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US 9,871,497 B2Granted
Processing audio signal to produce enhanced audio signal
AssigneeSony Corporation
InventorsKohei Asada, Shinpei Tsuchiya, Kazunobu Ookuri, Yushi Yamabe
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Abstract
A signal processing apparatus includes a transform unit configured to orthogonally transform an audio signal; an analysis unit configured to analyze the audio signal orthogonally transformed by the transform unit and estimate a very high frequency stationary signal component; and a signal processing unit configured to perform signal processing to reduce the very high frequency stationary signal component estimated by the analysis of the analysis unit with respect to the audio signal.
Claims19
A signal processing apparatus, comprising:
- a central processing unit (CPU) configured to:
- band-divide an audio signal into a first signal component and a second signal component, wherein the first signal component comprises a first frequency greater than or equal to a first threshold and wherein the second signal component comprises a second frequency less than the first threshold;
- orthogonally transform the first signal component;
- analyze the orthogonally transformed first signal component;
- estimate, based on the analysis of the orthogonally transformed first signal component, a stationary signal component of the first signal component, wherein the stationary signal component has a third frequency greater than the first threshold;
- reduce the estimated stationary signal component based on the first signal component;
- synthesize the reduced estimated stationary signal component and the second signal component to produce an enhanced audio signal;
- and
- output the enhanced audio signal through an audio output device.
6 more elements
A signal processing method, comprising:
- band-dividing an audio signal into a first signal component and a second signal component, wherein the first signal component comprises a first frequency greater than or equal to a first threshold and wherein the second signal component comprises a second frequency less than the first threshold;
- orthogonally transforming the first signal component;
- analyzing the orthogonally transformed first signal component;
- estimating, based on the analysis of the orthogonally transformed first signal component, a stationary signal component of the first signal component, wherein the stationary signal component has a third frequency greater than the first threshold;
- reducing the estimated stationary signal component based on the first signal component;
- synthesizing the reduced estimated stationary signal component and the second signal component to produce an enhanced audio signal;
- and
- outputting the enhanced audio signal.
5 more elements
A signal processing apparatus, comprising:
- a central processing unit (CPU) configured to:
- orthogonally transform an audio signal;
- analyze the orthogonally transformed audio signal,
- estimate, based on the analysis, a stationary signal component of the audio signal that has a frequency greater than a threshold;
- reduce the estimated stationary signal component in the audio signal based on a low-pass filter, wherein a cut-off frequency of the low-pass filter is based on an amplification amount of the audio signal, to produce an enhanced audio signal;
- and
- output the enhanced audio signal through an audio output device.
4 more elements
A signal processing apparatus, comprising:
- a central processing unit (CPU) configured to:
- orthogonally transform an audio signal;
- analyze the orthogonally transformed audio signal;
- estimate, based on the analysis, a stationary signal component of the audio signal that has a frequency greater than a threshold;
- reduce the estimated stationary signal component based on a low-pass filter to produce an enhanced audio signal,
- wherein the low-pass filter has an inclination of a frequency characteristic in a band equal to or greater than a cut-off frequency, and
- wherein the inclination of the frequency characteristic is based on an amplification amount of the audio signal, and
- output the enhanced audio signal through an audio output device.
5 more elements
A signal processing apparatus, comprising:
- a central processing unit (CPU) configured to:
- orthogonally transform an audio signal;
- analyze the orthogonally transformed audio signal;
- estimate, based on the analysis, a stationary signal component of the audio signal that has a frequency greater than a threshold;
- reduce the estimated stationary signal component based on a treble shelving filter, wherein a gain of the treble shelving filter is based on an amplification amount of the audio signal, to produce an enhanced audio signal;
- and
- output the enhanced audio signal through an audio output device.
4 more elements
Dependencies are inferred from the claim text.