Method and device for processing binaural audio signal generating additional stimulation

1. An audio signal processing device comprising:

a binaural renderer configured to receive an audio signal and output a binaural-rendered audio signal by performing binaural rendering based on the received audio signal; and

an extra exciter comprising a first excitation transducer placed in front of a user and a second excitation transducer placed at the back of the user,

wherein the first and second transducers generate different stimulations in response to a position of a sound source simulated by the binaural-rendered audio signal,

wherein the extra exciter is configured to select at least one of the first and second excitation transducers according to the position of the sound source and to generate a stimulation through the selected excitation transducer only, wherein the stimulation corresponds to the binaural-rendered audio signal.

2. The audio signal processing device of claim 1 , wherein the extra exciter is configured to generate the stimulations to a head of the user.

3. The audio signal processing device of claim 1 , wherein the extra exciter generates the stimulation based on a distance between the user and the position of the sound source simulated by the binaural-rendered audio signal.

4. The audio signal processing device of claim 1 , wherein the extra exciter generates the stimulation in at least one of a case where an interaural level difference of the binaural-rendered audio signal is smaller than a first reference value and a case where an interaural time difference of the binaural-rendered audio signal is smaller than a second reference value.

5. The audio signal processing device of claim 1 , wherein the extra exciter generates an additional stimulation based on a frequency value of a notch included in a head related transfer function (HRTF) applied to the binaural rendering.

6. The audio signal processing device of claim 5 , wherein the extra exciter determines whether to generate the additional stimulation based on the frequency value of the notch included in the HRTF.

7. The audio signal processing device of claim 5 , wherein the extra exciter determines a position at which the additional stimulation is to be generated, based on the frequency value of the notch included in the HRTF.

8. The audio signal processing device of claim 1 ,

wherein the received audio signal comprises a first audio signal output through the extra exciter and a second audio signal output through the binaural renderer,

wherein the second audio signal is generated based on an audio signal obtained by subtracting the first audio signal from the received audio signal.

9. The audio signal processing device of claim 8 , wherein the binaural renderer separates the received audio signal into the first audio signal and the second audio signal according to a frequency characteristic of the received audio signal.

10. The audio signal processing device of claim 8 , wherein the binaural renderer applies, to the received audio signal, a head related transfer function (HRTF) for modeling a remaining region excepting a frequency band corresponding to the first audio signal.

11. The audio signal processing device of claim 1 , wherein the stimulation is synchronized with a time of the binaural-rendered audio signal.

12. The audio signal processing device of claim 1 , wherein the extra exciter generates the stimulation based on a magnitude of the binaural-rendered audio signal.

13. The audio signal processing device of claim 1 , wherein the extra exciter generates the stimulation according to a scaling value applied to a step of discriminating a magnitude of the stimulation,

wherein the scaling value is determined based on a noise of an external environment of the user.

14. A method for operating an audio signal processing device, the method comprising the steps of:

receiving, by a binaural renderer, an audio signal;

outputting, by the binaural renderer, a binaural-rendered audio signal by performing binaural rendering based on the received audio signal; and

selecting, by an extra exciter, at least one of a first excitation transducer placed in front of a user and a second excitation transducer placed at the back of the user, and generating a stimulation through the selected excitation transducer only, wherein the stimulation corresponds to the binaural-rendered audio signal, wherein the first and second transducers generate different stimulations in response to a position of a sound source simulated by the binaural-rendered audio signal.