceller is disabled. If a DTMF signal is detected, DTMF flags are set which are used by the echo suppressor for suppressing the near end echo. Finally, if a dial tone is detected, dial tone flags are set which cause the disablement of the echo suppressor.
    • 提供了一种检测回波消除器中的窄带信号以控制系数更新过程,回波抑制处理和回波消除器的禁用的方法。 该方法包括以下步骤:搜索通用音调的存在,搜索DTMF音调,搜索2100Hz音调,并且如果发现通用音调,则搜索拨号音。 如果在远端信号上检测到通用音调,则设置音调标志,其触发禁用回声消除器系数更新处理和启用回声抑制器处理。 如果检测到2100 Hz音,则禁用回声消除器。 如果检测到DTMF信号,则设置DTMF标志,由回波抑制器用于抑制近端回波。 最后,如果检测到拨号音,则设置拨号音标志,导致禁用回声抑制器。