Location based audio signal message processing
At least one exemplary embodiment is directed to modifying audio content using location specific spatial impulse responses.
1. A method to modify an acoustic signal received by a user, comprising:
determining a location and an orientation of a user in a virtual environment at time t1;
determining a location and an orientation of a first virtual audio source;
determining a location and an orientation of a second virtual audio source;
determining a navigational information of the user at the time t1;
receiving a first environmental impulse response associated with the first virtual audio source;
receiving a second environmental impulse response associated with the second virtual audio source;
receiving an audio signal;
modifying the first environmental impulse based upon a difference between the location and orientation of the first virtual audio source and the location and orientation of the user;
modifying the second environmental impulse based upon a difference between the location and orientation of the second virtual audio source and the location and orientation of the user;
convolving the audio signal using the modified first environmental impulse and the modified second environmental impulse; and
directing the convolved audio signal to a loudspeaker.
2. The method according to claim 1 , further comprising:
displaying the location of the user as a location in the virtual environment.
3. The method according to claim 2 , further comprising:
displaying the orientation of the user as an orientation in the virtual environment.
4. The method according to claim 3 , further comprising:
displaying movement of the user in the virtual environment corresponding to the navigational information of the user.
5. The method according to claim 4 , further comprising:
determining a location and orientation of a user in a virtual environment at time t2; and
generating a change in location of the user from time t1 to time t2.
6. The method according to claim 5 , further comprising:
generating a change in orientation of the user from time t1 to time t2.
7. The method according to claim 5 , further comprising;
updating the modified first environmental impulse if the change in location is above a threshold value.
8. The method according to claim 6 , further comprising;
updating the modified first environmental impulse if the change in orientation is above a threshold value.
9. The method according to claim 1 where the location of a user is determined using a GPS system.
10. The method according to claim 7 , where the threshold is 15 meters.
11. The method according to claim 4 , further comprising:
receiving a user's non-virtual location and orientation.
12. The method according to claim 11 , further comprising:
receiving a non-virtual obstacle's location and orientation with respect to the user's non-virtual location and orientation.
13. The method according to claim 12 , further comprising:
displaying the obstacle in the virtual environment.