Nanosecond pulse discharge has many advantages in sound production. For example

it owns wider frequency domain response and smaller components

and is suitable for some harsh surrounding environments

etc. In the field of nanosecond pulse air discharge

the researches on the relationship between electrical signal and acoustic signal and the principle of sound generation are rarely available in the literature. In this paper

an experimental platform for electrical and acoustic joint diagnosis was built. The electrical and acoustic signals were collected in real time under different pulse discharge energy and discharge gap distances

and the variation law of the peak sound pressure with different experimental parameters was summarized. The experimental results show that a single nanosecond pulse air discharge can produce pulse sound wave with microsecond pulse width. The amplitude of pulse sound pressure increases with the increase of pulse discharge energy and gap distance. The peak value of sound pressure increases by about 3 Pa for every 1 m J of pulse discharge energy

and about 20 Pa for every 1 mm gap distance. Based on the experimental results

the wave equation of gas pressure in the process of sound generation is introduced

and a mechanism assumption of conversion from electricity to sound in nanosecond pulse discharge is proposed.