초록 ▼

A method for suppressing ambient noise using multiple audio signals may include providing at least two audio signals captured by at least two electro-acoustic transducers. The at least two audio signals may include desired audio and ambient noise. The method may also include performing beamforming o

A method for suppressing ambient noise using multiple audio signals may include providing at least two audio signals captured by at least two electro-acoustic transducers. The at least two audio signals may include desired audio and ambient noise. The method may also include performing beamforming on the at least two audio signals in order to obtain a desired audio reference signal that is separate from a noise reference signal.

대표청구항 ▼

1. A method for generating reference signals using multiple audio signals, comprising: providing at least two audio signals by at least two electro-acoustic transducers, wherein the at least two audio signals comprise desired audio and ambient noise;performing beamforming on the at least two audio s

1. A method for generating reference signals using multiple audio signals, comprising: providing at least two audio signals by at least two electro-acoustic transducers, wherein the at least two audio signals comprise desired audio and ambient noise;performing beamforming on the at least two audio signals in order to obtain a desired audio reference signal that is separate from a noise reference signal; andperforming additional beamforming, with a second beamformer, based on a noise reference signal, to remove additional noise from the desired audio reference signal. 2. The method of claim 1, wherein the residual desired audio is high-frequency residual desired audio. 3. The method of claim 1, wherein the method is implemented by a communication device, and wherein the desired audio comprises speech. 4. The method of claim 1, wherein the at least two electro-acoustic transducers are microphones. 5. The method of claim 1, further comprising calibrating the at least two signals in order to balance desired audio energy between the at least two signals. 6. The method of claim 1, further comprising calibrating the refined noise reference signal to compensate for attenuation effects caused by the beamforming. 7. The method of claim 6, wherein calibrating the refined noise reference signal comprises: filtering the refined noise reference signal in order to obtain at least two sub-bands;calculating calibration factors, a separate calibration factor being calculated for each sub-band;calibrating the sub-bands by multiplying the sub-bands by the calibration factors; andsumming the calibrated sub-bands. 8. The method of claim 1, wherein the beamforming comprises fixed beamforming. 9. The method of claim 1, wherein the beamforming comprises adaptive beamforming. 10. The method of claim 1 wherein performing additional beamforming comprises: low-pass filtering a calibrated, refined noise reference signal; andperforming adaptive filtering on the low-pass filtered, calibrated, refined noise reference signal. 11. The method of claim 1, wherein the noise reference signal is refined by removing residual desired audio from the noise reference signal, thereby obtaining a refined noise reference signal. 12. An apparatus for generating reference signals using multiple audio signals, comprising: at least two electro-acoustic transducers that provide at least two audio signals comprising desired audio and ambient noise;a beamformer that is capable of performing beamforming on the at least two audio signals in order to obtain a desired audio reference signal that is separate from a noise reference signal; anda second beamformer that is capable of performing additional beamforming, with a second beamformer, based on a noise reference signal, to remove additional noise from the desired audio reference signal. 13. The apparatus of claim 12, wherein the residual desired audio is high-frequency residual desired audio. 14. The apparatus of claim 12, wherein the apparatus is a communication device, and wherein the desired audio comprises speech. 15. The apparatus of claim 12, wherein the at least two electro-acoustic transducers are microphones. 16. The apparatus of claim 12, further comprising a calibrator that calibrates the at least two signals in order to balance desired audio energy between the at least two signals. 17. The apparatus of claim 12, further comprising a noise reference calibrator that calibrates the refined noise reference signal to compensate for attenuation effects caused by the beamforming. 18. The apparatus of claim 17, wherein the noise reference calibrator comprises: at least two filters that filter the refined noise reference signal in order to obtain at least two sub-bands;a calibration unit that calculates calibration factors, a separate calibration factor being calculated for each sub-band;at least two multipliers that calibrate the sub-bands by multiplying the sub-bands by the calibration factors; andan adder that sums the calibrated sub-bands. 19. The apparatus of claim 12, wherein the beamformer is a fixed beamformer. 20. The apparatus of claim 12, wherein the beamformer is an adaptive beamformer. 21. The apparatus of claim 12, wherein the second beamformer comprises: a low-pass filter that is capable of performing low-pass filtering on a calibrated, refined noise reference signal; andan adaptive filter that is capable of performing adaptive filtering on the low-pass filtered, calibrated, refined noise reference signal. 22. The apparatus of claim 12, further comprising a noise reference refiner that is capable of refining the noise reference signal by removing residual desired audio from the noise reference signal, thereby obtaining a refined noise reference signal. 23. An apparatus for generating reference signals using multiple audio signals, comprising: means for providing at least two audio signals by at least two electro-acoustic transducers, wherein the at least two audio signals comprise desired audio and ambient noise;means for performing beamforming on the at least two audio signals in order to obtain a desired audio reference signal that is separate from a noise reference signal; andmeans for performing additional beamforming, with a second beamformer, based on a noise reference signal, to remove additional noise from the desired audio reference signal. 24. The apparatus of claim 23, wherein the residual desired audio is high-frequency residual desired audio. 25. The apparatus of claim 23, further comprising means for calibrating the at least two signals in order to balance desired audio energy between the at least two signals. 26. The apparatus of claim 23, further comprising means for calibrating the refined noise reference signal to compensate for attenuation effects caused by the beamforming. 27. The apparatus of claim 26, wherein the means for calibrating the refined noise reference signal comprises: means for filtering the refined noise reference signal in order to obtain at least two sub-bands;means for calculating calibration factors, a separate calibration factor being calculated for each sub-band;means for calibrating the sub-bands by multiplying the sub-bands by the calibration factors; andmeans for summing the calibrated sub-bands. 28. The apparatus of claim 23, wherein, the means for performing additional beamforming comprises: means for low-pass filtering a calibrated, refined noise reference signal, thereby obtaining a low-pass filtered, calibrated, refined noise reference signal; andmeans for performing adaptive filtering on the low-pass filtered, calibrated, refined noise reference signal. 29. The apparatus of claim 23, further comprising means for refining the noise reference signal by removing residual desired audio from the noise reference signal, thereby obtaining a refined noise reference signal. 30. A computer-program product for generating reference signals using multiple audio signals, the computer-program product comprising a non-transitory, computer-readable medium having instructions thereon, the instructions comprising: code for providing at least two audio signals by at least two electro-acoustic transducers, wherein the at least two audio signals comprise desired audio and ambient noise;code for performing beamforming on the at least two audio signals in order to obtain a desired audio reference signal that is separate from a noise reference signal; andcode for performing additional beamforming, with a second beamformer, based on a noise reference signal, to remove additional noise from the desired audio reference signal. 31. The computer-program product of claim 30, wherein the residual desired audio is high-frequency residual desired audio. 32. The computer-program product of claim 30, further comprising code for calibrating the at least two signals in order to balance desired audio energy between the at least two signals. 33. The computer-program product of claim 30, further comprising code for calibrating the refined noise reference signal to compensate for attenuation effects caused by the beamforming. 34. The computer-program product of claim 33, wherein the code for calibrating the refined noise reference signal comprises: code for filtering the refined noise reference signal in order to obtain at least two sub-bands;code for calculating calibration factors, a separate calibration factor being calculated for each sub-band;code for calibrating the sub-bands by multiplying the sub-bands by the calibration factors; andcode for summing the calibrated sub-bands. 35. The computer-program product of claim 30, wherein the code for performing additional beamforming comprises: code for low-pass filtering a calibrated, refined noise reference signal, thereby obtaining a low-pass filtered, calibrated, refined noise reference signal; andcode for performing adaptive filtering on the low-pass filtered, calibrated, refined noise reference signal. 36. The computer-program product of claim 30, further comprising code for refining the noise reference signal by removing residual desired audio from the noise reference signal, thereby obtaining a refined noise reference signal.