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fixed a few typos in readme

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Max Egger
2021-12-21 19:34:37 +01:00
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README.md
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@@ -32,28 +32,28 @@ Power distribution to backbone modules and rack. +5V, GND, -5V.
This module takes any standard video signal as input and generates all necessary timing signals for the Synkie system. The input is first backporch-clamped to GND and all active video is cut off. This black image can serve as a genlock for connected sources (cameras). Colorburst is output as a seperate signal and used to syncronise a quartz crystal that generates a continuous 4.4336Mhz subcarrier signal for the rgb modules. A LM1881 generates the digital sync signals: horizontal sync, vertical sync, backporch and odd/even.
###sk002-input
### sk002-input
This modules takes any standard video signal, clamps black level to GND and strips off synctips and colorburst. (still in active debate: me thinks sk002 should apply a gain of 1.43 to bring the 0.7V white level up to 1V)
###sk003-output
### sk003-output
This module takes any signal as its input (from DC to 10Mhz). The scale-bias section controls amplitude and dc-shift. The signal is then clipped hard between 0V and 1V. Finally the resyncer adds synctips and colorburst to make it look loike a standard video signal.
This module takes any signal as its input (from DC to 10Mhz). The scale-bias section controls amplitude and dc-shift. The signal is then clipped hard between 0V and 1V. Finally the resyncer adds synctips and colorburst to make it look like a standard video signal.
When using video as an input to the sk003 any processing beforehand can add some tiny delay - depending on how many modules the signal passes through - which causes a phase shift in the signal that can alter or completely destroy color. That is why the burst signal from sk001 first goes through a sk004-burstshift (allpass filter) that lets correct the phase error before it gets cut back into the video signal.
##Synkie Signals
## Synkie Signals
###Terminology
### Terminology
| Signal name | Waveform| Description |Specs|
|---|---|---|---|
|Genlock|![](doc/genlock.svg)|A video signal that serves as the master syncronisation signal. Can be routed through and used as an input.|-0.3V to 0.7V|
|Genlock|![](doc/genlock.svg)|A video signal that serves as the master synchronisation signal. Can be routed through and used as an input.|-0.3V to 0.7V|
|Video|![](doc/video.svg)|Standard PAL video signal|-0.3V to 0.7V|
|Sync| ![](doc/sync.svg)|Digital sync pulses: H-Sync, V-Sync, Backporch, Odd/Even|0V to 5V|
|Burst|![](doc/burst.svg)| Colorburst only, AC coupled|ca. -0.1V to 0.1V|
|Siff| ![](doc/siff.svg)|Synkie signal. Can be anything, DC, CV, Audio or Video. 0V means black. 1V means white|-1V to 1V|
###The SIFF signal
Synkies goal is to be able to mix all signals, be it control signals, audio or picture. You should be able to use a video image as control voltage for a VCO like you should be able to inject a sound into the video or watch a steady 0.256 volts.
### The SIFF signal
Synkie's goal is to be able to mix all signals, be it control signals, audio or picture. You should be able to use a video image as control voltage for a VCO like you should be able to inject a sound into the video or watch a steady 0.256 volts.
* Siff signals are DC coupled. 0V means black. 1V means white.
* Siff signals can still be negative, meaning superblack or substracting signals !