issue27

EMUSIC-L Digest                                      Volume 58, Issue 27

This issue's topics:
	
	sound-to-image (3 messages)

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Date:         Mon, 8 Nov 1993 10:38:10 -0500
From:         Marty Hicks 
Subject:      sound-to-image

Excuse me for just jumping in (I sent this to EMUSIC-D but my message returned
unsent). My interest is in finding or writing an algorithm that will change a
sound file into an image file. I work on a Mac. Any ideas or leads?

Marty

(martyh@pantry.mcad.edu)

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Date:         Mon, 8 Nov 1993 11:52:18 -0600
From:         Arne Claassen ISE 
Subject:      Re: sound-to-image

> Excuse me for just jumping in (I sent this to EMUSIC-D but my message returned
> unsent). My interest is in finding or writing an algorithm that will change a
> sound file into an image file. I work on a Mac. Any ideas or leads?

First, assumption: You are trying to get a image representation of the digital
data of a sound, not trying to display the waveform.

I don't really know of a program although it sounds like an interesting idea,
such as using the timeline as x and the frequency the color depth. The lacks
y, so just do a sort of datawrap at the end of each line. This method would
lack any logical consistency in the y-axis, while it would represent the
flor of data in the x-axis. Anyone got a better idea of transforming it into
x, y and color depth.

One simple way to force it into a picture might be using something like
Photoshop and taking the raw data and loading it as "raw" format picture
and see what Photoshop does with it.
--
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|Arne F. Claassen                            |
|                                                     |
| "It is by my will alone I set my mind in motion"                       |
|                                             finger for PGP public key  |
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.

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Date:         Tue, 9 Nov 1993 13:27:02 GMT
From:         Andy Farnell 
Subject:      Re: sound-to-image

> My interest is in finding or writing an algorithm that will change a
> sound file into an image file. I work on a Mac. Any ideas or leads?
> Marty
> (martyh@pantry.mcad.edu)

The most obvious thing that comes to mind is a spectrogram, I have seen some
nice colour ones created in real time on a 486 using a TMS320 dsp board but
it may well be possible to do something quite good on a Mac.
Spectrograms are nice because there is an obvious mapping between sound and
image but I suppose it depends on what you are trying to do, What about time
plots (ie oscilloscope type patterns) or 3D spectral plots ?

andy farnell
computing and cognition
bournemouth university

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