Nov 13 2014

Filter CHOP tutorial.

The filter CHOP. TouchDesigner 088. 2014.
The Filter CHOP can help you smooth, affect, or otherwise adjust incoming channel data.

1
00:00:00,567 –> 00:00:03,900
Let’s take a look at the filter
CHOP.

2
00:00:03,900 –> 00:00:10,000
The filter CHOP can smooth, or
sharpen, the incoming chop data.

3
00:00:10,000 –> 00:00:22,533
This sample network merges
unfiltered and filtered CHOP
data, so you can easily
visualize a side-by-side
comparison.

4
00:00:22,533 –> 00:00:33,533
The filter CHOP has 2 very
important parameters, the
“Effect” and “Filter Width”
parameters.

5
00:00:33,533 –> 00:00:36,567
We start with a noise CHOP.

6
00:00:36,567 –> 00:00:44,533
We can create different types of
animating noise, and see the
effects of filtering.

7
00:00:44,533 –> 00:00:50,133
The merge CHOP combines the
filtered and unfiltered data.

8
00:00:50,133 –> 00:00:54,467
The yellow line is the raw data.

9
00:00:54,467 –> 00:01:03,500
I’ll right click on the merge
CHOP, and choose “View” from the
pop-up menu.

10
00:01:03,500 –> 00:01:14,533
This is one of several methods
you can use to simultaneously
monitor different regions of the
Touch Designer workspace.

11
00:01:14,533 –> 00:01:19,767
I’ll adjust some of the noise
CHOP’s parameters.

12
00:01:19,767 –> 00:01:29,533
There are 7 types of filters,
and it is worth investigating
the effects each has on incoming
data.

13
00:01:29,533 –> 00:01:36,967
Some filter and width
combinations introduce more
delay than others.

14
00:01:36,967 –> 00:01:43,967
An “Effect” setting of zero
eliminates filter processing
altogether.

15
00:01:43,967 –> 00:01:55,433
Increasing the “Filter Width”
parameter causes more of the
surrounding sample range to be
included in the filter
calculation.

16
00:01:55,433 –> 00:02:05,133
Each application of the filter
chop may require a different
fine tuning of filter types and
parameters.

17
00:02:05,133 –> 00:02:15,900
Some applications may be
extremely accuracy or time
sensitive, while others may not.

18
00:02:15,900 –> 00:02:23,767
You can sharpen incoming data
that may be too smooth, to
create a greater value range.

19
00:02:23,767 –> 00:02:30,467
You can also de-spike incoming
data such as harsh audio spikes.

20
00:02:30,467 –> 00:02:32,467
The filter CHOP is very
powerful, and almost always
requires fine tuning based on
the specific application.

Posted In
Tagged