US 11,887,575 B2Granted

Generating acoustic quiet zone by noise injection techniques

AssigneeSpatial Digital Systems, Inc.

InventorsDonald C. D. Chang, Steve K. Chen

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Abstract

A system for generating and injecting acoustic interference signals to mitigate undesired acoustic noise over a target zone. M pickup sensors pick up acoustic noise signals from one or more noise sources in real time and generate M noise signals, M>1. A beam forming network includes M acoustic beam forming modules to process the M noise signals respectively and generate N acoustic interference signals. N acoustic injectors condition, amplify and inject the N acoustic interference signals over the target zone, N>1. Each of the M acoustic beam forming modules includes a 1-to-N distribution network to transform a respective one of the M noise signals into N signals, and N finite-impulse-response filters to perform amplitude and phase weighting on the respective N signals and generate N intermediate signals which are combined respectively with corresponding intermediate signals generated by remaining M−1 acoustic beam forming modules to generate the N acoustic interference signals.

Claims20

Dependent claims

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.

3 more elements

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.

7 more elements

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 smaller than or equal to M;
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 transmitting acoustic beam forming submodules configured to receive the P beam signals respectively, each of the P transmitting acoustic beam forming submodules 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 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.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/006,695Filed 12 Jun 2018 · continuation
Priority: 18 Jan 2011
Published: US 2018/0292539 A111 Oct 2018
Granted: 30 Jan 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G10K 11/17857
Methods, e.g. algorithms; Devices: geometric disposition, e.g. placement of microphones
G01S 19/215
Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service: issues related to spoofing
G10K 11/348
Circuits therefor: using amplitude variation
G10K 11/34
Sound-focusing or directing, e.g. scanning: using electrical steering of transducer arrays, e.g. beam steering

Family

Application13/008,833Parent of this continuation · filed 18 Jan 2011
US 2018/0292539 A1Pre-grant publication · published 11 Oct 2018
US 9,995,828 B2Parent of this continuation
US 2012/0057716 A1Published application
US 11,887,575 B2This patent

From the US filing history. Foreign family members aren’t listed.