Feedforward control of an enclosed space with multiple incoherent excitations
AssigneeThe Boeing Company
InventorsSteven Griffin, Joshua Martin Montgomery
Life of this patent
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Abstract
A method for feedforward noise cancellation in an enclosed space within a structure is provided. The method comprises placing a microphone array inside an inner surface of the enclosed space and conducting modal testing on an outside surface of the enclosed space, wherein the modal testing comprises multiple incoherent noise sources corresponding to locations of microphones in the microphone array. Noise generated by the modal testing is processed to create a number of acoustic mathematical models of the enclosed space. In response to incoherent noise within the enclosed space, a noise canceling signal is generated according to an output of the mathematical models.
Claims20
A method for feedforward noise cancellation in an enclosed space within a structure, the method comprising:
- placing a microphone array inside an inner surface of the enclosed space;
- conducting modal testing on an outside surface of the enclosed space, wherein the modal testing comprises multiple incoherent noise sources corresponding to locations of microphones in the microphone array;
- processing noise generated by the modal testing to create a number of acoustic mathematical models of the enclosed space;
- and
- in response to incoherent noise within the enclosed space, generating a noise canceling signal according to an output of the acoustic mathematical models.
A noise cancellation system for an enclosed space within a structure, wherein the noise cancellation system comprises:
- a microphone array inside an inner surface of the enclosed space;
- a reference microphone within the enclosed space;
- an error microphone within the enclosed space;
- a control speaker configured to generate a noise canceling signal in response to incoherent noise within the enclosed space;
- and
- a controller configured to control the control speaker based upon a number of acoustic mathematical models based on modal tests on an outside surface of the enclosed space, wherein the modal tests comprise multiple incoherent noise sources corresponding to locations of microphones in the microphone array.
A method for feedforward noise cancellation in an enclosed space within a structure, the method comprising:
- placing a microphone array inside an inner surface of the enclosed space;
- conducting modal testing on an outside surface of the enclosed space, wherein the modal testing comprises multiple incoherent noise sources corresponding to locations of microphones in the microphone array;
- processing noise generated by the modal testing to create a first number of acoustic mathematical models of the enclosed space;
- placing an accelerometer array on an outer or inner surface of the structure;
- generating sound with an omnidirectional speaker inside the enclosed space;
- testing the structure via the accelerometer array via accelerations on the structure produced by the sound from the omnidirectional speaker;
- processing the accelerations generated by the testing to create a second number of acoustic mathematical models of the enclosed space;
- and
- in response to incoherent noise within the enclosed space, a control speaker generating a noise canceling signal according to an output of the acoustic mathematical models.
A feedforward noise cancellation system for an enclosed space within a structure, wherein the feedforward noise cancellation system comprises:
- a microphone array inside an inner surface of the enclosed space;
- a reference microphone within the enclosed space;
- an error microphone within the enclosed space;
- an accelerometer array on an outer or inner surface of the structure;
- an omnidirectional speaker within the enclosed space;
- a control speaker configured to generate a noise canceling signal in response to incoherent noise within the enclosed space;
- and
- a controller configured to control the omnidirectional speaker and the control speaker based upon a number of acoustic mathematical models based on modal tests on an outside surface of the enclosed space, wherein the modal tests comprise multiple incoherent noise sources corresponding to locations of microphones in the microphone array.
Dependencies are inferred from the claim text.