Generating quiet zone by noise cancellation via injection techniques
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United States of America Patent
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Nov 28, 2017
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app pub date -
Nov 22, 2016
filing date -
Sep 2, 2010
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Abstract
A system for reducing undesired interference in a target zone is disclosed. The system comprises a set of M pickup sensors, a beam forming network coupled to the M pickup sensors, and a set of N injectors coupled to the beam forming network. The M pickup sensors pick up undesired signals in real time and generate M pickup signals, M being an integer greater than or equal to 1. The beam forming network comprises a set of M beam forming modules. Each of the M beam forming modules receives a respective one of the M pickup signals and generates N intermediate signals, N being an integer greater than 1. The N intermediate signals generated by each of the M beam forming modules are combined correspondingly with remaining intermediate signals generated by remaining M−1 beam forming modules to generate N interference signals. The N injectors receive and radiate the N interference signals to the target zone.
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