Hitachi HV-D27A, HV-D37A operation manual Long-TimeStore Mode

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.

	Field store m ode
E ven field	C C D line A
odd field	C C D line B
Even field	C C D line A
	C C D line B

Store tim e: 1/15 s (E xam ple)

In th e field store m ode, both th e C C D lin es

Aand B are read out sim ultaneously. A fter com pletion of storing, video signal output is m ade on the next field. Im m ediately before

th e fie ld o n w h ic h v id e o s ig n a l o u tp u t is m a de , th e W E sign a l is d elive re d fro 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 panel.

V D signal

Store charge on CC D line A Store charge on CC D line B

V ideo signal

Aa		Ab		Ac		Ad
Ba		Bb		Bc		Bd
	Aa+		Ab+		Ac+
	Ba		Bb		Bc

W E signal

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