JPS63196175A - Monitoring camera apparatus - Google Patents
Monitoring camera apparatusInfo
- Publication number
- JPS63196175A JPS63196175A JP2883387A JP2883387A JPS63196175A JP S63196175 A JPS63196175 A JP S63196175A JP 2883387 A JP2883387 A JP 2883387A JP 2883387 A JP2883387 A JP 2883387A JP S63196175 A JPS63196175 A JP S63196175A
- Authority
- JP
- Japan
- Prior art keywords
- frame pulse
- field
- signal
- pulse
- phase comparator
- 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
- 238000012544 monitoring process Methods 0.000 title 1
- 230000001360 synchronised effect Effects 0.000 abstract description 5
- 230000010355 oscillation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、外部同期Ａタイプの監視カメラ装置に関する
。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an externally synchronized A type surveillance camera device.
従来の技術
第３図は従来のフィールド信号で同期するテレビカメラ
装置の構成を示している。すなわち、外部からの基準信
号としてはイのようなフィールド同期パルスを用い、こ
れをもって内部同期信号を口のように制御し、カメラを
制御するようにしたものである。BACKGROUND OF THE INVENTION FIG. 3 shows the configuration of a conventional television camera device synchronized with field signals. That is, a field synchronization pulse as shown in A is used as an external reference signal, and this is used to control an internal synchronization signal as shown in FIG. 1 to control the camera.
発明が解決しようとする問題点
しかしながら、上記従来の外部同期では外部の基準信号
がフィールドパルスであるため、偶数フィールドと奇数
フィールドが同期した場合、第３図のＡのような通常に
対してＢのように水平同期位相が１８０°ずれるという
問題があった。Problems to be Solved by the Invention However, in the conventional external synchronization described above, the external reference signal is a field pulse, so when the even and odd fields are synchronized, B There was a problem in that the horizontal synchronization phase was shifted by 180 degrees.
本発明はこのような従来の問題を解決するものであり、
水平同期が位相誤差をなくすことが出来る優れた外部同
期機能付の監視カメラ装置を提供することを目的とする
ものである。The present invention solves these conventional problems,
It is an object of the present invention to provide a surveillance camera device with an excellent external synchronization function in which horizontal synchronization can eliminate phase errors.
問題点を解決するための手段
本発明は上記目的を達成するために、外部信号としてフ
レームパルスを用い、位相比較器への帰Ｅｌ！ハルスも
フレームパルス発生器を介しておこなうようにしたもの
である。Means for Solving the Problems In order to achieve the above object, the present invention uses a frame pulse as an external signal and returns El! to the phase comparator. Hals is also performed via a frame pulse generator.
作用
したがって本発明によれば、外部入力に対してフレーム
単位の同期がとれるので水平同期位相がほぼ一致すると
いう効果を有する。Therefore, according to the present invention, since frame-by-frame synchronization can be achieved with respect to external input, there is an effect that the horizontal synchronization phases almost match.
実施例
第２図は本発明の一実施例の構成を示すものである。１
は位相比較器であり、電圧制御発振器２に入力されてい
る。３は同期信号発生器であシフレームパルス発生器４
に入力される。Embodiment FIG. 2 shows the configuration of an embodiment of the present invention. 1
is a phase comparator, which is input to the voltage controlled oscillator 2. 3 is a synchronization signal generator and frame pulse generator 4
is input.
次に上記実施例の動作について説明する。Next, the operation of the above embodiment will be explained.
まずｖｌの外部からのフレームパルスを位相比較器１に
入力し、フレームパルス発生器４の出力と比較しその差
分てもって電圧制御発振器２の発振周波数を可変するよ
うにしている。同期信号発生器３では発振器２の出力に
もとすき、フィールドパルスｖ２をフレームパルス発生
器４に加えフィールドパルス゛Ｖ ２／を位相比較器１
に入力する。First, an external frame pulse of vl is input to the phase comparator 1, and compared with the output of the frame pulse generator 4, and the oscillation frequency of the voltage controlled oscillator 2 is varied based on the difference. In the synchronizing signal generator 3, the output of the oscillator 2 is also used, and the field pulse v2 is added to the frame pulse generator 4, and the field pulse ゛V2/ is sent to the phase comparator 1.
Enter.
したがって、外部フレームパルス信号と内部信号が同期
するため、単一の信号のみでフィールドまで同期を表わ
すことができ、第１図のＡのような第１、第２フイール
ドという形になる。Therefore, since the external frame pulse signal and the internal signal are synchronized, it is possible to express synchronization down to the field with only a single signal, resulting in the first and second fields as shown in A in FIG.
発明の効果
本発明は上記実施例より明らかなように単一の信号のみ
で、フィールドまで同期がとれるので、映像スイッチャ
−などで映像を切換えた場合でもビデオモニタ上の画像
が乱れないという利点を有する。Effects of the Invention As is clear from the above embodiments, the present invention has the advantage that it is possible to synchronize up to the field with only a single signal, so that the image on the video monitor will not be distorted even if the video is switched using a video switcher or the like. have
第１図は本発明の一実施例における監視カメラ装置の構
成図、第２図は同概略プロンク図、第３図は従来のフィ
ールド同期装置のブロック図である。
１・・・位相比較器、２・・・電圧制御発振器、３・・
・同期信号発信器、４・・・フレームパルス発生器。FIG. 1 is a block diagram of a surveillance camera device according to an embodiment of the present invention, FIG. 2 is a schematic diagram thereof, and FIG. 3 is a block diagram of a conventional field synchronization device. 1... Phase comparator, 2... Voltage controlled oscillator, 3...
- Synchronization signal generator, 4... frame pulse generator.
Claims (1)
力をフレームパルスとすると共に上記位相比較器への帰
還をフレームパルス発生器を介すようにしたことを特徴
とする監視カメラ装置。A surveillance camera device characterized in that an external input to a phase comparator in a PLL circuit that determines a synchronization signal is a frame pulse, and feedback to the phase comparator is passed through a frame pulse generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2883387A JPS63196175A (en) | 1987-02-10 | 1987-02-10 | Monitoring camera apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2883387A JPS63196175A (en) | 1987-02-10 | 1987-02-10 | Monitoring camera apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63196175A true JPS63196175A (en) | 1988-08-15 |
Family
ID=12259380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2883387A Pending JPS63196175A (en) | 1987-02-10 | 1987-02-10 | Monitoring camera apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63196175A (en) |
-
1987
- 1987-02-10 JP JP2883387A patent/JPS63196175A/en active Pending
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