（毕业设计论文）《数字化语音存储与回放系统设计》.doc

- PAGE II- 摘 要 语音信号处理属于信息科学的一个重要分支，大规模集成技术的高度发展和计算机技术的飞速前进，推动了这一技术的发展。在数字音频技术和多媒体技术迅速发展的今天，传统的磁带语音录放系统因体积大、使用不便、放音不清晰而受到了巨大挑战。本组提出的体积小巧，功耗低的数字化语音存储与回放系统，可以有效的解决传统的语音录放系统在电子与信息处理的使用中受到的限制。 本文提出了以SST89E554RC芯片为核心的单片机小系统，用它来实现整个数字化语音存储与回放系统的逻辑控制。单片机将通过模数转换器A/D转换的数字信号送入外部存储器中，在回放时，单片机再从存储器中读出，送到数模转换器D/A转换成模拟信号输出。系统采用了键盘选择压缩方式，在字符型显示器上显示，并可实现实时语音存储与回放，性能稳定，并且界面友好。多次的测试实验表明，本系统基本满足设计要求。文中重点讨论了小系统的设计过程、硬件流程和软件的调试问题，研究了采用DPCM编码方式以解决因存储空间不够而引起的存储时间不够的问题。 关键词 单片机小系统,模/数转换,数/模转换,程序运行中编程,差值编码 Abstract The speech signal processing belongs to an important branch of information science, large-scale integration technology development and the height of the rapid progress in the computer technology, promote the development of this technology. In digital audio technology and multimedia technology rapid development, the traditional tape voice recording system for large size, use inconvenience, playback not clear and a huge challenge. Group of small size, low power consumption of digital voice storage and playback system, can effectively solve the traditional voice recording system in electronic and information processing in the use of the limit. In SST89E554RC chip is proposed in this paper is the core of singlechip processor system, using it to make the digital voice storage and playback system logic control. Adc chip will be through the A/D conversion of digital signals into the external memory chip in A replay, and again from memory to read, dac D/A converted into analog signal output. System USES a keyboard, choose compression in the character screen display, and can realize real-time speech storage and playback, stable performance, and friendly interface. Many of the test experiments show that this system basically meet the design requirements. In this paper, the design process of small system, hardware and software of debugging process, research using DPCM coding method to solve the lack of storage space for storage time enough to cause problems. Key Words Singlechip processor s