Service manual

A-16
Genlock
A
Technical specifications
◆
Genlock
Interface specification Type of reference PAL/NTSC composite sync with
black and burst
Accepted line frequency tolerance ±0.1 Hz, both NTSC and PAL
Type of connector BNC
Number of reference inputs One high-impedance allowing
loop-through via external T-con-
nector. Termination to be done
externally.
Return loss using external 75 Ω termination > 35 dB, 10 Hz to 5.5 MHz, with or
without power
Nominal input level 0 dBV
Video performance Synchronization method Drop or repeat a video frame
Delay adjustment Up to ±7 lines in steps of one
27 MHz clock period.
VBI performance Synchronization method Drop or repeat VBI for the video
frame being dropped or repeated
respectively.
Audio performance Steady-state delay relative to video -20 to +40 ms on primary audio
output
±5 ms on secondary Layer II audio
output
Delay relative to video when Primary output: Defined by
repeating or dropping a video frame decoder chip.
On secondary Layer II output ±45 ms up to 200ms (TBC) after
video genlock. Hereafter steady-
state delay is required.
On secondary NICAM output As primary audio output.
Linear audio
performance
Steady-state delay relative to video ±5 ms
Delay relative to video when ±45 ms up to 200ms (TBC) after
repeating or dropping a video frame video genlock. Hereafter steady-
state delay is required.