NOISE-REDUCTION DEVICE
First Claim
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1. A noise-reduction device for reducing noise in room interior of a movable body, comprising:
- a noise cancelling unit for acoustically outputting sound having a phase opposite to that of a main component of the noise to the room interior of the movable body so as to cancel the noise;
a specific sound determination unit for determining whether or not predetermined specific sound has been emitted outside the movable body; and
a control unit for reducing a noise cancelling amount in said noise cancelling unit in a case where it is determined in said specific sound determination unit that the specific sound has been emitted,wherein said specific sound determination unit includes on the movable body an external microphone that detects exterior sound of the movable body, andwherein said control unit controls said noise cancelling amount at said noise cancelling unit in conformity with a sound level detected by said external microphone.
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Abstract
When cancelling noise by acoustically outputting, to a room interior, sound having a phase opposite to that of noise leaked into the room interior of a movable body, if detected movable body exterior sound is predetermined specific sound, a cancelling amount of a noise cancelling operation is automatically reduced.
73 Citations
21 Claims
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1. A noise-reduction device for reducing noise in room interior of a movable body, comprising:
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a noise cancelling unit for acoustically outputting sound having a phase opposite to that of a main component of the noise to the room interior of the movable body so as to cancel the noise; a specific sound determination unit for determining whether or not predetermined specific sound has been emitted outside the movable body; and a control unit for reducing a noise cancelling amount in said noise cancelling unit in a case where it is determined in said specific sound determination unit that the specific sound has been emitted, wherein said specific sound determination unit includes on the movable body an external microphone that detects exterior sound of the movable body, and wherein said control unit controls said noise cancelling amount at said noise cancelling unit in conformity with a sound level detected by said external microphone. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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2. (canceled)
Specification