Videotek VTM-2000 Specifications download pdf (Page 21)

Operation

VTM-200 Installation and Operation Handbook 3-5

GENERAL CHARACTERISTICS OF SERIAL COMPONENT

SIGNALS

• Serial data rate: 270 Mb/s

• Serial digital signal amplitude: 800 mV p-p (Note: not video signal amplitudes)

• 1440 data words in active video

• 276 data words in horizontal blanking (525 line system)

• 288 data words in horizontal blanking (625 line system)

• Serial transmission uses 10-bit words but 8-bit words are allowed (lower two bits

set to logical 0)

SUPER VGA (SVGA) Display

Figure 3-2 illustrates a four-quadrant display of a serial digital signal. The picture in

the upper right quadrant indicates that the signal is a full field color bar test pattern.

The waveform display in the lower right quadrant has been set to display the Y, C

and C

components of the signal in a time-paraded fashion. Above the waveform, the

vertical gain is indicated as being x1, and the horizontal waveform time scale is

indicated as 15 μs per major division. In the lower left quadrant, the vector display

shows the color content of the signal as a plot of C

horizontally versus C

vertically.

The tie lines between targets within the circle indicate the transitions between colors in

the test pattern. The STATUS is indicated between the waveform and vector displays.

The signal is not ON AIR, because the ON AIR legend background is not illuminated

in red. The SOURCE ID has been set to read INPUT C. The ERROR conditions

shown are: no GAMUT error, EDH present, but no EDH errors are occurring; and no

DATA errors are occurring. At the lower left of the vector display, the signal standard

is indicated as 525 (lines per frame) / 60 (Hz vertical rate), the selected INPUT is again

identified as being on connector C, and the selected REFRENCE (REF) is indicated as

INTERNAL (INT). The audio levels display in the upper left quadrant.

The source of the audio is indicated as channel C, which is a serial digital source, with

the REF set for -20 dBfs. This means that a digital audio signal at a level 20 dB below

the analog level corresponding to the full scale value will be represented as a green bar

extending from the bottom of a scale to the zero mark on the scale. The LEFT (L)1,

RIGHT (R)1, L2, and R2 audio components of channel C are all at levels of 0 dB

relative to the reference. The φ1 phase difference scale shows its yellow indicator

mark as being in the upper red area between the 0 and -1 marks. This means that the

phase difference between L1 and R1 is more than 90° (0 mark) and is approaching

180° (-1 mark). The implication is that the audio signals on L1 and R1 are either 2

independent monophonic channels, or that the signal polarity of one of them is

reversed, if they really are a stereo pair. The φ2 phase difference scale shows the

signals on L2 and R2 at a less than 90° phase difference.

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Videotek VTM-2000 Specifications Page 21

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