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41. 发明专利

JPH0548947A COLOR CAMERA 失效
公开(公告)号：JPH0548947A
公开(公告)日：1993-02-26
申请号：JP22482991
申请日：1991-08-09
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ASADA RYOJI , NISHIKAWA SHOJI
IPC分类号： H04N5/21 , H04N5/228 , H04N9/04 , H04N9/64 , H04N9/65
摘要： PURPOSE:To perform the high resolution and to generate the high picture quality video signal of a high SN ratio by providing a circuit to remove the high area component of a luminance signal in the condition to hold a noise removing effect in order to remove the cross color of a video signal. CONSTITUTION:A limitter circuit 20 to clip the-output of a two-dimensional band pass filter 12 and a gain control circuit 21 to variable-amplify the output are provided. A gain control circuit 22 to variable-amplify other output of the two-dimensional band pass filter 12 is provided, and both outputs of gain control circuits 21 and 22 are added by an adder 23. The output of the adder 23 is subtracted by a subtracter 24 from the 1H delayed luminance signal, the delaying signal of an enhancer circuit 13 to generate an outline signal is added to the output by an adder 18, synthesized with a color difference signal by an encoder 11, and then, a video signal having a high SN value is obtained.

47. 发明专利

JPH04168481A COLOR ENCODER 失效
公开(公告)号：JPH04168481A
公开(公告)日：1992-06-16
申请号：JP29363090
申请日：1990-11-01
申请人： RICOH KK
发明人： MAEDA HIDEKAZU , SAKAGAMI HIROFUMI , TANAKA MASABUMI
IPC分类号： H04N11/14 , G09G5/04 , H04N9/65
摘要： PURPOSE:To make a device compact, and reduce a cost by making two input color signal correspond to each ROM for performing the balanced modulation digitally, and inputting address synchronized with the color signal, and adding the modulated output of both the two ROM, and thereafter, eliminating unnecessary component with BPF. CONSTITUTION:The feedback erasing period data 0 and the data A of a burst level are added to the digital color signal R - Y, B - Y by switching switches 12, 13, 14 with a predetermined method. An address generator 17 counts sampling clock CLK, and outputs an address corresponding to ROM 15, 16, namely, a coefficient of the color sub-carrying wave of cosine and sine component. The reset pulse RST is input to the address generator 17, and this address is reset to be synchronized with the color signal. Next, each balanced modulation output of the ROM 15, 16 is added by a computer 18, and thereafter, unnecessary frequency component is eliminated by BPF 19 to obtain the digital color encoded output. A device is thereby made compact and a cost is reduced.

49. 发明专利

JPH03273786A IMAGE PICKUP DEVICE 失效
公开(公告)号：JPH03273786A
公开(公告)日：1991-12-04
申请号：JP7184990
申请日：1990-03-23
申请人： CANON KK
发明人： NINOMIYA KUNIO
IPC分类号： H04N5/232 , H04N5/335 , H04N5/372 , H04N5/378 , H04N9/65 , H04N11/16
摘要： PURPOSE:To stably output a sub carrier and a burst signal without affecting the frequency of the second reference frequency signal with the frequency change of the first reference frequency by canceling the PLL control of the first and second reference frequency signals at the time of an external synchronizing mode. CONSTITUTION:In the case of the external synchronizing mode, an external synchronizing signal input discriminating circuit 11 detects that an external synchronizing signal is inputted from an input terminal 20, the voltage value of a signal line 15 is turned to a constant value and the frequency to be outputted from an Nfsc oscillator 10 is forcibly fixed. When the control voltage of the signal line 15 reaches a certain constant value, the Nfsc oscillator 10 to output an Nfsc clock signal is stably oscillated with the frequency Nfsc at the frequency of the voltage value. Thus, when the frequency Nfsc is stablized, the frequencies of the sub carrier and the burst signal to be outputted from a sub carrier burst generating circuit and a PLL circuit 8 are made stable as well.

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