【作者】 布占伟；

【导师】 李广鑫；

【作者基本信息】 西安电子科技大学 ， 计算机系统结构， 2010， 硕士

【摘要】 传统二胡作为中国最具代表性的民族乐器,是中国民族乐器复兴与发展的良好载体,被广大群众接受。但是传统二胡存在制作工艺复杂,成本高,耗费蟒皮、红木等珍贵动植物资源等特点,发展受到严重限制,给二胡的推广和产业化带来很大困难。本文提出了一种电声二胡的设计方案,有效的克服了传统二胡的缺点,能够还原传统二胡声音,并实现延时、镶边和合奏等音效以及大厅、中厅和小厅的混响效果。本论文主要研究基于ARM的嵌入式系统在电声二胡的应用,从硬件和软件两方面详细介绍了嵌入式系统的设计开发过程及其中涉及到的相关技术。系统硬件控制平台的研究主要包括：S3C2440微处理器的体系结构,数字音频处理芯片UDA1431的结构和功能,以及Mini2440开发板的应用；系统软件运行平台的研究主要包括：μC/OS-II操作系统的移植工作,μC/OS-II环境下UDA1431接口程序的设计,数字音效处理技术的实现等工作。本系统将电声二胡的声音信号通过电子拾音传送至嵌入式系统开发板,并将模拟信号进行A/D转换成数字信号,经过数字音效处理技术处理后,再有D／A转换器将数字信号转换成模拟信号的音频输出,实现了基于Mini2440开发板的ARM嵌入式系统电声二胡的功能。更多还原

【Abstract】 As the most representative Chinese national musical instrument, traditional erhu is a good carrier of development and revival of Chinese national musical instruments, and accepts by the public. However, there are some drawbacks about traditional erhu, such as manufacturing is complicated and costly, consuming skin of python, mahogany and other valuable resources of plant and animal. The development of traditional erhu is severely restricted, so that the industrialization and promotion of erhu faces to great difficulties. This thesis presents a design of acoustic erhu, which effectively overcomes the shortcomings of traditional erhu. This design can restore the sounds of traditional erhu, and realize the sound effects of delay, flanger and ensemble, and the reverberation effects of the hall, central hall and small hall.This thesis mainly studys the application of embedded system based on ARM in electroacoustic erhu. It introduces the designing process of embedded system and related technologies in detail from the aspects of hardware and software. The study of control platform of system hardwares includes:S3C2440 microprocessor architecture, the structure and function of digital audio processing chip UDA1431, and application requirements of Mini2440 development board; the study of running Platform of system softwares includes:working mechanism ofμC/OS-II operation system, UDA1431 driver design onμC/OS-II, electronic pickup, realization of digital sound effect processing technology and so on.This system will transfer electroacoustic erhu signals to the embedded system development board by electronic pickuper, and convert analog signals to digital signals by an A/D converter, and then output analog audio signals converted by a D/A converter from digital signals processed with digital sound effect processing, to realize the functions of electroacoustic erhu on ARM embedded system with Mini2440 development board.更多还原