▎ 摘　　要

NOVELTY - The speaker has a driving circuit that includes a filter module and a modulator module and a booster circuit that are electrically connected in sequence. The filter module includes a filter A module and a filter B module, whose output terminals are connected to each other. The output end of the filter B module is connected to the input end of the modulator module, and the output end of the booster circuit is connected to the input end of the graphene. The filter module receives the acoustic digital input signal, completes the upsampling of the digital input signal, and simultaneously filters out-band noise introduced by the upsampling. The modulator module receives the signal processed by the filter module, and outputs a pulse density modulation signal. The booster circuit boosts the voltage of the pulse density modulation signal output from the modulator module and transmits to graphene to ensure that graphene accurately emits sound. USE - Graphene speaker. ADVANTAGE - Since one piece of graphene sheet replaces the entire sounding device, the area of speaker is greatly reduced. The speaker can be even developed into a flexible wearable electronic device, so that the sound pressure level of the sound and the distortion of the speaker are improved. DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the driving circuit of graphene speaker. (Drawing includes non-English language text)