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④视频基本码流的层次结构如图9所示。MPEG-4为1998年制定的标准,用于表述、集成和变换音/视频信息的压缩编码标准。MPEG-7为2000年制定的国际标准,为应用于音/视频信息检索的压缩编码标准。3.数字音频压缩编码原理音频信号的压缩编码主要是根据入耳的听觉特性进行的。它采用数字压缩方法,减少音频信号中的冗余和去掉音频信号中不相关的部分,如入耳几乎听不到的频率很低和很高的音频信号。
④ video elementary stream hierarchy as shown in Figure 9. MPEG-4 is a standard developed in 1998 for compression coding standards that express, integrate and transform audio / video information. MPEG-7 is an international standard established in 2000, and is a compression coding standard applied to audio / video information retrieval. 3. Principles of Digital Audio Compression Coding Compression coding of audio signals is mainly based on the auditory characteristics of the ear. It uses digital compression to reduce redundancy in audio signals and to remove uncorrelated portions of the audio signal, such as very low frequency and high audio signals that are barely audible to the ears.