What's the difference?
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Featherless biped Featherless biped https://www.kvraudio.com/forum/memberlist.php?mode=viewprofile&u=698984
- KVRist
- Topic Starter
- 38 posts since 7 Apr, 2024
Strangely there's a difference between the outputs of the following two projects:
Case1 has an extra multiplication by 1, why does that matter? Something to do with execution order?
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- KVRist
- 493 posts since 21 Nov, 2012 from Sitting in front of my PC
I can't quite work out the math but I can see whats happening.
When the oscillator pitch exceeds 5.0v the circuit is adding a DC offset of -5.0v (shown as -0.5 on the scope).
When it's ready to redraw the window the scope fills its buffer for each trace when it detects a zero volt rising. That is when the previous sample is <= 0.0f and the current sample is > 0.0f.
Because scope A is getting the -0.5f DC offset it never triggers and so you see the contents of the last trigged buffer displayed as a static image.
If you add a positive DC offset (either a constant 5.0v or a scaled connection from the pitch parameter) directly to the scope A trace it fixes it. But at very high frequencys the filters 45deg phase offset might come into play.
Kirsty
When the oscillator pitch exceeds 5.0v the circuit is adding a DC offset of -5.0v (shown as -0.5 on the scope).
When it's ready to redraw the window the scope fills its buffer for each trace when it detects a zero volt rising. That is when the previous sample is <= 0.0f and the current sample is > 0.0f.
Because scope A is getting the -0.5f DC offset it never triggers and so you see the contents of the last trigged buffer displayed as a static image.
If you add a positive DC offset (either a constant 5.0v or a scaled connection from the pitch parameter) directly to the scope A trace it fixes it. But at very high frequencys the filters 45deg phase offset might come into play.
Kirsty
