Designs and develops stand - alone video data ' s compress code and decompress decode system . realizes motion picture ' s compress code and decompress decode in real time , and self - adaptation control of data flow 開(kāi)發(fā)了實(shí)時(shí)運(yùn)動(dòng)圖像視頻壓縮編碼和解壓縮解碼系統(tǒng),實(shí)現(xiàn)了脫機(jī)視頻壓縮編碼和解壓縮解碼系統(tǒng)的實(shí)時(shí)圖像處理和數(shù)據(jù)流量的自適應(yīng)控制。
Secondly , after introducing the subjective / objective assessments of the video coding / decoding system , the thesis compares the performance of h . 264 to the other standards ’ performance , opens out the special predominance of h . 264 in detail 其次,在介紹了視頻編解碼系統(tǒng)性能的主客觀衡量標(biāo)準(zhǔn)后,將h . 264與其它視頻編解碼標(biāo)準(zhǔn)進(jìn)行了性能上的比較,詳盡地論證了h . 264所具有的技術(shù)優(yōu)勢(shì)。
The principle and structure of the decoding system are described and analyzed , the system uses a digital signal processor tms320vc5409 as a key device with a complex programmable logic device epm7128 , and use a usb chip according with usb1 . 1 protocol to communicate with the pc , it can decode the mp3 bitstreams realtime and output the digital audio by a speaker 重點(diǎn)介紹了mp3播放系統(tǒng)的原理與結(jié)構(gòu),該系統(tǒng)以一片通用定點(diǎn)數(shù)字信號(hào)處理器tms320vc5409為核心完成數(shù)據(jù)解碼和控制功能,結(jié)合一片復(fù)雜可編程邏輯器件epm7128進(jìn)行外圍控制,并通過(guò)符合usb1 . 1標(biāo)準(zhǔn)的usb連接芯片與主機(jī)進(jìn)行通訊,使其能夠滿足實(shí)時(shí)的mp3數(shù)據(jù)流存儲(chǔ),解碼及數(shù)字音頻的輸出。
But now , mpeg2 ' s compressing and decompressing algorithms and mechanism is inviable to mapc - ca ' s architecture , the hardware can not efficiently work . aim at these mostly questions of mpeg2 ' s real - time handling , mpeg2 ' s video coding and decoding system based on map - ca have been implemented . mpeg2 ' s key algorithms have been improved 針對(duì)mpeg2實(shí)時(shí)處理中面臨的主要問(wèn)題,課題基于mapca實(shí)現(xiàn)了mpeg2實(shí)時(shí)編碼解碼系統(tǒng);改進(jìn)了mpeg2關(guān)鍵算法,提出了新的實(shí)現(xiàn)方法,如量化反量化算法, dct變換idct變換算法,運(yùn)動(dòng)估計(jì)算法等;利用datastreamerdma控制器進(jìn)行數(shù)據(jù)傳輸,最大限度地減少數(shù)據(jù)等待時(shí)間。
This product usesthe fm radio set code decoding system , has the ultra strongantijamming ability and the extremely low power loss , the reactionrate is keen , the highest synchronous speed amounts to for 1 1 , 000second , can satisfy photographic camera of each kind of type shuttersynchronized flash photography request 該產(chǎn)品采用調(diào)頻無(wú)線電編碼解碼系統(tǒng),有超強(qiáng)的抗干擾能力和極低的功耗,反應(yīng)速度靈敏,最高同步速度達(dá)1 1000秒,能滿足各種類型快門之照相機(jī)的同步閃光拍攝要求。