Re: [SoX-users] stat with the -freq option (was: Sox-users Digest, Vol 63, Issue 9)

[Thor A. <ta...@to...>]

On Thu, Sep 22, 2011 at 05:56:28AM +0530, Nilesh Deshpande wrote:
> Ok let me ask the question this way.
> I ran the following command
> sox d:\voice\hansini1.wav -n stat -s 1 -freq
> and i got the output as under

[...]

> I am wondering what are those values in the two columns of the
> columnar output? 

Column one is frequency, and the second column shows the energy at that
frequency in the current 4096 data chunk.

[...]

> Isn't that a measure of something in the sound file at that particular
> moment of time? 

No, time resolution is in steps of 4096, see below.

[...]

IIUC, what the -freq option does is to run a DFT on the signal at 4096
sample intervals, so sort of a time/frequency output, but without
overlapping and windowing. I would not use this for frequency analysis.

-- 
best regards
Thor Andreassen