Re: RS-343 video output?

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Tom Fuke (tom++at++war.reading.sgi.com)
Wed, 6 Mar 1996 09:21:14 +0000

Hi Nicolas,

There's a vof called "960x802_30i" which has the following characteristics
(copied straight from /usr/gfx/ucode/RE/dg2/vof/README).

Active Line Length: 960 pixels, 30.99 usec.
Vertical Active Height: 802 lines
Nominal Line Period (total width): 1180 pixels, 38.10 usec.
Lines Per Frame: 875 lines
Pixel Clock: 30.975000 MHz, period = 32.284100
nsec. Horizontal Line Frequency: 26.250 KHz
Horizontal Sync Duration: 85 pixels, 2.74 usec.
Horizontal Back Porch Duration: 105 pixels, 3.39 usec.
Horizontal Front Porch Duration: 30 pixels, 0.97 usec.
Vertical Front Porch Duration: 3540 pixels, 3.0 lines, 0.11 msec
Vertical Sync Duration: 3540 pixels, 3.0 lines, 0.11 msec
  Sync Pulse Duration: 530 pixels, 17.11 usec
  Sync Pulse Count: 6
Vertical Back Porch Duration: 36580 pixels, 31.0 lines, 1.18 msec
VWALK to ACTIVID duration: 10640 pixels, 9.016949 lines
Frame Frequency: 30 Hz Interlaced, 2 Fields
Flags: (None)

It looks like it falls into the description of RS-343-A as summarised at
the EIA web site:

http://207.17.181.15:80/eng/allstd/std/files/EIA-343A.htm

--------------------------------------------------------------------
EIA-343-A

Electrical Performance Standard for High Resolution
Monochrome closed Circuit Television Camera (Sept.,
1969)

    "This Standard encompasses equipment which operates in
     the range from 675 to 1023 scanning lines with a field
     rate of 60 Hz, interlaced 2:1. This Standard consists of
     (1) Definitions, (2) minimum Standards, and (3) Method of
     Measurement for those parameters believed to be of importance."

--------------------------------------------------------------------

cheers,
tom

---



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