专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

11. 发明专利

JPS5496917A VIDEO SIGNAL PROCESS CIRCUIT 失效
公开(公告)号：JPS5496917A
公开(公告)日：1979-07-31
申请号：JP330178
申请日：1978-01-18
申请人： HITACHI ELECTRONICS
发明人： UKIGAYA FUMIO , ONO YUKIO , OOOKA MASAHARU
IPC分类号： H04N5/18
摘要： PURPOSE:To stabilize the black level of the video signal as well as to delete the low-band conversion noise by constituting the signal process by combining the pre- amplifier which stabilized the video signal DC level in the double feedback way and the automatic fixing circuit of the black level. CONSTITUTION:Pre-amplifier 1 which stabilized the DC level of the video signal receiving the feedback of double feedback level setting circuit 3 and 5 is provided, along with blanking gate circuit 6 which supplies the output of amplifier 1 and the blanking pulse and deletes the noise for the horizontal flyback time of the video signal. In addition , the video signal output of circuit 6 is applied to clamping circuit 7, and the video signal is clamed to the clamping potential. For this clamped signal, the area corresponding to the video signal period of the vertical flyback period is sample-held at sample-holding circuit 8. Then the sample-held signal is compared with reference potential ES through comparison amplifier 9, and the error is fed back to the clamping potential to stabilize the black level as well as to delete the low-band conversion noise.

12. 发明专利

JPS518823A TEREBIJONKAMERANO MONITAHOSHIKI 失效
公开(公告)号：JPS518823A
公开(公告)日：1976-01-24
申请号：JP7827374
申请日：1974-07-10
申请人： HITACHI ELECTRONICS , JAPAN BROADCASTING CORP
发明人： OONISHI TETSUO , OOOKA MASAHARU , WAKUI KOTARO , ENDO TSUGIO , KUSHIDA ISAMU , OONISHI KAZUNORI
IPC分类号： H04N5/225 , H04N9/04 , H04N17/02

13. 发明专利

JPS57166793A COLOR TELEVISION CAMERA 失效
公开(公告)号：JPS57166793A
公开(公告)日：1982-10-14
申请号：JP5177781
申请日：1981-04-08
申请人： HITACHI ELECTRONICS
发明人： OOOKA MASAHARU
IPC分类号： H04N9/04 , H04N5/232
摘要： PURPOSE:To realize the simultaneous viewing of the images of three waveforms R, G and B for level display, by mixing plural waveform video signals into the video signal of a viewfinder with switching in terms of time. CONSTITUTION:The switches S1, S2 and S3 are switched successively by the pulse signal. Thus the output of the emitter follower of a transistor Q4 arranges the signals R, G and B in a time series form which is switched with every horizontal scan or vertical scan. The video signal viewed through a viewfinder VF is fed to the VF through a terminal 4, a transistor Q5, a resistance R7 and a terminal. In this case, the time series signals R, G and B are mixed into the videosignal of the finder VF via a resistance R5. Thus the images of three waveforms R, G and B for level display which are superposed on the image can be viewed at one time through the finder VF.

14. 发明专利

JPS56144672A GENERATION SYSTEM FOR FLARE CORRECTING PULSE 失效
公开(公告)号：JPS56144672A
公开(公告)日：1981-11-11
申请号：JP4806380
申请日：1980-04-14
申请人： HITACHI ELECTRONICS
发明人： OOOKA MASAHARU
IPC分类号： H03G3/10 , H04N5/21 , H04N5/217
摘要： PURPOSE:To obtain a flare-correcting pulse at an output terminal by supplying a video signal to the input side of a variable gain control amplifier, by supplying a control pulse and gain control voltage to the gain control terminal, and by operating the variable gain control amplifier only in flyback time. CONSTITUTION:Video signal (a) is supplied to input terminal 1 of a differential variable gain control amplifier and a gain control voltage obtained by dividing the voltage of power source +Vcc and horizontal synchronizing signal HD of the positive polarity as a control pulse are applied to gain control terminal 3. Then, flyback time tb synchronizes with horizontal synchronizing signal HD, so the variable gain amplifier is put in operation only during this period, so that the peak value of blanking pulse Pd at output terminal 2 will increase from (h3) to (h4) in proportion to variations in (h1) and (h2) which correspond to an increase or decrease in the white area of an object. When this pulse is added to the video signal with the opposite polarities, black level BL drops down to a proper value. Consequently, a flare phenomenon due to irregular reflection in an image pickup tube is corrected by one integrated circuit.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式