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1995-08-13
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GSH-PC - 1 - Norms_e.doc
----------------------------------------------------------------------
Description of the SSTV modes/speeds supported by GSHPC
========================================================
The following assumes a SSTV video signal showing a colour bar image
with the following order of colours (from left to right);
white / yellow / cyan / green / magenta / red / blue / black
1./ Martin Modes
============
Martin-Modes were developed by Martin H Emmerson. G3OQD.
Martin-Modes are all free-running (also called "New Modes").
Mode | Colour | Resolution #1 | Resolution #2 | format
Nickname | seq. | Pixel x Line | Pixel x Line | B x H
-----------+--------+----------------+----------------+------------
Martin-M1: | G-B-R | 320 x 256 | 320 x 256 | 4:3
Martin-M2:*| G-B-R | 160 x 256 | 160 x 256 | 4:3
Martin-M3: | G-B-R | 320 x 128 | 320 x 256 | 4:3
Martin-M4: | G-B-R | 160 x 128 | 160 x 128 | 4:3
* M2 can be received on setting M4.
#1 Resolution of transmitted image
#2 Displayed resolution
Green Blue Red
|<------------->|<------------->|<----------->|
+-------+ +-+ +-+ +-+ +-+ +---+ +---+
| | | | | | | | | | | | | |
| | | | | | | | | | | | | |
| | | | | | | | | | | | | | |
--+ ++ +-------+ +-+ +-+ +-+ +-+ +---+ +---+ ++
| | | |
+-+ +-+
5ms|(synch) M1/M3 3x147 ms |
5ms|(synch) M2/M4 3x 73 ms |
|<---------------------------------------------->|
2./ Scottie Modes
=============
Scottie Modes were developed by E.T.J Murphy GM3SBC.
The (modified) Scottie Modes are Free-Running modes.
Mode | Colour | Resolution #1 | Resolution #2 | format
Nickname | seq. | Pixel x Line | Pixel x Line | B x H
-----------+--------+----------------+----------------+-------------
Scottie-S1 | G-B-R | 320 x 256 | 320 x 256 | 4:3
Scottie-S2*| G-B-R | 320 x 128 | 160 x 250 | 4:3
Scottie-S3 | G-B-R | 320 x 128 | 320 x 128 | 4:3
Scottie-S4 | G-B-R | 160 x 128 | 160 x 128 | 4:3
Scottie-DX | G-B-R | 320 x 256 | 320 x 256 | 4:3
* S2 can be received on setting S4.
#1 Resolution of transmitted image
#2 Displayed resolution
GSH-PC - 2 - Norms_e.doc
----------------------------------------------------------------------
Green Blue Red
|<------------->|<------------->| |<------------->|
+-------+ +-+ +-+ +-+ +-+ +---+ +---+
| | | | | | | | | | | | | |
| | | | | | | | | | | | | |
| | | | | | | | | | | | | |
--+ +-------+ +-+ +-+ +-+ +-+ ++ +---+ +--+-
| | | |
| +-+ |
| S1/S3 3 x 140 ms + 9ms (synch) |
| S4 3 x 90 ms + 9ms (synch) |
| SDX 3 x 347 ms + 9ms (synch) |
|<----------------------------------------------->|
3./ Wraase SC-2 Colour Modes
========================
SC-1 and SC-2 modes were developed by Volker Wraase in Kiel.
The old SC-1 modes are not supported by GSHPC.
The improved SC-2 modes are Free-Running modes.
Mode | Colour | Resolution #1 | Resolution #2 | format
Nickname | seq. | Pixel x Line | Pixel x Line | B x H
-----------+--------+----------------+----------------+------------
SC-2 30s | R-G-B | 256 x 128 | 320 x 128 | 4:3
SC-2 60s | R-G-B | 256 x 256 | 320 x 256 | 4:3
SC-2 120s | R-G-B | 512 x 256 | 320 x 256 | 4:3
SC-2 180s | R-G-B | 512 x 256 | 320 x 256 | 4:3
#1 Resolution of transmitted image
#2 Displayed resolution
Red Green Blue
|<-------------->|------------------------->|<------------->|
+---+ +---+ +------------+ +-+ +-+ +-+ +-+
| | | | | | | | | | | | | |
| | | | | | | | | | | | | |
| | | | | | | | | | | | | |
-+ ++ +---+ +---+ +-------------+ +-+ +-+ +-+ ++ +
| | | | | |
+-+ | | +-+
5ms|(synch) | | |
| 58 ms | SC_2 30s 117 ms | 58 ms |
| 58 ms | SC_2 60s 117 ms | 58 ms |
| 117 ms | SC_2 120s 235 ms | 117 ms |
| 235 ms | SC_2 180s 235 ms | 235 ms |
|<-------------->|<------------------------>|<------------>|
GSH-PC - 3 - Norms_e.doc
----------------------------------------------------------------------
3. ROBOT Color Modes
=================
Robot modes were developed by ROBOT RESEARCH, INC. San Diego CA9211
(e.g. Robot-1200c). Originally Robot-Modes were not free-running modes,
modified Robot-1200c and compatible converters using Martin EPROMs and
high-performance oscillators can receive and transmit these modes using
the free-run facility. GSH-PC can receive all Robot modes as normal or
free-running.
Mode | Colour | Resolution #1 | Resolution #2 | format
Nickname | seq. | Pixel x Line | Pixel x Line | B x H
-----------+--------+----------------+----------------+------------
ROBOT 12s | Y-U-V | 160 x 120 *A | 160 x 120 | 4:3
ROBOT 24s | Y-U-V | 320 x 120 *B | 320 x 120 | 4:3
ROBOT 36s | Y-U-V | 320 x 240 *A | 320 x 240 | 4:3
ROBOT 72s | Y-U-V | 320 x 240 *B | 320 x 240 | 4:3
#1 Resolution of transmitted image
#2 Displayed resolution
*A Typ-A: Colour information for each 2nd. line.
*B Typ-B: Colour information for each line.
Typ-A: Colour information (R-Y) in each odd line.
____
| ----____ ################
| ----____ +################+
| ----____ |################|
--+ ++ ------+ + +--
| | | |
+-+ | | +-+
10,5ms| | 12s-Mode 90ms 4,5ms | | 45ms |
7ms | | 36s-Mode 60ms 3ms | | 30ms |
-/-/<------------------------------->/-/<-------------->|
B/W image (Y) col-sync. R-Y
Typ-A: Colour information (B-Y) in each even line.
____ _
| ----____ | |################
| ----____ | +################+
| ----____ | ################|
--+ ++ ----+ + +--
| | | |
synch.+-+ | | +-+
10,5ms| | 12s-Mode 90ms 4,5ms | | 45ms |
7ms | | 36s-Mode 60ms 3ms | | 30ms |
-/-/<------------------------------->/-/<-------------->|
B/W image (Y) col-sync. B-Y
Typ-B. Colour information (R-Y) and (B-Y) in each line.
___ _
| ---___ ###########| |############
| ---___ +###########+ +############+
| ---___ |########### ############|
--+ ++ -----+ + +--
| | | |
synch.+-+ | | | | +-+
12 ms | | 24s-Mode 88 ms | | 44 ms | | 44ms |
12 ms | | 72s-Mode 138 ms | | 69 ms | | 69ms |
/-/<----------------------->/-/<--------->/-/<---------->|
6 ms R-Y 6 ms B-Y
B/W image (Y) 1.col-sync. 2.col-sync.
GSH-PC - 4 - Norms_e.doc
----------------------------------------------------------------------
Black/white Modes
==================
Robot modes were developed by ROBOT RESEARCH, INC. San Diego CA9211
(e.g. Robot-1200c). Originally the Robot-Modes were not free-running
modes. Modified Robot-1200c and compatible converters using Martin
EPROMs and high-performance oscillators can receive and transmit these
modes using the free-run facility. GSH-PC can receive all Robot modes
in normal or free-running configuration.
Mode | Colour | Resolution #1 | Resolution #2 | format
Nickname | seq. | Pixel x Line | Pixel x Line | B x H
-----------+--------+----------------+----------------+--------
SC-1 8s | Bright.| 128 x 128 | 160 x 128 | 1:1
SC-1 16s | Bright.| 256 x 128 | 320 x 128 | 1:1
SC-1 16sq | Bright.| 128 x 256 | 160 x 256 * | 1:1
SC-1 32s | Bright.| 256 x 256 | 320 x 256 | 1:1
Robot 8s | Bright.| 160 x 120 | 160 x 120 | 4:3
Robot 12s | Bright.| 320 x 120 | 320 x 240 | 4:3
Robot 24s | Bright.| 320 x 240 | 320 x 240 | 4:3
Robot 36s | Bright.| 320 x 240 | 320 x 240 | 4:3
#1 Resolution of transmitted image
#2 Displayed resolution
* SC-1 16s "quasi" can be received in SC-1 8s mode.
white
____----+
____---- |
black ____---- |
--+ +---- ++ +--
| | | |
+-+ +-+
| |
SC-1 8s |5ms 60 ms |
SC-1 16s |5ms 120 ms |
SC-1 16sq |5ms 60 ms |
SC-1 32s |5ms 120 ms |
ROBOT 8s: |10ms 66 ms |
ROBOT 12s: |7ms 100 ms |
ROBOT 24s |12s 100 ms |
ROBOT 36s: |12s 150 ms |
|<----------------------------->|
GSH-PC - 5 - Norms_e.doc
----------------------------------------------------------------------
The Vertical Interval Signal (VIS)
==================================
The VIS-code, introduced by ROBOT, is used by lot of SSTV-stations to
indicate the used mode/speed at the beginning of the transmission.
The VIS-code, decoded by the receiving station, allows automatic
selection of the correct mode/speed. The VIS-code is part of the
vertical sync pulse, and consists of 10 bits each 30 ms long. The first
and last bit (start and stop bits) are represented by 1200 Hz tones.
The VIS-code is coded in the remaining 8 bits, including one (even)
parity bit. There are 128 possible combinations.
1900 Hz 1900 Hz
------------+ +------------+ +-start-bit +-
grey | | grey | | example-code = 43 dec. |
| | | | b1 b2 b3 b4 b5 b6 b7 parity |
| | | V |
| | "0"=1300 Hz| +--+ +--+ +--+ +--+ stop |
+-+ 1200 Hz+--+ | | | | | | | +--+---+
10ms "1"=1100 Hz +--+ +--+ +--+ +--+
| | | | | |
| ca.300 ms | | ca.300 ms | 10x30ms = 300ms | t*|
|<----------/-/<---------->|<--------------------------->|<->|
*t is the horizontal sync pulse of the first line, the length is
dependent on the current SSTV speed. This length is very impor-
tant for the correct horizontal image position.
The meaning of the bits (with some exceptions);
+---+---+---+---+---+---+---+---+
| P | b7| b6| b5| b4| b3| b2| b1| <--LSB least significant bit
+---+---+---+---+---+---+---+---+
| | | | | | | |
| | | | | | +---+---+
| | | | | | | 0 | 0 | -> Color composite video
| | | | | | | 0 | 1 | -> b/w Red image
| | | | | | | 1 | 0 | -> b/w Green image
| | | | | | | 1 | 1 | -> b/w Blue image
| | | | | | +---+---+
| | | | | | Horizontal resolution
| | | | | +---+ =====================
| | | | | | 0 | -> 128/160 Pixel
| | | | | | 1 | -> 256/320 Pixel
| | | | | +---+
| | | | | Vertical resolution
| | | | +---+ ===================
| | | | | 0 | -----> 128/120 lines
| | | | | 1 | -----> 256/240 lines
| | | | +---+
| | | | Manufacturer / mode
| +---+---+---+ ===================
| | 0 | 0 | 0 | ---> ROBOT
| | 0 | 0 | 1 | ---> Wraase SC-1
| | 0 | 1 | 0 | ---> Martin (G3OQD)
| | 0 | 1 | 1 | ---> Scottie (GM3SBC) & Wraase SC-2
| | 1 | 0 | 0 | ---> AVT-Mode & Scottie-DX
| | 1 | 0 | 1 | ---> r.f.u. (reserved for future use)
| | 1 | 1 | 0 | ---> r.f.u.
| | 1 | 1 | 1 | ---> r.f.u.
| +---+---+---+
|
+------------------> Parity-Bit (Even)
GSH-PC - 6 - Norms_e.doc
----------------------------------------------------------------------
The complete list of the available VIS-codes;
The LSB of the VIS-code (bit-1) is sent first, as usual by serial
data communication. Logical 1 is represented by 1100 Hz and
logical 0 by 1300 Hz. The start and stop bits are modulated at 1200 Hz.
+---------------+---------------+----------+
| Norm-Nickname |msb bits lsb| decimal |
| | 7 6 5 4 3 2 1 | value |
+---------------+---------------+----------+
| ROB 12s col. | 0 0 0 0 0 0 0 | 0 | 1: red image
| ROB 8s b/w | 0 0 0 0 0 x x | 1,2,3 | ---> 2: green image
| ROB 24s col. | 0 0 0 0 1 0 0 | 4 | 3: blue image
| ROB 12s b/w | 0 0 0 0 1 x x | 5,6,7 |
| ROB 36s col. | 0 0 0 1 0 0 0 | 8 |
| ROB 24s b/w | 0 0 0 1 0 x x | 9,10,11 |
| ROB 72s col. | 0 0 0 1 1 0 0 | 12 |
| ROB 36s b/w | 0 0 0 1 1 x x | 13,14,15 |
+---------------+---------------+----------+
| 24s col SC-1* | 0 0 1 0 0 0 0 | 16 |
| 8s b/w SC-1 | 0 0 1 0 0 x x | 17,18,19 |
| 48s col SC-1* | 0 0 1 0 1 0 0 | 20 |
| 16s b/w SC-1 | 0 0 1 0 1 x x | 21,22,23 |
| 48q col SC-1* | 0 0 1 1 0 0 0 | 24 |
| 16q b/w SC-1* | 0 0 1 1 0 x x | 25,26,27 |
| 96s col SC-1* | 0 0 1 1 1 0 0 | 28 |
| 32s b/w SC-1 | 0 0 1 1 1 x x | 29,30,31 |
+---------------+---------------+----------+
| Martin-M4 | 0 1 0 0 0 0 0 | 32 |
| Martin-M3 | 0 1 0 0 1 0 0 | 36 |
| Martin-M2 * | 0 1 0 1 0 0 0 | 40 |
| Martin-M1 | 0 1 0 1 1 0 0 | 44 |
+---------------+---------------+----------+
| Scottie-4 | 0 1 1 0 0 0 0 | 48 |
| Scottie-3 | 0 1 1 0 1 0 0 | 52 |
| Scottie-2 * | 0 1 1 1 0 0 0 | 56 |
| Scottie-1 | 0 1 1 1 1 0 0 | 60 |
| Scottie-DX | 1 0 0 1 1 0 0 | 76 # |
+---------------+---------------+----------+
| SC2 col 30s | 0 1 1 0 0 1 1 | 51 |
| SC2 col 180s | 0 1 1 0 1 1 1 | 55 |
| SC2 col 60s | 0 1 1 1 0 1 1 | 59 |
| SC2 col 120s | 0 1 1 1 1 1 1 | 63 |
+---------------+---------------+----------+
| AVT col 24s * | 1 0 0 0 0 0 0 | 64 |
| AVT col 90s * | 1 0 0 0 1 0 0 | 68 |
| AVT col 98s * | 1 0 0 1 0 0 0 | 72 |
| AVT col 188s* | 1 0 0 1 1 0 0 | 76 # |
| AVT b/w 125s* | 1 0 1 0 0 0 0 | 80 |
+---------------+---------------+----------+
# Scottie-Dx and AVT-188s share the same VIS-code.
* Not supported by GSH-PC.
- When in B/W mode GSH-PC always sends the "green" code.
Martin mode was developed by Martin H. Emmerson G3OQD /England.
SC-1 and SC-2 converters were developed by Volker Wraase /Germany.
The Scottie mode was developed by E.T.J. Murphy GM3SBC /Scotland.
ROBOT is a trademark of ROBOT Research Inc. /USA.
