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Theory of everything swooping on Gamakas

Ideas and innovations in Indian classical music
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shankarank
Posts: 943
Joined: 15 Jun 2009, 07:16

Theory of everything swooping on Gamakas

Post by shankarank » 19 Mar 2017, 10:35

https://sciencefriday.com/segments/visu ... f-vibrato/

Given that the vibrato can be visualized - not too far off before somebody tries it on Gamakas.

There is this free program : http://ab-initio.mit.edu/wiki/index.php/Harminv that talks about similar technique - not sure if this has been tried anywhere.

uday_shankar
Posts: 1201
Joined: 03 Feb 2010, 08:37

Re: Theory of everything swooping on Gamakas

Post by uday_shankar » 26 Mar 2017, 18:36

shankarank wrote:
19 Mar 2017, 10:35
Given that the vibrato can be visualized -
This is not so useful unless it can close the loop with psychoacoustics and perception. Pulling out low frequencies from a signal is a 2 minute job with a LPF (low pass filter)...anaylzing them further for morphology is endless. In general this researcher, Elaine Chew, is a master (or mistress!) of useless BS.
shankarank wrote:
19 Mar 2017, 10:35
not too far off before somebody tries it on Gamakas.
A great start has been made in a series of excellent papers by Arvindh Krishnaswamy, then with CCRMA in Stanford more than a decade ago. Not just the shape or spectral content of gamakas but also how it relates to the overall psychoacoustic experience of sound and "intonation" (roughly, pitch perception).
shankarank wrote:
19 Mar 2017, 10:35
similar technique - not sure if this has been tried anywhere.
Not quite "similar" I think. This is just a more accurate method to extract spectral components of a signal than garden variety FFT (but thanks for the link, who knows when I might find it useful for something!).

The spectral components of sound itself and the vibrato or gamakam features imposed upon it differ by an order of magnitude. For non real-time processing I would do it in two parts 1) a good bandpass/lowpass filter to isolate the low frequencies (0-10Hz) and 2) then analyze shapes, etc...

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