关键字：单片机小系统；外部中断；A/D转换；D/A转换；IAP；DPCM
Abstract
Voice processing is an important branch of information science. The technology has improved a lot with the high development of the large scale integration technology and the computer science technology. As the rapid development of digital audio technology and multi-media technology, the traditional tape desk is facing challenge for it unclear replaying and inconvenient. Our design, digital voice storage and replay system, proposed the volume is exquisite, the power loss low. It can solve the limitation of the tradition voice system in electronic and information processing usage.
The article has presenting a single-chip system with SST89E554RC chip as it center processing .The MCU(microcontroller) system is used to control the logic of the digital voice storage and replay system. When the voice system is in it storage state, the MCU system will send the digital signal to the RAM from the ADC (Analog to Digital Converter). When in the state of replaying, the MCU system will read the signal from the RAM (Random Access Memory), and then, send the signals into DAC (Digital to Analog Converter). After this, the signals will change into analog signal. The system has designed the keyboard selecting compression method, LCD indicating. It can also realize the real-time storing and replaying, and the surface is very friendly. The local test indicates this system satisfied basically designing required.
The article emphasizes the designing process of the MCU system, the flow of the hardware and the debugging of software. Compression coding method, which is used to solve the limited room of the RAM, is also emphasized in it.
Keywords: MCU system; external interrupt; ADC; DAC; IAP; DPCM
