Methods and apparatus for providing privacy for a user of an audio electronic device

This invention describes a device designed to keep your phone conversations private. It works by taking your voice from a microphone and generating an 'antivoice' sound that actively cancels it out, playing this through a speaker to create a small, quiet zone around you. The claims specify this antivoice signal is derived directly from your own voice, with a delay adjusted for distance.

Why it matters: Filed before modern digital signal processing and miniaturized components made real-time acoustic cancellation practical for personal devices. Current mobile processing power can now handle the complex algorithms required.

Status: ExpiredProtection ended and was never renewed
How hard to build: SpecializedReal-time acoustic signal processing

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