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本文介绍在综合端不需要有/无声开关的一种改进的LPC系统(LPC+)。综合滤波器的激励函数的模型是传统脉冲源和噪声源的组合,其混合比用LPC误差信号估算这个参数控制脉冲和噪声的幅度。由于去掉了有/无声开关,本系统在高噪声环境下产生健全的话音,而传统的LPC系统由于有无声的错判而使话音质量降低。另外,本技术已用于两个人同时讲话的情况,其话音的可懂度和自然度比用常规LPC声码器产生的话音要好。
This article describes an improved LPC system (LPC +) that does not require the presence / absence of the switch at the aggregate side. The model of the integrated filter’s excitation function is a combination of a traditional pulse source and a noise source whose mixing ratio estimates the amplitude of this control pulse and noise using an LPC error signal. Due to the elimination of the presence / absence of the switch, the system produces a perfect voice in noisy environments, whereas the conventional LPC system degrades the voice quality due to the silent misjudgment. In addition, the present technology has been used in a situation where two people speak at the same time, whose speech intelligibility and naturalness are better than those generated by the conventional LPC vocoder.