Castle Patching 001: Digitizing Luma Video Sources

castle
adc
dac
patch-tutorial

#1

At the end of this exercise you should be able to digitize a video source and create a posterize effect. The first piece of gear I saw posterize on was on my first video mixer, the Panasonic MX-10, it had a rotary switch that you could use to select how many ‘slices’ of Posterizing you would have. You can do the same with this patch by removing any of the Data outputs from the DAC. Tools needed for this exercise are: Castle ADC, Castle DAC, and a video source.

First take your luma video source, I’ve used a simple ramp shape from the Visual Cortex H+V output, but you can use any video source. Take your video source and input it into the Castle ADC. Patch from ADC outputs D0-D2 to the DAC D0-D2 inputs, and from the DAC output to your video output. The Gain control on the ADC goes from non-inverted on the left through zero to inverted on the right. Set the gain to around 9 o’clock. Adjust the Bias control on the ADC until you can see 8 discrete levels including black. This patch constitutes the basic input and output of the Castle system.

Patch output:


DIY Questions:)
#2

Awesome post, thank you! Here’s my take on the patch with an additional trip through Staircase after coming out of the DAC.
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#3