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How to go from sound analysis to sound synthesis?

Started by Unknown August 22, 2005
Hi, Everyone!

If I have analyzed a sound and have its spectrogram, how can I utilize
that information for sound synthesis?

Thank You Very Much.

Truly Yours, Simon Dexter

simondex@yahoo.com skrev:
> Hi, Everyone! > > If I have analyzed a sound and have its spectrogram, how can I utilize > that information for sound synthesis?
By computing the average spectrum and compute the Inverse Fourier Transform? This is an impossible question to answer, unless you provide some more information: - Do you have power spectrograms or magnitude/phase spectrograms? Some times you ned the phase of the spectrum. - Are the data stationary or are they transients? Stationary data can to some extent be synthesized from spectra, transients can be difficult. - What is the application you have in mind? The constraints imposed by the appliications can completely govern what DSP methods can be considered. What can be used in off-line processing need not be suitable for on-line processing. Rune
<simondex@yahoo.com> wrote in message 
news:1124718668.266876.253260@g47g2000cwa.googlegroups.com...
> Hi, Everyone! > > If I have analyzed a sound and have its spectrogram, how can I utilize > that information for sound synthesis? > > Thank You Very Much. > > Truly Yours, Simon Dexter >
Simon, Doing what you want can be very challenging. Here are some of the reasons: - you may need to know the analysis bandwidth / resolution that will be applied to the synthesized sound. That's because you need the record to be long enough to not end up with a synthesized sound that is made up of "lines" while the original was more continuous. - you need to know what part of the spectrum is really broadband noise so that it can be replicated adequately. Take a look at speech synthesis. There's a huge body of literature. The objective there was to compress speech and re-create it. So, there's a short-term aspect to the methods - in contrast to the issue I mention above. Fred