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US 11,636,868 B2Granted
Audio processing method for performing audio pass-through and related apparatus
AssigneeRealtek Semiconductor Corp.
InventorWei-Hung He
Life of this patent
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Abstract
An audio processing method includes: converting a time-domain audio signal into a frequency-domain audio signal; determining a noise reduction gain according to the frequency-domain audio signal; and selecting at least one set of time-domain filter coefficients from a plurality sets of time-domain filter coefficients according to the noise reduction gain; configuring a time-domain filter according to the at least one selected set of time-domain filter coefficients, and filtering the time-domain audio signal with the time-domain filter.
Claims12
An audio processing method, comprising:
- converting a time-domain audio signal into a frequency-domain audio signal;
- determining a noise reduction gain according to the frequency-domain audio signal;
- selecting a set of time-domain filter coefficients from a plurality sets of predetermined time-domain filter coefficients according to the noise reduction gain, comprising:
- determining a maximum frequency from a plurality of frequency-domain audio signals that are converted from a plurality of time-domain audio signals according to a frequency that allows the noise reduction gain to be greater than a predetermined threshold;
- and
- selecting the set of time-domain filter coefficients from the plurality sets of predetermined time-domain filter coefficients according to the maximum frequency, wherein the plurality set of predetermined time-domain filter coefficients have cut-off frequencies;
- and among the plurality sets of predetermined time-domain filter coefficients, the selected set of time-domain filter coefficients has a cut-off frequency that is closest to the maximum frequency;
- and
- configuring a time-domain filter according to the selected set of time-domain filter coefficients, and filtering the time-domain audio signal with the time-domain filter.
6 more elements
An audio processing apparatus, comprising:
- a Fourier transform circuit, arranged to convert a time-domain audio signal into a frequency-domain audio signal;
- a noise analysis circuit, coupled to the Fourier transform circuit, arranged to determine a noise reduction gain according to the frequency-domain audio signal;
- a filter coefficient storage circuit, arranged to store a plurality set of predetermined time-domain filter coefficients;
- a filter coefficient selection circuit, coupled to the noise analysis circuit and the filter coefficient storage circuit, arranged to select a set of time-domain filter coefficients from the plurality sets of predetermined time-domain filter coefficients according to the noise reduction gain;
- a frequency determination circuit, coupled to the noise reduction gain calculation circuit, arranged to determine a maximum frequency from a plurality of frequency-domain audio signals that are converted from a plurality of time-domain audio signals according to a frequency that allows the noise reduction gain to be greater than a predetermined threshold, wherein the filter coefficient selection circuit is arranged to select the set of time-domain filter coefficients from the plurality sets of predetermined time-domain filter coefficients according to the maximum frequency, and the plurality set of predetermined time-domain filter coefficients have cut-off frequencies;
- among the plurality sets of predetermined time-domain filter coefficients, the selected set of time-domain filter coefficients has a cut-off frequency that is closest to the maximum frequency;
- and
- a time-domain filter, coupled to the filter coefficient selection circuit, controllable by the selected set of time-domain filter coefficients, and arranged to filter the time-domain audio signal.
5 more elements
Dependencies are inferred from the claim text.