Audio Video Coding Standard (AVS) is a second-generation source coding standard and the first standard for audio and video coding in China with independent intellectual property rights. Its performance has reached t...Audio Video Coding Standard (AVS) is a second-generation source coding standard and the first standard for audio and video coding in China with independent intellectual property rights. Its performance has reached the international standard. Its coding efficiency is 2 to 3 times greater than that of MPEG -2. This technical solution is more simple, and it can greatly save channel resource. After more than ten years' development, AVS has achieved great success. The latest version of the AVS audio coding standard is ongoing and mainly aims at the increasing demand for low bitrate and high quality audio services. The paper reviews the history and recent development of AVS audio coding standard in terms of basic features, key techniques and performance. Finally, the future development of AVS audio coding standard is discussed.展开更多
Composite oxide catalysts Eu/TiO 2, Ce/TiO 2, Y/TiO 2 (RE/TiO 2) were prep ared by impregnation method and characterized by means of UV-Vis spectroscopy, TEM and BET. The results indicate that the size of TiO 2 has di...Composite oxide catalysts Eu/TiO 2, Ce/TiO 2, Y/TiO 2 (RE/TiO 2) were prep ared by impregnation method and characterized by means of UV-Vis spectroscopy, TEM and BET. The results indicate that the size of TiO 2 has different effect o n the modification effic iency. The catalytic activity of micron scale TiO 2 increases by 136% and 59% o w ing to the addition of Y and Ce, respectively, while the catalytic activity of n anoscale TiO 2 decreases due to the doping of Y and Ce.展开更多
摘要Audio Video Coding Standard (AVS) is a second-generation source coding standard and the first standard for audio and video coding in China with independent intellectual property rights. Its performance has reached the international standard. Its coding efficiency is 2 to 3 times greater than that of MPEG -2. This technical solution is more simple, and it can greatly save channel resource. After more than ten years' development, AVS has achieved great success. The latest version of the AVS audio coding standard is ongoing and mainly aims at the increasing demand for low bitrate and high quality audio services. The paper reviews the history and recent development of AVS audio coding standard in terms of basic features, key techniques and performance. Finally, the future development of AVS audio coding standard is discussed.
摘要Composite oxide catalysts Eu/TiO 2, Ce/TiO 2, Y/TiO 2 (RE/TiO 2) were prep ared by impregnation method and characterized by means of UV-Vis spectroscopy, TEM and BET. The results indicate that the size of TiO 2 has different effect o n the modification effic iency. The catalytic activity of micron scale TiO 2 increases by 136% and 59% o w ing to the addition of Y and Ce, respectively, while the catalytic activity of n anoscale TiO 2 decreases due to the doping of Y and Ce.