idct 中文意思是什麼

Researching into tg - dt diagrams, we have concluded as follows : the initial decomposition temperature ( idct ) of polymer ( i ) is 220c and the first lost group ( flg ) ls carboxide ; the idct of polymer ( hi ) is 194cand the flg is - nh ; so the pyrolysis mechanisms of the two polymers are different

對聚合物（ d和聚合物（ l11 ）的tg一ot研究表明:聚合物（ d的開始分解溫度為220 ，失去的第一個基團為> c = 0 ;聚合物（ 11工）的開始分解溫度為! 94oc ，先失基團為一陽，兩者的熱解機理不盡相同。

In chapter two, using the instruction of simd and memory in pentium to optimize idct, motion compensation and recompose frame and improving executive speed of idct to utilize vlcd and iq

在第二章中，使用intel處理器中的simd指令和內存優化技術對idct （反離散餘弦變化） 、運動補償和圖像重組等解碼過程進行優化實現。

Combining the principles of pipelining and parallelism of dsp with idct theory, we concentrate on the use of multiply - accumulate unit of mcf5272 by merging the operations of addition and multiplication, and realize two dimension of idct with one dimension of idct efficiently. testing shows the software meets the requirement of real - time decoder

重點結合mcf5272的流水線操作和并行操作特徵和反離散餘弦變換演算法原理，將的二維反離散餘弦變換轉換成8點的一維反離散餘弦變換，利用乘法累加器合併加法運算和乘法運算高效快速地實現了反離散餘弦變換演算法。

Idct inverse discrete cosine transform

離散餘弦逆變換

The motion estimation and dct / idct arithmetic have fully exploited the parallel characteristic of fpga

提出的運動估值演算法和dct idct演算法充分利用fpga的并行性特點。

The dct / idct module and the motion estimation module which need more operation are found and optimized. and the dct / idct module is transformed to fix - point

本文對h . 263視頻編解碼的基本原理、系統結構和壓縮方法做了簡要的分析。

A hierarchical coding technique based on all phase idct interpolation

晶體相位補償網路及在線性相位濾波器中的應用

First the survey of video encoding development has been conducted, then the video compression technology has been introduced and the application of fpga and dsp processor in video compression field is appended, finally the hardware implementation of video compressor based on h. 263 standard is introduced. according to the characteristic of fpga, we bring forward the motion estimate and dct / idct arith metic which can be easily implemented in hardware

首先介紹了視頻壓縮編碼發展的概況；然後介紹基於變換編碼的視頻壓縮方法，並介紹fpga和dsp處理器在視頻壓縮編碼器中的應用；最後介紹了基於h . 263標準的視頻壓縮編碼器硬體實現，並根據fpga的特點，提出適合其實現的運動估值演算法和dct和idct演算法。

In the next, we discuss the system of the meg - 1 layer i. the paper centers on the two kernel sub - parts : filtering coding and psychoacoustic model, do some research work in sub - band coding ( cbc ) theory and the relate theory such as quadrature mirror filter ( qmf ) and analyse sub - band filter ; also do research work in psychoacoustic theory especially the part related to the mpeg - 1 layer i. in the third chapter, introduce the ti tms320c6000 series dsps and their characteristics, also about the software development flow and the ti dsp / bios operating system of it. the forth chapter is the most important, firstly, according the algorithm flow in protocol, using c language validate the algorithm ; then, transplant and optimize the coding in dsp. in the processing of optimize, acording the assembler program characteristic of ti dsp, the paper put forward the analyse sub - band filter dsp optimization algorithm base on the eight spot idct. the algorithm has been optimize have greatly improved the work efficiency. make use of the technology of the dsp / bios host channels, data io pipe, software interrupt, we implement the musicam algorithm base on dsp / bios

論文首先對當前語音編碼技術的發展、分類以及mpeg系列音頻標準作了介紹；接著在第二章，給出了layer的musicam （ masking - patternuniversalsubbandintegratedcodingandmultiplexing ）演算法的系統組成，圍繞分析子帶濾波器和心理聲學模型兩個核心模塊，深入研究了子帶編碼工作原理、比特分配及子帶編碼中用到的正交鏡像濾波器和分析子帶濾波器；探討了心理聲學基本原理和mpeg . 1layer所用到的心理聲學模型。第三章對titms320c6000系列dsp作了簡介，介紹了6000系列dsp結構特點、 c6000dsp軟體開發流程和tidsp / bios操作系統。第四章是本文的重點，首先根據協議給出的演算法用標準c語言編程實現並調試通過。

The system is composed with six sections which are entropy decoder, inverse z transform, inverse quantization, inverse discrete cosine transform ( idct ), up sampling and color space transform

Jpeg解碼演算法主要由熵解碼、逆z變換、反量化、反離散餘弦變換、內插和色度空間轉換六部分組成。

A fast idct algorithm is applied for the speed optimization of the idct module, and mmx technology is also adopted to obtain higher decoding speed of the basic decoder on pc platform

為了提高基本解碼器的解碼速度，本文對基本解碼器中idct模塊採用快速演算法進行速度上的優化，並採用mmx技術進一步提高基本解碼器在pc平臺上的解碼速度。

Depending on the constructure of tms320dm642 and unique characteristic of h. 264 application program, we optimized whole structure and dct / idct, quazitation and vlc which cost most of coding time

針對tms320dm642晶元的結構和h . 264應用程序自身的特點，對該協議的總體結構以及其中最耗時模塊中的dct / idct以及量化和vlc編碼部分進行軟體優化。