Psychoacoustic adaptive notch filtering
First Claim
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1. A method for performing adaptive notch filtering, the method comprising:
- receiving an input signal containing tone-like noise having a power spectral density that includes at least one peak;
determining whether tone-like noise is present in a particular critical band of the input signal, including analyzing the input signal to determine a frequency for the at least one peak and to determine whether the frequency is within the critical band; and
in response to a determination that the tone-like noise is present;
estimating an amplitude of the tone-like noise; and
estimating how much energy is contained in the particular critical band;
determining at least one suppression factor for the tone-like noise based on the estimated amplitude and energy;
selecting a notch filter based on the determined at least one suppression factor; and
applying the selected notch filter to the input signal.
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Abstract
Improved systems and methods for psychoacoustic adaptive notch filtering are provided. By accounting for psychoacoustic properties of an audio signal as well as finer characteristics of noise which may be present in the audio signal (e.g., the shape of the spectral density of the noise), more effective strategies for dealing with undesirable components of the audio signal may be realized.
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Citations
21 Claims
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1. A method for performing adaptive notch filtering, the method comprising:
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receiving an input signal containing tone-like noise having a power spectral density that includes at least one peak; determining whether tone-like noise is present in a particular critical band of the input signal, including analyzing the input signal to determine a frequency for the at least one peak and to determine whether the frequency is within the critical band; and in response to a determination that the tone-like noise is present; estimating an amplitude of the tone-like noise; and estimating how much energy is contained in the particular critical band; determining at least one suppression factor for the tone-like noise based on the estimated amplitude and energy; selecting a notch filter based on the determined at least one suppression factor; and applying the selected notch filter to the input signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method for performing adaptive notch filtering, the method comprising:
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receiving an input signal containing tone-like noise having a power spectral density that includes at least one peak; determining how much energy is contained in at least one predefined frequency band of the input signal; determining a level of tone-like noise present in the at least one predefined band based on the determined amount of energy, including analyzing the input signal to determine a frequency for the at least one peak within the at least one predefined band; selecting a notch filter based on the determined level; and applying the selected notch filter to the input signal. - View Dependent Claims (7, 8, 9, 10, 11)
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12. An electronic device comprising:
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a receiver configured to receive an input signal containing tone-like noise having a power spectral density that includes at least one peak, and an adaptive notch filtering system configured to; determine how much energy is contained in at least one predefined frequency band of the input signal; determine a level of tone-like noise present in the at least one predefined band based on the determined amount of energy, including analyzing the input signal to determine a frequency for the at least one peak within the at least one predefined band; select a notch filter based on the determined level; and apply the selected notch filter to the input signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A non-transitory computer readable medium storing a program configured to cause a computer to execute an adaptive notch filtering process, the filtering process comprising:
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identifying an input signal containing tone-like noise having a power spectral density that includes at least one peak; determining how much energy is contained in at least one predefined frequency band of the input signal; determining a level of tone-like noise present in the at least one predefined band based on the determined amount of energy, including analyzing the input signal to determine a frequency for the at least one peak within the at least one predefined band; selecting a notch filter based on the determined level; and applying the selected notch filter to the input signal.
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Specification