5700MSC-IP
IP Network Grand Master Clock & Video Master Clock System
Revision 0.2 Page - 31
3.2.8. NTSC Genlock with Ten-field Reference
Figure 3-7: Lock Diagram #2 – NTSC Reference with Ten-field Reference
When an NTSC reference is applied that carries a ten-field reference pulse in the vertical blanking
interval (VBI) as specified in SMPTE ST 318, the phase locking ability of the 5700MSC-IP is
enhanced. The ten-field reference provides 5 frames worth of phasing information that allows
deterministic locking of 23.98Hz standards, the 6/1.001Hz pulse, and DARS/AES signals. These
outputs can be guaranteed to be the same phase between multiple units. The color frame sequence of
the NTSC reference is also decoded and used for phasing NTSC sync outputs. Note that the lock
diagram above (Figure 3-7) now shows a span of 5 frames instead of 2 frames for regular NTSC lock
(Figure 3-6).
X Y
NTSC-M
Reference
with ten-field
166.83ms
5 NTSC Frames
First Field of Ten-field Sequence
First Field of Ten-field Sequence
Z or X Preamble
X Y X Y X Y X Y X Y
Phase and Frequency Locked Outputs
NTSC-M
SD 525i/59.94
HD 1080i/59.94
HD 1080p/59.94
HD 720p/59.94
HD 1080p/29.97
HD 1080p/23.98(sF)
Slo-PAL 625i/47.95
480p/59.94
LTC 23.98Hz, 29.97Hz
DARS, AES, Wordclock
6/1.001Hz Pulse
NTSC Subcarrier
Frequency Locked Outputs (Random Phase)
Slo-PAL 625i/48
576p/50
LTC 24Hz
LTC 25Hz, 30Hz
PAL Subcarrier
1Hz Pulse
1/1.001Hz Pulse
PAL Color Frame Pulse
PAL-B
SD 625i/50
HD 1080i/50
HD 1080p/50
HD 1080p/25
HD 720p/50
HD 1080i/60
HD 1080p/30
HD 1080p/24(sF)
NTSC-M Subcarrier
Output (3.57MHz)
NTSC-M
Output
1080i/59.94
Output
720p/59.94
Output
LTC 29.97Hz
Output
DARS/AES
Outputs
48kHz
Wordclock
PAL-B
Output
4 5 6
4 5
4 5 6
4 5
1 2
3 4 5 6
1 2 3 4
6 75432
1
65
4321
End of Sync Word
End of Sync Word
Z or X Preamble
X Y X Y X Y X Y X Y X Y
X Y X Y X Y X Y X Y X Y X Y X Y X Y X YX Y X Y X Y X Y
AES Anchored to NTSC
MASTER CLOCK
/SPG
model
5601MSC
NTSC-M
Black Burst
Ten-field Pulse
on line 15
Frequency Locked, Random Phase
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