System and method for noise cancellation
First Claim
1. A method for noise cancellation for an apparatus using an actuator including a predetermined desired phase shift and a predetermined desired amplitude, the method comprising the steps of:
- generating a first signal representing a movement of the apparatus;
generating a second signal based on (a) the first signal, (b) the predetermined desired phase shift, and (c) the predetermined desired amplitude; and
driving the actuator with the second signal,wherein the predetermined desired phase shift and the predetermined desired amplitude are set prior to generating the first signal.
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Accused Products
Abstract
The invention is directed to a system and method for noise cancellation for an apparatus such as an electric motors or generator. The system may comprise a plurality of actuators, a plurality of phase controllers, each phase controller receiving an input signal representing a movement of an apparatus and outputting an output signal based on the input signal and at least one predetermined phase shift, and a plurality of amplifiers, each amplifier receiving an output signal from one of the phase controllers and outputting an amplified signal to drive one of the actuators. The method may comprise the steps of generating a first signal representing a movement of the apparatus, generating at least one second signal based on (a) the first signal, (b) at least one predetermined phase shift, and (c) at least one predetermined amplitude, and driving at least one actuator with the at least one second signal.
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Citations
21 Claims
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1. A method for noise cancellation for an apparatus using an actuator including a predetermined desired phase shift and a predetermined desired amplitude, the method comprising the steps of:
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generating a first signal representing a movement of the apparatus; generating a second signal based on (a) the first signal, (b) the predetermined desired phase shift, and (c) the predetermined desired amplitude; and driving the actuator with the second signal, wherein the predetermined desired phase shift and the predetermined desired amplitude are set prior to generating the first signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for noise cancellation for an apparatus, the method comprising the steps of:
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positioning at least one actuator at a location fixed with respect to the apparatus based on a noise distribution of the apparatus; providing a phase controller for each of the at least one actuator, wherein the phase controller receives an input signal representing movement of the apparatus in operation, and the phase controller outputs an output signal based on the input signal and having a phase based on a predetermined desired phase shift; and actuating the actuator based on the output signal from the phase controller, wherein the predetermined desired phase shift is set prior to positioning the at least one actuator. - View Dependent Claims (16, 17)
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18. A noise cancellation method comprising the steps of:
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measuring an intensity of noise generated by an apparatus in operation; positioning a plurality of actuators with respect to the apparatus based on the measurement of noise intensity; determining a plurality of respective phase shifts for each of the plurality of actuators; determining a plurality of respective amplitudes for each of the plurality of actuators;
then generating a first signal which represents a movement of the apparatus in operation;generating a plurality of second signals based on the first signal, the respective phase shifts, and the respective amplitudes; and driving the plurality of actuators based on the plurality of second signals.
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19. A noise cancellation system comprising:
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a plurality of actuators; a plurality of phase controllers, each phase controller configured for receiving an input signal representing a movement of an apparatus and outputting an output signal based on the input signal and at least one predetermined desired phase shift that is set prior to receipt of the input signal; and a plurality of amplifiers, each amplifier for receiving an output signal from one of the phase controllers and outputting an amplified signal to drive one of the actuators. - View Dependent Claims (20, 21)
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Specification