基于1比特技术数字音频功率放大器设计
发布时间：2018-10-09 20:29
【摘要】：随着电子技术和数字信号处理技术的发展，音频功率放大器的发展也进入了一个新的时代，数字功率放大器相对于模拟功放具有高效率、保真度高、功放和扬声器的匹配好等优点，但目前应用较为广泛的数字音频功放为PWM(脉冲宽度调制)功放结构，它在将信号解调的过程中，会产生误差，，同时信号的输出波形不够平滑，噪声较高，对信号的恢复程度较弱。 针对此类问题，本文采用以DSP为核心设计的数字音频功率放大器模块，利用内插算法和调制算法实现1比特激励信号的输出，替代传统的PWM转化过程。同原有的PWM数字化设计方式相比，本方案可以减小失真，降低噪声，在高音质输出方面有较好的设计效果。 本文是对数字音频大功率放大系统的设计及研究，适用于广场、会议室等场合，具有对音频系统及音频效果需求较高的特点。结合现阶段数字功率放大器的相关技术及未来的发展动态，针对课题需求，应用DSP实现数字功放的1比特激励信号，并配合相应的外围电路，完成系统的供电、保护等模块的设计。 结合系统设计需求，选择一款合适的核心处理器，TI公司的67XX系列DSP以其在数字信号处理上的优势和先进的芯片性能可以比较容易的实现该设计的主要功能，完成系统中重要的内插和调制模块，并可以通过其丰富的外设接口完成数据的输入和输出。开发过程中利用TI的软件开发平台CCS组织DSP系统的软件结构，并通过CCS观察和验证算法在DSP内的实现情况。 论文阐述了系统方案的设计目的及任务，研究了1比特技术的相关算法，完成了各模块电路的硬件设计及软件设计，并对音频输出信号进行分析，完成系统整体性能测试，最后总结系统设计的总体情况，提出了设计的相关改进工作和项目发展方向。
[Abstract]:With the development of electronic technology and digital signal processing technology, the development of audio power amplifier has entered a new era. Compared with analog power amplifier, digital power amplifier has high efficiency and high fidelity. The power amplifier and loudspeaker match well, but the widely used digital audio power amplifier is PWM (Pulse width Modulation) power amplifier structure, it will produce error in the process of demodulating the signal, and the output waveform of the signal is not smooth enough. The noise is high and the recovery degree of the signal is weak. To solve this problem, a digital audio power amplifier module with DSP as the core is adopted in this paper. The output of 1-bit excitation signal is realized by interpolation algorithm and modulation algorithm, instead of the traditional PWM conversion process. Compared with the original PWM digital design method, this scheme can reduce distortion and noise, and has better design effect in the aspect of high-tone output. This paper is about the design and research of digital audio high-power amplifier system, which is suitable for the situation of square and conference room, and has the characteristics of high demand for audio system and audio effect. Combined with the related technology of digital power amplifier at present and the development trend in the future, according to the demand of the subject, we use DSP to realize the 1-bit excitation signal of digital power amplifier, and cooperate with the corresponding peripheral circuit to complete the power supply of the system. Protection module design. According to the requirement of system design, it is easy to realize the main function of this design by choosing a suitable core processor, 67XX series DSP of TI Company, because of its advantages in digital signal processing and advanced chip performance. The important interpolation and modulation modules in the system are completed, and the data input and output can be completed through its rich peripheral interface. In the process of development, the software structure of DSP system is organized by CCS, a software development platform of TI, and the realization of the algorithm in DSP is observed and verified by CCS. This paper describes the design purpose and task of the system, studies the related algorithms of 1-bit technology, completes the hardware design and software design of each module circuit, and analyzes the audio output signal to complete the overall performance test of the system. Finally, the general situation of the system design is summarized, and the related improvement work and the project development direction are put forward.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN722.75
本文编号：2260675
[Abstract]:With the development of electronic technology and digital signal processing technology, the development of audio power amplifier has entered a new era. Compared with analog power amplifier, digital power amplifier has high efficiency and high fidelity. The power amplifier and loudspeaker match well, but the widely used digital audio power amplifier is PWM (Pulse width Modulation) power amplifier structure, it will produce error in the process of demodulating the signal, and the output waveform of the signal is not smooth enough. The noise is high and the recovery degree of the signal is weak. To solve this problem, a digital audio power amplifier module with DSP as the core is adopted in this paper. The output of 1-bit excitation signal is realized by interpolation algorithm and modulation algorithm, instead of the traditional PWM conversion process. Compared with the original PWM digital design method, this scheme can reduce distortion and noise, and has better design effect in the aspect of high-tone output. This paper is about the design and research of digital audio high-power amplifier system, which is suitable for the situation of square and conference room, and has the characteristics of high demand for audio system and audio effect. Combined with the related technology of digital power amplifier at present and the development trend in the future, according to the demand of the subject, we use DSP to realize the 1-bit excitation signal of digital power amplifier, and cooperate with the corresponding peripheral circuit to complete the power supply of the system. Protection module design. According to the requirement of system design, it is easy to realize the main function of this design by choosing a suitable core processor, 67XX series DSP of TI Company, because of its advantages in digital signal processing and advanced chip performance. The important interpolation and modulation modules in the system are completed, and the data input and output can be completed through its rich peripheral interface. In the process of development, the software structure of DSP system is organized by CCS, a software development platform of TI, and the realization of the algorithm in DSP is observed and verified by CCS. This paper describes the design purpose and task of the system, studies the related algorithms of 1-bit technology, completes the hardware design and software design of each module circuit, and analyzes the audio output signal to complete the overall performance test of the system. Finally, the general situation of the system design is summarized, and the related improvement work and the project development direction are put forward.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN722.75
【参考文献】
相关期刊论文 前10条
1 周浩;曹先国;李家会;;一种高阶1 bit插入式∑-Δ调制器的设计[J];半导体技术;2007年02期
2 汪春梅;张崇明;李蕊;朱品昌;;TMS320DM642多媒体处理系统中高性能音频功能的实现[J];电声技术;2006年06期
3 倪磊;;D类音频功率放大器的分析和设计要素[J];电子与封装;2008年06期
4 王妍;刘帅威;金丽洁;;基于D类放大的高效率音频功率放大器设计[J];电子设计工程;2011年11期
5 栾彦利;张超英;;DSP与AIC23B通信系统设计[J];广西轻工业;2007年05期
6 于泽琦;樊养余;史龙飞;吕国云;;一种用于数字D类功放的伪自然采样算法[J];电子与信息学报;2014年03期
7 卢学燕;;音频功率放大器设计及实现概述[J];计算机光盘软件与应用;2014年16期
8 周嵩岑;张金鑫;王肖芬;;基于DSP语音识别系统的硬件设计[J];电子技术;2012年08期
9 董安明;;利用TMS320C6713 DSK实现的自适应滤波器[J];河西学院学报;2010年02期
10 蒋正萍;巫丛平;李寿强;;一种高效率数字音频功放芯片的设计与实现[J];微电子学;2011年04期
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