Digital technology is a new technology, so digital audio has developed to solve the distortion problem of analog audio noise. After the use of digital technology in the audio system, the recorded digital signals have clear resolution from sampling frequency to quantization characteristics, without color jitter, resulting in a very clear image. And it can be interchanged with the upper computer, which is incomparable to analog recording and playback devices. Digital recording can record the time, person name, and address into the tape, and use a micro keyboard to complete the cataloging work. By changing the track number, and adding remote control function, you can automatically search for the desired track, making it convenient to use.