Signal processing apparatus and signal processing method
First Claim
1. A signal processing apparatus for processing a plurality of received signals obtained by receiving a signal or signals from a signal source or a plurality of signal sources through a plurality of reception apparatus, comprising:
- first means for decomposing each of the received signals into a plurality of different frequency band signals;
second means for calculating cross correlation functions between the different frequency band signals originating from two different ones of said reception apparatus for individual corresponding frequency bands for individual possible combinations of said reception apparatus; and
third means for estimating the direction or directions or the position or positions of the signal source or sources based on the cross correlation functions.
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Accused Products
Abstract
The invention provides a method and apparatus by which the direction in or the position at which a signal source such as a sound source is present is estimated. A signal or signals from a signal source or a plurality of signal sources are received by a plurality of reception apparatus, and the received signals are decomposed into signals of different frequency bands by a plurality of band-pass filters. Then, cross correlation functions between the different frequency band signals are calculated for individual combinations of the reception apparatus for the individual corresponding frequency bands. If the power of noise having no directivity is high in some of the frequency bands, then the cross correlation functions of the frequency band do not exhibit a maximum value. Therefore, an influence of the noise can be suppressed effectively when delay times of the individual reception apparatus which depend upon the direction or directions or the position or positions of the signal source or sources are estimated.
78 Citations
32 Claims
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1. A signal processing apparatus for processing a plurality of received signals obtained by receiving a signal or signals from a signal source or a plurality of signal sources through a plurality of reception apparatus, comprising:
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first means for decomposing each of the received signals into a plurality of different frequency band signals;
second means for calculating cross correlation functions between the different frequency band signals originating from two different ones of said reception apparatus for individual corresponding frequency bands for individual possible combinations of said reception apparatus; and
third means for estimating the direction or directions or the position or positions of the signal source or sources based on the cross correlation functions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A signal processing apparatus for processing a signal played back from a recording medium on which a signal or signals received from a signal source or a plurality of signal sources through a plurality of reception apparatus are recorded, comprising:
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first means for decomposing each of the played back received signals into a plurality of different frequency band signals;
second means for calculating cross correlation functions between the different frequency band signals originating from two different ones of said reception apparatus for individual corresponding frequency bands for individual possible combinations of said reception apparatus; and
third means for estimating the direction or directions or the position or positions of the signal source or sources based on the cross correlation functions.
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9. A signal processing apparatus for processing a plurality of received signals obtained by receiving a signal or signals from a signal source or a plurality of signal sources through a plurality of reception apparatus, comprising:
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first means for decomposing each of the received signals into a plurality of different frequency band signals;
second means for calculating cross correlation functions between the different frequency band signals originating from two different ones of said reception apparatus for individual corresponding frequency bands for individual possible combinations of said reception apparatus;
third means for estimating delay times of individual ones of said reception apparatus which depend upon the direction or directions or the position or positions of the signal source or sources and an arrangement of said reception apparatus based on cross correlation functions; and
fourth means for delaying the different frequency band signals of the received signals individually using the estimated delay times and adding the delayed different frequency band signals. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 19, 20, 21, 22, 23, 26, 27, 28, 29, 30, 31)
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17. A signal processing apparatus for processing a signal played back from a recording medium on which a signal or signals received from a signal source or a plurality of signal sources through a plurality of reception apparatus are recorded, comprising:
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first means for decomposing each of the played back received signals into a plurality of different frequency band signals;
second means for calculating cross correlation functions between the different frequency band signals originating from two different ones of said reception apparatus for individual corresponding frequency bands for individual possible combinations of said reception apparatus;
third means for estimating delay times of individual ones of said reception apparatus which depend upon the direction or directions or the position or positions of the signal source or sources and an arrangement of said reception apparatus based on cross correlation functions; and
fourth means for delaying the different frequency band signals of the received signals individually using the estimated delay times and adding the delayed different frequency band signals.
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18. A signal processing method for processing a plurality of received signals obtained by receiving a signal or signals from a signal source or a plurality of signal sources through a plurality of reception apparatus, comprising:
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a first step of decomposing each of the received signals into a plurality of different frequency band signals;
a second step of calculating cross correlation functions between the different frequency band signals originating from two different ones of said reception apparatus for individual corresponding frequency bands for individual possible combinations of said reception apparatus; and
a third step of estimating the direction or directions or the position or positions of the signal source or sources based on the cross correlation functions.
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24. A signal processing method for processing a signal played back from a recording medium on which a signal or signals received from a signal source or a plurality of signal sources through a plurality of reception apparatus are recorded, comprising:
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a first step of decomposing each of the played back received signals into a plurality of different frequency band signals;
a second step of calculating cross correlation functions between the different frequency band signals originating from two different ones of said reception apparatus for individual corresponding frequency bands for individual possible combinations of said reception apparatus; and
a third step of estimating the direction or directions or the position or positions of the signal source or sources based on the cross correlation functions.
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25. A signal processing method for processing a plurality of received signals obtained by receiving a signal or signals from a signal source or a plurality of signal sources through a plurality of reception apparatus, comprising:
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a first step of decomposing each of the received signals into a plurality of different frequency band signals;
a second step of calculating cross correlation functions between the different frequency band signals originating from two different ones of said reception apparatus for individual corresponding frequency bands for individual possible combinations of said reception apparatus;
a third step of estimating delay times of individual ones of said reception apparatus which depend upon the direction or directions or the position or positions of the signal source or sources and an arrangement of said reception apparatus based on cross correlation functions; and
a fourth step of delaying the different frequency band signals of the received signals individually using the estimated delay times and adding the delayed different frequency band signals.
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32. A signal processing method for processing a signal played back from a recording medium on which a signal or signals received from a signal source or a plurality of signal sources through a plurality of reception apparatus are recorded, comprising:
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a first step of decomposing each of the played back received signals into a plurality of different frequency band signals;
a second step of calculating cross correlation functions between the different frequency band signals originating from two different ones of said reception apparatus for individual corresponding frequency bands for individual possible combinations of said reception apparatus;
a third step of estimating delay times of individual ones of said reception apparatus which depend upon the direction or directions or the position or positions of the signal source or sources and an arrangement of said reception apparatus based on cross correlation functions; and
a fourth step of delaying the different frequency band signals of the received signals individually using the estimated delay times and adding the delayed different frequency band signals.
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Specification