Sony FCBEX11DP User Manual (FCB-EX11D_Technical_Manual) - Page 12

Synchronization methods, NTSC=28.636363 MHz

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Synchronization methods Internal and external synchronization are available; VISCA Commands allow you to switch between them. • Internal synchronization An internal vibrator inside the camera generates a synchronizing signal as a basic oscillator. NTSC=28.636363 MHz PAL=17.7344 MHz • External synchronization (V-Lock Synchronization 1)) When a TTL level V-Lock pulse is input, the camera synchronizes to the input signal (V-Lock synchronization). The frequency of the input signal synchronizes to within ±1Hz of the external synchronization. Also, 360 degree phase adjustment is possible due to the phase adjustment of the V-Lock signal. Because V-Lock synchronization is a simple synchronization method, color signals like a VBS "Genlock" signal cannot be synchronized. 1) In V-Lock synchronization, the camera makes a V-Lock pulse (VL-PULSE) which synchronizes to the commercial power supply and uses it as the external synchronization input signal of the camera, using the fact that the V cycle (59.97 Hz vertical synchronization signal) and the frequency of the commercial power supply (60 Hz). The synchronous signal of the camera will automatically sychronizes to the VL-PULSE in the camera. Basic Functions 12

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12
Basic Functions
Synchronization methods
Internal and external synchronization are available;
VISCA Commands allow you to switch between them.
• Internal synchronization
An internal vibrator inside the camera generates a
synchronizing signal as a basic oscillator.
NTSC=28.636363 MHz
PAL=17.7344 MHz
• External synchronization (V-Lock Synchronization
1)
)
When a TTL level V-Lock pulse is input, the camera
synchronizes to the input signal (V-Lock
synchronization). The frequency of the input signal
synchronizes to within ±1Hz of the external
synchronization.
Also, 360 degree phase adjustment is possible due to
the phase adjustment of the V-Lock signal.
Because V-Lock synchronization is a simple synchronization
method, color signals like a VBS “Genlock” signal cannot be
synchronized.
1)In V-Lock synchronization, the camera makes a V-Lock pulse
(VL-PULSE) which synchronizes to the commercial power
supply and uses it as the external synchronization input signal
of the camera, using the fact that the V cycle (59.97 Hz vertical
synchronization signal) and the frequency of the commercial
power supply (60 Hz). The synchronous signal of the camera
will automatically sychronizes to the VL-PULSE in the
camera.