Abstract: The present disclosure is related to a surround-screen speaker array and a formation method of sound sources. The surround-screen speaker array includes a plurality of speaker subarrays that are disposed around a sound-proof screen tightly and uniformly. The speaker subarrays disposed around the sound-proof screen successfully provides a solution to reinforcement sound of a main sound channel for a movie screen that adopts a sound-proof material. Therefore, it is possible that the sound-proof screen can be used as the movie screen.

Abstract: The disclosure relates to a mesh-head electronic drum, including a drum base, a drum head, a data acquisition module and a data processing module, wherein the data acquisition module includes a trigger unit and a conduction medium, the conduction medium is a magnetic unit, the magnetic unit is arranged on the drum head, and the trigger unit includes a Hall sensor coupled with the magnetic unit in a non-contact way. The disclosure is advantageous in that the trigger unit and the conduction medium have no direct contact with each other and thus no bad contact is caused, but an accurate audio signal can still be generated.