Gale Andrews wrote:
> | From Martyn Shaw <martynshaw99 googlemail.com>
> | Fri, 04 Jan 2008 23:44:59 +0000
> | Subject: [Audacity-devel] Tone Generation single
sample clipping
>> James Crook wrote:
>>> Me too.
>>>
>>> I think now would be a good time to change the
default amplitude for
>>> tone, chirp and DTMF to 0.8.
>> I think you'll find that they already are.
>
> Not all of them were at the time - the ones that were
defaulted to 1.0
> were changed between the time James wrote that and you
replied to it
> (i.e. now).
Apologies - I missed that one. I see James changed Noise
and DTMF
back on 22/12/7 (while I was on holiday).
>> Gale is deliberately making clipped waveforms here.
>
> Actually I just had the temerity to create a tone at
the then default
> amplitude Audacity offered (1.0), and to have Show
Clipping on (AKA
> "testing").
As I said, deliberately making clipped (just clipped,
arguably)
waveforms. Tone and Chirp have had defaults at 0.8 since
chirp was
committed by James on 10/8/6.
Testing is good. Clipping being shown is good. Testing
that clipping
is shown is good.
> It is a problem for a user who does not know the
reason why
> the entire waveform of a tone should display solid
red. And if Show
> Clipping worked on a run of three consecutive clipped
samples as the
> meters do, and as Find Clipping defaults to, it would
not happen
> anyway.
It would still happen on square waves, and a.n.user would
learn that
clipping isn't a good thing.
> While I've got you, would you like to cast an eye over
our Manual page
> for Equalization:
> http://www.audacityteam.org/manual/index.php?titl
e=Equalization
>
> for technical accuracy and anything missing that should
be said.
It's pretty good, I would say. Did you write it?
Just a few comments for now:
Perhaps in the first Example one should click the 'Flat'
button first.
When switching from 'Draw curves' to 'Graphic EQ' mode, the
Equalizer
does it's best to adjust the slider positions to give the
closest
match to the drawing that you had. It generally can't match
it
perfectly, which is why it switches to 'custom'.
When switching from the 'Graphic EQ' to 'Draw curves' mode,
the
Equalizer does it's best to reduce the number of control
points to
still give about the same curve ('Graphic EQ' uses lots of
points,
internally, and those will appear in EQCurves.xml if you
save a
curve). If you had saved the curve in 'Graphic EQ' mode this
generally
means that it will switch to 'custom'.
If you Load a curve saved in 'Graphic EQ' mode when you are
in
'Draw curves' mode, you will see the many points used
internally in
the 'Graphic EQ' mode.
> Also when I went over the equalizer I noticed that even
in Draw
> Curves Mode, if you close Audacity with a named curve
such as RIAA
> last shown in the EQ window, when you open EQ after the
restart the
> RIAA curve is shown in the Select Curve box as
"Custom". Can that be
> corrected or is there a technical reason it should do
that?
I'll have a think about that. There are other things that
aren't
quite right also, but all the while nobody has noticed I
figure we are ok!
Martyn
> Thanks
>
>
> Gale
>
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