Title:
SAMPLING PHASE ADJUSTMENT DEVICE IN PICTURE PROCESSING SYSTEM
Document Type and Number:
Japanese Patent JP2624043
Kind Code:
B2
Abstract:
PURPOSE: To realize the phase adjustment device processing a test signal in the same signal path as that in the usual mode and adjusting sampling of a video camera section and automatically an A/D conversion timing of a picture processing section and to realize the picture processing system obtaining higher picture quality.
CONSTITUTION: A vertical driver 26b is controlled in the test mode to stop read of an optical charge from a CCD 23, a test signal generating circuit 39 generates a test signal (pseudo picture element signal) synchronously with the transfer clock of a horizontal driver 26a, a signal mixer circuit 40 mixes a test signal with an idle read output signal of the CCD 23 to transfer the result to an S/H circuit and color separate circuit 24. A picture processing section 22 obtains phase error information from an A/D conversion level of the test signal, outputs the information to a video camera section 21, which shifts the phase of the test signal thereby adjusting the phase of an internal clock to obtain optimum A/D conversion state.
Inventors:
Sadafumi Kaneda
Application Number:
JP21291291A
Publication Date:
June 25, 1997
Filing Date:
July 30, 1991
Export Citation:
Assignee:
Victor Company of Japan, Ltd.
International Classes:
H03L7/08; H03M1/12; H04N5/04; H04N5/232; (IPC1-7): H04N5/232; H03L7/08; H04N5/04
Domestic Patent References:
| JP63209375A |