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    • 4. 发明公开
    • AMR-WB DTX 동기화를 제공하는 시스템 및 방법
    • 用于提供AMR-WB DTX同步的系统和方法
    • KR1020100063097A
    • 2010-06-10
    • KR1020107006843
    • 2008-08-28
    • 노키아 코포레이션
    • 오얄라파시라카니에미아리
    • H04N21/439H04N21/8547G10L19/00
    • G10L19/012G10L19/005
    • A system and method for providing improved adaptive multi-rate wideband (AMR-WB) discontinuous transmission (DTX) synchronization. According to various embodiments, an indication on the start of the inactive speech period is signalled to the decoder via a voice activity detection (VAD) flag a predetermined number of frames before the DTX period will start, i.e., before the SID_FIRST frame is received. When the VAD flag indicates active speech, or when the VAD flag has been set to zero less than the predetermined number of frames ago, the received NO DATA frame can be classified with a high degree of reliability as active speech, i.e., considered as transmitter, network or terminal-initiated signalling, and can be substituted by a SPEECH_LOST frame. When the VAD flag was set to zero eight frames ago or earlier, the NO_DATA frame is classified as DTX.
    • 一种用于提供改进的自适应多速率宽带(AMR-WB)不连续传输(DTX)同步的系统和方法。 根据各种实施例,在DTX周期开始之前,即在接收到SID_FIRST帧之前,通过语音活动检测(VAD)标志将预定数量的帧在无效语音周期开始时的指示信号通知解码器。 当VAD标志指示有效语音时,或者当VAD标志已被设置为小于预定数目的帧以前的零时,所接收的NO DATA帧可以以高可靠性分类为活动语音,即被认为是发射机 ,网络或终端发起的信令,并且可以被SPEECH_LOST帧替代。 当VAD标志在八帧前或更早版本设置为零时,NO_DATA帧被分类为DTX。