Signal processing device, signal processing method, and program

1. A signal processing device comprising:

memory storing instructions:

a processor configured to implement the instructions to cause the signal processing device to:

obtain an acoustic signal;

obtain sound source positional information relating to a distance between a sound source and a sound collecting unit that collects sound from the sound source;

obtain listening positional information relating to a distance between a reproducing device that reproduces the acoustic signal and a listener who listens to sound reproduced by the reproducing device; and

correct a gain of the acoustic signal on a basis of the sound-source positional information and the listening positional information;

wherein in a case where the distance shown by the sound-source positional information is a distance r 1 and the distance shown by the listening positional information is a distance r 2 , the processor multiplies the acoustic signal by (r 1 −r 2 )/(r 1 +r 2 ).

2. The signal processing device according to claim 1 , wherein the processor is further configured to:

correct the gain of the acoustic signal, thereby restoring a relationship of a difference of sound pressure between a plurality of sound sources.

3. The signal processing device according to claim 1 , wherein

the distance shown by the listening positional information has a fixed value.

4. The signal processing device according to claim 1 , wherein the processor is further configured to:

obtain the acoustic signal via a network, and

obtain the sound-source positional information via a network.

5. The signal processing device according to claim 1 , wherein the processor is further configured to:

obtain the listening positional information via a network.

6. The signal processing device according to claim 1 , wherein

in a case where there is a plurality of listeners, the listening positional information is an average value of distances between of the respective listeners and the reproducing device, a distance to a listener existing at the closest position to the reproducing device among the plurality of the listeners, or a fixed value.

7. A signal processing method comprising steps of:

obtaining an acoustic signal;

obtaining sound-source positional information relating to a distance between a sound source and a sound collecting unit that collects sound from the sound source;

obtaining listening positional information relating to a distance between a reproducing device that reproduces the acoustic signal and a listener who listens to sound reproduced by the reproducing device; and

correcting gain of the acoustic signal on a basis of the sound-source positional information and the listening positional information;

wherein in a case where the distance shown by the sound-source positional information is a distance r 1 and the distance shown by the listening positional information is a distance r 2 , the correcting multiplies the acoustic signal by (r 1 −r 2 )/(r 1 +r 2 ).

8. A non-transitory computer readable storage medium having computer readable instructions stored thereon that, when executed, cause a computer to execute processing comprising steps of:

obtaining an acoustic signal;

obtaining sound-source positional information relating to a distance between a sound source and a sound collecting unit that collects sound from the sound source;

obtaining listening positional information relating to a distance between a reproducing device that reproduces the acoustic signal and a listener who listens to sound reproduced by the reproducing device; and

correcting gain of the acoustic signal on a basis of the sound-source positional information and the listening positional information;

wherein in a case where the distance shown by the sound-source positional information is a distance r 1 and the distance shown by the listening positional information is a distance r 2 , the correcting multiplies the acoustic signal by (r 1 −r 2 )/(r 1 +r 2 ).

9. A signal processing device comprising:

memory storing instructions:

a processor configured to implement the instructions to cause the signal processing device to:

collect sound from a sound source;

measure a distance between the sound source and the sound collecting unit;

obtain listening positional information relating to a distance between a reproducing device that reproduces an acoustic signal of the sound collected by the sound collecting unit and a listener who listens to sound reproduced by the reproducing device; and

correct a gain of the acoustic signal on a basis of the measured distance and the distance shown by the listening positional information;

wherein in a case where the distance shown by the sound-source positional information is a distance r 1 and the distance shown by the listening positional information is a distance r 2 , the processor multiplies the acoustic signal by (r 1 −r 2 )/(r 1 +r 2 ).

10. The signal processing device according to claim 9 , wherein

the corrected acoustic signal corrected is supplied to the reproducing device.

11. The signal processing device according to claim 9 , wherein

the sound collecting unit includes a microphone array, and

the processor calculates mutual correlation of sound collected by the microphone array, and measures a distance to the sound source by using a distance between microphones that collect sound with high correlation.

12. The signal processing device according to claim 9 , wherein the processor is further configured to:

analyze an image obtained by capturing an image of the sound source and measure a distance to the sound source.

13. The signal processing device according to claim 9 , wherein the processor is further configured to:

measure a distance between the sound source and the sound collecting unit by using a GPS.

14. The signal processing device according to claim 9 , wherein

the sound collecting unit includes a microphone that collects sound in proximity of the sound source, and

the processor sets a predetermined position as a reference, and measures a distance between the predetermined position and the microphone.

15. A signal processing method comprising steps of:

collecting sound form a sound source;

measuring a distance between the sound source and a sound collecting unit that collects the sound;

obtaining listening positional information relating to a distance between a reproducing device that reproduces an acoustic signal of the collected sound and a listener who listens to sound reproduced by the reproducing device; and

correcting gain of the acoustic signal on a basis of the measured distance and the distance shown by the listening positional information;

wherein in a case where the distance shown by the sound-source positional information is a distance r 1 and the distance shown by the listening positional information is a distance r 2 , the correcting multiplies the acoustic signal by (r 1 −r 2 )/(r 1 +r 2 ).

16. A non-transitory computer readable storage medium having computer readable instructions stored thereon that, when executed, cause a computer to execute processing comprising steps of:

collecting sound from a sound source;

measuring a distance between the sound source and a sound collecting unit that collects the sound;

obtaining listening positional information relating to a distance between a reproducing device that reproduces an acoustic signal of the collected sound and a listener who listens to sound reproduced by the reproducing device; and

correcting gain of the acoustic signal on a basis of the measured distance and the distance shown by the listening positional information;

wherein in a case where the distance shown by the sound-source positional information is a distance r 1 and the distance shown by the listening positional information is a distance r 2 , the correcting multiplies the acoustic signal by (r 1 −r 2 )/(r 1 +r 2 ).