AMBIENT NOISE SUPPRESSION
First Claim
1. A method for suppressing ambient noise from a captured audio signal, the method comprising:
- detecting a parameter of a variable ambient noise source;
determining a first power spectrum representing the variable ambient noise source based on the detected parameter, the first power spectrum being determined independent of the captured audio signal;
determining a second power spectrum representing the captured audio signal;
comparing the first power spectrum to the second power spectrum to identify at least one frequency range where net power of the first power spectrum and net power of the second power spectrum satisfy relativity criteria; and
suppressing the at least one identified frequency range of the captured audio signal by an amount linearly proportional to a ratio of the first power spectrum to the second power spectrum.
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Accused Products
Abstract
Ambient noise can be suppressed from a captured audio signal by detecting a parameter of a variable ambient noise source and determining a first power spectrum representing the variable ambient noise source based on the detected parameter. If the first power spectrum is compared to a second power spectrum that is determined for the captured audio signal, the two power spectra can be compared to identify a frequency range where net power of the first power spectrum and net power of the second power spectrum satisfy relativity criteria. Suppressing the audio signal within the identified frequency range has the effect of reducing degradation of a voice communication present in the audio signal.
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Citations
20 Claims
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1. A method for suppressing ambient noise from a captured audio signal, the method comprising:
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detecting a parameter of a variable ambient noise source; determining a first power spectrum representing the variable ambient noise source based on the detected parameter, the first power spectrum being determined independent of the captured audio signal; determining a second power spectrum representing the captured audio signal; comparing the first power spectrum to the second power spectrum to identify at least one frequency range where net power of the first power spectrum and net power of the second power spectrum satisfy relativity criteria; and suppressing the at least one identified frequency range of the captured audio signal by an amount linearly proportional to a ratio of the first power spectrum to the second power spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for suppressing ambient noise from a captured audio signal comprising:
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an ambient noise assessor stored in memory and executable by a processor to detect a parameter of a variable ambient noise source and determine a first power spectrum representing the variable ambient noise source based on the detected parameter, the first power spectrum being determined independent of the captured audio signal; a comparator stored in the memory and executable by the processor to; determine a second power spectrum representing the captured audio signal; and compare the first power spectrum to the second power spectrum to identify at least one frequency range where net power of the first power spectrum and net power of the second power spectrum satisfy relativity criteria; and a noise suppressor stored in the memory and executable by the processor to suppress the at least one identified frequency range of the captured audio signal by an amount linearly proportional to a ratio of the first power spectrum to the second power spectrum. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. One or more storage devices encoding computer-executable instructions for executing on a computer system a computer process for suppressing ambient noise from a captured audio signal, the computer process comprising:
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detecting a parameter of a variable ambient noise source; determining a first power spectrum representing the variable ambient noise source based on the detected parameter, the first power spectrum being determined independent of the captured audio signal; determining a second power spectrum representing the captured audio signal; comparing the first power spectrum to the second power spectrum to identify at least one frequency range where net power of the first power spectrum and net power of the second power spectrum satisfy relativity criteria; and suppressing the at least one identified frequency range of the captured audio signal by an amount linearly proportional to a ratio of the first power spectrum to the second power spectrum. - View Dependent Claims (18, 19, 20)
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Specification