Quantum Data 801GC, 801GF, 801GX manual SMPTEbar

SMPTEbar

Description:	This image is based on an engineering guideline
	(EG 1-1990) test signal specified by the Society of
	Motion Picture and Television Engineers (SMPTE).
	The SMPTE pattern, in turn, is derived from an EIA
	standard test pattern (RS-189-A). The image, is set
	up to be generated by an 801GX as an encoded TV
	output. It is designed for adjusting the color settings
	of a television monitor by eye. It can also be used
	with a TV waveform analyzer and vectorscope for
	testing video signal processors and color decoders.
	The image is available on all models as a component
	RGB signal. Some of the image’s elements have some
	differences from the original SMPTE specification.
	These differences are given in descriptions of the
	individual elements.
	1)	The upper 67% of the image consists of a series
		of color bars. These bars match the order of
		the bars in the SMPTE and EIA patterns. They
		are similar to the 801GX’s TVBar_75 image
		without the last black bar.
	2)	The left hand side of the lower 25% of the image
		contains isolated -Iand Q color difference
		signals that match the original EIA and SMPTE
		patterns. The -I signal appears as a bluish gray
		bar and the Q signal appears as a purple bar
		on a TV monitor. The bars are separated by a
		white (+100 IRE) bar.
	3)	The right hand side of the lower 25% of the
		image contains a narrow 12.5 IRE gray bar.
		Due to a hardware limitation on the 801GX,
		this portion of the pattern does not match the
		original EIA and SMPTE patterns. The original
		patterns had +3.5 (blacker than black) and +11.5
		IRE bars separated by a +7.5 IRE (black) bar.
	4)	The remaining central 8% of the image contains
		a row of chroma set bars. These bars are part
		of the SMPTE pattern but are not in the EIA
		pattern. The order of the alternating color and
		black bars matches those in the SMPTE pattern.

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