S-Video to Composite - Revision history

Marks Polakovs: 10 revisions imported: Imported from docswiki

2023-08-06T12:45:14Z

10 revisions imported: Imported from docswiki

← Older revision	Revision as of 12:45, 6 August 2023
(No difference)

docs>Jw2199 at 16:42, 3 August 2021

2021-08-03T16:42:49Z

← Older revision		Revision as of 16:42, 3 August 2021
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	{{OldKit\|Want to convert from one format we don't use to another? If you're not the [[hist:~~Archive Officer~~\|~~Archive Officer~~]] you probably won't find anything useful here, and even if you are I don't know if any of this kit exists or where it would be.}}		{{OldKit\|Want to convert from one format we don't use to another? If you're not the [[hist:Heads of Archives\|Head of Archives]] you probably won't find anything useful here, and even if you are I don't know if any of this kit exists or where it would be.}}
	{{HDNO}}		{{HDNO}}
	S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:		S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:

docs>Jw2199 at 16:41, 3 August 2021

2021-08-03T16:41:36Z

← Older revision		Revision as of 16:41, 3 August 2021
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	{{OldKit}}		{{OldKit\|Want to convert from one format we don't use to another? If you're not the [[hist:Archive Officer\|Archive Officer]] you probably won't find anything useful here, and even if you are I don't know if any of this kit exists or where it would be.}}
	{{HDNO}}		{{HDNO}}
	S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:		S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:

docs>Jw2199 at 16:39, 3 August 2021

2021-08-03T16:39:26Z

← Older revision		Revision as of 16:39, 3 August 2021
Line 1:		Line 1:
	{{~~Old Kit~~}}		{{OldKit}}
	{{HDNO}}		{{HDNO}}
	S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:		S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:

docs>Jw2199 at 16:39, 3 August 2021

2021-08-03T16:39:19Z

← Older revision		Revision as of 16:39, 3 August 2021
Line 1:		Line 1:
			{{Old Kit}}
	{{HDNO}}		{{HDNO}}
	S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:		S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:

Connor.sanders at 09:39, 23 July 2021

2021-07-23T09:39:14Z

← Older revision		Revision as of 09:39, 23 July 2021
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	As always, when using bodge cables, please test them first, as the plastic s-video connectors aren't the most sturdy things around...		As always, when using bodge cables, please test them first, as the plastic s-video connectors aren't the most sturdy things around...

	~~[[Category:Technical]]~~
	[[Category:Vision Path]]		[[Category:Vision Path]]
	[[Category:Home-Made]]		[[Category:Home-Made]]

docs>Robert.walker at 13:48, 11 July 2013

2013-07-11T13:48:57Z

← Older revision		Revision as of 13:48, 11 July 2013
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	[[Category:Technical]]		[[Category:Technical]]
	[[Category:Vision Path]]		[[Category:Vision Path]]
			[[Category:Home-Made]]

docs>Robert.walker at 20:29, 9 July 2013

2013-07-09T20:29:01Z

← Older revision		Revision as of 20:29, 9 July 2013
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			{{HDNO}}
	S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:		S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:
	*1 - ground		*1 - ground
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	As always, when using bodge cables, please test them first, as the plastic s-video connectors aren't the most sturdy things around...		As always, when using bodge cables, please test them first, as the plastic s-video connectors aren't the most sturdy things around...

			[[Category:Technical]]
			[[Category:Vision Path]]

docs>Michael.chislett at 17:43, 5 January 2012

2012-01-05T17:43:15Z

← Older revision		Revision as of 17:43, 5 January 2012
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	~~A basic~~ S-~~Video to~~ composite ~~convertor can be made by a simple short of the two signal wires~~, and ~~the two ground wires of the S-Video. Looking AT an S-Video plug~~ (~~IE with pins~~) ~~with the rectangular notch of plastic at the bottom~~, ~~pin 4 is the pin~~ at ~~the top right, pin 3 is the top left,~~ pin 2 is ~~the bottom right, pin~~ 1 ~~is the bottom left.~~		S-video is basically just composite video, but split up into its chroma (colour) and Luma (brightness) parts, which both operate at different bandwidths. The pin allocation is like so:
			*1 - ground
			*2 - ground
			*3 - luma
			*4 - chroma

	~~In the simple bodge the results are useuable if absolutely necessary~~, ~~but gives poor colour quality~~, ~~and~~ a ~~ghosted image.~~		It comes in a horrible format from computer graphics cards, and other consumer devices. This isn't really useful for YSTV, so we have a few ways round using it:

	~~Pin 4 and 3 are connected straight to~~ the ~~signal pin of composite~~. ~~Pin 2~~ and ~~1 are connected straight to~~ the ~~ground pin~~ of ~~composite~~.		* The kramer convertor. This device is the preferred solution. The kramer converter performs Automatic gain control on the chroma and luma, based on the size of their respective sync pulses, before combining them. This solves many odd syncing issues with equipment.

	~~In the better~~, ~~but more complicated~~, ~~version a capacitor is used. The value of this capacitor can be anywhere between 400pF~~ and ~~10nF according~~ to the ~~web link : [http://www~~.~~epanorama.net~~/~~circuits~~/~~svideo2cvideo.html http://www.epanorama.net/circuits/svideo2cvideo.html]. One bought from Farnell used 420pF, Ystv has lots with 470pF capacitors~~.		* The bodge cable. This is a direct join of pin 3 to 4, and then 1 to 2. This means that no AGC is done, and the output signal isn't amplified to the correct level. The 3/4 mix goes to composite signal, and the 1/2 mix goes to composite ground.

	In the ~~complicated version~~ pin 4 ~~(the crominance~~) ~~is NOT connected straight~~ to the ~~composite~~ signal ~~pin~~. ~~Pin 4 is connected to the capacitor~~, ~~the other terminal of the capacitor is connected~~ to the ~~composite pin~~.		* The less bodge cable. This method is the same as the bodge cable, but first, chroma (pin 4) passes through a capacitor of 0.4nf to 1nf, before joining to the luma signal. This, in theory, stops any interesting termination problems from appearing, although, in practice, we haven't noticed any difference when compared to the basic bodge.

	~~Pin 3 (the luminance) is connected straight to the composite signal pin. If a physically small capacitor is used then it can just about be contained within the plug case~~, ~~this is of course a more durable method than having it exposed.~~		As always, when using bodge cables, please test them first, as the plastic s-video connectors aren't the most sturdy things around...

	~~As with the simple~~ bodge, the ~~complicated bodge has pins 1 and 2 connected straight to~~ the ~~compostie ground~~.

	~~Notes are that this will supposedly take an S-Video signal and convert it to a PAL or NTSC compatible composite signal~~. ~~75 ohm shielded cable should be used, failing that it should be shielded audio cable~~.

docs>Malcolm.chambers: First description

2009-12-25T01:38:12Z

First description

← Older revision		Revision as of 01:38, 25 December 2009
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	Pin 4 and 3 are connected straight to the signal pin of composite. Pin 2 and 1 are connected straight to the ground pin of composite.		Pin 4 and 3 are connected straight to the signal pin of composite. Pin 2 and 1 are connected straight to the ground pin of composite.

	In the better, but more complicated, version a capacitor is used. The value of this capacitor can be anywhere between ~~470pF~~ and 10nF according to the web link :		In the better, but more complicated, version a capacitor is used. The value of this capacitor can be anywhere between 400pF and 10nF according to the web link : [http://www.epanorama.net/circuits/svideo2cvideo.html http://www.epanorama.net/circuits/svideo2cvideo.html]. One bought from Farnell used 420pF, Ystv has lots with 470pF capacitors.

			In the complicated version pin 4 (the crominance) is NOT connected straight to the composite signal pin. Pin 4 is connected to the capacitor, the other terminal of the capacitor is connected to the composite pin.

			Pin 3 (the luminance) is connected straight to the composite signal pin. If a physically small capacitor is used then it can just about be contained within the plug case, this is of course a more durable method than having it exposed.

			As with the simple bodge, the complicated bodge has pins 1 and 2 connected straight to the compostie ground.

			Notes are that this will supposedly take an S-Video signal and convert it to a PAL or NTSC compatible composite signal. 75 ohm shielded cable should be used, failing that it should be shielded audio cable.