Fast Blanking Operation (pin 16 on SCART)

The fast blanking signal instructs the TV to select either external CVBS information or external RGB information. This is used to impose an on screen display (OSD) presentation (normally RGB) upon a CVBS background. This function is used when using the UHF selector on the RCU.

Fast blanking information has the same nominal phase as the RGB and CVBS signal, and is defined as follows on the SCART connector:

CVBS mode: SCART pin 16 voltage = 0 to 0,4 V (low) RGB mode: SCART pin 16 voltage = 1 to 3 V (high)

Normally the OSD is generated within the MPEG 2 decoder, but the encoder can superimpose OSD (RGB) on top of a CVBS signal emanating from VIN6. The encoder is synchronised to the CVBS signal.

The two fast blanking inputs are associated with the auxiliary RGB/CVBS inputs and the other associated with the Digital Encoder input. These are selected by I²C.

For more information refer to the post SCART Connector Pin Assignments.

Scart Connector Pin Assignments

The SCART (Syndicat des Constructeurs d'Appareils Radiorécepteurs et Téléviseurs) connector is used for combined audio and video connections. The connector is also known as Pertitel connector or Euroconnector.

A formal description is given in the CENELEC EN 50 049-1:1989 standard or in the IEC 933-1 standard. Different pin-configurations exist. Which confirations are available depends on the video device used. Sometimes one can choose the configuration (like composite or S-video) by changing a software setting. Two status signals define (partly) which video signals are active. A video device can use these status signals to automatically switch between internal or external audio/video signals.

Male front view

RGB Connection

Output connector		Input connector
1	Audio right out	2	Audio right in
3	Audio left (or mono) out	6	Audio left (or mono) in
4	Audio return	4	Audio return
7	Blue out	7	Blue in
5	Blue return	5	Blue return
11	Green out	11	Green in
9	Green return	9	Green return
15	Red out	15	Red in
13	Red return	13	Red return
16	RGB status out	16	RGB status in
14	RGB status return	14	RGB status return
19	Sync (composite video) out	20	Sync (composite video) in
17	Sync return	18	Sync return
21	Shield	21	Shield

S-Video Connection

Output connector		Input connector
1	Audio right out	2	Audio right in
3	Audio left (or mono) out	6	Audio left (or mono) in
4	Audio return	4	Audio return
15	Chrominance out	15	Chrominance in
13	Chrominance return	13	Chrominance return
8	Video status out	8	Video status in
19	Luminance out	20	Luminance in
17	Luminance return	18	Luminance return
21	Shield	21	Shield

Composite Video Connection

Output connector		Input connector
1	Audio right out	2	Audio right in
3	Audio left (or mono) out	6	Audio left (or mono) in
4	Audio return	4	Audio return
8	Video status out	8	Video status in
19	Composite video out	20	Composite video in
17	Composite video return	18	Composite video return
21	Shield	21	Shield

(Composite) Decoder Connection

Receiver connector		Decoder connector
1	Audio right out	2	Audio right in
2	Audio right in	1	Audio right out
3	Audio left out	6	Audio left in
6	Audio left in	3	Audio left out
4	Audio return	4	Audio return
8	Video status in	8	Video status out
19	Baseband out (scrambled)	20	Baseband in
17	Baseband out return	18	Baseband in return
20	Composite video in (unscrambled)	19	Composite video out
18	Composite video in return	17	Composite video out return
21	Shield	21	Shield

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EasyLink Connection (additional)

Television connector		Video recorder connector
10	I/O Control Bus	10	I/O Control Bus

EasyLink enables bi-directional communication between a television set and a video recorder. This way a video recorder can, for example, copy the channel settings of the television set. Who knows the details?

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Signal Levels

Signal	AC level	DC level	Impedance
Red, green, blue	Peak to blanking: 0...0.7 V ±3 dB	0...2 V	75 Ohm
Sync	Peak to peak: 0...0.3 V -3 dB...+10 dB	0...2 V	75 Ohm
Composite video	White to sync: 0...1.0 V ±3 dB	0...2 V	75 Ohm
Chrominance	0...0.3 V -3 dB...+10 dB	0...2 V	75 Ohm
Luminance	0...1.0 V ±3 dB	0...2 V	75 Ohm
MAC	Black to white: 0...1.0 V ±3 dB	0...2 V	75 Ohm
Audio in	0.2...2.0 V (nominal: 0.5 V)		>=10 kOhm
Audio out	Nominal: 0.5 V (maximum: 2.0 V)		<=1 kOhm
Video status	Low data rate communication: 0.0...2.0 V (e.g. remote control; Easylink)	Internal: 0.0...2.0 V External (16:9): 4.5...7.0 V External (4:3): 9.5...12.0 V	In: ZR>=10 kOhm ZC<=2 nF Out: ZR<=1 kOhm
RGB status		Internal: 0.0...0.4 V External: 1.0...3.0 V	75 Ohm