| 摘要 |
A noise cancellation helmet includes a noise detecting means which detects noise in a helmet body, a sound outputting means which outputs a control sound for canceling the detected noise, a control signal generating means which processes an output signal of the noise detecting means through computation to generate a control signal for the control sound and applies the control signal to the soundoutputtingmeans, anutterance detecting means which detects utterance of a wearer, an utterance absent period gain adjusting means which adjusts a gain of the control signal generating means in an utterance absent period, an utterance absent period gain storing means which stores a gain set by the utterance absent period gain adjusting means immediately before the detection of the utterance, and an utterance present period gain adjusting means which adjusts the gain of the control signal generating means on the basis of the gain stored in the utterance absent period gain storing means in an utterance present period.
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