Signal processing device and method, and program
The present technology relates to a signal processing device and method, and a program making it possible to reduce the computational complexity of decoding at low cost. A signal processing device includes: a priority information generation unit configured to generate priority information about an audio object on the basis of a plurality of elements expressing a feature of the audio object. The present technology may be applied to an encoding device and a decoding device.
1. A signal processing device comprising:
processing circuitry configured to generate priority information about an audio object on a basis of at least one element expressing a feature of the audio object,
wherein the element includes spread information, wherein the processing circuitry is configured to generate the priority information according to a product of a horizontal directional spread angle and a vertical directional spread angle, and wherein an audio signal of the audio object is decoded by a decoding device according to the priority information.
2. The signal processing device according to claim 1 , wherein the element comprises metadata of the audio object.
3. The signal processing device according to claim 2 , wherein the element comprises an indication of a position of the audio object in a space.
4. The signal processing device according to claim 3 , wherein the element comprises a distance from a reference position to the audio object in the space.
5. The signal processing device according to claim 3 , wherein the element comprises a horizontal direction angle indicating a position in a horizontal direction of the audio object in the space.
6. The signal processing device according to claim 2 , wherein the processing circuitry is configured to generate the priority information according to a movement speed of the audio object on a basis of the metadata.
7. The signal processing device according to claim 1 , wherein the element comprises gain information by which to multiply an audio signal of the audio object.
8. The signal processing device according to claim 7 , wherein the processing circuitry is configured to generate the priority information of a unit time to be processed, on a basis of a difference between the gain information of the unit time to be processed and an average value of the gain information of a plurality of unit times.
9. The signal processing device according to claim 7 , wherein the processing circuitry is configured to generate the priority information on a basis of a sound pressure of the audio signal multiplied by the gain information.
10. The signal processing device according to claim 1 , wherein the processing circuitry is configured to generate the priority information according to an area of a region of the audio object on a basis of the spread information.
11. The signal processing device according to claim 1 , wherein the spread information comprises angle information indicating a range of size of a sound image of the audio object.
12. The signal processing device according to claim 1 , wherein the element comprises information indicating an attribute of a sound of the audio object.
13. The signal processing device according to claim 1 , wherein the element is indicative of an audio signal of the audio object.
14. The signal processing device according to claim 13 , wherein the processing circuitry is configured to generate the priority information on a basis of a result of a voice activity detection process performed on the audio signal.
15. The signal processing device according to claim 1 , wherein the processing circuitry is configured to smooth the generated priority information in a time direction and to treat the smoothed priority information as final priority information.
16. A signal processing method executed by processing circuitry, the method comprising:
generating priority information about an audio object on a basis of at least one element expressing a feature of the audio object, wherein the element includes spread information, wherein the priority information is generated according to a product of a horizontal directional spread angle and a vertical directional spread angle, and wherein an audio signal of the audio object is decoded by a decoding device according to the priority information.
17. A non-transitory computer readable medium containing instructions that, when executed by processing circuitry, perform a process comprising:
generating priority information about an audio object on a basis of at least one element expressing a feature of the audio object, wherein the element includes spread information, wherein the priority information is generated according to a product of a horizontal directional spread angle and a vertical directional spread angle, and wherein an audio signal of the audio object is decoded by a decoding device according to the priority information.