Active noise reduction system, and vehicular active noise reduction system
First Claim
1. An active noise reduction system that actively reduces noise, the system comprising:
- a first sound collecting unit disposed in a first space in a closed space, that collects sound generated in the first space;
a second sound collecting unit disposed in a second space situated away from the first space in the closed space, that collects sound generated in the second space;
a first sound output unit that is disposed in the first space and outputs sound;
a second sound output unit that is disposed in the second space and outputs sound; and
an active noise reduction device that performs control to output a cancellation sound that reduces noise in the closed space, from at least one of the first sound output unit and the second sound output unit,the active noise reduction device including;
a first audio compositing unit that generates first composite audio generated by compositing audio signals of a first cancellation sound with audio collected by the second sound collecting unit, the first cancellation sound being generated by referencing the noise and audio collected by the first sound collecting unit, anda second audio compositing unit that generates second composite audio generated by compositing audio signals of a second cancellation sound with audio collected by the first sound collecting unit, the second cancellation sound being generated by referencing the noise and audio collected by the second sound collecting unit,wherein the active noise reduction deviceperforms control to output the first composite audio to the first sound output unit, while outputting the second composite audio to the second sound output unit, andat the time of generating the first and second composite audios, performs processing to remove audio components from each of the audio collected by the first sound collecting unit and the audio collected by the second sound collecting unit, the audio components belonging to a frequency band associated with noise that is to be reduced in the closed space.
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Abstract
A vehicular active noise reduction system includes a first microphone and first speaker disposed in a front-seat space, a second microphone and second speaker disposed in a back-seat space, and an active noise reduction device that performs control to output cancellation sound, to reduce noise in a cabin, from the first speaker and second speaker. When generating a first composite audio, the active noise reduction device removes audio components belonging to a frequency band relating to a second cancellation sound from audio collected by the first microphone, and when generating a second composite audio, removes audio components belonging to a frequency band relating to a first cancellation sound from audio collected by the second microphone.
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Citations
8 Claims
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1. An active noise reduction system that actively reduces noise, the system comprising:
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a first sound collecting unit disposed in a first space in a closed space, that collects sound generated in the first space; a second sound collecting unit disposed in a second space situated away from the first space in the closed space, that collects sound generated in the second space; a first sound output unit that is disposed in the first space and outputs sound; a second sound output unit that is disposed in the second space and outputs sound; and an active noise reduction device that performs control to output a cancellation sound that reduces noise in the closed space, from at least one of the first sound output unit and the second sound output unit, the active noise reduction device including; a first audio compositing unit that generates first composite audio generated by compositing audio signals of a first cancellation sound with audio collected by the second sound collecting unit, the first cancellation sound being generated by referencing the noise and audio collected by the first sound collecting unit, and a second audio compositing unit that generates second composite audio generated by compositing audio signals of a second cancellation sound with audio collected by the first sound collecting unit, the second cancellation sound being generated by referencing the noise and audio collected by the second sound collecting unit, wherein the active noise reduction device performs control to output the first composite audio to the first sound output unit, while outputting the second composite audio to the second sound output unit, and at the time of generating the first and second composite audios, performs processing to remove audio components from each of the audio collected by the first sound collecting unit and the audio collected by the second sound collecting unit, the audio components belonging to a frequency band associated with noise that is to be reduced in the closed space. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle active noise reduction system that actively reduces noise, the system comprising:
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a first sound collecting unit, disposed in a front-seat space in a cabin of a vehicle, that collects sound generated in the front-seat space; a second sound collecting unit, disposed in a back-seat space situated in the cabin, that collects sound generated in the back-seat space; a first sound output unit that is disposed in the front-seat space and outputs sound; a second sound output unit that is disposed in the back-seat space and outputs sound; and an active noise reduction device that performs control to output a cancellation sound that reduces noise in the cabin, from at least one of the first sound output unit and the second sound output unit, the active noise reduction device including a first audio compositing unit that generates first composite audio generated by compositing audio signals of a first cancellation sound with audio collected by the second sound collecting unit, the first cancellation sound being generated by referencing the noise and audio collected by the first sound collecting unit, and a second audio compositing unit that generates second composite audio generated by compositing audio signals of a second cancellation sound with audio collected by the first sound collecting unit, the second cancellation sound being generated by referencing the noise and audio collected by the second sound collecting unit, wherein the active noise reduction device performs control to output the first composite audio to the first sound output unit, while outputting the second composite audio to the second sound output unit, and at the time of generating the first and second composite audios, performs processing to remove audio components from each of the audio collected by the first sound collecting unit and the audio collected by the second sound collecting unit, the audio components belonging to a frequency band associated with noise that is to be reduced in the cabin.
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8. A vehicle active noise reduction apparatus that actively reduces noise, comprising:
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a first microphone, disposed in a front-seat space in a cabin of a vehicle, that collects sound generated in the front-seat space; a second microphone, disposed in a back-seat space situated in the cabin, that collects sound generated in the back-seat space; a first speaker that is disposed in the front-seat space and outputs sound; a second speaker that is disposed in the back-seat space and outputs sound; and an active noise reduction computer configured to perform control to output a cancellation sound that reduces noise in the cabin, from at least one of the first speaker and the second speaker, the active noise reduction computer is configured to perform; a first audio compositing unit that generates first composite audio generated by compositing audio signals of a first cancellation sound with audio collected by the second microphone, the first cancellation sound being generated by referencing the noise and audio collected by the first microphone, and a second audio compositing unit that generates second composite audio generated by compositing audio signals of a second cancellation sound with audio collected by the first microphone, the second cancellation sound being generated by referencing the noise and audio collected by the second microphone, wherein the active noise reduction computer is configured to; perform control to output the first composite audio to the first speaker, while outputting the second composite audio to the second speaker, and at the time of generating the first and second composite audios, perform processing to remove audio components from each of the audio collected by the first microphone and the audio collected by the second microphone, the audio components belonging to a frequency band associated with noise that is to be reduced in the cabin.
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Specification