Acoustic impedance adjustment device and adjustment method based on adaptive micro-perforated plate sound absorber
A technology of micro-perforated plates and adjustment devices, which is applied in the direction of sound-generating devices and instruments, can solve the problems of inability to use micro-perforated plates, increase material and processing costs, and space distance limitations, and achieve simple structure and manufacturing process, and effective expansion The effect of absorbing sound frequency and saving occupied space
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[0047] Below in conjunction with accompanying drawing, the present invention will be further described, and the present invention is applicable to single-layer or multi-layer piezoelectric film micro-perforated sound absorbers:
[0048] Such as figure 1 Shown is an acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber, the adjustment device includes a noise detector 100, an adaptive controller 200, a piezoelectric film drive circuit 300, and a piezoelectric film micro-perforated plate sound-absorbing Body 400. The adaptive controller 200 includes a signal analysis module 201 and an impedance adjustment signal calculation module 202 . The piezoelectric film drive circuit 300 includes a dual-channel DC stabilized power supply 301 , a signal amplifier circuit 302 and an audio transformer 303 . The dual-channel DC stabilized power supply 301 is used to supply power to the signal power amplifier circuit 302 . The piezoelectric film micro...
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