SOUND ENHANCEMENT METHOD, DEVICE, PROGRAM AND RECORDING MEDIUM
First Claim
1. A sound enhancement method of obtaining a frequency-domain output signal in which a sound from a desired position determined by a direction and a distance is enhanced by applying, for each frequency, a filter enhancing a sound from the position to frequency-domain signals transformed from M picked-up sounds picked up with M microphones, where M is an integer greater than or equal to two, the method comprising:
- a filter design step of using a transmission characteristic ai,g of a sound that comes from each of one or a plurality of positions that are assumed to be sound sources and arrives at each of the microphones to obtain the filter for each frequency for a position that is a target of a sound enhancement, where i denotes a direction and g denotes a distance for identifying each of the positions; and
a filter applying step of applying the filter obtained at the filter design step to the frequency-domain signals for each frequency to obtain the output signal;
wherein each of the transfer functions ai,g is represented by the sum of a transmission characteristic of a direct sound that comes from the position determined by the direction i and the distance g and directly arrives at the M microphones and a transmission characteristic of one or more reflected sounds, the one or more reflected sounds being produced by reflection of the direct sound off an reflective object and arriving at the M microphones.
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Accused Products
Abstract
A sound enhancement technique that uses transfer functions ai,g of sounds that come from each of one or more positions/directions that are assumed to be sound sources arriving at each microphone to obtain a filter for a position that is a target of sound enhancement, where i denotes a direction and g denotes a distance for identifying each of the positions. Each of the transfer functions ai,g is represented by sum of a transmission characteristic of a direct sound that directly arrives from the position determined by the direction i and the distance g and a transmission characteristic of one or more reflected sounds produced by reflection of the direct sound off an reflective object. A filter that corresponds to the position that is the target of sound enhancement is applied to frequency-domain signals transformed from M picked-up sounds picked up with M microphones to obtain a frequency-domain output signal.
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Citations
29 Claims
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1. A sound enhancement method of obtaining a frequency-domain output signal in which a sound from a desired position determined by a direction and a distance is enhanced by applying, for each frequency, a filter enhancing a sound from the position to frequency-domain signals transformed from M picked-up sounds picked up with M microphones, where M is an integer greater than or equal to two, the method comprising:
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a filter design step of using a transmission characteristic ai,g of a sound that comes from each of one or a plurality of positions that are assumed to be sound sources and arrives at each of the microphones to obtain the filter for each frequency for a position that is a target of a sound enhancement, where i denotes a direction and g denotes a distance for identifying each of the positions; and a filter applying step of applying the filter obtained at the filter design step to the frequency-domain signals for each frequency to obtain the output signal; wherein each of the transfer functions ai,g is represented by the sum of a transmission characteristic of a direct sound that comes from the position determined by the direction i and the distance g and directly arrives at the M microphones and a transmission characteristic of one or more reflected sounds, the one or more reflected sounds being produced by reflection of the direct sound off an reflective object and arriving at the M microphones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 29)
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13. A sound enhancement apparatus obtaining a frequency-domain output signal in which a sound from a desired position determined by a direction and a distance is enhanced by applying, for each frequency, a filter enhancing a sound from the position to frequency-domain signals transformed from M picked-up sounds picked up with M microphones, where M is an integer greater than or equal to two, the apparatus comprising:
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a filter design section using a transmission characteristic ai,g of a sound that comes from each of one or a plurality of positions that are assumed to be sound sources and arrives at each of the microphones to obtain the filter for each frequency for a position that is a target of a sound enhancement, where i denotes a direction and g denotes a distance for identifying each of the positions; and a filter applying section applying the filter obtained by the filter design section to the frequency-domain signals for each frequency to obtain the output signal; wherein each of the transfer functions ai,g is represented by the sum of a transmission characteristic of a direct sound that comes from the position determined by the direction i and the distance g and directly arrives at the M microphones and a transmission characteristic of one or more reflected sounds, the one or more reflected sounds being produced by reflection of the direct sound off an reflective object and arriving at the M microphones. - View Dependent Claims (14)
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15. A sound enhancement method of obtaining a frequency-domain output signal in which a sound from a desired direction is enhanced by applying, for each frequency, a filter enhancing a sound from the direction to frequency-domain signals transformed from M picked-up sounds picked up with M microphones, where M is an integer greater than or equal to two, the method comprising:
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a filter design step of using a transmission characteristic aφ
of a sound that comes from each of one or a plurality of directions φ
that are assumed to be directions from which sounds come and arrives at each of the microphones to obtain the filter for each frequency for a direction that is a target of a sound enhancement; anda filter applying step of applying the filter obtained at the filter design step to the frequency-domain signals for each frequency to obtain the output signal; wherein each of the transfer functions aφ
is represented by the sum of a transmission characteristic of a direct sound that comes from the direction φ and
directly arrives at the M microphones and a transmission characteristic of one or more reflected sounds, the one or more reflected sounds being produced by reflection of the direct sound off an reflective object and arriving at the M microphones. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A sound enhancement apparatus obtaining a frequency-domain output signal in which a sound from a desired direction is enhanced by applying, for each frequency, a filter enhancing a sound from the direction to frequency-domain signals transformed from M picked-up sounds picked up with M microphones, where M is an integer greater than or equal to two, the method comprising:
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a filter design section using a transmission characteristic aφ
of a sound that comes from each of one or a plurality of directions φ
that are assumed to be directions from which sounds come and arrives at each of the microphones to obtain the filter for each frequency for a direction that is a target of a sound enhancement; anda filter applying section applying the filter obtained by the filter design section to the frequency-domain signals for each frequency to obtain the output signal; wherein each of the transfer functions aφ
is represented by the sum of a transmission characteristic of a direct sound that comes from the direction φ and
directly arrives at the M microphones and a transmission characteristic of one or more reflected sounds, the one or more reflected sounds being produced by reflection of the direct sound off an reflective object and arriving at the M microphones. - View Dependent Claims (27)
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28. (canceled)
Specification