In other words, the "inverse" transform (from scalogram to sound) is just simple addition. The formulae I list are much simpler and carry out a similar analysis more directly and have the added advantage that the individual components in the scalogram are also bona fide sound components (since the phase is there, too) so that the total sound would actually be the sum of the component sounds. There is a method, tuned specifically for wavelet-based scalograms, called "synchrosqueezing" that does the scalaographic analogue of reassignment. One possibility may be to experiment with the formulae I provide in the description part of this demonstration video.
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Since you're writing your own software you may try to directly implement methods for reassignment either for spectrograms or scalograms and use that as the intermediate step in your analysis. The Loris package is one package that I'm aware of that provides a set of routines include those for estimating instantaneous frequencies. A similar consideration also applies to scalograms - which differ from spectrograms in that they are on a logarithmic scale for frequency, rather than on a linear scale. The result is a greater concentration of the spectrum onto chirp lines. The missing piece in the puzzle is that of making effective use of the phase part of a spectrogram to reassign the frequencies in the spectrum to their more natural positions (the "instantaneous frequencies" in the spectrum). I can't provide you with a software solution, but can address the underlying issue: which is that of recognizing the "natural" tones in an arbitrary source. oct factor to the octave removal, where the power is modified as psub-f factor to the average, where the power is modified as That is, for n, (i-n.,i.,i+n) are averaged
psub-n number of averaging bins in one side. Unit is half-note, that is, +1 is half-note up,Īnd -0.5 is quater-note down. a -adjust adjust-pitch param, which is suggested by WaoN after analysis. b -bottom bottom note (default: 28 = E1) (default: 128 = no peak-search = search only first on-event) k -peak peak threshold for note-on, which ranges = absolute cutoff with the value in -c option) r -relative log10 of cut-off ratio relative to the average. c -cutoff log10 of cut-off ratio to scale velocity of note nophase don't use phase diff to improve freq estimation. s -shift shift number from WAV in 1 step n sampling number from WAV in 1 step (default: 2048) Options -i and -o have argument '-' as stdin/stdout o -output output mid file (default: 'output.mid') i -input input wav file (default: stdin) That is, a converter from sound file to midi file. WaoN - a Wave-to-Notes transcriber, Version 0.10 Here the summary of options the excutable provides./waon -help I converted the CVS-based history to git and re-hosted it on. Where to find source codeĬVS is dated and sourceforge is phasing out. WaoN is released under the GNU General Public License. Pv: phase vocoder for time-streching and pitch-shifting Intention is to pick up voicing of harmony from sound of my favoriteĬurrently, WaoN contains three programs: waon: transcriber (wav-to-mid converter) WaoN is a Wave-to-Notes transcriber, that is, the inverse of timidityīy Tuukka Toivonen (and its descendants timidity++). There are also some WAV editors that support CAF audio.Originally on I had it compile on Xubuntu 18.04, including gtk-based gui.
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If you don’t have an Apple device, you can open CAF files for free with VLC Media Player or Audacity. It uses the lossy compression algorithm to contain audio data. MP3 Converter MP3 MP3 is an audio format that can compress and encode an audio file. CAF files can store beside audio additional data such as text annotations, markers and other metadata.
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If you’re using an Apple device, you can open CAF files using the free Apple QuickTime Player and GarageBand apps, or the paid Final Cut Pro and Logic Pro apps. CAF The Core Audio Format is a audio container format, developed by Apple. CAF files can also store different audio formats, not just one type like MP3, and can have multiple audio channels.ĬAF is an Apple proprietary format, and it’s designed specifically for devices using iOS and OS X. However, WAV files have a size limit of 4GB, while CAF files don’t have this limit, meaning they can contain audio data with longer playback durations. This makes CAF similar to the WAV format. As well as audio, CAF files can contain metadata like text annotations, markers and channel layouts. The CAF format is a type of audio file developed by Apple, and the name is short for Core Audio File.
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