Re: [SoX-users] Newbie questions: recording win32

[Chris B. <ch...@cn...>]

Andreas Mock wrote:
> Is there a way to do something like VU meter? I want to adjust the
> microphone volume so that no clipping occurs. Is there something?
> Can I interpret raw-format for that like 'rec -c 1 -t raw | vuscript'?
>
>   
A VU meter is kinda  a cool idea but I've never seen another command 
line app implement it.

It wouldn't be to hard to implement inside of SoX but you'd lose the 
current status you get during recording.  The VU would have to fit on 1 
line to work to erase previous date.  A seperate program like you 
mention is probably a better idea.

Anyways, what your probably looking for is just the maximum value you 
received over some range of audio.

I haven't tried this but it should work:  rec -n stat

Run that and after you've finished playing your loudest audio, type 
ctrl-c.  It should print out information about your audio including how 
much clipping occured.  There is "Volume adjustment" field printed.  The 
thats 1.0 or less then you've pegged your VU meter.  You can adjust 
recording volume until you see that value greater then 1.0 which means 
you've never clipped.

Its not as useful as a VU meter though since we all don't mind a small 
amount of clipping if its just a one time burst.

Chris