Even 1999/3/9 DTS company officially launched the latest dts-es extended surround, and finally in June 2000 +05 DTS company released the news again, and they will soon launch the dts-es discrete 6. 1 format specifically for home theaters. Since then, the multi-channel digital audio compression format in dvd video has officially entered the real 6. 1 channel audio. Since the appearance of dvd video in the above format, questions about dd5. 1-ex or dts-es have been frequently asked in audio-visual related forums, and there is an increasing trend to release movies in the above two audio formats. Therefore, at the invitation of friends, the author once again provides some personal research to netizens who are interested in understanding their basic structures and even discussing related issues, and also hopes to clarify some sometimes vague concepts.