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本文用双片TMS320C25实现了一个码率约为7kbps的实时CELP编码器(如附图)。该编码器构造了一个结构化的高斯噪声码本,并推导出适合双片处理器工作的双向递推求加权滤波器响应的公式,用以完成码本的快速搜索。该编码器还包含有一个话音检测器(VAD),用以实现有/无话检测。
In this paper, a two-chip TMS320C25 achieved a code rate of about 7kbps real-time CELP encoder (as the figure). The encoder constructs a structured Gaussian noise codebook and deduces the formula of two-way recursive weighted filter response which is suitable for the operation of two-chip processor to complete the fast search of the codebook. The encoder also includes a voice detector (VAD) for presence / absence detection.