Noise reduction audio reproducing device and noise reduction audio reproducing method
First Claim
1. A noise reduction audio reproducing device comprising:
- a noise cancel processing unit comprising at least one processor programmed to apply digital feedforward filtering to noise collected by a microphone to provide a filtered noise signal, wherein the noise cancel processing unit is arranged to output a noise cancellation audio signal based on the filtered noise signal;
a noise reduction processing unit configured to provide an emphasized audio signal by emphasizing an audio component in a first audio signal to be listened to;
a synthesizing unit arranged to synthesize an output audio signal based on the noise cancellation audio signal and said emphasized audio signal, and to supply said output audio signal to an electro-acoustic converting unit; and
a control unit configured to perform control so as to supply said emphasized audio signal to said synthesizing unit based on a control signal, wherein the control signal, when applied to activate a switch circuit coupled between the noise reduction processing unit and the synthesizing unit, enables the emphasized audio signal to be supplied from said noise reduction processing unit to the synthesizing unit.
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Abstract
A noise reduction audio reproducing method includes the steps of: generating, from an audio signal of collected and obtained noise, an audio signal for noise cancellation to cancel the noise by synthesizing the audio signal for noise cancellation and the noise in an acoustic manner, reproducing the audio signal for noise cancellation acoustically to synthesize this with the noise in an acoustic manner; emphasizing an audio component to be listened to, of collected audio; synthesizing an audio signal with the audio component to be listened to being emphasized, and the audio signal for noise cancellation to supply the synthesized signal thereof to an electro-acoustic converting unit; and controlling so as to supply an audio signal, with the audio component to be listened to having been emphasized, to a synthesizing unit, regarding only a section based on a control signal.
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Citations
13 Claims
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1. A noise reduction audio reproducing device comprising:
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a noise cancel processing unit comprising at least one processor programmed to apply digital feedforward filtering to noise collected by a microphone to provide a filtered noise signal, wherein the noise cancel processing unit is arranged to output a noise cancellation audio signal based on the filtered noise signal; a noise reduction processing unit configured to provide an emphasized audio signal by emphasizing an audio component in a first audio signal to be listened to; a synthesizing unit arranged to synthesize an output audio signal based on the noise cancellation audio signal and said emphasized audio signal, and to supply said output audio signal to an electro-acoustic converting unit; and a control unit configured to perform control so as to supply said emphasized audio signal to said synthesizing unit based on a control signal, wherein the control signal, when applied to activate a switch circuit coupled between the noise reduction processing unit and the synthesizing unit, enables the emphasized audio signal to be supplied from said noise reduction processing unit to the synthesizing unit. - View Dependent Claims (2, 4, 5, 6, 7)
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3. A noise reduction audio reproducing device comprising:
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a noise cancellation generating unit comprising at least one processor programmed to apply digital feedforward filtering to noise collected by a microphone to provide a filtered noise signal, wherein the noise cancellation generating unit is arranged to generate a noise cancellation audio signal based on the filtered noise signal; an electro-acoustic converting unit configured to reproduce said noise cancellation audio signal acoustically; a noise reduction processing unit configured to provide an emphasized audio signal by emphasizing an audio component in an input signal to be listened to; a synthesizing unit arranged to synthesize an output audio signal based on the noise cancellation audio signal and the emphasized audio signal, and to supply said output audio signal to said electro-acoustic converting unit; and a control unit configured to perform control so as to supply said emphasized audio signal to said synthesizing unit based on a control signal, wherein the control signal, when applied to activate a switch circuit coupled between the noise reduction processing unit and the synthesizing unit, enables the emphasized audio signal to be supplied from said noise reduction processing unit to the synthesizing unit. - View Dependent Claims (8, 9, 10, 11)
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12. A noise reduction audio reproducing method comprising steps of:
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generating a noise cancellation audio signal based on noise collected using a microphone, wherein generating the noise cancellation audio signal comprises applying digital feed-forward filtering to the noise collected using the microphone; emphasizing an audio component of an input audio signal to be listened to provide an emphasized audio signal; synthesizing, with a synthesizing unit, an output audio signal based on the noise cancellation audio signal and the emphasized audio signal; supplying the output audio signal to an electro-acoustic converting unit; and controlling when the emphasized audio signal is supplied to the synthesizing unit based on a control signal, wherein the control signal, when applied to activate a switch circuit coupled between the noise reduction processing unit and the synthesizing unit, enables the emphasized audio signal to be supplied to the synthesizing unit.
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13. A noise reduction audio reproducing method comprising:
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generating, from a collected and obtained audio signal of noise, a noise cancellation audio signal to cancel said noise in an input signal, wherein generating the noise cancellation audio signal comprises applying digital feed-forward filtering to the noise collected using the microphone; reproducing said noise cancellation audio signal for noise cancellation acoustically; emphasizing an audio component of the input signal to be listened to produce an emphasized audio signal; synthesizing, with a synthesizing unit, an output audio signal based on said noise cancellation audio signal and said emphasized audio signal; supplying said output audio signal to an electro-acoustic converting unit; and controlling when the emphasized audio signal is supplied to the synthesizing unit based on a control signal, wherein the control signal, when applied to activate a switch circuit coupled between the noise reduction processing unit and the synthesizing unit, enables the emphasized audio signal to be supplied to the synthesizing unit.
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Specification