Wirelessly powered audio devices

This invention describes audio devices like headphones that can receive power wirelessly. The unique part is that these devices include special circuits to detect and then remove any unwanted noise that might be introduced into the audio signal specifically because of the wireless power transfer. This noise can be filtered out using either a specific frequency filter or active noise cancellation technology.

Why it matters: Since 2017, advancements in miniaturized active noise cancellation (ANC) and digital signal processing (DSP) have made the claimed noise filtering more effective and power-efficient for small audio devices, particularly for mitigating electromagnetic interference from wireless power.

Status: ExpiredProtection ended and was never renewed
How hard to build: ModerateWireless power receiver, noise detection, filtering circuits

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