Method and apparatus for reducing false ringback detection
    12.
    发明授权
    Method and apparatus for reducing false ringback detection 失效
    用于减少假回环检测的方法和装置

    公开(公告)号:US6154537A

    公开(公告)日:2000-11-28

    申请号:US72165

    申请日:1998-05-04

    IPC分类号: H04M1/725 H04M1/82 H04M11/00

    CPC分类号: H04M3/02 H04M1/82 H04M1/72519

    摘要: In a communication device, a decoded audio signal is evaluated by a detection function (112). Two portions of the decoded audio signal spectrum are evaluated, a ringback band (206), and the remaining band(s). The signal strength in the ringback band is measured against a preselected ringback energy threshold level and the non-ringback signal strength is measured against a voice energy threshold level. Only if the ringback energy is above the ringback energy threshold level and the non-ringback band energy is below the voice energy threshold level will a ringback filter be applied to the audio signal.

    摘要翻译: 在通信装置中,解码音频信号由检测功能(112)进行评估。 评估解码的音频信号频谱的两部分,回铃带(206)和剩余的频带。 根据预选的回铃能量阈值电平测量回铃带中的信号强度,并根据语音能量阈值水平测量非回铃信号强度。 只有当回铃能量高于回环能量阈值水平并且非回波频带能量低于语音能量阈值水平时,回波滤波器才能应用于音频信号。