Method and device for low delay processing
First Claim
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1. A method of adaptively processing an input signal, the method comprising:
- passing the input signal through an adaptive warped time domain filter to produce an output signal;
taking at least one of the input signal and the output signal as an analysis signal;
transforming the analysis signal into a warped frequency domain to produce a transformed analysis signal;
analyzing the transformed analysis signal to produce a plurality of desired gains each corresponding to a respective warped frequency domain sub-band;
synthesising a minimum phase warped time domain filter characteristic which approaches the desired gains; and
updating the adaptive warped filter with the synthesised filter characteristic.
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Abstract
Adaptively processing an input signal, such as an input signal of a hearing aid. The input signal is passed through an adaptive time domain filter to produce an output signal. At least one of the input signal and the output signal is used as an analysis signal. The analysis signal is transformed into a transform domain to produce a transformed analysis signal, which is analyzed to produce a desired gain for each respective transform domain sub-band. A minimum phase time domain filter characteristic is synthesized which approaches the desired gains. The adaptive filter is updated with the synthesized filter characteristic.
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Citations
23 Claims
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1. A method of adaptively processing an input signal, the method comprising:
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passing the input signal through an adaptive warped time domain filter to produce an output signal; taking at least one of the input signal and the output signal as an analysis signal; transforming the analysis signal into a warped frequency domain to produce a transformed analysis signal; analyzing the transformed analysis signal to produce a plurality of desired gains each corresponding to a respective warped frequency domain sub-band; synthesising a minimum phase warped time domain filter characteristic which approaches the desired gains; and updating the adaptive warped filter with the synthesised filter characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A computer program stored instructions for adaptively processing an input signal, the computer program comprising:
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code for passing the input signal through an adaptive warped time domain filter to produce an output signal; code for taking at least one of the input signal and the output signal as an analysis signal; code for transforming the analysis signal into a warped frequency domain to produce a transformed analysis signal; code for analyzing the transformed analysis signal to produce a plurality of desired gains each corresponding to a respective warped frequency domain sub-band; code for synthesising a minimum phase warped time domain filter characteristic which approaches the desired gains; and code for updating the adaptive warped filter with the synthesised filter characteristic.
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23. A device for adaptively processing an input signal, the device comprising:
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an adaptive warped time domain filter for producing an output signal from an input signal; a transform block for taking an analysis signal from at least one of the input signal and the output signal, and for transforming the analysis signal into a warped frequency domain to produce a transformed analysis signal; a processor for analyzing the transformed analysis signal to produce a plurality of desired gains each corresponding to a respective warped frequency domain sub-band; a filter synthesiser for synthesising a minimum phase warped time domain filter characteristic which approaches the desired gains, and for updating the adaptive warped filter with the synthesised filter characteristic.
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Specification