Repair vs. Silence or Draw Tool

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Ctrl+N
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Repair vs. Silence or Draw Tool

Post by Ctrl+N » Mon Mar 29, 2010 5:57 pm

I found the draw tool difficult to draw a straight line or a smooth curve. Instead of silence, I would sometimes use Hard Limit to draw a straight line above of below zero. And zero was hard to find on Audacity 1.2. The techniques I am discussing are obsolete in Audacity 1.3, largely due to Repair.

Draw would work better if one could use Splines and Lines instead of manipulating individual samples. The only thing that I could use draw for was to interpolate a single sample, at for instance the join where I copy and paste.

So interpolation is the main point of Draw, but one cannot do it smoothly enough. There is another tool that will interpolate for you.

If a click is in the middle of a held note, the waveform on each side will be similar. At first I would try to draw a matching wave. Then I started to copypaste the wave on either side to match the pattern. Draw would be used to interpolate at the joins.
Most discrete clicks up to five milliseconds long can actually be simply silenced without leaving an audible gap in the sound, although many spread wider that that. If the click is not suitable for silencing, try using the Draw Tool by clicking the pencil icon top left of the Audacity screen, or press F3 on your keyboard.
I discovered that silencing the click can cause a click of its own. Maybe I wasn't following the five millisecond rule.
Right after this is instructions on how to turn the draw tool into a brush. I missed that part. That would have helped with my complaint that I can't draw smoothly enough.

But now repair can do both these things more smoothly and easily.

kozikowski
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Re: Repair vs. Silence or Draw Tool

Post by kozikowski » Mon Mar 29, 2010 9:08 pm

<<<Draw would work better if one could use Splines and Lines instead of manipulating individual samples.>>>

I remember a very old Audacity posting about that. If you change the brightness using curves in Photoshop, you choose one point and Pshop will redraw the entire curve to what the scene would look like if the physical lights in the scene actually did that.

http://www.kozco.com/tech/day_for_night.html

That was six clicks in Photoshop, counting menu navigation. I didn't have to take each of 255 brightness points and move it individually to a new value.

Here's another one. This should have been two or three clicks...

http://kozco.com/tech/audacity/100Hz_Rumble.jpg

Not 11.

Koz

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Re: Repair vs. Silence or Draw Tool

Post by Ctrl+N » Tue Mar 30, 2010 2:50 pm

I assume that in audio a smooth curve can be defined as the sine wave. A classic bézier curve from drawing programs and font technology is perhaps not appropriate for audio? The word bezier shouldn't be flagged as a spelling error.

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Re: Repair vs. Silence or Draw Tool

Post by steve » Wed Mar 31, 2010 7:59 pm

Ctrl+N wrote:A classic bézier curve from drawing programs and font technology is perhaps not appropriate for audio?
It depends what you are doing. I use Bézier curves in my "custom fade" plug-in and they work great.
Ctrl+N wrote:The word bezier shouldn't be flagged as a spelling error.
Should be upper case "B" - it's a name. Bézier
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