Re: [SoX-users] vol effect inverts phase acc. to man pages - how to revert that back?

[Klaus S. <kls...@go...>]

On Thu, Apr 15, 2010 at 10:51 AM, Pavel Hofman <pav...@iv...>wrote:

> Klaus Schulz napsal(a):
> >
> > vol also works in db.  Have a look at the man pages.
>
> Yes, but you have to explicitly give the type of the value, i.e. "db".
> Please read the man page carefully.
>
> Does this mean vol
> > will change phase on linear and it won't on db according to your above
> > logic.
>
> Linear notation can provide negative numbers for volume calculation,
> leading to phase change. Decibel notation cannot, negative decibels
> stand for attenuation.
>
>

It depends. You could change that linear phase shift behavior in vol if you
disregard the
sign for the multiplication and convert  +10% to 1,1 and -10% to 0,9
This way you'd end up as done when calculating db with no phase shift.

There wouldn't be an inconsistency any longer and no accidental phase shift
would occor.





> >
> > Then the man page needs to be updated. It is pretty confusing. It took
> > me a while to realize this behavior at all.
> >
>
> Your patch will be certainly welcome if appropriate.
>
> Regards,
>
> Pavel.
>
>
>
>
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