DBEE is a dynamic bass sound effect independently developed by OPPO in 2007. Its full English name is Dynamic Bass Enhanced Engine, that is, Dynamic Bass Enhancement Engine. It is a sound effect that can dynamically improve the bass effect, and can enhance the bass of the sound, especially the human voice. This enhancement is based on the amplitude of the original sound, similar to the normal function, and is essentially different from the traditional improvement principle of the bass proportional function. DBEE sound effect is an intelligent sound effect adjustment, which is installed in OPPO brand mp3 and the latest intelligent MP4. The sound effect of DBEE is characterized by good and real bass, which simulates the real attenuation law of sound propagation in nature and can provide users with realistic live sound perception.