"声音逼真度" can be translated into English as "sound fidelity" or "audio fidelity".
"Sound fidelity" is a common term used to describe how accurately a sound reproduction system (such as speakers, headphones, or audio recordings) reproduces the original sound.
"Audio fidelity" is another variation that emphasizes the fidelity or accuracy of the audio signal.
Both terms are widely accepted and used in the field of audio engineering and consumer electronics.