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A Discontinuous Transmission Method for LPC Speech Codec

机译：LPC语音编解码器的不连续传输方法

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摘要

In order to improve the utilization of transmission bandwidth in voice communication, this paper proposes a discontinuous transmission method for LPC speech codec. Firstly, by using the algorithm of voice activity detection (VAD), the received signal is divided into voice frame and mute frame. Transitional frame is introduced when the voice frame is converted to mute frame. Then voice frames and transitional frames are encoded at a normal rate, but mute frames are encoded into silence description (SID) frame at a lower rate, which is sent by a method of discontinuous transmission mode. The transmission frequency of SID frame is adjusted automatically according to the fluctuation of characteristic parameters of background noise in mute frames. Finally, the method is applied to the simulation in the MELP vocoder, and the results show that this method has better adaptability in the transmission of mute signal and the synthesized background noise presents good comfort and continuity in the auditory perception.
机译：为了提高传输带宽的语音通信的利用率，本文提出了一种用于LPC语音编解码器的非连续传输方法。首先，通过使用语音活动检测（VAD）的算法，所接收的信号被划分成语音帧和静音帧。当语音帧转换到静音帧被引入过渡帧。然后语音帧和过渡帧被以正常速度进行编码，但静音帧被以较低的速率，它是由不连续的传输模式的方法发送的编码为静音描述（SID）帧。 SID帧的发送频率根据在静音帧背景噪声的特性参数的变动自动调节。最后，该方法被应用到在声码器MELP模拟，结果表明，该方法具有在静音信号的发射和在听觉感知的合成背景噪声呈现良好的舒适性和连续性更好的适应性。

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