Reverberation fingerprint estimation
Examples of the disclosure describe systems and methods for estimating acoustic properties of an environment. In an example method, a first audio signal is received via a microphone of a wearable head device. An envelope of the first audio signal is determined, and a first reverberation time is estimated based on the envelope of the first audio signal. A difference between the first reverberation time and a second reverberation time is determined. A change in the environment is determined based on the difference between the first reverberation time and the second reverberation time. A second audio signal is presented via a speaker of a wearable head device, wherein the second audio signal is based on the second reverberation time.
1. A method comprising:
receiving, via a microphone, an audio signal;
receiving, via a sensor, sensor data indicative of a real-world environment;
determining an envelope of the audio signal;
estimating a reverberation time based on the envelope of the audio signal, wherein said estimating the reverberation time comprises determining a difference between a first reverberation time and a second reverberation time; and
based on the estimated reverberation time and based further on the sensor data, determining a location in the real-world environment.
2. The method of claim 1 , wherein said estimating the reverberation time comprises determining, based on the envelope of the audio signal, whether a decay time is greater than a threshold amount of time.
3. The method of claim 1 , wherein said estimating the reverberation time comprises determining whether a correlation of a linear fit with the audio signal is greater than a threshold correlation.
4. The method of claim 1 , further comprising estimating a first reverberation gain based on the envelope of the audio signal, wherein said determining the location in the real-world environment is based further on the estimated first reverberation gain.
5. The method of claim 4 , wherein said estimating the first reverberation gain comprises detecting an impulse signal.
6. The method of claim 4 , wherein said estimating the first reverberation gain comprises presenting, via a speaker, an impulse signal.
7. The method of claim 1 , wherein:
said determining the envelope of the audio signal comprises applying a bandpass filter to the audio signal.
8. The method of claim 1 , wherein:
a wearable head device comprises the microphone and the sensor, and
the location in the real-world environment comprises a location of the wearable head device.
9. The method of claim 8 , further comprising presenting a virtual object on a display of the wearable head device based on the determined location.
10. The method of claim 1 , further comprising determining, based on the estimated reverberation time and based further on the sensor data, an orientation in the real-world environment.
11. The method of claim 1 , wherein the location in the real-world environment is determined further based on an acoustic property of the real-world environment.
12. A system comprising:
a microphone;
a sensor; and
one or more processors configured to perform a method comprising:
receiving, via the microphone, an audio signal;
receiving, via the sensor, sensor data indicative of a real-world environment;
determining an envelope of the audio signal;
estimating a reverberation time based on the envelope of the audio signal, wherein said estimating the reverberation time comprises determining a difference between a first reverberation time and a second reverberation time; and
based on the estimated reverberation time and based further on the sensor data, determining a location in the real-world environment.
13. The system of claim 12 , wherein said estimating the reverberation time comprises determining, based on the envelope of the audio signal, whether a decay time is greater than a threshold amount of time.
14. The system of claim 13 , wherein the method further comprises determining, based on the estimated reverberation time and based further on the sensor data, an orientation in the real-world environment.
15. The system of claim 13 , wherein the location in the real-world environment is determined further based on an acoustic property of the real-world environment.
16. The system of claim 12 , wherein said estimating the reverberation time comprises determining whether a correlation of a linear fit with the audio signal is greater than a threshold correlation.
17. The system of claim 12 , wherein the method further comprises estimating a first reverberation gain based on the envelope of the audio signal and said determining the location in the real-world environment is based further on the estimated first reverberation gain.
18. The system of claim 12 , further comprising a wearable head device comprising the microphone and the sensor, wherein the location in the real-world environment comprises a location of the wearable head device.
19. The system of claim 18 , wherein the method further comprises presenting a virtual object on a display of the wearable head device based on the determined location.
20. A non-transitory computer-readable medium storing instructions that, when executed by one or more processors, cause the one or more processors to perform a method comprising:
receiving, via a microphone, an audio signal;
receiving, via a sensor, sensor data indicative of a real-world environment;
determining an envelope of the audio signal;
estimating a reverberation time based on the envelope of the audio signal, wherein said estimating the reverberation time comprises determining a difference between a first reverberation time and a second reverberation time; and
based on the estimated reverberation time and based further on the sensor data, determining a location in the real-world environment.