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US 9,426,595 B2Granted
Signal processing apparatus, signal processing method, and storage medium
AssigneeSony Corporation
InventorKenji Nakano
Life of this patent
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Abstract
A signal processing apparatus includes a low-pass-filter processing unit configured to perform processing for limiting a band of an input audio signal on the basis of a cutoff frequency; a high-pass-filter processing unit configured to perform processing for limiting a band of the input audio signal on the basis of the cutoff frequency; a delay processing unit configured to perform processing for delaying the audio signal band-limited by the high-pass-filter processing unit; and a combination processing unit configured to combine the audio signal band-limited by the low-pass-filter processing unit and the audio signal subjected to the delay processing performed by the delay processing unit.
Claims18
A signal processing apparatus, comprising:
- a low-pass-filter processing unit configured to perform processing for limiting a low-frequency audio band of an input audio signal below a reference frequency that lies between the low-frequency audio band and a high-frequency audio band, wherein the reference frequency is set dynamically in real time by the signal processing apparatus responsive to movement of a listener and is based on a position of the listener and corresponds to a frequency at which a characteristic fluctuation appears in frequency characteristics with respect to combined sound at positions of ears of the listener who listens to sound output from speakers and being set for the low-pass-filter processing unit;
- a high-pass-filter processing unit configured to perform processing for limiting the high-frequency audio band of the input audio signal above the reference frequency, wherein the reference frequency for the band-limited audio signal of the high-pass-filter processing unit is the same as the reference frequency for the band-limited audio signal of the low-pass-filter processing unit;
- a delay processing unit configured to perform processing for delaying the audio signal band-limited by the high-pass-filter processing unit for a selected time after the audio signal band-limited by the low-pass-filter processing unit;
- and
- a combination processing unit configured to combine the audio signal band-limited by the low-pass-filter processing unit and the audio signal subjected to the delay processing performed by the delay processing unit,
- wherein the signal processing apparatus is configured to detect and analyze positions of the listener in real time while the listener uses the signal processing apparatus.
3 more elements
A signal processing method for an audio system, comprising the steps of:
- performing low-pass-filter processing for limiting a low-frequency audio band of an input audio signal below a reference frequency that lies between the low-frequency audio band and a high-frequency audio band, wherein the reference frequency corresponds to a frequency at which a characteristic fluctuation appears in frequency characteristics with respect to combined sound at positions of ears of a listener who listens to sound output from speakers;
- performing high-pass-filter processing for limiting the high-frequency audio band of the input audio signal above the reference frequency, wherein the reference frequency for the band-limited audio signal of the high-pass-filter processing is the same as the reference frequency for the band-limited audio signal of the low-pass-filter processing;
- performing delay processing for delaying the audio signal band-limited in the high-pass-filter processing step for a selected time after the audio signal band-limited in the low-pass-filter processing step;
- detecting positions of the listener in real time while the listener uses the audio system;
- setting the reference frequency dynamically in real time responsive to real-time movement of the listener and based at least upon the detected positions of the listener;
- and
- performing combination processing for combining the audio signal band-limited in the low-pass-filter processing step and the audio signal subjected to the delay processing in the delay processing step.
4 more elements
A non-transitory storage medium that stores a program for a signal processing apparatus that performs signal processing on an input audio signal, the program causing the signal processing apparatus to execute:
- performing low-pass-filter processing for limiting a low-frequency audio band of an input audio signal below a reference frequency that lies between the low-frequency audio band and a high-frequency audio band, wherein, the reference frequency corresponds to a frequency at which a characteristic fluctuation appears in frequency characteristics with respect to combined sound at positions of ears of a listener who listens to sound output from speakers;
- performing high-pass-filter processing for limiting the high-frequency audio band of the input audio signal above the reference frequency, wherein the reference frequency for the band-limited audio signal of the high-pass-filter processing is the same as the reference frequency for the band-limited audio signal of the low-pass-filter processing;
- performing delay processing for delaying the audio signal band-limited by the high-pass-filter processing for a selected time after the audio signal band-limited by the low-pass-filter processing;
- setting the reference frequency in real time responsive to real-time movement of the listener based at least upon detected positions of the listener that are obtained and analyzed in real time while the listener uses the signal processing apparatus;
- and
- performing combination processing for combining the audio signal band-limited by the low-pass-filter processing and the audio signal subjected to the delay processing.
3 more elements
Dependencies are inferred from the claim text.