本文選題：G.726標(biāo)準(zhǔn) + ADPCM��； 參考：《華中科技大學(xué)》2014年碩士論文

【摘要】：隨著通信和移動(dòng)互聯(lián)網(wǎng)的發(fā)展，語音編碼的發(fā)展速度越來越快，國(guó)際電信聯(lián)盟也在不斷的更新編碼方案，G.726是國(guó)際電信聯(lián)盟建議的一種波形編碼方式，其特點(diǎn)是編碼語音質(zhì)量高，延時(shí)短，穩(wěn)定性好。G.726是基于ADPCM(自適應(yīng)差分脈沖編碼調(diào)制)算法的，將標(biāo)準(zhǔn)的G.711輸出信號(hào)進(jìn)行再壓縮。G.726是一種非常有效的語音波形編碼方案，本文就旨在設(shè)計(jì)一個(gè)G.726編碼系統(tǒng)，實(shí)現(xiàn)語音的采集、編解碼、播放、存儲(chǔ)、傳輸?shù)裙δ堋?本文重點(diǎn)研究建議中的各個(gè)算法模塊在DSP上的實(shí)現(xiàn)。該設(shè)計(jì)將編碼算法從整體上劃分為自適應(yīng)量化和自適應(yīng)預(yù)測(cè)兩個(gè)模塊：在自適應(yīng)量化模塊中，，分別實(shí)現(xiàn)了輸入PCM格式轉(zhuǎn)換、差分信號(hào)計(jì)算、量化定標(biāo)因子自適應(yīng)、自適應(yīng)速度控制、單音信號(hào)和轉(zhuǎn)移（瞬變）檢測(cè)以及自適應(yīng)量化6個(gè)子算法；在自適應(yīng)預(yù)測(cè)模塊中，實(shí)現(xiàn)了反向自適應(yīng)量化、自適應(yīng)預(yù)測(cè)和重建信號(hào)子算法。文中詳細(xì)敘述了算法的硬件實(shí)現(xiàn)方案，并從成本，可靠性上都做了考慮，力爭(zhēng)朝產(chǎn)品化和商業(yè)化上發(fā)展。本文嚴(yán)格遵循ITUG.726標(biāo)準(zhǔn)，按照標(biāo)準(zhǔn)的建議用MATLAB驗(yàn)證了每一編碼模塊，并創(chuàng)新地對(duì)算法進(jìn)行了優(yōu)化，滿足編碼算法MOS得分，算法驗(yàn)證符合要求后將其移植到DSP系統(tǒng)中，同時(shí)在一個(gè)系統(tǒng)中實(shí)現(xiàn)多種速率編碼，很好的完成了一個(gè)G.726編碼系統(tǒng)。
[Abstract]:With the development of communication and mobile Internet, speech coding is developing more and more rapidly, and the International Telecommunication Union (ITU) is constantly updating its coding scheme (G.726), which is a waveform coding method recommended by the International Telecommunication Union (ITU), which is characterized by the high quality of encoded speech. The delay is short, the stability is good. G. 726 is based on ADPCM (Adaptive differential Pulse Code Modulation) algorithm. Recompressing the standard G.711 output signal. G. 726 is a very effective speech waveform coding scheme. The purpose of this paper is to design a G.726 coding system. Achieve voice acquisition, codec, play, storage, transmission and other functions. This paper focuses on the implementation of the proposed algorithm modules on DSP. In this design, the coding algorithm is divided into two modules: adaptive quantization and adaptive prediction. In the adaptive quantization module, the input PCM format conversion, the difference signal calculation, the quantization scaling factor adaptation are realized, respectively. Adaptive speed control, single tone signal and transfer (transient) detection and adaptive quantization are 6 subalgorithms. In the adaptive prediction module, reverse adaptive quantization, adaptive prediction and reconstruction signal subalgorithms are implemented. In this paper, the hardware implementation scheme of the algorithm is described in detail, and the cost and reliability are considered in order to develop towards production and commercialization. According to the standard ITUG.726, this paper verifies every coding module with MATLAB, and innovatively optimizes the algorithm to satisfy the MOS score of the coding algorithm. The algorithm is transplanted to DSP system after the verification of the algorithm meets the requirements. At the same time, in a system to achieve a variety of rate coding, a good completion of a G.726 coding system.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN912.3

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本文編號(hào)：2091990