Multiband phase-vocoder for the modification of audio or speech signals
AssigneeCreative Technology Ltd
InventorJean Laroche
Life of this patent
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Abstract
A method and apparatus to inexpensively and efficiently process audio and speech signals. A method for processing a signal having at least one region of interest is provided. The method begins by dividing the signal into a plurality of sub-band signals, wherein a selected sub-band signal includes the region of interest. The selected sub-band is processed by a phase vocoder to produce a vocoder output signal. Next, at least a portion of the subbands are time-aligned with the vocoder output signal. Finally, the aligned sub-band signals and the vocoder output signal are combined to form an output signal.
Claims11
A method for processing an input signal, the method comprising
- dividing the input signal into at least first and second sub-band signals;
- applying a Fourier transform operation to the first sub-band signal to obtain a first resulting signal;
- applying a time-domain processing operation to the second sub-band signal to obtain a second resulting signal, wherein the second sub-band signal is not subjected to a Fourier transform operation;
- and
- combining the first and second resulting signals into an output signal.
An apparatus for processing an input signal, the apparatus comprising
- a plurality of filter banks for dividing the input signal into at least first and second sub-band signals;
- circuitry for applying a Fourier transform operation to the first sub-band signal to obtain a first resulting signal;
- a data path for applying a time-domain processing operation to the second sub-band signal to obtain a second resulting signal, wherein the second sub-band signal is not subjected to a Fourier transform operation;
- and
- a recombiner for combining the first and second resulting signals.
Dependencies are inferred from the claim text.