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1. 发明专利

JPH08214389A VIDEO MONITORING SYSTEM 失效
公开(公告)号：JPH08214389A
公开(公告)日：1996-08-20
申请号：JP1932595
申请日：1995-02-07
申请人： YAGI ANTENNA
发明人： SAWAI TAKETOMO , AKIYAMA TAKAO , NISHIZAWA TAKAHIKO , SHIGA MICHINORI
IPC分类号： H04N7/18 , H04L12/28 , H04Q9/00
摘要： PURPOSE: To miniaturize equipments installed in an EPS (electric pipe space) or the like and to simplify the construction of a coaxial cable. CONSTITUTION: IF modulators are provided inside respective monitoring cameras 1a and 1b and photographed video signals are modulated to the intermediate frequency signals of channels A and B and outputted. The intermediate frequency signals of the channels A and B modulated by the IF modulators are inputted to the coaxial cable 3 by branching devices 2a and 2b, frequency multiplexed and inputted to an IF converter 5 installed inside the EPS 4. The IF converter 5 selects the signals of either channel A or channel B by control signals from a monitoring room, converts them to the frequency of the channel C and transmits them from the branching device 6 through a bus coaxial cable 7 to the monitoring room or the like. In the monitoring room, the video signals of the channel A or the channel B sent from the IF converter 5 are demodulated, projected on a monitor TV and monitored.

2. 发明专利

JPH08214388A VIDEO MONITORING SYSTEM 失效
公开(公告)号：JPH08214388A
公开(公告)日：1996-08-20
申请号：JP1524895
申请日：1995-02-01
申请人： YAGI ANTENNA
发明人： SAWAI TAKETOMO , AKIYAMA TAKAO , NISHIZAWA TAKAHIKO , SHIGA MICHINORI
IPC分类号： H04N7/18 , H04L12/44 , H04Q9/00
摘要： PURPOSE: To make an equipment installation space inside an EPS (electric pipe space) small, to turn the network of respective monitoring cameras to a tree-like network similar to a CATV, to simplify cable wiring, to simplify construction and to build a system with improved extendability. CONSTITUTION: In this video monitoring system using a broad band LAN system or the like, the monitoring cameras 1a-1e are respectively installed in plural monitoring places, modulators 2a-2e are installed near the monitoring cameras 1a-1e, connection to a power unit 6 inside the EPS 5 is performed through coaxial cables 4a-4c and the tree-like network is constituted. Then, by the coaxial cables 4a-4c, monitoring video signals outputted from the modulators 2a-2e are transmitted and power to the monitoring cameras 1a-1e and the modulators 2a-2e is supplied.

3. 发明专利

JPH11341463A VIDEO SIGNAL CHANGEOVER DEVICE 失效
公开(公告)号：JPH11341463A
公开(公告)日：1999-12-10
申请号：JP14778198
申请日：1998-05-28
申请人： YAGI ANTENNA
发明人： NISHIZAWA TAKAHIKO , SHIGA MICHINORI , HASHINO KATSUMI , SAWAI TAKETOMO
IPC分类号： H04N7/08 , H04N7/081 , H04N7/16 , H04N21/2365 , H04N21/438
摘要： PROBLEM TO BE SOLVED: To provide the video signal changeover device that is miniaturized and realized with a reduced cost and can change channels. SOLUTION: Video signals of a plurality of channels(CH) such as 16 channels (CHA=CHP) of video signals are multiplexed and the multiplexed signal is transmitted through a transmission line 11 of the frequency division multiplex system such as a CATV system. The video signals of the channels CHA-CHP sent through the transmission line 11 are fed to a demodulator 13, where the signals are demodulated and the demodulated signal is fed to a frame switcher 14. The frame switcher 14 provides an output of a vertical synchronizing signal (VD) and a channel switching signal (frame number) of the received video signal to the demodulator 13 to designate a demodulated channel. Furthermore, the frame switcher 14 selects the video signal demodulated by the demodulator 13 in the unit of frames and outputs the selected signal to a VTR 15, on which the signal is recorded. Moreover, a reproduced image on the VTR 15 is fed to a monitor TV 16 via the frame switcher 14.

4. 发明专利

JP2000232637A CAMERA VIDEO IMAGE TRANSMISSION SYSTEM 失效
公开(公告)号：JP2000232637A
公开(公告)日：2000-08-22
申请号：JP3106699
申请日：1999-02-09
申请人： YAGI ANTENNA
发明人： NAKANO KOICHIRO , SHIGA MICHINORI , SAWAI TAKETOMO , NISHIZAWA TAKAHIKO
IPC分类号： H04N7/18 , H04J1/00
摘要： PROBLEM TO BE SOLVED: To provide a camera video image transmission system that can prevent production of a switching noise at a low cost. SOLUTION: A center device 30 uses a modulator 36 to modulate a synchronizing signal from a synchronizing signal generator 35 with a carrier frequency fs, outputs the modulated signal to a down link of a 2-way transmission line 24 and distributes the signal to monitor cameras 21a, 21b,... Two-way filters and demodulators 40a, 40b demodulate the distributed synchronizing signal. The monitor cameras 21a, 21b,... output a video signal synchronously with the synchronizing signal to modulators 22a, 22b,..., which modulate the video signal with carrier frequencies f1, f2,... and the modulated signal is outputted to an up link of the 2-way transmission line 24 and fed to the center device 30. A 2-way filter 31 extracts the received video signal in the center device 30 and demodulators 33a, 33b demodulate the extracted video signal while selecting the signal for each prescribed time on the basis of the synchronizing signal from the synchronizing signal generator 35 and the monitor TVs 34a, 34b display the demodulated signal.

5. 发明专利

JPH08214287A VIDEO MONITORING SYSTEM 失效
公开(公告)号：JPH08214287A
公开(公告)日：1996-08-20
申请号：JP1791895
申请日：1995-02-06
申请人： YAGI ANTENNA
发明人： SAWAI TAKETOMO , AKIYAMA TAKAO , NISHIZAWA TAKAHIKO , SHIGA MICHINORI
IPC分类号： H04N7/18 , G08B21/00 , G08B25/00 , H04L12/28
摘要： PURPOSE: To construct a system by the use of a main line coaxial cable even in the case of a large system. CONSTITUTION: Monitor cameras 1a, 1b are respectively arranged on monitoring places and modulators 2a, 2b are respectively arranged in the vicinity of the cameras 1a, 1b. Video signals photographed by the cameras 1a, 1b are modulated by the modulators 2a, 2b and inputted to a coaxial cable 4 by respectively branches 3a, 3b as high frequency video signals for channels A, B and frequency- multiplexed signal is transmitted and inputted to an intermediate converter 6 built in an EPS 5. The converter 6 selects a signal of either one of the channels A, B, converts the frequency of the signal into an optional channel C and transmits the frequency-converted signal to a monitor room or the like by a branch 7 through a main line coaxial cable 8. In the monitor room, the video signal of the channel A or B sent from the converter 6 through the cable 8 is demodulated and the demodulated picture is displayed on a monitor TV to monitor it.

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