Noise reduction device
First Claim
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1. A noise reduction device comprising:
- a noise controller unit for generating a control sound signal to cancel out a noise;
a control sound output unit for outputting a control sound according to the control sound signal from the noise controller unit;
a residual sound detector for detecting a residual sound by superimposing the control sound on the noise; and
an obstacle detector for detecting an obstacle having potential for influencing detecting performance of the residual sound detector,wherein the noise controller unit generates the control sound signal according to data from the residual sound detector and the obstacle detector, andwherein the noise controller unit comprises;
a control filter unit for outputting a control signal by using a fixed filter coefficient set in advance;
a signal storage unit for storing a residual sound signal detected by the residual sound detector;
a filter coefficient calculation unit for calculating a filter coefficient by using the residual sound signal stored in the signal storage unit; and
a filter coefficient updating unit for updating the fixed filter coefficient set in the control filter unit to the filter coefficient calculated by the filter coefficient calculation unit at a predetermined timing.
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Abstract
A noise reduction device of the present invention comprises a control filter unit for generating a control sound signal to cancel out a noise, a control speaker for outputting a control sound according to the control sound signal from the control filter unit, an error microphone for detecting a residual sound by superimposing the noise upon the control sound output from the control speaker, and an obstacle detector for detecting an obstacle around the error microphone, wherein the control filter unit generates the control sound signal according to data from the error microphone and the obstacle detector.
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Citations
9 Claims
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1. A noise reduction device comprising:
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a noise controller unit for generating a control sound signal to cancel out a noise; a control sound output unit for outputting a control sound according to the control sound signal from the noise controller unit; a residual sound detector for detecting a residual sound by superimposing the control sound on the noise; and an obstacle detector for detecting an obstacle having potential for influencing detecting performance of the residual sound detector, wherein the noise controller unit generates the control sound signal according to data from the residual sound detector and the obstacle detector, and wherein the noise controller unit comprises; a control filter unit for outputting a control signal by using a fixed filter coefficient set in advance; a signal storage unit for storing a residual sound signal detected by the residual sound detector; a filter coefficient calculation unit for calculating a filter coefficient by using the residual sound signal stored in the signal storage unit; and a filter coefficient updating unit for updating the fixed filter coefficient set in the control filter unit to the filter coefficient calculated by the filter coefficient calculation unit at a predetermined timing. - View Dependent Claims (2, 3, 4, 6)
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5. A noise reduction device comprising:
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a noise detector for detecting a noise supplied from at least one noise source; a noise controller unit for generating a control sound signal to cancel out the noise detected by the noise detector; a control sound output unit for outputting a control sound according to the control sound signal from the noise controller unit; a residual sound detector for detecting a residual sound by superimposing the control sound on the noise supplied from the noise source; and an obstacle detector for detecting an obstacle having potential for influencing detecting performance of at least one of the noise detector and the residual sound detector, wherein the noise controller unit generates the control sound signal according to data from the noise detector, the residual sound detector and the obstacle detector, and wherein the noise controller unit comprises; a control filter unit for outputting a control signal by using a fixed filter coefficient set in advance; a signal storage unit for storing a noise signal detected by the noise detector and a residual sound signal detected by the residual sound detector; a filter coefficient calculation unit for calculating a filter coefficient by using the noise signal and the residual sound signal stored in the signal storage unit; and a filter coefficient updating unit for updating the fixed filter coefficient set in the control filter unit to the filter coefficient calculated by the filter coefficient calculation unit at a predetermined timing.
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7. A noise reduction device comprising:
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a noise detector for detecting a noise supplied from at least one noise source; a noise controller unit for generating a control sound signal to cancel out the noise detected by the noise detector; a control sound output unit for outputting a control sound according to the control sound signal from the noise controller unit; a residual sound detector for detecting a residual sound by superimposing the control sound on the noise supplied from the noise source; and an obstacle detector for detecting an obstacle having potential for influencing detecting performance of at least one of the noise detector and the residual sound detector, wherein the noise controller unit generates the control sound signal according to data from the noise detector, the residual sound detector and the obstacle detector, wherein the noise controller unit comprises; a control filter unit for outputting a control signal by using a fixed filter coefficient set in advance; a signal storage unit for storing a noise signal detected by the noise detector and a residual sound signal detected by the residual sound detector; a filter coefficient calculation unit for calculating a filter coefficient by using the noise signal and the residual sound signal stored in the signal storage unit; a filter coefficient storage unit for storing the filter coefficient calculated by the filter coefficient calculation unit; and a filter coefficient updating unit for updating the fixed filter coefficient set in the control filter unit to one of the filter coefficient calculated by the filter coefficient calculation unit and the filter coefficient stored in the filter coefficient storage unit at a predetermined timing. - View Dependent Claims (8, 9)
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Specification