"基于凌阳单片机的数码录音与播放系统设计与实现"

The demand for products with digital recording and playback capabilities is constantly increasing in various industries such as industrial, transportation, and communication. In order to better meet the needs of people's daily life and work, this paper adopts Lingyang microcontroller as the core, uses a microphone to receive the voice signal, and uses a memory to store the voice information, thus realizing the functions of recording and playback. This system can be applied to situations that require longer recordings, such as self-recording voice prompts, temperature detection storage and playback systems, etc. The hardware circuit design of this system mainly includes the MIC recording circuit, the DAC playback circuit, the button circuit, the reset and clock circuit, and the external W29C040 memory expansion circuit. The voice signal is first processed through capacitor and resistor components, sent to a pre-amplifier and internal integrated automatic gain control (AGC) processing, and then used for recording. The DAC playback part amplifies the voice through the voice integrated amplifier SPY0030A, and then connects to a speaker, realizing the function of voice recording and playback. The microcontroller used in this system has the advantages of small size, high integration, easy expansion, and strong interrupt handling capability. In conclusion, with the continuous development of voice processing technology, the demand for products with digital recording and playback functions continues to grow. This paper presents a design of a digital recording and playback system based on a microcontroller. The system uses Lingyang microcontroller as the core, and implements the functions of recording and playback by using a microphone to receive the voice signal and a memory to store the voice information. The system can be applied to various scenarios that require longer recordings, providing convenience and practicality for people's daily life and work.