Dynamic distortion elimination for output audio
View Patent ↗A method ( 200 ) for improving quality of output audio ( 126 ). The method can include detecting an output acoustic signal ( 128 ) and generating a receive audio signal ( 134 ) based, at least in part, on the detected output acoustic signal. A frequency domain representation ( 140 ) of the receive audio signal can be compared to a frequency domain representation ( 138 ) of a source audio signal ( 124 ) from which the output acoustic signal is generated. At least one distortion signal ( 142 ) in the receive audio signal can be identified, and the source audio signal can be selectively equalized to reduce an amplitude of the source audio signal at a frequency that correlates to the distortion signal.
1. A method for improving quality of output audio, comprising:
detecting an output acoustic signal;
generating a receive audio signal based, at least in part, on the detected output acoustic signal;
comparing a frequency domain representation of the receive audio signal to a frequency domain representation of a source audio signal from which the output acoustic signal is generated;
identifying at least one distortion signal in the receive audio signal; and
selectively equalizing the source audio signal to reduce an amplitude of the source audio signal at a frequency that correlates to the distortion signal.
2. The method of claim 1 , further comprising identifying a correlation between the distortion signal and the source audio signal by comparing a frequency domain representation of the distortion signal to the frequency domain representation of the source audio signal.
3. The method of claim 2 , wherein identifying the correlation between the distortion signal and the source audio signal comprises identifying frequency content in the source audio signal of which the distortion signal is a harmonic or a sub-harmonic.
4. The method of claim 1 , wherein generating the receive audio signal further comprises generating the receive audio signal based, at least in part, on a secondary acoustic signal generated by vibration of at least one device component.
5. The method of claim 1 , wherein comparing the frequency domain representation of the receive audio signal to the frequency domain representation of the source audio signal comprises measuring a difference between the frequency domain representation of the receive audio signal and the frequency domain representation of the source audio signal.
6. The method of claim 1 , further comprising performing a Fast Fourier Transform on the receive audio signal to generate the frequency domain representation of the receive audio signal.
7. The method of claim 1 , further comprising performing a Fast Fourier Transform on the source audio signal to generate the frequency domain representation of the source audio signal.
8. The method of claim 1 , wherein dynamically equalizing the source audio signal comprises updating at least one gain weighting factor for the frequency that correlates to the distortion signal.
9. The method of claim 8 , further comprising selectively returning the gain weighting factors to a previous value in response to the distortion signal subsiding.
10. The method of claim 1 , wherein detecting the output acoustic signal comprises detecting the output acoustic signal via an input audio transducer of a device.
11. The method of claim 10 , further comprising generating the output acoustic signal via an output audio transducer of the device.
12. An audio processing system, comprising:
an input audio transducer that detects an output acoustic signal;
an analog-to-digital converter that generates a receive audio signal based, at least in part, on the detected output acoustic signal;
a comparator that compares a frequency domain representation of the receive audio signal to a frequency domain representation of a source audio signal from which the output acoustic signal is generated;
a harmonic analyzer that identifies at least one distortion signal in the receive audio signal; and
a dynamic equalizer that selectively equalizes the source audio signal to reduce an amplitude of the source audio signal at a frequency that correlates to the distortion signal.
13. The audio processing system of claim 12 , wherein the harmonic analyzer identifies a correlation between the distortion signal and the source audio signal by comparing a frequency domain representation of the distortion signal to the frequency domain representation of the source audio signal.
14. The audio processing system of claim 13 , wherein the harmonic analyzer identifies frequency content in the source audio signal of which the distortion signal is a harmonic or a sub-harmonic.
15. The audio processing system of claim 12 , wherein the analog-to-digital converter generates the receive audio signal based, at least in part, on a secondary acoustic signal generated by vibration of at least one device component.
16. The audio processing system of claim 12 , wherein the comparator measures a difference between the frequency domain representation of the receive audio signal and the frequency domain representation of the source audio signal.
17. The audio processing system of claim 12 , further comprising a Fast Fourier Transform module that performs a Fast Fourier Transform on the receive audio signal to generate the frequency domain representation of the receive audio signal and performs a Fast Fourier Transform on the source audio signal to generate the frequency domain representation of the source audio signal.
18. The audio processing system of claim 12 , wherein the harmonic analyzer updates at least one gain weighting factor for the frequency that correlates to the distortion signal.
19. The audio processing system of claim 12 , further comprising an output audio transducer that generates the output acoustic signal.
20. A program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine to perform method steps for improving quality of output audio, said method steps comprising:
detecting an output acoustic signal via an input audio transducer;
generating a receive audio signal based, at least in part, on the detected output acoustic signal;
comparing a frequency domain representation of the receive audio signal to a frequency domain representation of a source audio signal from which the output acoustic signal is generated;
identifying at least one distortion signal in the receive audio signal; and
selectively equalizing the source audio signal to reduce an amplitude of the source audio signal at a frequency that correlates to the distortion signal.
21. A mobile station, comprising:
an input audio transducer that detects an output acoustic signal;
an analog-to-digital converter that generates a receive audio signal based, at least in part, on the detected output acoustic signal;
a comparator that compares a frequency domain representation of the receive audio signal to a frequency domain representation of a source audio signal from which the output acoustic signal is generated;
a harmonic analyzer that identifies at least one distortion signal in the receive audio signal; and
a dynamic equalizer that selectively equalizes the source audio signal to reduce an amplitude of the source audio signal at a frequency that correlates to the distortion signal.
22. The communication device of claim 21 , further comprising:
an output audio transducer that generates the output acoustic signal.