Generating (time, amplitude) data table using sound samples

[princee]

   
How do I return the points of every nth sample in a .wav file?

I want to export the amplitude of each sample with respect to time into a file.
Note that my sound files are only 1 second long, so I don't think the data processing will be too difficult. Thus, I think that the n in "every nth" is 1.

See the below picture for clarification:



Also, if possible, how can I create a best fit curve — preferably in the form

Code: Select all

a * sin(bx + c) + d

for a selection of sound samples?

Thanks!

[steve]

How about "Sample Data Export"?
http://manual.audacityteam.org/o/man/sa ... xport.html

[Robert J. H.]

How about "Sample Data Export"?
http://manual.audacityteam.org/o/man/sa ... xport.html

Since you want only each nth sample, you could preprocess the audio.

1. open the nyquist prompt

2. Code: Select all

   (snd-avg s 1 <nth sample> op-average)

   --> OK
3. Change the sample rate in the track dropdown menu (Set Rate --> Other)

The last point is optional but it assures the right time indexing.
The new sample rate is

Code: Select all

old sample rate / nth sample

The code is meant to work with mono tracks, don't enter < and >, just the number.