1. Viterbi algorithm is the most likelihood decode algorithm of convolution code. 维特比译码算法是卷积编码的最大似然译码算法。
2. Of course, security and encryption also come into play, since the proxy must be able to open the "package" to look at it or decode its contents. 当然，由于代理必须有能力打开“包”，看看其内部或者对其内容进行译码，所以安全和加密也随之而来。
3. In order to implement real-time correction of distortion, encoder must encode the digital signals synchronously when decoder begins to decode the analog signals. 为了实现畸变的实时校正，要求解码器对模拟信号解码与编码器对数字信号编码必须同步进行。
