Hitachi HV-D20P, Руководство по эксплуатации

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52
Long-Time Store Mode
In case that illumination on the subject is insufficient, just increasing the gain of the camera may cause an
increase in noise, resulting in an unclear image. In such a situation, it is advisable to select the long-time
store mode using the external memory. Thereby, the image can be brighter and clearer according to the
stored amount of image. This camera is provided with two kinds of image store functions (CCD
MODE:FLD/FRM in SUB MENU 1). When one of these image store functions is used, video signal output
is delivered from the camera with the timing shown below.
Since the degree of after-image increases for a moving subject because of image storing, it is recommended
to use the image store function when taking a still picture or scene.
C C D line A
E ven field
odd field
F ield store m ode
Aa
Ab Ac Ad
Ba Bb Bc Bd
Ab+
Bb
Ac+
Bc
Aa+
Ba
V D sign al
S tore ch arge
on C C D lin e A
V ideo sign al
S tore tim e: 1/15 s (E xam p le)
W E sign al
In th e fie ld sto re m o d e , b o th th e C C D lin e s
A an d B are read ou t sim u ltan eou sly. A fter
com pletion of storin g, video sign al ou tp u t is
m ad e on th e n ext field. Im m ediately before
t h e f i e l d o n w h i c h v i d e o s i g n a l o u t p u t i s
m a d e , th e W E s ig n a l is d e liv e re d fr o m th e
D - S U B c o n n e c t o r e q u i p p e d o n t h e r e a r
pan el.
E ven field
C C D line B
C C D line A
C C D line B
S tore ch arge
on C C D lin e B