Re: [Audacity-quality] Issues around Equalization in Graphic EQ mode

[Bill W. <bi...@go...>]

On 19/03/2013, at 1:02 PM, Steve the Fiddle <ste...@gm...> wrote:

> [snip]
> 
> Bill wrote:
>> I don't understand why, when switching between modes
>> for a pre-set (or any) curve, Equalization can't display
>> the "possible" curve in each mode. Why does it have to
>> "stick with" the Graphic EQ version of the curve once that
>> curve has been displayed?
> 
> This is an interesting question that I have been pondering myself.
> 
> The seemingly obvious answer to "what we would like" is that:
> * When changing from "Draw" to "Graphic", if the curve cannot be
> displayed exactly, the graphic "interprets" the settings as closely as
> possible,
> * When changing back from "Graphic" to "Draw", return to the "Draw" view.
> 
> The problem with this scheme is; what if we move a slider while in
> Graphic mode? The curve must now be one that is compatible with the
> Graphic interface, so when we change back to Draw mode, what should be
> displayed? Do we abandon the changes that were made in Graphic mode,
> or do we now reproduce the "Graphic mode" curve within the Draw
> interface? I think that we must do the latter, which is basically what
> Audacity 2.0.0 seems to achieve reasonably successfully.

If the preset retained its name when switching from Draw to Graphic mode, then switching back to Draw mode could recalculate the curve. If a slider is moved in Graphic mode, then the curve becomes "unnamed", and when switching to Draw mode the "unnamed" curve must be maintained.

-- Bill

> 
> I would expect that any curve generated in Graphic mode can be
> reproduced exactly in Draw mode (though with the necessity of a lot of
> control points). Again, Audacity 2.0.0 seems to do this quite
> successfully. So if the curve is reproduced exactly in Draw mode, then
> changing back to Graphic mode *should* be lossless. Here lies the
> problem with Audacity 2.0.3 - when changing back from Draw mode to
> Graphic mode the settings are changed, even if the curve was
> originated in graphic mode. In some cases the "conversion" from Draw
> mode to Graphic mode seems to be way off "best fit".
> 
> Steve
> 
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