A kind of active and passive collaborative near-field stealth sound field system and implementation method

Abstract

The application discloses a kind of active and passive collaborative near-field stealth sound field system and implementation method, belong to acoustic privacy, mobile terminal and vehicle-mounted acoustic technical field.This system takes mobile terminal, mobile terminal protective shell and vehicle-mounted cabin as carrier, realizes frequency band convergence and sound energy attenuation to wideband human voice by passive acoustic processing module, cooperates active acoustic processing module to carry out anti-phase interference cancellation to narrowband signal, and eliminates structural vibration, gap leakage sound and reverberation by residual energy dissipation module, forms stable near-field stealth sound field around user mouth.System is automatically triggered according to communication state, only suppresses human voice to spread outward, does not interfere with normal pickup microphone, so that human voice attenuates to below ambient noise in preset distance and cannot be identified.The application has good universality, stable privacy protection effect, low power consumption, easy to integrate, can be adapted to terminal built-in, vehicle-mounted cabin, protective shell peripheral form, etc., and can also be applied to wearable audio and video equipment and other scenes.

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