The whole system is composed of DSP, BRF6100, audio AD/DA, LCD, keyboard and Flash. DSP is the core control unit, and audio AD is used to convert the collected analog voice signal into digital voice signal; Audio DA converts digital voice signals into analog voice signals and outputs them to headphones or speakers. The Frontend and backend and the back end of audio AD and DA have amplification and filtering circuits. Generally, audio AD and DA are integrated into one chip. The system uses the TLV320AIC10 of TI company, sets the sampling frequency to 8KHz, the keyboard is used for input and control, the LCD displays various information, and Flash saves the program required by DSP for power on call of DSP; JTAG is a simulation interface for DSP, which also provides an HPI port. This interface can connect to a computer, download files from the computer and play them through DA, or transmit digital voice signals to the computer for storage and processing.