digital codec 中文意思是什麼
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The hardware of the ip phone codec to be designed is based on the fixed point digital signal processor ( ti ' s tms320vc5410 ) while the compression and decompression core in the software of dsp is based on the itu - t vg. 729a. ip phone codec carryout the task of collecting / playing - back. coding / decoding of speech signal and communication with embedded cpu. etc
該語音編解碼器的硬體基於tms320vc5410 ，編解碼演算法遵循itu - tg . 729a協議，能夠實現語音信號的採集/回放、編碼/解碼以及同嵌入式cpu通信等功能，在8kbit / s的碼率下能夠提供獲得良好的語音質量。 -
Section ii describes the design approach and implementation of speech module on mcf5249 coldfire core. the speech codec optimizes g. 729a codes and added voice activity detection of g. 729b to save bandwidth ; the implementation of acoustic echo cancellation uses nlms algorithm and it can reduce echo though designing adaptive fir filter and speech detector ; the dtmf and cpt generate signal using two second order digital sinusoidal oscillators and detect signal by picking up the frequency information. but only get the frequency information is not enough in cpt detector, this thesis introduces a method
其中對語音編解碼器的設計採用優化g . 729a代碼達到設計要求，並在此基礎上加入g . 729b的靜音檢測模塊，以進一步降低網路傳輸帶寬;對回聲消除器的設計採用nlms演算法，通過設計自適應fir濾波器和語音檢測器達到回聲消除目的;對雙音多頻設計，信號發生端採用構造靜態參數表並通過二階正弦振蕩器產生信號，信號檢測端提取頻率信息以檢測信號;對呼叫進程音設計，除了類似雙音多頻的信號發生及頻率檢測設計外，還需要檢測信號持續時間，作者設計了一種基於匹配狀態表的方法以檢測信號持續時間。 -
Standards of digital tv broadcast has specified transmitting systems which are based on various medium such as satellite - oriented transmitting system ( dvb - s ), cable - oriented transmitting system ( dvb - c ), terrestrial - oriented transmitting system ( dvb - t ). different system adopts different methods of channel codec, modulation and demodulation, but for signal source block codec, only mpeg - 2 standard has been applied for all the systems. as a compression standard being specified in digital tv broadcast transmission, mpeg - 2 has been widely involved on compression occasion
對于數字電視信號的傳輸，數字電視廣播標準制定出基於多種媒質傳輸的傳輸系統，如衛星傳輸系統（ dvb - s ） ，電纜電視傳輸系統（ dvb - c ） ，地面廣播（ dvb - t ） ，不同的傳輸系統制定不同的通道編碼和調制解調的方法，但是對于所有傳輸系統的信源編碼則一律採用mpeg - 2這一標準。 -
Since then, jeilin has developed many important core technologies such as jpeg codec, usb device controller, high - performance image processor, dsc controller, memory card interface controller, ide interface controller, tv encoder, and mpeg - 4 codec, etc. with these core technologies, jeilin has successfully promoted cost - effective solutions for customer s products such as pc camera, web camera, dsc, photo card reader and digital picture frame
傑霖科技致力於影像與多媒體ic的設計與研發，已成功開發多種pc周邊控制晶片多媒體影音控制晶片及客戶委託之應用ic如通訊產品asic等研發。針對影像處理技術， jpeg codec壓縮及解壓縮技術mpeg 4 codec系統整合tv encoder介面技術usb 2 . 0介面技術及ide介面技術，皆有豐富的開發與整合的成功經驗，並極力推陳出新。 -
Enhanced variable rate codec speech service option 3 for wideband spread spectrum digital systems
寬帶頻譜擴展數字系統用增強的可變率編譯碼器語音服務選擇3 -
Evrc 3 software distribution for tia - 127 - a - enhanced variable rate codec speech service option 3 for wideband spread spectrum digital systems
Tia - 127 - a的軟體配置.寬帶頻譜擴展數字系統用增強的可變率編譯碼器 -
We are developing advanced ip core of system lsi for digital av application, such as a video codec and an audio codec, with high performance, high quality, small size and low power consumption
我們正從事數字影音產品先進ip核的開發，例如高性能、高質量、小尺寸和低功耗的視頻編解碼器和音頻編解碼器。 -
Tetra - the new digital trunked communication system, specifies algebraic codebook excited linear prediction ( acelp ), which is improved codebook excited linear prediction ( celp ), as its speech codec. the bit rate of it is 4. 567kbit / s
本文首先詳細介紹了新一代數字集群通信系統tetra的語音編解碼採用的編碼速率4 . 567kbit s的代數碼本激勵線性預測（ acelp ）演算法。 -
Second, some techniques in the digital surveillance system, including audio and video codec. tcp / ip protocol and ip multicasting, are introduced in the paper. at the same time, the trimedia are referred to, which is a powerful media signal processor and used in the system largely, and the programming api is specified, too
其次，論文介紹了數字監控系統中所涉及的部分技術，包括音視頻編解碼、 tcp ip協議和ip多播，並簡要概述了用於數字監控系統中的多媒體處理晶元trimedia的特點和編程api 。 -
This multifunctional product enables video music file editing, photo data readings edit, and more. furthermore, with the " nero digital codec, " hd resolution contents may also be stored on currently recordable dvd discs, where over 5 million approved devices using this format in europe are expected for shipment. likewise, compatible devices for shipment to the u. s. and japan in the 1st half of this year are expected
這款新產品為多功能產品，可進行視頻音樂文件的編輯以及照片數據的瀏覽編輯等，另外，該公司開發的「 nero digital codec 」可將hd解析度的內容保存到當前的記錄型dvd上，在歐洲已有500萬臺可接受本格式認證的設備預定出廠，預計日本和美國也會在今年上半年推出對應產品。 -
This dissertation has studied some key technologies in the field of dpcs on av. first, this dissertation gives a summarize about the development status of the alteration and upgrade in the tv broadcasting system, in which a serious of key technologies of dpcs, including digital compression codec technology, large capacity storage and fault - tolerance technology, network connection technology, and systems security mode, are stressed
論文首先對視頻廣播行業數字化改造的現狀與趨勢進行綜述，重點討論了數字播控所涉及的若干關鍵技術的概況，包括數字壓縮編解碼技術、海量存儲與容錯技術、網路互連技術和系統安全備份播出技術等，並對電視節目的制、編、播一體化網路進行展望。 -
As the information era proceeds, highly developed digital image processing technique and communication technique make multimedia communication possible, and it is now on the way of progress. video conference have received more attention as an example of multimedia. in this paper we first describe the construction and characteristic of the video conference system and analyze the theory of protocol with itu - t h. 323 recommendation which inculde video and audio codec standard, communication control protocol h. 245. call signalling protocol h. 225, as well as procedures within these protocols define how these components communicate. also an experimental video conferencing system is designed and some relating key technologies are studied, which include multithread programming, transmission technology, mcu technology, qos mechanism and so on. especially, a video codec based on h. 263 recommendation with high fram rate as well as high compression ratio is researched and implemented because of importance of video application, which solves the bad image reconstrction quality problem existed in the most present video systems that adopt h. 261 video compression algorithm. by using these technologies. a video conferencing system is implemented based on lan. the system that the paper provides is easy to implement and the results of exmperiment is good. such system can be widely used in the fields such as business conference, distance education etc. and it is of good practical value
隨著信息時代的前進，數字圖像處理技術和通信技術的高度發展，多媒體通信已成為可能並已初具規模，視頻會議作為它的一個具體應用實例受到普遍關注。本文首先對國際電信聯盟itu - t制定的基於分組交換的多媒體通信h . 323系列建議進行了闡述，其中包括ip網路視頻會議系統的結構組成、視頻傳輸標準、音頻傳輸標準、系統的信息碼流、通信控制協議h . 245和呼叫信令協議h . 225以及會議系統的進行過程。在此基礎上給出了ip視頻會議的實現的整體框架，為系統的軟體實現進行了模塊的劃分和整體設計，分析了各個模塊的功能、作用。 -
The system includes a digital video codec / decodec chip adv611 based on wavelet - transform, a saa7111 chip and a dsp chip tms320vc5402 controlling the systems
該系統以tms320vc5402為主控晶元，選用小波壓縮晶元adv611和圖像處理晶元saa7111設計了硬體電路，較好地實現了視頻信號低速率傳輸的問題。
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