Patent ID: 11887575
Assignee: SPATIAL DIGITAL SYSTEMS, INC.
Field: Other consumer goods (Other fields)
Classification: CPC G | IPC G

Claim 7:
8. A method for generating and injecting acoustic interference signals to mitigate undesired acoustic noise over a target zone, the method comprising:
providing a set of M pickup sensors configured to pick up acoustic noise signals from one or more noise sources in real time and generate M noise signals, M being an integer greater than 1;
providing a beam forming network having beam weight vectors (BWVs) and coupled to the M pickup sensors, wherein providing the beam forming network comprises:
providing a receiving acoustic beam forming module configured to receive the M noise signals and generate P beam signals, P being an integer greater than or equal to 1; and
providing a transmitting acoustic beam forming module configured to receive the P beam signals and generate N acoustic interference signals, N being an integer greater than 1; and

providing a set of N acoustic injectors coupled to the transmitting acoustic beam forming module, each of the N acoustic injectors being configured to receive a respective one of the N acoustic interference signals and inject the respective one of the N acoustic interference signals over the target zone,
wherein providing the transmitting acoustic beam forming module comprises:
providing P acoustic beam forming submodules configured to receive the P beam signals respectively, each of the P acoustic beam forming submodules comprising a 1-to-N distribution network and N finite-impulse-response (FIR) filters having FIR weights as components of the BWVs and coupled to the 1-to-N distribution network, the 1-to-N distribution network being configured to transform the respective one of the P beam signals into N signals, each of the N finite-impulse-response filters being configured to receive a respective one of the N signals and perform weighting of amplitude and phase of frequency components of the respective one of the N signals, and

wherein the BWVs are updated based on signal strengths at the target zone.