NOISE CANCELLATION HELMET, MOTOR VEHICLE SYSTEM INCLUDING THE NOISE CANCELLATION HELMET, AND METHOD OF CANCELING NOISE IN HELMET
First Claim
1. A noise cancellation helmet comprising:
- a noise detecting unit that is arranged to detect noise in a helmet body;
a sound outputting unit that is arranged to output a control sound to cancel the noise detected by the noise detecting unit;
a control signal generating unit that is arranged to process an output signal of the noise detecting unit to generate a control signal for the control sound and apply the control signal to the sound outputting unit;
an utterance detecting unit that is arranged to detect an utterance of a wearer who wears the helmet body;
an utterance absent period gain adjusting unit that is arranged to adjust a gain of the control signal generating unit in an utterance absent period during which no utterance is detected by the utterance detecting unit;
an utterance absent period gain storing unit that is arranged to store a gain set by the utterance absent period gain adjusting unit immediately before the utterance is detected by the utterance detecting unit; and
an utterance present period gain adjusting unit that is arranged to adjust the gain of the control signal generating unit on the basis of the gain stored in the utterance absent period gain storing unit in an utterance present period during which the utterance is detected by the utterance detecting unit.
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Accused Products
Abstract
A noise cancellation helmet includes a noise detecting unit which detects noise in a helmet body, a sound outputting unit which outputs a control sound for canceling the detected noise, a control signal generating unit which processes an output signal of the noise detecting unit through computation to generate a control signal for the control sound and applies the control signal to the sound outputting unit, an utterance detecting unit which detects utterance of a wearer, an utterance absent period gain adjusting unit which adjusts a gain of the control signal generating unit in an utterance absent period, an utterance absent period gain storing unit which stores a gain set by the utterance absent period gain adjusting unit immediately before the detection of the utterance, and an utterance present period gain adjusting unit which adjusts the gain of the control signal generating unit on the basis of the gain stored in the utterance absent period gain storing unit in an utterance present period.
123 Citations
17 Claims
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1. A noise cancellation helmet comprising:
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a noise detecting unit that is arranged to detect noise in a helmet body;
a sound outputting unit that is arranged to output a control sound to cancel the noise detected by the noise detecting unit;
a control signal generating unit that is arranged to process an output signal of the noise detecting unit to generate a control signal for the control sound and apply the control signal to the sound outputting unit;
an utterance detecting unit that is arranged to detect an utterance of a wearer who wears the helmet body;
an utterance absent period gain adjusting unit that is arranged to adjust a gain of the control signal generating unit in an utterance absent period during which no utterance is detected by the utterance detecting unit;
an utterance absent period gain storing unit that is arranged to store a gain set by the utterance absent period gain adjusting unit immediately before the utterance is detected by the utterance detecting unit; and
an utterance present period gain adjusting unit that is arranged to adjust the gain of the control signal generating unit on the basis of the gain stored in the utterance absent period gain storing unit in an utterance present period during which the utterance is detected by the utterance detecting unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A noise cancellation helmet comprising:
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a noise detecting unit that is arranged to detect noise in a helmet body;
a sound outputting unit that is arranged to output a control sound to cancel the noise detected by the noise detecting unit;
a control signal generating unit that is arranged to process an output signal of the noise detecting unit to generate a control signal for the control sound and apply the control signal to the sound outputting unit;
first and second voice detecting units that are arranged to detect voice of a wearer of the helmet body at different positions within the helmet body and output voice signals;
an utterance detecting unit including a correlation computing unit that is arranged to compute a correlation value indicating a correlation between the voice signals respectively output from the first and second voice detecting units, and an utterance judging unit that is arranged to judge whether or not the wearer of the helmet body is making an utterance on the basis of the correlation value computed by the correlation computing unit;
an utterance absent period gain adjusting unit that is arranged to adjust a gain of the control signal generating unit in an utterance absent period during which no utterance is detected by the utterance detecting unit; and
an utterance present period gain adjusting unit that is arranged to adjust the gain of the control signal generating unit through a process different from that performed by the utterance absent period gain adjusting unit in an utterance present period during which the utterance is detected by the utterance detecting unit. - View Dependent Claims (14, 15)
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16. A method of canceling noise in a helmet comprising the steps of:
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detecting noise in a helmet body by a noise detecting unit;
outputting a control sound from a sound outputting unit to cancel the detected noise;
processing an output signal of the noise detecting unit 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;
detecting an utterance of a wearer who wears the helmet body;
adjusting a gain of the amplification unit in an utterance absent period during which the utterance of the wearer is not detected; and
adjusting the gain of the amplification unit on the basis of a gain set in the immediately preceding utterance absent period gain adjusting step in an utterance present period during which the utterance of the wearer is detected.
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17. A method of canceling noise in a helmet comprising the steps of:
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detecting noise in a helmet body by a noise detecting unit;
outputting a control sound from a sound outputting unit to cancel the detected noise;
processing an output signal of the noise detecting unit 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;
detecting voice of a wearer of the helmet body at different positions within the helmet body by first and second voice detecting units;
computing a correlation value indicating a correlation between voice signals respectively output from the first and second voice detecting units;
judging whether or not the wearer of the helmet body is making an utterance on the basis of the calculated correlation value;
adjusting a gain of the amplification unit in an utterance absent period during which it is judged that the wearer is not making an utterance; and
adjusting the gain of the amplification unit through a process different from that performed in the utterance absent period gain adjusting step in an utterance present period during which it is judged that the wearer is making an utterance.
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Specification