發(fā)布時(shí)間：2017-12-27 05:01

  本文關(guān)鍵詞：無線透地通信語音壓縮與識(shí)別的研究　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 無線透地通信 語音壓縮編碼 MELP 編碼速率 噪聲干擾

【摘要】：本課題來源于“山西省自然科學(xué)基金資助項(xiàng)目(2013011019-2):用于礦井救災(zāi)穿透地層無線信道的研究”。我國(guó)有著豐富的礦產(chǎn)資源儲(chǔ)量。其中,煤炭資源作為一種燃料資源,長(zhǎng)年以來在我國(guó)社會(huì)經(jīng)濟(jì)發(fā)展中扮演了重要的角色。我國(guó)煤炭年開采量一直處于世界領(lǐng)先位置。在煤炭生產(chǎn)過程中,安全事故的時(shí)有發(fā)生,使得研究與發(fā)展能用于礦井的無線透地通信救災(zāi)系統(tǒng)成為一種迫切需要。而無線透地通信不同于有線通信,或地面上的無線通信,由于信號(hào)傳輸需要穿透地層的這個(gè)特殊性,使得其通信信道資源十分緊張。關(guān)于無線透地通信的研究也因諸如此類的原因,進(jìn)展一直較為緩慢。本文以無線透地通信系統(tǒng)原理為基礎(chǔ),立足于當(dāng)代通信技術(shù)的發(fā)展,針對(duì)在信源端對(duì)語音信號(hào)進(jìn)行壓縮以確保語音信號(hào)高效傳輸并由此節(jié)約信道資源的問題,提出了將一種低編碼速率MELP(Mixed Excitation Linear Prediction)編碼算法應(yīng)用于礦井無線透地通信,并以MELP為基礎(chǔ)提出了兩種編碼速率更低的壓縮方案。其主要工作內(nèi)容如下:(1)論述了無線透地通信系統(tǒng)的相關(guān)原理,并對(duì)通信信道的特性做了分析,得出了無線透地通信系統(tǒng)中傳輸語音信號(hào)的工作頻率范圍;分析了無線透地通信中存在的干擾種類以及降低干擾影響的途徑。(2)通過對(duì)相關(guān)理論基礎(chǔ)的分析,本文提出將MELP應(yīng)用于礦井無線透地通信中。論述了語音產(chǎn)生模型及編碼算法基礎(chǔ),針對(duì)實(shí)現(xiàn)MELP的基礎(chǔ)技術(shù)制定了部分算法參數(shù)。(3)指出了MELP編碼速率低但合成語音質(zhì)量高的技術(shù)關(guān)鍵點(diǎn),建立了MELP聲碼器,進(jìn)行了詳細(xì)的MELP編碼算法設(shè)計(jì)分析,制定了編碼算法的仿真參數(shù)。(4)對(duì)MELP語音編碼算法在礦井無線透地通信中的應(yīng)用進(jìn)行了仿真驗(yàn)證,并以此為基礎(chǔ)提出了兩種速率更低的編碼方案:2.044kb/s和1.8kb/s。此兩種改進(jìn)方案出發(fā)點(diǎn)和著眼點(diǎn),是基于降低每幀發(fā)送的比特?cái)?shù)及縮短每幀幀長(zhǎng)這兩種手段。得出結(jié)論表明,將MELP語音編碼應(yīng)用于礦井無線透地通信中的方案是可行的,基于MELP的2.044kb/s和1.8kb/s的編碼方案,其合成語音質(zhì)量有明顯降低,但可被人為主觀識(shí)別�？筛鶕�(jù)實(shí)際情況將其作為語音編碼的備選方案應(yīng)用于無線透地通信中。本課題的研究結(jié)論,對(duì)無線透地通信中如何選擇語音壓縮編碼方案具有一定的指導(dǎo)意義,也為語音編碼方案的應(yīng)用提供了部分理論基礎(chǔ),具有一定可行性和實(shí)用性。
[Abstract]:This project comes from the project of Shanxi Natural Science Fund (2013011019-2): the research on the wireless channel of mine disaster relief through stratum. There are abundant reserves of mineral resources in our country. As a kind of fuel resources, coal resources have played an important role in the social and economic development of our country for a long period of year. The annual coal mining in China has always been in the leading position in the world. In the process of coal production, safety accidents happen, so it is an urgent need to study and develop the wireless communication disaster relief system which can be used in the mine. And wireless ground penetrating communication is different from wired communication or wireless communication on the ground. Because of the particularity of signal transmission, the resource of communication channel is very intense. The research on wireless ground communication has also been slow because of such reasons. Based on the wireless through the earth communication system based on the principle, based on the development of contemporary communication technology, aiming at the source end of the voice signal compression to ensure efficient transmission of voice signal and thus save the channel resources, put forward a low encoding rate of MELP (Mixed Excitation Linear Prediction) encoding algorithm to mine wireless transmission application communication and MELP based compression scheme is proposed for two lower encoding rate. The main contents are as follows: (1) discusses the principle of wireless through the earth communication system, and the characteristics of the communication channel is analyzed, obtained through the wireless frequency range of voice signal transmission communication system; through analysis of wireless communication in the presence of interference types and ways to reduce the interference. (2) through the analysis of the theoretical basis of the relevant theory, this paper puts forward the application of MELP to the mine wireless transmission of ground communication. The speech generation model and the foundation of the coding algorithm are discussed. Some algorithm parameters are formulated for the basic technology to realize the MELP. (3) points out the key points of MELP encoding rate, but the quality of synthesized speech is high. The MELP vocoder is established, and the detailed MELP coding algorithm is designed and analyzed, and the simulation parameters of the encoding algorithm are worked out. (4) the application of MELP speech coding algorithm in the mine wireless ground penetrating communication is simulated and verified. Based on it, two low rate coding schemes: 2.044kb/s and 1.8kb/s are put forward. The starting point and the eye point of the two improvements are based on the two means of reducing the number of bits sent per frame and shortening the frame length of each frame. The conclusion shows that it is feasible to apply MELP speech coding to mine wireless ground penetrating communication, and the coding scheme of 2.044kb/s and 1.8kb/s based on MELP has obvious reduction in synthetic speech quality, but it can be identified by human. According to the actual situation, it can be used as a speech coding alternative in wireless transmission of ground communication. The research conclusion of this study has some guiding significance for how to choose speech compression coding scheme in wireless earth penetrating communication, and also provides some theoretical basis for the application of speech coding scheme, which is feasible and practical.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN912.3;TN92

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