【作者】 戴玮；

【导师】 胡仁杰；

【作者基本信息】 东南大学 ， 电力电子与电力传动， 2004， 硕士

【摘要】 随着计算机通信技术的迅猛发展,语音信号处理技术的重要性日益突出,它被广泛的应用在网络、通信、智能仪表及工业控制领域中,语音信号处理技术已经成为现代工业发展的一个必备的基本技术。而在当今的高等院校中,局限于实验设备以及师资力量,除了特别的专业开设此门课程,语音信号处理技术尚未在工科院校普及。本论文所研究的是数字语音处理技术在DSP实验平台上的实现。论文分为两部分,第一部分是对数字语音技术理论上的研究。在对数字语音进行探讨的前提下,论文第二部分详细分析了在DSP实验平台上是如何具体实现对语音信号的处理。论文首先介绍了数字语音的发展概况,描述了数字语音与模拟语音区别。接下来阐述模拟语音是如何经过采样、量化、编码的方法转换成数字语音的。语音编码是本论文的核心理论基础,语音编码分为三类,波形编码、参数编码、混合编码。语音编码的国际标准,是实现语音编码的实施准则,论文首先对语音编码标准进行概况性的介绍,然后详细探讨了最实用最基本的编码方法PCM和ADPCM。数字滤波器也是语音处理技术的基础,本论文在对滤波器简要介绍的基础上,详细论述了IIR和FIR的原理,为后面介绍在DSP实验平台上实现提供了理论基础。上述的理论的具体实现是建立在DSP实验平台上的。实验平台上所涉及到的硬件,在论文第二部分给予了详细论述,包括硬件的连接和软件的实现等。在语音技术理论与DSP实验平台都被论证的基础上,如何在DSP实验平台上实现语音处理,在论文的最后被详细论述。这部分包括如何在实验平台上实现PCM编码、ADPCM编码算法以及如何具体实现滤波器IIR以及FIR,论文最后给出了最终的实现方法。更多还原

【Abstract】 With the development of the modern electrical technique, the value of the audio processing becomes important. Audio processing can be used in many places including network, telecom, intelligent instrument, industry control and so on. But audio processing has not become a subject in many schools for the lack of experiment equipment and skilled teachers. This thesis focuses on the implement of the digital audio processing in the DSP experiment kit. Two parts are described in the thesis, one is the theory of digital audio processing, and the other is the implement of digital audio processing in the experiment kit. The first part of the thesis makes a brief introduction of the audio process technique, includes its history and the difference to the analog audio. The theory, classes and standards of the audio compress is described in the following parts. The digital filter is the base of the audio processing, the theory and simulation of IIR filter and FIR filter is described in details after the brief introduction of each filter.The above theory is implemented in the DSP experiment kit. So the second part of the thesis is the description of the involved hardware and software about the experiment kit. The hardware includes the juncture of the chips and the involved bottom control codes. At the end of the second part, the source codes of implement the PCM algorithms, the ADPCM algorithms, IIR filter and FIR filter is presented after the theories of digital audio process and the DSP experiment kit.In the end of the thesis, a summary is presented and some suggestions are forward to improve the experiment kit.更多还原