Active noise cancellation helmet, motor vehicle system including the active noise cancellation helmet, and method of canceling noise in helmet
First Claim
1. An active noise cancellation helmet comprising:
- a detection unit that is arranged to detect noise in a helmet body;
a sound outputting unit that is arranged to output a sound for canceling the noise detected by the detection unit;
a signal generating unit that is arranged to process an output signal of the detection unit through computation to generate a control signal;
an amplification unit that is arranged to amplify the control signal generated by the signal generating unit and to apply the amplified control signal to the sound outputting unit;
a sound pressure ratio acquiring unit that is arranged to acquire a ratio of sound pressures in different frequency ranges on the basis of the output signal of the detection unit; and
an adjustment unit that is arranged to adjust a gain of the amplification unit on the basis of the sound pressure ratio acquired by the sound pressure ratio acquiring unit so as to approximate a spectrum of the output signal of the detection unit to a predetermined target spectrum.
1 Assignment
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Accused Products
Abstract
An active noise cancellation helmet includes a detection unit which detects noise in a helmet body, and a sound outputting unit which outputs a sound for canceling the noise detected by the detection unit. A control signal is generated by processing an output signal of the detection unit through computation. The control signal is amplified by an amplification unit, and applied to the sound outputting unit. A ratio of sound pressures in different frequency ranges is determined on the basis of the output signal of the detection unit. A gain of the amplification unit is adjusted on the basis of the sound pressure ratio so as to approximate a spectrum of the output signal of the detection unit to a predetermined target spectrum.
123 Citations
23 Claims
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1. An active noise cancellation helmet comprising:
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a detection unit that is arranged to detect noise in a helmet body;
a sound outputting unit that is arranged to output a sound for canceling the noise detected by the detection unit;
a signal generating unit that is arranged to process an output signal of the detection unit through computation to generate a control signal;
an amplification unit that is arranged to amplify the control signal generated by the signal generating unit and to apply the amplified control signal to the sound outputting unit;
a sound pressure ratio acquiring unit that is arranged to acquire a ratio of sound pressures in different frequency ranges on the basis of the output signal of the detection unit; and
an adjustment unit that is arranged to adjust a gain of the amplification unit on the basis of the sound pressure ratio acquired by the sound pressure ratio acquiring unit so as to approximate a spectrum of the output signal of the detection unit to a predetermined target spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A motor vehicle system comprising:
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a vehicle body; and
an active noise cancellation helmet including a detection unit that is arranged to detect noise in a helmet body, a sound outputting unit that is arranged to output a sound for canceling the noise detected by the detection unit, a signal generating unit that is arranged to process an output signal of the detection unit through computation to generate a control signal, an amplification unit that is arranged to amplify the control signal generated by the signal generating unit and applies the amplified control signal to the sound outputting unit, a sound pressure ratio acquiring unit that is arranged to acquire a ratio of sound pressures in different frequency ranges on the basis of the output signal of the detection unit, and an adjustment unit that is arranged to adjust a gain of the amplification unit on the basis of the sound pressure ratio acquired by the sound pressure ratio acquiring unit so as to approximate a spectrum of the output signal of the detection unit to a predetermined target spectrum;
whereinat least the detection unit and the sound outputting unit are mounted in the helmet body of the active noise cancellation helmet; and
some of the components of the active noise cancellation helmet other than the detection unit and the sound outputting unit constitute a vehicle-side device provided in the vehicle body;
the motor vehicle system further comprising a communication unit that is arranged to transmit a signal between the vehicle-side device and the detection unit and between the vehicle-side device and the sound outputting unit.
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18. A motor vehicle system comprising:
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a vehicle body;
an active noise cancellation helmet;
an audible information generating unit provided in the vehicle body and arranged to generate audible information;
a transmission unit that is arranged to transmit the audible information generated by the audible information generating unit to a helmet body of the active noise cancellation helmet; and
an audible information outputting unit provided in the helmet body and arranged to output the audible information transmitted by the transmission unit, the active noise cancellation helmet including;
a detection unit that is arranged to detect noise in the helmet body;
a sound outputting unit that is arranged to output a sound for canceling the noise detected by the detection unit;
a signal generating unit that is arranged to process an output signal of the detection unit through computation to generate a control signal;
an amplification unit that is arranged to amplify the control signal generated by the signal generating unit and applies the amplified control signal to the sound outputting unit;
a sound pressure ratio acquiring unit that is arranged to acquire a ratio of sound pressures in different frequency ranges on the basis of the output signal of the detection unit; and
an adjustment unit that is arranged to adjust a gain of the amplification unit on the basis of the sound pressure ratio acquired by the sound pressure ratio acquiring unit so as to approximate a spectrum of the output signal of the detection unit to a predetermined target spectrum. - View Dependent Claims (19, 20, 21)
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22. A method of canceling noise in a helmet comprising the steps of:
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detecting noise in a helmet body by a detection unit;
outputting a sound from a sound outputting unit for canceling the detected noise;
processing an output signal of the detection unit through computation to generate a control signal;
amplifying the generated control signal by an amplification unit and applying the amplified control signal to the sound outputting unit;
acquiring a ratio of sound pressures in different frequency ranges on the basis of the output signal of the detection unit; and
adjusting a gain of the amplification unit on the basis of the acquired sound pressure ratio so that a spectrum of the output signal of the detection unit is approximated to a predetermined target spectrum. - View Dependent Claims (23)
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Specification