·詳細說明：非常流行的C語言實現的G.729壓縮算法，很值得研究語音壓縮的開發者一看。-Implement the G.729 speech Vocoder by C programming language, worth of studying for the developer of speech vocoder. 文件列表: g729 ....\acelp
·詳細說明：使用凌陽單片機的多命令語音識別范例- The use insults the positive monolithic integrated circuit the multi- orders speech recognition model 文件列表: Recognise_SD ............\bsrSD.h ............\
·詳細說明：語音識別方面的開發包，有助于設計HMM，NN和VQ。它是開放源碼的。- The speech recognition aspect development package, is helpful to designs HMM, NN and VQ. It opens the source code.
在現代通信系統中，電話語音的頻帶被限制在300 Hz～4 kHz的范圍內，帶來了語音可懂度和自然度的降低。為了在不增加額外成本的前提下提高語音的可懂度和自然度，進行了電話語音頻帶擴展的研究。提出了一種改進的基于碼本映射的語音帶寬擴展算法：在碼本映射的過程中，使用加權系數來得到映射碼本。客觀測試結果表明，用此算法得到的寬帶語音的譜失真度比用一般的碼本映射降低至少2%。主觀測試結果表明，用此算法得到的寬帶語音具有更好的可懂度和自然度。
Abstract:
In modern communication systems， the bandwidth of telephone speech is limited from 300Hz to 4 kHz， which reduces the intelligibility and naturalness of speech. Telephone speech bandwidth extension is researched to get wideband speech and to improve its intelligibility and naturalness， without increasing extra costs. This paper put forward an improved algorithm of speech bandwidth extension based on codebook mapping. In the process of codebook mapping， weighted coefficients were used to get mapping codebook. Objective tests show that spectral distortion of wideband speech obtained by this algorithm reduces at least 2%， comparing to conditional codebook mapping. Subjective tests show that the wideband speech obtained by this algorithm has better intelligibility and naturalness.
