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

Claim 0:
1. A system for generating and injecting acoustic interference signals to mitigate undesired acoustic noise over a target zone, comprising:
a set of M pickup sensors for picking up acoustic noise signals from one or more noise sources in real time and generating M noise signals, M being an integer greater than 1;
a beam forming network having beam weight vectors (BWVs) and coupled to the M pickup sensors, the beam forming network comprising a set of M acoustic beam forming modules, each of the M acoustic beam forming modules receiving a respective one of the M noise signals and generating N intermediate signals, N being an integer greater than 1, the N intermediate signals generated by each of the M acoustic beam forming modules being combined respectively with corresponding intermediate signals generated by remaining M minus 1 acoustic beam forming modules to generate N acoustic interference signals; and
a set of N acoustic injectors coupled to the beam forming network for receiving, conditioning and amplifying the N acoustic interference signals, and injecting the N amplified acoustic interference signals over the target zone,
wherein each of the M acoustic beam forming modules comprises 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 transforming the respective one of the M noise signals into N signals, each of the N finite-impulse-response filters receiving a respective one of the N signals, performing weighting of amplitude and phase of frequency components of the respective one of the N signals and generating a respective one of the N intermediate signals, and
wherein the BWVs are updated based on signal strengths at the target zone.