Method and apparatus to eliminate discontinuities in adaptively filtered signals
AssigneeBroadcom Corporation
InventorsJes Thyssen, Chris C Lee, Juin-Hwey Chen
Life of this patent
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Abstract
A method to eliminate discontinuities in an adaptively filtered signal includes filtering a beginning portion of a current signal frame using a past set of filter coefficients, thereby producing a first filtered frame portion. The method also includes filtering the beginning portion of the current signal frame using a current set of filter coefficients, thereby producing a second filtered frame portion. The method also includes modifying the second filtered frame portion with the first filtered frame portion so as to smooth a possible filtered signal discontinuity between the second filtered frame portion and a past filtered frame produced using the past filter coefficients.
Claims25
A method of filtering an audio signal, the audio signal including successive signal frames, comprising:
- (a) filtering a beginning portion of a current signal frame using a past set of filter coefficients, thereby producing a first filtered frame portion;
- (b) filtering the beginning portion of the current signal frame using a current set of filter coefficients, thereby producing a second filtered frame portion;
- and
- (c) modifying the second filtered frame portion with the first filtered frame portion so as to smooth a possible filtered signal discontinuity between the second filtered frame portion and a past filtered frame produced using the past filter coefficients.
A computer program product (CPP) comprising a computer usable medium having computer readable program code (CRPC) means embodied in the medium for causing an application program to execute on a computer processor to filter an audio signal, the audio signal including successive signal frames, comprising:
- first CRPC means for causing the processor to filter a beginning portion of a current signal frame using a past set of filter coefficients, thereby producing a first filtered frame portion;
- second CRPC means for causing the processor to filter the beginning portion of the current signal frame using a current set of filter coefficients, thereby producing a second filtered frame portion;
- and
- third CRPC means for causing the processor to modify the second filtered frame portion with the first filtered frame portion so as to smooth a possible filtered signal discontinuity between the second filtered frame portion and a past filtered frame produced using the past filter coefficients.
An apparatus for filtering an audio signal, the audio signal including successive signal frames, comprising:
- first means for filtering a beginning portion of a current signal frame using a past set of filter coefficients, thereby producing a first filtered frame portion;
- second means for filtering the beginning portion of the current signal frame using a current set of filter coefficients, thereby producing a second filtered frame portion;
- and
- third means for modifying the second filtered frame portion with the first filtered frame portion so as to smooth a possible filtered signal discontinuity between the second filtered frame portion and a past filtered frame produced using the past filter coefficients.
Dependencies are inferred from the claim text.