low rate code 中文意思是什麼
low rate code
解釋
低速率碼-
2, under equally see the quantity, compress the calculate way s exportation code plain deal connect the good and bad that decide its function of the good and bad, or say, output the code the term of same alike rate the bottom, and the portrait quantity reflected the function of the compression calculate way. adopt with dv all because of the m - jpeg an inside compress the way, efficiency of their compression certainly want lower than mpeg2. certainly, this is an average circumstance, at the time that low code rate, the mpeg2 can compare the m - jpeg compression the ratio high and a lot of but keep the good diagram to resemble the quantity ; but at request the diagram to resemble the quantity the good time for example the sow the room program edit with empress period creation, their difference to is not very big. too is to say, just at the compression efficiency that not emphasize the portrait quantity that the circumstance, mpeg2 is high
2在同樣的視頻質量下，壓縮演算法的輸出碼率直接決定其性能的優劣，或者說，輸出碼率相同的條件下，圖象質量的優劣反映了壓縮演算法的性能。由於m - jpeg和dv都是採用幀內壓縮方式，它們的壓縮效率當然要比mpeg2低。當然，這是一個平均情況，在低碼率的時候， mpeg2可以比m - jpeg的壓縮比高很多而保持較好的圖像質量而在要求圖像質量很好的時候比如演播室節目編輯和後期製作，它們的差別不是很大。 -
In the last half century, researchers have always been searching good code with rate closing to the shannon theory limitation, error ratio being low and it being to be decoded easily
半個世紀以來，人們一直在尋找碼率接近香農理論極限、誤差概率小和譯碼復雜性低的好碼（又稱漸近好碼或shannon碼） 。 -
Conjugate structure algebraic code excited linear prediction was approved as itu recommendation in 1996 based on the project of usa at & t, japan ntt, franc telecom and canada sherbrooke university. cs - acelp based on adapt linear prediction is one of the most sophisticate algorithms in the field of low bit rate speech coding
共軛結構代數碼激勵線性預測語音編碼（ conjugatestructurealgebraiccodeexcitedlinearprediction簡稱cs - acelp ）演算法是1996年國際電信聯盟（ itu ）根據美國at & t 、日本ntt 、法國電信和加拿大sherbrooke大學聯合提出的方案而制定的，它是最復雜低數碼率語音壓縮演算法之一。 -
However, performance is limited by the low signal - to - noise ( snr ) and high date rate. a potential solution is to add a strong error correcting code. so studying the error correcting code on uwb system is necessary and worthy
但是超寬帶信號頻譜寬、功率低且傳輸速率很高，使其更容易受到各種干擾而影響傳輸質量，所以在超寬帶系統中研究通道編解碼技術變得非常必要和有價值。 -
In the code division multiple access ( cdma ) system, the multiple access interference ( mai ) mitigation capability as well as system capacity are determined, to a great extent, by the correlation properties of spreading sequences ; while adaptive modulation and coding ( amc ) with high spectral efficiency is the key technique to obtain high speed and low symbol error rate ( ser ) performance in mobile data transmission
在碼分多址（ cdma ）系統中，擴頻序列的特性在很大程度上決定了抗多址干擾（ mai ）能力和系統容量，而高頻譜效率的自適應調制編碼（ amc ）技術則是獲得高速率和低誤碼率（ ser ）移動數據傳輸性能的關鍵因素。 -
In this thesis, a kind of software method is researched to realize the functions of fast acquisition, tracking and demodulation of pcm - cdma - bpsk intermediate frequency signals. conventional research on spread spectrum signals is in the case of ideal conditions, such as low code rate, narrow dynamic range, narrow frequency - changing range and so on
本論文將介紹一種軟體模擬硬體的方法來實現pcm - cdma - bpsk中頻信號的快捕、跟蹤和解調。關于擴頻信號的傳統的研究是在理想的條件下，比如低碼率、窄動態范圍、窄頻率變化范圍等等。
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