JPH0229076A - Frequency switching type power synchronizing television system - Google Patents
Frequency switching type power synchronizing television systemInfo
- Publication number
- JPH0229076A JPH0229076A JP17942588A JP17942588A JPH0229076A JP H0229076 A JPH0229076 A JP H0229076A JP 17942588 A JP17942588 A JP 17942588A JP 17942588 A JP17942588 A JP 17942588A JP H0229076 A JPH0229076 A JP H0229076A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- power
- frequency
- power supply
- synchronization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000284 extract Substances 0.000 claims abstract description 4
- 230000001360 synchronised effect Effects 0.000 claims description 15
- 238000000926 separation method Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 12
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Landscapes
- Synchronizing For Television (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は商用電源から電源周波数成分を抽出して同期を
かけることが可能な周波数切替形電源同期テレビジョン
方式に関する９
〔従来の技、術〕
第２図は従来の電源同期テレビジョン（以下ＴＶ）方式
の一例を示すブロック図で、商用電源入力端子１．変圧
回路２．電源周波数分離回路３゜位相比較回路８１位相
同期ループ（以下ＰＬＬ）回路９．電圧制御発振（以下
ＶＣＯ）回路１０゜同期信号発生回路１１および同期信
号出力端子１３から構成されている。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a frequency switching type power synchronized television system that can extract and synchronize power frequency components from a commercial power source. ] FIG. 2 is a block diagram showing an example of a conventional power synchronized television (hereinafter referred to as TV) system, in which a commercial power input terminal 1. Transformer circuit 2. Power frequency separation circuit 3° phase comparison circuit 81 phase locked loop (hereinafter referred to as PLL) circuit 9. The voltage controlled oscillator (hereinafter referred to as VCO) circuit 10 is composed of a synchronizing signal generating circuit 11 and a synchronizing signal output terminal 13.
従来技術の一適用例として、Ｔ’ Ｖカメラ特に工業用
、一般監視用白黒カメラの場合について説明する。As an application example of the prior art, the case of a T'V camera, particularly a monochrome camera for industrial use and general surveillance, will be described.
ＴＶ左カメラ複数台使用する閉回路テレビジョン（以下
ＣＣＴＶ）システムにおいては、ＴＶ左カメラ互の同期
をとる必要があるため各種の外部同期方式がある。中で
も電源同期ＴＶ方式は商用電源から電源周波数成分（６
０Ｈｚ又は５０Ｈｚ）を抽出してこの電源同期信号によ
りＥＩＡ方式（垂直６０Ｈｚ、水平１５．７５ｋＨｚ）
やＣＣＩＲ（垂直５０Ｈｚ、水平１５．６２５ｋＨｚ）
方式のＴＶ左カメラ外部同期をかけることが可能であり
、ＴＶ力°メラに外部同期をかけるための専用信号線（
）４ｉｘ ５ｙｎｃ又はＨＤ／ＶＤ等）を用いることな
く簡単で安価なＣＣＴ Ｖシステムを構築することが可
能である。In a closed circuit television (hereinafter referred to as CCTV) system that uses a plurality of TV left cameras, it is necessary to synchronize the TV left cameras with each other, so there are various external synchronization methods. Among them, the power synchronized TV method uses the power frequency component (6
0Hz or 50Hz) and uses this power synchronization signal to perform EIA method (vertical 60Hz, horizontal 15.75kHz)
and CCIR (vertical 50Hz, horizontal 15.625kHz)
It is possible to externally synchronize the TV left camera of the system, and a dedicated signal line (
) 4ix 5sync or HD/VD), it is possible to construct a simple and inexpensive CCTV system.
上述した従来の電源同期ＴＶ方式のＴＶ右カメラ、電源
の周波数成分とＴＶ右カメラ垂直同期信号とを直接位相
比較しているので、いくつかの問題点がある。In the TV right camera of the conventional power supply synchronized TV system described above, there are several problems because the frequency components of the power supply and the TV right camera vertical synchronization signal are directly compared in phase.
例えば、商用電源周波数が６０Ｈｚの地域では電源から
６０Ｈｚの周波数成分を抽出しており、１／６０秒毎に
システムにＶリセットをかける方式であり、ＥＩＡ方式
のＴＶ右カメラは電源同期がかかるが、ＣＣＩＲ方式の
ＴＶ右カメラは同期がかからず、ＥＩＡ方式専用となる
。逆に、商用電源周波数が５０Ｈｚの地域では電源から
５０Ｈ２の周波数成分を抽出しており、１ 、／ ５０
秒毎にシステムにＶリセットをかける方式て′あり、Ｃ
ＣＩＲ方式のＴＶ右カメラは電源同期がかかるが、ＥＩ
Ａ方式のＴＶ右カメラは同期がかからず、ＣＣＩＲ方式
専用となる。For example, in areas where the commercial power supply frequency is 60Hz, the 60Hz frequency component is extracted from the power supply, and the system is reset to V every 1/60 seconds, and the TV right camera using the EIA method requires power synchronization. , the CCIR system TV right camera is not synchronized and is exclusively for the EIA system. Conversely, in areas where the commercial power supply frequency is 50Hz, the frequency component of 50H2 is extracted from the power supply, which is 1, / 50.
There is a method to reset V to the system every second, C
The CIR system TV right camera requires power synchronization, but the EI
The A-type TV right camera is not synchronized and is exclusively for the CCIR method.
従って、同一のＴＶ方式のカメラを電源周波数の異なる
地域において電源同期をかけて使用することは不可能で
あった。これを解決するための手段としては、商用電源
周波数とＴＶ方式の垂直周波数が同一の地域ではＴＶ右
カメラ電源同期で使用し、周波数の異なる地域ではＴＶ
右カメラ内部同期で使用していたが、簡単で安価な外部
同期システムの構築という上述の電源同期方式による利
点を十分に生かすことができないという欠点がある。Therefore, it has been impossible to synchronize the power supply and use the same TV-type camera in regions with different power supply frequencies. As a means to solve this problem, in areas where the commercial power supply frequency and the vertical frequency of the TV system are the same, use the TV right camera power synchronization, and in areas where the frequency is different, use the TV right camera power supply synchronization.
The right camera was used for internal synchronization, but the drawback is that the advantage of the above-mentioned power synchronization method, which is the construction of a simple and inexpensive external synchronization system, cannot be fully utilized.
本発明の周波数切替形電源同期ＴＶ方式は、少なくとも
３段の異なる分周回路と、これら分周回路の入出力を切
り替える少なくとも２個の切替回路とを備えることを特
徴とする。The frequency switching type power synchronized TV system of the present invention is characterized by comprising at least three stages of different frequency dividing circuits and at least two switching circuits for switching input and output of these frequency dividing circuits.
次に、本発明について第１図を参照し、て説明する。 Next, the present invention will be explained with reference to FIG.
第１図は本発明の周波数切替形電源同期ＴＶ方式の一実
施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the frequency switching type power synchronized TV system of the present invention.
本実施例は従来例の電源同期′「■方式（第２図に図示
）における電源周波数分離回路３の出力を新規に設けた
切替回路Ａ４と、５分周回路５および６分周回路６と、
切替回路Ｂ７とを介して位相比較回路８の一方の入力と
し、また周期信号発生回路１１の出力を新規に設けた分
周回路１２を介して位相比較回路８の他方の入力として
いる点が従来例と異なる。This embodiment uses a switching circuit A4 newly provided with the output of the power frequency separation circuit 3 in the conventional power supply synchronization '■ method (shown in FIG. 2), a divide-by-5 circuit 5, and a divide-by-six circuit 6. ,
Conventionally, the output of the periodic signal generation circuit 11 is used as one input of the phase comparison circuit 8 via the switching circuit B7, and the output of the periodic signal generation circuit 11 is used as the other input of the phase comparison circuit 8 via the newly provided frequency dividing circuit 12. Different from the example.
続いて本実施例の動作について説明する。Next, the operation of this embodiment will be explained.
商用電源入力端子１から５０Ｈｚ （又は６０Ｈｚ）の
交流電源を入力すると、変圧回路２はこれを変圧して低
電圧の交流電圧に変換する。電源周波数分離回路３はこ
の低電圧交流から電源周波数成分を抽出して次段の切替
回路Ａ４に送り出す。When a 50 Hz (or 60 Hz) AC power is input from the commercial power input terminal 1, the transformer circuit 2 transforms this into a low-voltage AC voltage. The power frequency separation circuit 3 extracts the power frequency component from this low voltage alternating current and sends it to the next stage switching circuit A4.
切替回路Ａ４の出力は５分周回路５（又は６分周回路６
）に入力され、上記の電源周波数成分が５分周（又は６
分周）されて１０ Ｈｚ成分の電源同期信号となる。さ
らに、この電源同期信号は切替回路Ｂ７により切り替え
られて位相比較回路８および同期信号発生回路１１に入
力される。The output of switching circuit A4 is divided by 5 frequency divider circuit 5 (or 6 frequency divider circuit 6).
), and the above power supply frequency component is divided by 5 (or 6
frequency divided) to become a 10 Hz component power synchronization signal. Furthermore, this power synchronization signal is switched by a switching circuit B7 and inputted to the phase comparator circuit 8 and the synchronization signal generation circuit 11.
位相比較回路８は電源同期信号（１０Ｈｚ）と後記のＶ
信号（１０Ｈｚ）とを位相比較し、その比較電圧を次段
のＰＬＬ回路９に伝え、■ＣＯ回路１０の発振周波数を
制御する。Ｖ ＣＣ，回路１０からは同期信号発生回路
１１の駆動クロックが出力され、同期信号発生回路１１
からはＶＤ信号（ＥＩＡ方式：６０Ｈｚ、ＣＣＩＲ方式
： ５０Ｈｚ＞その他の各種信号が同期信号出力端子１
３から出力される。このＶＤ信号は分周器２８１２（Ｅ
ＩＡ方式；６分周、ＣＣＩＲ方式：５分周）に入力され
、１０Ｈｚ成分のＶ信号となって位相比較回路８に入力
される。これにより全体として１０’ＨｚのＰＬＬが構
成され、同期信号発生回路１１からの各種信号は商用電
源に同期して出力されることになる。The phase comparator circuit 8 receives the power supply synchronization signal (10Hz) and the V described below.
A signal (10 Hz) is compared in phase, and the comparison voltage is transmitted to the next stage PLL circuit 9 to control the oscillation frequency of the CO circuit 10. V CC, the driving clock for the synchronizing signal generating circuit 11 is output from the circuit 10, and the driving clock for the synchronizing signal generating circuit 11 is outputted from the circuit 10.
From VD signal (EIA method: 60Hz, CCIR method: 50Hz>Other various signals are synchronized signal output terminal 1
Output from 3. This VD signal is applied to the frequency divider 2812 (E
(IA method: frequency divided by 6, CCIR method: frequency divided by 5), and is inputted to the phase comparator circuit 8 as a V signal of 10 Hz component. As a result, a 10'Hz PLL is configured as a whole, and various signals from the synchronization signal generation circuit 11 are output in synchronization with the commercial power supply.
実際に、本発明を適用したＥＩＡ方式ＴＶカメラを５０
Ｈｚの商用電源地区で使用する場合には切替回路Ａ４と
切替回路Ｂ７を破線図示のように５分周回路５側に切り
替えることにより１０Ｈｚの電源同期が可能となり、同
一のＥＩＡ方式ＴＶカメラを６０Ｈｚの商用電源地区Ｙ
、′使用する場合には実線図示のように６分周回路６側
に切り替えることにより同様に１０Ｈｚの電源同期が可
能となる。また、ＣＣＩＲ方弐′１゛Ｖカメラを使用す
る場合には同期信号発生回路１１および５１周回路１２
をＣＣＩＲ用に対応させれば、５ （、） Ｎ Ｚ又は
６０ Ｈｚのどちらの地区においても電源［・Ｉ口τ１
が可能となる。さらに、同期信号発生回路１１および分
周回路１２をＥＩＡ／ＣＣ１Ｒ切替可能な回路構成を取
ることにより、５０ Ｈｚ ／ ６０ ）−（ｚ 、
Ｅ ＩＡ／ＣＣＩＲを問わず、同一カメラで。り）らゆ
る電源周波数、ＴＶ方式に対応し２て電源同期が可能と
なる。In fact, 50 EIA TV cameras to which the present invention was applied were installed.
When used in a Hz commercial power supply district, 10Hz power synchronization is possible by switching switching circuit A4 and switching circuit B7 to the divide-by-5 circuit 5 side as shown by the broken line, and the same EIA TV camera can be used at 60Hz. Commercial power district Y
,' When used, 10 Hz power supply synchronization is similarly possible by switching to the 6 frequency divider circuit 6 side as shown by the solid line. In addition, when using a CCIR 2'1''V camera, the synchronization signal generation circuit 11 and the 51-cycle circuit 12 are
If it is made compatible with CCIR, the power supply [・I port τ1
becomes possible. Furthermore, by adopting a circuit configuration in which the synchronization signal generation circuit 11 and the frequency division circuit 12 can be switched between EIA/CC1R, 50 Hz / 60 ) - (z,
E IA/CCIR, same camera. 2) Compatible with all power supply frequencies and TV systems, and 2) power synchronization is possible.
なお、本実施例ではＴＶカメラを用いて説明したが、池
のＴＶ方式機器（ＴＶモニタ、ＶＴＲスイッチャ等）で
イ、同様に本発明を実施することが可能であり、また５
分周および６分周による１０Ｈｚの電源同期として本発
明を説明１−なか、ｎ分周、ｎ′分周によるｍＨｚ （
ｎ、ｎ′、ｍは任意の整数）の電源同期にも適用可能で
ある。Although this embodiment has been explained using a TV camera, it is possible to implement the present invention in the same way with other TV system equipment (TV monitor, VTR switcher, etc.).
The present invention will be explained as a 10Hz power supply synchronization by frequency division and 6 frequency division.
It is also applicable to power supply synchronization (where n, n', m are arbitrary integers).
以上説明したように本発明は、少くとも３段の異なる分
周回路と、この分周回路を切り替えろ少なくとも２個の
切替回路とを付加することにより、電源周波数の異なる
地域においても、同一のＴ ”Ｖ方式機器に電源同期を
かけることが可能となる効果がある。As explained above, the present invention adds at least three stages of different frequency dividing circuits and at least two switching circuits for switching the frequency dividing circuits, so that even in regions with different power supply frequencies, the same T. ``It has the effect of making it possible to apply power synchronization to V-type devices.
第１図は本発明の周波数切替形電源同期ＴＶ力式の一実
施例を示すブロック図、第２図は従来の電源同期ＴＶ方
式の一例を示すブロック図である、１・・・商用電源入
力端子、２・・・変圧回路、３・・・電１源周波数分離
回路、４，７・・・切替回路Ａ、Ｂ、”’・・・５分周
回路、６・・・６分周回路、８・・・位相比較回路、９
・・・ＰＬＬ回路、１０・・・ＶＣＯ回路、１１同期信
号発生回路、１２・・・分周回路、１３・・・同期信号
出力端子。
代理人 弁理士 内 原 ゛１′ＹFig. 1 is a block diagram showing an embodiment of the frequency switching type power synchronized TV system of the present invention, and Fig. 2 is a block diagram showing an example of a conventional power synchronized TV system. 1...Commercial power supply input Terminal, 2... Transformer circuit, 3... Power source 1 frequency separation circuit, 4, 7... Switching circuits A, B, "'... 5 frequency divider circuit, 6... 6 frequency divider circuit , 8... phase comparison circuit, 9
... PLL circuit, 10 ... VCO circuit, 11 synchronous signal generation circuit, 12 ... frequency dividing circuit, 13 ... synchronous signal output terminal. Agent Patent Attorney Uchihara ゛1'Y
Claims (1)
によりシステムに同期をかける周波数切替形電源同期テ
レビジョン方式であって、少なくとも３段の異なる分周
回路と、これら分周回路の入出力を切り替える少なくと
も２個の切替回路とを備えることを特徴とする周波数切
替形電源同期テレビジョン方式。This is a frequency switching type power synchronized television system that extracts the power frequency component from the commercial power source and synchronizes the system using this frequency component, which has at least three stages of different frequency divider circuits and switches the input and output of these frequency divider circuits. 1. A frequency switching type power synchronized television system comprising at least two switching circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17942588A JPH0229076A (en) | 1988-07-18 | 1988-07-18 | Frequency switching type power synchronizing television system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17942588A JPH0229076A (en) | 1988-07-18 | 1988-07-18 | Frequency switching type power synchronizing television system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0229076A true JPH0229076A (en) | 1990-01-31 |
Family
ID=16065637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17942588A Pending JPH0229076A (en) | 1988-07-18 | 1988-07-18 | Frequency switching type power synchronizing television system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0229076A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5555186A (en) * | 1994-02-15 | 1996-09-10 | Nec Corporation | Projection type liquid crystal display apparatus using multiple polarizing beam splitters |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5816975B2 (en) * | 1975-10-06 | 1983-04-04 | ザ・グリ−ソン・ワ−クス | Large gear manufacturing method and device |
| JPS58163989A (en) * | 1982-03-25 | 1983-09-28 | 東芝テック株式会社 | Synchronous signal generation circuit for crt display controller |
| JPS6182280A (en) * | 1984-05-29 | 1986-04-25 | エルシント リミテツド | Video processing system |
| JPS6316755B2 (en) * | 1981-02-18 | 1988-04-11 | Sharp Kk |
-
1988
- 1988-07-18 JP JP17942588A patent/JPH0229076A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5816975B2 (en) * | 1975-10-06 | 1983-04-04 | ザ・グリ−ソン・ワ−クス | Large gear manufacturing method and device |
| JPS6316755B2 (en) * | 1981-02-18 | 1988-04-11 | Sharp Kk | |
| JPS58163989A (en) * | 1982-03-25 | 1983-09-28 | 東芝テック株式会社 | Synchronous signal generation circuit for crt display controller |
| JPS6182280A (en) * | 1984-05-29 | 1986-04-25 | エルシント リミテツド | Video processing system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5555186A (en) * | 1994-02-15 | 1996-09-10 | Nec Corporation | Projection type liquid crystal display apparatus using multiple polarizing beam splitters |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR20000023126A (en) | External synchronization system using composite synchronization signal, and camera system using the same | |
| JPH0229076A (en) | Frequency switching type power synchronizing television system | |
| JPH0722380B2 (en) | Phase lock circuit for video signal | |
| KR960011230B1 (en) | Synchronization circuit | |
| KR100287783B1 (en) | Cctv camera | |
| KR100468711B1 (en) | External Synchronization Device and Synchronization Method with Automatic Synchronization Mode of Surveillance Camera System | |
| JPH08223444A (en) | External synchronization method for television receiver or the like | |
| JPH07250338A (en) | External synchronizing method for video camera | |
| JP4178684B2 (en) | External synchronization system and camera system using the same | |
| JP3515172B2 (en) | TV camera device | |
| JPH0418306Y2 (en) | ||
| JP3723514B2 (en) | Signal generating circuit and video camera having the same | |
| JPH0429071B2 (en) | ||
| JPH05130446A (en) | Monitor camera apparatus | |
| JPS62108695A (en) | Coupling system for external synchronization of color television camera | |
| JPS581595B2 (en) | Synchronous coupling method of PAL synchronization signal generator | |
| JPS637078B2 (en) | ||
| JPH0898197A (en) | Image pickup device | |
| JPH0965354A (en) | Phase matching method for chrominance subcarrier signal | |
| JPH05328167A (en) | Power supply synchronization system for 50hz | |
| JPS6218871A (en) | Phase synchronizing device | |
| JPH08116548A (en) | Synchronous circuit device for external synchronous camera | |
| JPH02249392A (en) | Clock generator | |
| JPH03151768A (en) | Synchronizing system for television camera | |
| JPH0482481A (en) | Clock recovery device |