Wavelets are a special case of a filterbank. There’s no sinusoidal modeling in them, so no sweep or ramp rate.
On Monday, September 6, 2021, Zhiguang Zhang <[email protected]> wrote: > I'm no expert on wavelets but does what you mention approach some of the > parameters of wavelets i.e. sweep rate and ramp rate? I know they can be > useful for decomposing non-stationary signals. Also it seems strange to > hear of 'other' parameters within phase vocoder (DFT/FFT) sinusoidal > components but perhaps that's just what was taught in school > > > Zhiguang > > On Mon, Sep 6, 2021, 1:46 PM robert bristow-johnson < > [email protected]> wrote: > >> i think i referenced a paper from Masri in my paper. and another from >> Peeters and Rodet. i can't remember but there was some difference. i >> think the other guys were doing sinusoidal modeling and i was doing a >> modified phase vocoder. >> >> perhaps the common point we had is that every sinusoidal component can >> have more than amplitude, frequency, and phase in its representation. it >> can also have the frequency sweep rate and amplitude ramp rate put into its >> description. >> >> i remember revisiting this gaussian-windowed chirp thing at Stack >> Exchange. >> >> https://dsp.stackexchange.com/questions/24191/stft- >> multiplied-with-gaussian-window-vs-stft-multiplied-by- >> rectangular-window/36797#36797 >> >> https://dsp.stackexchange.com/questions/48876/does-a-chirp- >> like-generalization-of-the-gabor-or-morlet-wavelets-definitions-e >> >> -- >> >> r b-j . _ . _ . _ . _ [email protected] >> >> "Imagination is more important than knowledge." >> >> >> > On 09/06/2021 1:14 PM STEFFAN DIEDRICHSEN <0000009333a9e91c-dmarc- >> [email protected]> wrote: >> > >> > >> > I think it’s kind of limited by the correct measurement of the >> amplitude and/or frequency modulation. There was some work in the late >> 90’s, I remember a paper from Paul Masri investigating options to measure >> those parameters. >> > >> > Best, >> > >> > Steffan >> > >> > >> > >> > > On 05.09.2021|KW35, at 04:29, robert bristow-johnson < >> [email protected]> wrote: >> > > >> > > >> > > https://ieeexplore.ieee.org/document/969581 >> > > >> > > https://www.researchgate.net/publication/3927319_ >> Intraframe_time-scaling_of_nonstationary_sinusoids_ >> within_the_phase_vocoder (https://www.researchgate.net/ >> publication/3927319_Intraframe_time-scaling_of_ >> nonstationary_sinusoi%20ds_within_the_phase_vocoder) >> > > >> > > I still like the idea but it turned out to make little difference >> audibly. >> > > >> > > -- >> > > >> > >> >> . >> . >> . >> >
