解析DVD、HDV、EVD、HVD的编码技术（国外英文资料）.docVIP

解析DVD、HDV、EVD、HVD的编码技术（国外英文资料） The present situation and development trend of international audio coding technology Currently, the international campaign image expert group (MPEG) has introduced several audio coding techniques. The mpeg-1 (ISO/IEC11172-3) codes for the coding complexity of three levels, supporting the sampling rate of 32, 44.1 and 48KHz mono and Dual mono (stereo or Dual mono) codes. Layer 3 (MP3) with dual channel stereo coding in 128 kbit/s for most music coding can achieve close to CD quality effect, become the first standard of network music and portable electronic devices. Mpeg-2 BC (ISO/IEC13818-3) is the backward compatibility of mpeg-1 multichannel expansion plan, and added a low frequency effect channel to increase to 5.1 channel coding, and supports 16, 22.5, and 24 KHZ sampling audio signal coding. The mpeg-2 Advanced Audio Coding (ISO/iec13818-7aac), which marks MPEGs highest level of technology, provides a high quality Audio encoding of 1 ~ 48 Audio channels with a sampling rate of 8 ~ 96KHz. It is suitable for high quality audio coding from the bitrate at 8kbit/s monophonic to 160kbit/s. Using AAC for single-channel audio coding, most music codes in 64Kbit/s will be able to reach the sound quality of the CD. As a result, the coding efficiency has improved considerably compared with the MP3s 96Kbit/s, which is considered the next generation of audio coding standards. In terms of multichannel surround sound encoding, American dolby laboratories AC - 3 to 32, 44.1, and 48 KHZ sampling, from mono to 5.1 surround sound audio signal encoding, and support rate range from 32 kbit/s (mono stream to 640 kbit/s multichannel high quality audio stream. DolbyAC - 3 is because of its good capability of sound field and acoustic image again, won the film, home theater, DVD, and widely used in the field of digital television sound, become the DE facto international standard. Other excellent audio coding techniques, such as SONYs ATARC, bell LABS PAC and