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a AUTOMATIC SEARCH OPERATION
Automatic search operation is executed by checking the synchronous and UP or DOWN signal input given above.
The procedure of the automatic search operation is described below. Automatic search consists of 4 modes (mode 0
~mode
3). Operation in each mode is as follows:
V1
Range of
just tuning
Range of
just tuning
fs
UP. signal
DOWN signal
Synchrono!
———s
UP search
Escaping station
a Mode 0:
Detecting synchronous—yes and UP signal—yes
a Mode 1 :
Detecting synchronous—yes and DOWN signal—yes
« Mode 3: Digital AFT.
a Mode 2:
sound signal
In AFC signal, V : picture signal, S :
Fig. 15. AFC Signal, Synchronous Signal and Procedure of Search Procedure of Research
63
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