500results about How to "Reduce bit rate" patented technology

The invention discloses a method and system for intelligently playing online videos, a player and a mobile terminal. The method includes the steps that a video is sliced into sliced videos of multiple visions according to code rates at different levels from low to high, wherein the sliced videos of all the versions correspond to the code rates at different levels; in the initial playing period, the player loads the first sliced video corresponding to the code rate at the lowest level from the vision with the code rate at the lowest level to play the video; when video playing is stable, the player automatically detects the network condition, and selects the video slice with the code rate at the proper level to be uploaded and played according to the code rate corresponding to the current network condition and the resolution ratio supported by a playing terminal. By means of the method and the system, new functions are added to the mobile terminal, the player and the like; when the online videos are played, the video with the proper code rate can be automatically selected and played according to the current network speed condition, the smooth playing effect is achieved, and convenience is provided for users.

A bandwidth-efficient concatenated trellis-coded modulation (TCM) decoder which is realized by combining turbo codes having an advantage of coping effectively with a fading channel with TCM having an advantage of bandwidth efficiency, and a decoding method thereof are provided. A conventional TCM method has high bandwidth efficiency suitable for transmitting information at high speed. However, it is very sensitive to InterSymbol interference (ISI) so it is usually applied to a wire communication system rather than to a wireless communication system. A turbo code method is an error correction encoding method showing steadiness in a channel having severe ISI and having an excellent error correction ability, but has drawbacks of low data transmission rate and low bandwidth efficiency due to a low code rate. Bandwidth-efficient concatenated TCM is provided for enhancing the steadiness against ISI and-improving power and bandwidth efficiency by applying the turbo code method to a TCM having a code rate of m / (m+1) to compensate for the drawbacks of the conventional TCM and turbo codes. A newly provided decoding method in bandwidth-efficient concatenated TCM uses a SOVA algorithm, thereby reducing decoder complexity and path memory. In addition, bandwidth-efficient concatenated TCM encoder and decoder are provided such to have parallel transition, thereby reducing the complexity of the bandwidth-efficient concatenated TCM decoder. Therefore, the Bandwidth-efficient concatenated TCM is applied to a high speed wireless communication system and can increase bandwidth efficiency and coding gain.