Noise suppression device, system, and method
First Claim
1. A noise-suppression assembly of a mechanical drive system having a rotational frequency, the mechanical drive system including a rotor of a helicopter, the assembly comprising:
- an audio filter unit configured to receive a first audio signal and a timing signal of the mechanical drive system, the audio filter unit configured to generate a noise-cancellation signal based on a frequency of the timing signal, said frequency based on the rotational frequency of the rotor, to suppress a noise generated by the mechanical drive system and to apply the noise-cancellation signal to the first audio signal to produce a filtered first audio signal, the frequency based on a signal obtained from at least one sensor located on the rotor, wherein the sensor is a proximity sensor configured to detect the position of the rotor relative to a fixed position.
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Abstract
A noise-suppression assembly of a mechanical drive system having a rotational frequency includes an audio filter unit configured to receive a first audio signal and a timing signal of the mechanical drive system. The audio filter unit generates a noise-cancellation signal based on a frequency of the timing signal to suppress a noise generated by the mechanical drive system and to apply the noise-cancellation signal to the first audio signal to produce a filtered first audio signal. The frequency of the timing signal is based on the rotational frequency of the mechanical drive system.
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Citations
20 Claims
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1. A noise-suppression assembly of a mechanical drive system having a rotational frequency, the mechanical drive system including a rotor of a helicopter, the assembly comprising:
an audio filter unit configured to receive a first audio signal and a timing signal of the mechanical drive system, the audio filter unit configured to generate a noise-cancellation signal based on a frequency of the timing signal, said frequency based on the rotational frequency of the rotor, to suppress a noise generated by the mechanical drive system and to apply the noise-cancellation signal to the first audio signal to produce a filtered first audio signal, the frequency based on a signal obtained from at least one sensor located on the rotor, wherein the sensor is a proximity sensor configured to detect the position of the rotor relative to a fixed position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A noise-suppression system, comprising:
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a mechanical drive system of a helicopter including a rotor and having a rotational frequency; at least one sensor located on the rotor, wherein the sensor is a proximity sensor configured to detect the position of the rotor relative to a fixed position; a timing signal generator to generate a timing signal that corresponds to the rotational frequency of the rotor based on a signal from the at least one sensor; and an audio system including an audio filter unit configured to receive a first audio signal and the timing signal, the audio filter unit configured to generate a noise-cancellation signal corresponding to the rotational frequency of the rotor based on the timing signal to suppress noise from the mechanical drive system and to apply the noise-cancellation signal to the first audio signal to produce a filtered first audio signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of suppressing noise in a mechanical drive system having a rotational frequency, the mechanical drive system including a rotor of a helicopter, the method comprising:
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receiving a first audio signal; receiving a timing signal based on the rotational frequency of the rotor from at least one sensor located on the rotor, wherein the sensor is a proximity sensor configured to detect the position of the rotor relative to a fixed position; determining a frequency of the timing signal; generating a noise-suppression signal based on the frequency of the timing signal; and applying the noise-suppression signal to the first audio signal to produce a filtered first audio signal wherein a noise generated by the mechanical drive system in the first audio signal is suppressed, wherein the noise-suppression signal is continuously applied to the first audio signal such that transients generated by starting and stopping of the application of the noise-suppression signal are avoided. - View Dependent Claims (17, 18, 19, 20)
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Specification