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US 2006/0269252 A1Published application
Signal processing circuit, method of processing signal, audio signal processing circuit, method of processing audio signal, imaging apparatus, method of processing audio signal with imaging apparatus, recording apparatus, method of recording, playing apparatus, and method of playing
AssigneeSony Corporation
InventorKazuhiko Ozawa
Life of this patent
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Abstract
A signal processing circuit includes a delaying unit that is configured to carry out delay processing on the basis of periodicity information synchronized with the periodicity of a periodic noise included in an input signal and a filter unit that is configured to receive the input signal and has a notch characteristic at a frequency f. The frequency f satisfies f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by the delaying unit.
Claims18
A signal processing circuit comprising:
- a delaying unit configured to carry out delay processing on the basis of periodicity information synchronized with the periodicity of a periodic noise included in an input signal;
- and
- a filter unit configured to receive the input signal, the filter unit having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by the delaying unit.
A method of processing a signal, comprising the steps of:
- filtering an input signal with a filter having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by delay processing performed on the basis of periodicity information synchronized with the periodicity of a periodic noise included in the input signal;
- and
- outputting the filtered signal.
A signal processing circuit comprising:
- a first filter including,
- a delaying unit configured to carry out delay processing on the basis of periodicity information synchronized with the periodicity of a periodic noise included in an input signal, and
- a filter unit configured to receive the input signal, the filter unit having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by the delaying unit;
- a second filter including,
- an adaptive filter unit configured to output a pseudo noise signal approximating the periodic noise on the basis of the periodicity information, and
- a subtraction unit configured to subtract the pseudo noise signal from the input signal;
- and
- a switching unit configured to switch between outputting a first output from the first filter and a second output from the second filter and to output either the first output or the second output.
5 more elements
A method of processing a signal comprising the steps of:
- switching between outputting a first output and a second output, the first output being obtained by filtering an input signal with a filter having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by delay processing performed on the basis of periodicity information synchronized with the periodicity of a periodic noise included in the input signal, the second output being obtained by subtracting a pseudo noise signal approximating the periodic noise from the input signal, the pseudo noise signal being obtained at an adaptive filter on the basis of the periodicity information;
- and
- outputting either the first output or the second output.
An audio signal processing circuit comprising:
- a delaying unit configured to carry out delay processing on the basis of periodicity information synchronized with the periodicity of a periodic noise included in an input audio signal;
- and
- a filter unit configured to receive the audio signal, the filter unit having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by the delaying unit.
A method of processing an audio signal comprising the steps of:
- filtering an input audio signal with a filter having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by delay processing performed on the basis of periodicity information synchronized with the periodicity of a periodic noise included in the audio signal;
- and
- outputting the filtered audio signal.
An audio signal processing circuit comprising:
- a first filter including,
- a delaying unit configured to carry out delay processing on the basis of periodicity information synchronized with the periodicity of a periodic noise included in an input audio signal, and
- a filter unit configured to receive the audio signal, the filter unit having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by the delaying unit;
- a second filter, including
- an adaptive filter unit configured to output a pseudo noise signal approximating the periodic noise on the basis of the periodicity information, and
- a subtraction unit configured to subtract the pseudo noise signal from the audio signal;
- and
- a switching unit configured to switch between outputting a first output of the first filter and a second output of the second filter and to output either the first output or the second output.
5 more elements
A method of processing an audio signal comprising the steps of:
- switching between outputting a first output and a second output, the first output being obtained by filtering an input audio signal with a filter having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by delay processing performed on the basis of periodicity information synchronized with the periodicity of a periodic noise included in the audio signal, the second output being obtained by subtracting a pseudo noise signal approximating the periodic noise from the audio signal, the pseudo noise signal being obtained at an adaptive filter on the basis of the periodicity information;
- and
- outputting either the first output or the second output.
An imaging apparatus comprising:
- an imaging unit configured to capture light from an object and to output an image signal;
- an audio pick-up unit configured to pick up sound and output an audio signal;
- an audio signal processing unit configured to carry out signal processing on an audio signal output from the audio pick-up unit;
- and
- a recording unit having a rotary mechanism, the recording unit being capable of recording an image signal output from the imaging unit and an audio signal output from the audio signal processing unit onto a recording medium,
- wherein the audio signal processing unit includes,
- a first filter having,
- a delaying unit configured to carry out delay processing on the basis of periodicity information synchronized with the periodicity of a periodic noise included in the audio signal, and
- a filter unit configured to receive the audio signal, the filter unit having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by the delaying unit;
- a second filter having,
- an adaptive filter unit configured to output a pseudo noise signal approximating the periodic noise on the basis of the periodicity information, and
- a subtraction unit configured to subtract the pseudo noise signal from the audio signal, and
- a switching unit configured to switch between outputting a first output from the first filter and a second output from the second filter and to output either the first output or the second output.
10 more elements
A method of processing an audio signal for an imaging apparatus, comprising the steps of:
- capturing light reflected from an object at an imaging unit and outputting an image signal;
- picking up sound at an audio pick-up unit and outputting an audio signal;
- carrying out signal processing on an audio signal output in the step of picking up sound;
- and
- recording an image signal output in the step of capturing light and an audio signal output in the step of carrying out signal processing onto a recording medium at a recording unit having a rotary mechanism,
- wherein the step of carrying out signal processing includes the steps of,
- switching between outputting a first output and a second output, the first output being obtained by filtering the audio signal with a filter having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by delay processing performed on the basis of periodicity information synchronized with the periodicity of a periodic noise included in the audio signal, the second output being obtained by subtracting a pseudo noise signal approximating the periodic noise from the audio signal, the pseudo noise signal being obtained at an adaptive filter on the basis of the periodicity information, and
- outputting either the first output or the second output.
5 more elements
A recording apparatus comprising:
- an audio pick-up unit configured to pick up sound and output an audio signal;
- an audio signal processing unit configured to carry out signal processing on an audio signal output from the audio pick-up unit;
- and
- a recording unit having a rotary mechanism, the recording unit being capable of recording an audio signal output from the audio signal processing unit,
- wherein the audio signal processing unit includes,
- a first filter having,
- a delaying unit configured to carry out delay processing on the basis of periodicity information synchronized with the periodicity of a periodic noise included in the audio signal, and
- a filter unit configured to receive the audio signal, the filter unit having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by the delaying unit, and
- a second filter having,
- an adaptive filter unit configured to output a pseudo noise signal approximating the periodic noise on the basis of the periodicity information, and
- a subtraction unit configured to subtract the pseudo noise signal from the audio signal, and
- a switching unit configured to switch between outputting a first output from the first filter and a second output from the second filter and to output either the first output or the second output.
9 more elements
A method of recording comprising the steps of:
- picking up sound and outputting an audio signal;
- carrying out signal processing on an audio signal output in the step of picking up sound;
- and
- recording an audio signal output in the step of carrying out signal processing onto a recording medium at a recording unit having a rotary mechanism,
- wherein the step of carrying out signal processing includes the steps of,
- switching between outputting a first output and a second output, the first output being obtained by filtering the audio signal with a filter having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by delay processing performed on the basis of periodicity information synchronized with the periodicity of a periodic noise included in the audio signal, the second output being obtained by subtracting a pseudo noise signal approximating the periodic noise from the audio signal, the pseudo noise signal being obtained at an adaptive filter on the basis of the periodicity information, and
- outputting either the first output or the second output.
4 more elements
A playing apparatus comprising:
- a playing unit configured to play an audio signal, the playing unit including a rotary mechanism;
- an audio signal processing unit configured to carry out signal processing on an audio signal output from the playing unit;
- and
- an audio output unit configured to output an audio signal output from the signal processing unit,
- wherein the audio signal processing unit includes,
- a first filter having,
- a delaying unit configured to carry out delay processing on the basis of periodicity information synchronized with the periodicity of a periodic noise included in the audio signal, and
- a filter unit configured to receive the audio signal, the filter unit having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by the delaying unit, and
- a second filter having,
- an adaptive filter unit configured to output a pseudo noise signal approximating the periodic noise on the basis of the periodicity information, and
- a subtraction unit configured to subtract the pseudo noise signal from the audio signal;
- and
- a switching unit configured to switch between outputting a first output from the first filter and a second output from the second filter and to output either the first output or the second output.
10 more elements
A method of playing comprising the steps of:
- playing an audio signal at a playing unit including a rotary mechanism;
- carrying out signal processing on an audio signal output in the step of playing an audio signal;
- and
- outputting an audio signal output in the step of carrying out signal processing,
- wherein the step of carrying out signal processing includes the steps of,
- switching between outputting a first output and a second output, the first output being obtained by filtering the audio signal with a filter having a notch characteristic at a frequency f, the frequency f satisfying f=N/T, where N represents an integer equal to or greater than one and T represents a delaying time applied by delay processing performed on the basis of periodicity information synchronized with the periodicity of a periodic noise included in the audio signal, the second output being obtained by subtracting a pseudo noise signal approximating the periodic noise from the audio signal, the pseudo noise signal being obtained at an adaptive filter on the basis of the periodicity information, and
- outputting either the first output or the second output.
4 more elements
Dependencies are inferred from the claim text.