JPS63111075U - - Google Patents
Info
- Publication number
- JPS63111075U JPS63111075U JP138087U JP138087U JPS63111075U JP S63111075 U JPS63111075 U JP S63111075U JP 138087 U JP138087 U JP 138087U JP 138087 U JP138087 U JP 138087U JP S63111075 U JPS63111075 U JP S63111075U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- video
- detection circuit
- unlock
- frequency synthesizer
- 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
- 238000001514 detection method Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Synchronizing For Television (AREA)
- Facsimile Transmission Control (AREA)
Description
第１，２図は本考案の一実施例としてのビデオ
同期周波数自動判別制御装置を示すもので、第１
図はその全体構成を示すブロツク図、第２図はそ
の周波数シスセサイザの構成を示すブロツク図で
あり、第３図は従来のビデオターミナルとビデオ
ハードコピー装置との結線状態を説明するための
ブロツク図である。
図において、１……ビデオターミナル、２……
ビデオハードコピー装置、３……周波数シンセサ
イザ、４……位相比較器、５……ローパスフイル
タ、６……電圧制御発振器、７……可変分周器と
しての１／Ｎ分周器、８……アンロツク状態検出
ライン、９，１０……出力ライン、１１……フイ
ードバツクライン、１２……制御回路、１３……
制御信号ライン。なお、図中、同一符号は同一、
又は相当部分を示す。
Figures 1 and 2 show a video synchronization frequency automatic discrimination control device as an embodiment of the present invention.
Figure 2 is a block diagram showing the overall configuration, Figure 2 is a block diagram showing the configuration of its frequency synthesizer, and Figure 3 is a block diagram illustrating the connection state between a conventional video terminal and a video hard copy device. It is. In the figure, 1... video terminal, 2...
Video hardcopy device, 3... Frequency synthesizer, 4... Phase comparator, 5... Low pass filter, 6... Voltage controlled oscillator, 7... 1/N frequency divider as variable frequency divider, 8... Unlock state detection line, 9, 10... Output line, 11... Feedback line, 12... Control circuit, 13...
control signal line. In addition, in the figure, the same reference numerals are the same,
or a corresponding portion.
Claims (1)
ビデオハードコピー装置にＰＬＬ回路を用いた周
波数シンセサイザをそなえ、上記同期信号の周波
数が所定値以上変わつたときにアンロツク状態で
あることを検出するアンロツク検出回路が上記ビ
デオハードコピー装置側に設けられるとともに、
上記アンロツク検出回路によつてアンロツク状態
であることが検出されると上記周波数シンセサイ
ザの可変分周器へ分周率を変えるための制御信号
を出力する制御回路が設けられたことを特徴とす
る、ビデオ同期周波数自動判別制御装置。 (2) 上記アンロツク検出回路が上記周波数シン
セサイザの位相比較器である、実用新案登録請求
の範囲第１項記載のビデオ同期周波数自動判別制
御装置。[Claims for Utility Model Registration] (1) A video hard copy device that receives a synchronizing signal from a video terminal is equipped with a frequency synthesizer using a PLL circuit, and when the frequency of the synchronizing signal changes by more than a predetermined value, the device is in an unlocked state. An unlock detection circuit is provided on the video hard copy device side for detecting that
A control circuit is provided for outputting a control signal for changing the frequency division ratio to the variable frequency divider of the frequency synthesizer when the unlock state is detected by the unlock detection circuit. Video synchronous frequency automatic discrimination control device. (2) The video synchronous frequency automatic discrimination control device according to claim 1, wherein the unlock detection circuit is a phase comparator of the frequency synthesizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP138087U JPS63111075U (en) | 1987-01-07 | 1987-01-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP138087U JPS63111075U (en) | 1987-01-07 | 1987-01-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63111075U true JPS63111075U (en) | 1988-07-16 |
Family
ID=30779238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP138087U Pending JPS63111075U (en) | 1987-01-07 | 1987-01-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63111075U (en) |
-
1987
- 1987-01-07 JP JP138087U patent/JPS63111075U/ja active Pending