Help for Tune Smithy
From Tune Smithy
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Latest revision as of 14:18, 2 November 2008
Frequency Spectrum Peaks Pitch Detection
Find notes in clean recording - use other programs to clean them first...
The dection of notes is easily confused by background noise or low or high frequency sound.
So to improve the accuracy of the results, first use a sound editor to do a band pass or high pass to remove all frequencies outside the range of interest. Also do a noise reduction.
You could for example use Goldwave.
The count waves method is easily confused by low background noise such as traffic hum, and also by high fequency noise adding extra wave crossings. It can also be confused by any background noise as it can find regular patterns in noise not corresponding to any heard pitch.
The frequency spectrum method is less easily confused but background noise can add extra partials or lead it to detecting a pitch in the noise as the fundamental of the note to detect.
Both methods are programmed for solo recordings, withthe emphasis on high resolution pitch detection of the notes.
Any polyphony is just treated as noise and confuses the method.
Sometimes you can remove other instruments from a polyphonic recording to some degree using bandpass, most likely to be successful with instruments with few higher partials such as bird song and whistle, flute, recorder etc. If successful there, one might then in some cases be able to transcribe each part individually in Tune Smithy and then combine the result.
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