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 of a wearable head device comprising a see-through display and a sensor, an audio signal;
presenting, via the see-through display, a view of a real-world environment;
concurrently with presenting the view of the real-world environment, presenting, via the see-through display, a view of a virtual environment;
receiving, via the sensor of the wearable head device, sensor data indicative of the 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 of the wearable head device in the real-world environment.
2. The method of claim 1 , wherein said estimating the reverberation time comprises determining if the envelope of the audio signal is decaying for a time greater than a threshold amount of time.
3. The method of claim 1 , wherein said estimating the reverberation time comprises:
determining a linear fit of a decaying region in the envelope of the audio signal; and
determining if the linear fit has a correlation 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 of the wearable head device 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 a clapping sound.
6. The method of claim 4 , wherein said estimating the first reverberation gain comprises presenting, via the speaker of the wearable head device, 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. A system comprising:
a wearable head device comprising a see-through display;
a microphone of the wearable head device;
a sensor of the wearable head device; and
one or more processors configured to perform a method comprising:
presenting, via the see-through display, a view of a real-world environment;
concurrently with presenting the view of the real-world environment, presenting, via the see-through display, a view of a virtual environment;
receiving, via the sensor of the wearable head device, sensor data indicative of the real-world environment;
receiving, via the microphone of the wearable head device, an audio signal;
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 of the wearable head device in the real-world environment.
9. The system of claim 8 , wherein said estimating the reverberation time comprises determining if the envelope of the audio signal is decaying for a time greater than a threshold amount of time.
10. The system of claim 8 , wherein said estimating the reverberation time comprises:
determining a linear fit of a decaying region in the envelope of the audio signal; and
determining if the linear fit has a correlation greater than a threshold correlation.
11. The system of claim 8 , wherein the method further comprises estimating a first reverberation gain based on the envelope of the audio signal, wherein said determining the location of the wearable head device in the real-world environment is based further on the estimated first reverberation gain.
12. The system of claim 11 , wherein said estimating the first reverberation gain comprises detecting a clapping sound.
13. The system of claim 11 , wherein said estimating the first reverberation gain comprises presenting, via a speaker of the wearable head device, an impulse signal.
14. 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 of a wearable head device comprising a see-through display and a sensor, an audio signal;
presenting, via the see-through display, a view of a real-world environment;
concurrently with presenting the view of the real-world environment, presenting, via the see-through display, a view of a virtual environment;
receiving, via the sensor of the wearable head device, sensor data indicative of the 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 of the wearable head device in the real-world environment.
15. The non-transitory computer-readable medium of claim 14 , wherein said estimating the first reverberation time comprises determining if the envelope of the audio signal is decaying for a time greater than a threshold amount of time.
16. The non-transitory computer-readable medium of claim 14 , wherein said estimating the reverberation time comprises:
determining a linear fit of a decaying region in the envelope of the audio signal; and
determining if the linear fit has a correlation greater than a threshold correlation.
17. The non-transitory computer-readable medium of claim 14 , wherein the method further comprises estimating a first reverberation gain based on the envelope of the audio signal, wherein said determining the location of the wearable head device in the real-world environment is based further on the estimated first reverberation gain.
18. The non-transitory computer-readable medium of claim 17 , wherein said estimating the first reverberation gain comprises detecting a clapping sound.
19. The non-transitory computer-readable medium of claim 17 , wherein said estimating the first reverberation gain comprises presenting, via a speaker of the wearable head device, an impulse signal.
20. The non-transitory computer-readable medium of claim 14 , wherein:
said determining the envelope of the audio signal comprises applying a bandpass filter to the audio signal.