JPH02261286A - Fault signal replacement device in slave screen display - Google Patents
Fault signal replacement device in slave screen displayInfo
- Publication number
- JPH02261286A JPH02261286A JP8383789A JP8383789A JPH02261286A JP H02261286 A JPH02261286 A JP H02261286A JP 8383789 A JP8383789 A JP 8383789A JP 8383789 A JP8383789 A JP 8383789A JP H02261286 A JPH02261286 A JP H02261286A
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- circuit
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- video signal
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- 238000001514 detection method Methods 0.000 claims abstract description 27
- 230000002159 abnormal effect Effects 0.000 claims description 34
- 230000005856 abnormality Effects 0.000 claims description 25
- 238000007493 shaping process Methods 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
子画面表示機能を有するＶＴＲやテレビジョン受像機に
おいて、親機または子機の両入力映像信号が異常信号で
ある場合に置換映像信号に置換し、同置換映像信号を子
画面表示回路の入力映像信号にすることに関する。[Detailed Description of the Invention] [Industrial Application Field] In a VTR or television receiver having a small screen display function, when both the input video signals of the base unit or the slave unit are abnormal signals, they are replaced with a replacement video signal. The present invention also relates to using the substituted video signal as an input video signal of a sub-screen display circuit.
従来の子画面表示機能を有するＶＴＲやテレビジョン受
像機においては、第３図に示す如く親機の入力映像信号
を同期分離し、同分離した同期信号の周波数が正常信号
か異常信号であるかを判別し、異常信号の場合には異常
検出信号を発生させ、同異常検出信号にてマイクロプロ
セッサを正常モードから異常モードに変換し、変換信号
に対応したインターフェイス回路の出力信号にて置換映
像信号を供給し子画面表示回路の入力を置換映像信号に
置換させていた。In conventional VTRs and television receivers that have a sub-screen display function, the input video signal of the base unit is synchronously separated as shown in Figure 3, and it is determined whether the frequency of the separated sync signal is a normal signal or an abnormal signal. If it is an abnormal signal, it generates an abnormality detection signal, converts the microprocessor from normal mode to abnormal mode using the abnormality detection signal, and replaces the video signal with the output signal of the interface circuit corresponding to the conversion signal. was supplied to replace the input of the sub-screen display circuit with a replacement video signal.
しかし子機の入力映像信号については何ら画像処理せず
に子画面表示回路に入力していたため親機の入力映像信
号が異常信号例えば無信号状態になると置換映像信号例
えばブルーパック信号に置換され無信号によるザラザラ
ノイズは画面上に現れないとしても、一方子機の入力映
像信号が異常信号例えば無信号状態になるとザラザラノ
イズが画面上に現れ画質を損なう等の欠点があった。However, since the input video signal of the slave unit is input to the slave screen display circuit without any image processing, if the input video signal of the base unit becomes an abnormal signal, such as a no-signal state, it is replaced with a replacement video signal, such as a blue pack signal, and the signal is not displayed. Even if the grainy noise caused by the signal does not appear on the screen, if the input video signal of the slave device becomes an abnormal signal, such as a no-signal state, grainy noise appears on the screen, degrading the image quality.
本発明は、親機又は子機の両入力映像信号が異常信号に
なると自動的に置換映像信号に置換された信号を子画面
表示回路に供給する子画面表示における異常信号置換装
置を提供しようとするものである。The present invention aims to provide an abnormal signal replacement device in a child screen display that automatically supplies a signal replaced with a replacement video signal to a child screen display circuit when both input video signals of a parent device or a child device become abnormal signals. It is something to do.
上記問題を解決するために本発明では、子機の映像信号
範囲のみ子機の入力映像信号に置換される様に自動的に
切換スイッチにて切換る手段と、切換られたａｍまたは
子機の入力映像信号から同期信号を分離する手段と、同
同期信号の周波数変化に対応したＤＣ電圧を発生させる
Ｆ−Ｖ変換器の出力信号と同期信号の周波数が正常範囲
内であるＦ−Ｖ変換器の出力に相当するＤＣ電圧とを比
較するコンパレータ回路と、同同期信号の周波数が正常
範囲外になる場合にはコンパレータ回路の出力に異常検
出信号を発生させる手段と、同異常信号検出パルスを親
機内部のマイクロプロセッサと相互にデータを送受信し
ているインターフェイス回路に供給し、マイクロプロセ
ッサのモードを正常信号モードから異常信号モードに変
換する手段と、同変換する手段よるインターフェイス回
路の出力信号に対応して置換映像信号を供給する手段と
、前記置換映像信号と親機または子機の入力映像信号を
切換スイッチに接続し、同スイッチと子画面表示回路の
入力端子とを接続する手段にて、異常入力映像信号から
置換映像発生回路の映像信号に置換する。In order to solve the above problems, the present invention provides a means for automatically switching using a changeover switch so that only the video signal range of the slave unit is replaced with the input video signal of the slave unit, and A means for separating a synchronization signal from an input video signal, an F-V converter that generates a DC voltage corresponding to a frequency change of the synchronization signal, and an F-V converter in which the output signal of the F-V converter and the frequency of the synchronization signal are within a normal range. A comparator circuit that compares the output of the synchronous signal with a DC voltage corresponding to the output of the synchronous signal, a means for generating an abnormality detection signal at the output of the comparator circuit when the frequency of the synchronous signal is out of the normal range, and a means for generating an abnormality detection pulse at the output of the comparator circuit. A means for supplying data to the interface circuit that exchanges data with the microprocessor inside the machine and converting the mode of the microprocessor from normal signal mode to abnormal signal mode, and corresponds to the output signal of the interface circuit by the means for converting the mode. and means for connecting the replacement video signal and the input video signal of the parent device or the slave device to a changeover switch, and connecting the switch to an input terminal of the child screen display circuit, The abnormal input video signal is replaced with the video signal of the replacement video generation circuit.
また、親機と子機の入力映像信号を独立に同期信号を分
離する手段と、同同期信号の周波数変化に対応したＤＣ
電圧を発生させるＦ−Ｖ変換器の出力信号と同期信号の
周波数が正常範囲内であるＦ−Ｖ変換器の出力に相当す
るＤＣ電圧とを比較するコンパレータ回ＩＩＩ！、＝、
同同期信号の周波数が正常範囲外になる場合には異常検
出信号を発生させる手段と、同異常検出信号を親機内部
のマイクロプロセッサと相互にデータを送受信している
インターフェイス回路に供給し、マイクロプロセッサの
モードを正常信号モードから異常信号モードに変換する
手段と、同変換する手段よるインターフェイス回路の出
力信号に対応して置換映像信号を供給する手段と、前記
置換映像信号と親機または子機の入力映像信号を切換ス
イッチに接続し、同スイッチと子画面表示回路の入力端
子とを接続する手段にて、異常入力映像信号から置換映
像発生回路の映像信号に置換する。In addition, there is a means to independently separate the synchronization signal from the input video signals of the master unit and slave unit, and a DC
Comparator time III to compare the output signal of the F-V converter that generates the voltage with the DC voltage corresponding to the output of the F-V converter whose synchronizing signal frequency is within the normal range! ,=,
A means for generating an abnormality detection signal when the frequency of the synchronization signal is outside the normal range, and a means for supplying the abnormality detection signal to an interface circuit that exchanges data with the microprocessor inside the base unit. means for converting the mode of the processor from normal signal mode to abnormal signal mode; means for supplying a replacement video signal in response to the output signal of the interface circuit by the means for converting; The abnormal input video signal is replaced by the video signal of the replacement video generation circuit by means of connecting the input video signal to a changeover switch and connecting the switch to the input terminal of the sub-screen display circuit.
以上のように構成した本発明による子画面表示における
異常信号置換装置では、子機の映像信号範囲をのみ子機
の入力映像信号になる様に自動的に切換スイッチにて切
換えて、親機又は子機の入力映像信号から同期分離し同
期信号のみを取り出し、同同期信号の周波数変化に対応
した電圧を発生させるＦ−Ｖ変換器の出力信号と同期信
号の周波数が正常範囲内であるＦ−Ｖ変換器の出力に相
当するＤＣ電圧とを比較するコンパレータ回路にて、同
同期信号の周波数が正常範囲外になる場合には異常検出
信号を発生させる。In the abnormal signal replacement device for sub-screen display according to the present invention configured as described above, the video signal range of the slave unit is automatically switched using the changeover switch so that only the input video signal of the slave unit is used, and The output signal of the F-V converter, which separates the synchronization from the input video signal of the slave unit, extracts only the synchronization signal, and generates a voltage corresponding to the frequency change of the same synchronization signal, and the frequency of the synchronization signal are within the normal range. A comparator circuit that compares the DC voltage corresponding to the output of the V converter generates an abnormality detection signal when the frequency of the synchronization signal is outside the normal range.
同異常検出信号にて親機内部のマイクロプロセッサと相
互にデータを送受信しているインターフェイス回路に供
給し、マイクロプロセッサのモードを正常信号モードか
ら異常信号モードに変換させ、同変換する手段よるイン
ターフェイス回路の出力信号に対応して置換映像信号を
発生させ出力端子に出力させるか、または置換映像信号
を常時発生しておき、スフイチを切換えることにより置
換映像信号を出力端子に出力させるようにしてもよい。An interface circuit that supplies the abnormality detection signal to an interface circuit that exchanges data with the microprocessor inside the base unit, converts the mode of the microprocessor from normal signal mode to abnormal signal mode, and performs the same conversion. A replacement video signal may be generated in response to the output signal and output to the output terminal, or the replacement video signal may be generated all the time and the replacement video signal may be output to the output terminal by switching the switch. .
前記置換信号と親機または子機の入力映像信号を切換ス
イッチに接続し子画面表示回路に入力させ、親機または
子機の両入力映像信号が異常信号の場合には自動的に置
換映像信号に置換する。The replacement signal and the input video signal of the base unit or slave unit are connected to a changeover switch and input to the child screen display circuit, and if both input video signals of the base unit or slave unit are abnormal signals, the replacement video signal is automatically changed. Replace with
また、親機と子機の入力映像信号を独立に同期信号を分
離し、同期信号のみを取り出し、同同期信号の周波数変
化に対応した電圧を発生させるＦ−■変換器の出力信号
と同期信号の周波数が正常範囲内であるＦ−Ｖ変換器の
出力に相当するＤＣ電圧とを比較するコンパレータ回路
にて、同同期信号の周波数が正常範囲外になる場合には
異常検出信号を発生させる。In addition, the synchronization signal is separated from the input video signals of the base unit and slave unit independently, and only the synchronization signal is taken out, and the output signal and synchronization signal of the F-■ converter that generates a voltage corresponding to the frequency change of the same synchronization signal. A comparator circuit that compares the frequency of the synchronizing signal with the DC voltage corresponding to the output of the F-V converter within the normal range generates an abnormality detection signal when the frequency of the synchronizing signal falls outside the normal range.
同異常検出信号にて親機内部のマイクロプロセッサと相
互にデータを送受信しているインターフェイス回路に供
給し、マイクロプロセッサのモードを正常信号モードか
ら異常信号モードに変換させ、同変換する手段よるイン
ターフェイス回路の出力信号に対応して置換映像信号を
発生させ出力端子に出力させるか、または前記同様に置
換映像信号を出力端子に出力させるようにしてもよい。An interface circuit that supplies the abnormality detection signal to an interface circuit that exchanges data with the microprocessor inside the base unit, converts the mode of the microprocessor from normal signal mode to abnormal signal mode, and performs the same conversion. A replacement video signal may be generated in response to the output signal and outputted to the output terminal, or the replacement video signal may be outputted to the output terminal in the same manner as described above.
前記置換信号と親機または子機の入力映像信号を切換ス
イッチに接続し子画面表示回路に入力させ、親機または
子機の両入力映像信号が異常信号の場合には自動的に置
換映像信号に置換する。The replacement signal and the input video signal of the base unit or slave unit are connected to a changeover switch and input to the child screen display circuit, and if both input video signals of the base unit or slave unit are abnormal signals, the replacement video signal is automatically changed. Replace with
以下、本発明による子画面表示における異常信号置換装
置について図面を参照して説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An abnormal signal replacement device for small screen display according to the present invention will be described below with reference to the drawings.
第１図の本発明の第１実施例において、親機の入力映像
信号は入力端子ｌより電子式切換スイッチＳＷＩを経由
し子画面表示回路３の入力端子３ａと切換スイッチＳ
Ｗ ３− ａに接続されている。In the first embodiment of the present invention shown in FIG. 1, the input video signal of the base unit is inputted from the input terminal 1 via the electronic changeover switch SWI, and then sent to the input terminal 3a of the sub-screen display circuit 3 and the changeover switch S.
Connected to W3-a.
子機の入力映像信号は入力端子２より切換スイッチＳＷ
２を経由し子画面表示回路３の入力端子３ｂと切換スイ
ッチ５Ｗ３−ｂに接続させている。The input video signal of the slave unit is input from input terminal 2 by switching switch SW.
2 to the input terminal 3b of the small screen display circuit 3 and the changeover switch 5W3-b.
切換スイッチ５Ｗ３−ａ、ｂに接続された親機、子機の
人力映像信号はインターフェイス回路９ａより画面上の
子機の挿入位置に対応しているゲート信号により切換ス
イッチＳＷ３を切換えて、同期信号分離回路５の入力端
子５ａに供給せしめ、同期分離回路５の出力端子５ｂよ
り同期信号を出力する。The human input video signals of the master unit and the slave unit connected to the changeover switches 5W3-a and 5W3-b are transmitted from the interface circuit 9a by a gate signal corresponding to the insertion position of the slave unit on the screen, and the changeover switch SW3 is switched, and the synchronization signal is output. The synchronization signal is supplied to the input terminal 5a of the separation circuit 5, and the synchronization signal is output from the output terminal 5b of the synchronization separation circuit 5.
同同期信号をＦ−Ｖ変換器６の入力端子６ａに接続し同
期信号の周波数の変化に対応したＤＣ電圧をコンパレー
タ７の入力端子７ａに供給し、同期信号の周波数変化が
正常範囲外の場合には異常検出信号を発生させ出力端子
７ｂより異常検出信号成形回路８の入力端子８ａに接続
し、成形された異常検出信号は出力端子８ｂよりインタ
ーフェイス回路９ａに供給し、マイクロプロセッサを正
常信号モードから異常信号モードに変換する。The same synchronization signal is connected to the input terminal 6a of the F-V converter 6, and a DC voltage corresponding to the change in the frequency of the synchronization signal is supplied to the input terminal 7a of the comparator 7, and when the frequency change of the synchronization signal is outside the normal range. generates an abnormality detection signal, connects the output terminal 7b to the input terminal 8a of the abnormality detection signal shaping circuit 8, supplies the shaped abnormality detection signal to the interface circuit 9a from the output terminal 8b, and puts the microprocessor into the normal signal mode. to abnormal signal mode.
同変換する手段によるインターフェイス回路の出力信号
９ｃまたは９ｄにて切換スイッチＳＷＩ、ＳＷ２を置換
映像発生回路側５ＷＩ−ｂ、５Ｗ２−すに切換るともに
置換映像信号発生回路の４ｂ、４Ｃに供給し、置換映像
信号を５ＷＩ−ｂ、５Ｗ２−ｂに供給する。Using the output signal 9c or 9d of the interface circuit by the converting means, switch the changeover switches SWI, SW2 to the replacement video signal generation circuit side 5WI-b, 5W2-, and supply it to the replacement video signal generation circuit 4b, 4C; The replacement video signal is supplied to 5WI-b and 5W2-b.
親機または子機のいずれか一方または両方共異常信号の
場合に異常入力映像信号から置換映像信号に置換する。If either or both of the parent device and the slave device have an abnormal signal, the abnormal input video signal is replaced with a replacement video signal.
第２図の第二実施例は、親機の入力映像信号は入力端子
ｌより切換スイッチＳＷＩを経由し子画面表示回路３の
入力端子３ａと同期分離回路５の入力端子５ａに接続さ
れている。子機の入力映像信号は入力端子２より切換ス
イッチＳＷ２を経由し子画面表示回路３０入力端子３ｂ
と同期分離回路１１の入力端子１１ａに接続させている
。In the second embodiment shown in FIG. 2, the input video signal of the main unit is connected from the input terminal 1 to the input terminal 3a of the sub-screen display circuit 3 and the input terminal 5a of the synchronization separation circuit 5 via the changeover switch SWI. . The input video signal of the slave device is input from the input terminal 2 via the changeover switch SW2 to the slave screen display circuit 30 input terminal 3b.
and the input terminal 11a of the synchronous separation circuit 11.
親機と子機それぞれの同期信号を同期分離回路１１．１
５の出力端子１１ｂ、１５ｂより出力し、同同期信号を
Ｆ−Ｖ変換器１２．１６の入力端子１２ａ、１６ａに接
続し同期信号の周波数の変化に対応したＤＣ電圧をコン
パレータ１３．１７の入力端子１３ａ、１７ａに供給し
、同期信号の周波数変化が正常範囲外の場合には異常検
出信号を発生させ出力端子１３ｂ、１７ｂより異常検出
信号成形回路１４．１８の入力端子１４ａ、１８ａに接
続し、成形された異常検出信号は出力端子１４ｂ、１８
ｂよりインターフェイス回路９ａ、９ｅに供給され、マ
イクロプロセッサを正常信号モードから異常信号モード
に変換する。Synchronization separation circuit 11.1 for synchronizing signals of the parent unit and slave unit
The synchronizing signal is output from the output terminals 11b and 15b of the F-V converter 12.16, and the DC voltage corresponding to the change in the frequency of the synchronizing signal is input to the comparator 13.17. It is supplied to terminals 13a and 17a, and when the frequency change of the synchronizing signal is outside the normal range, an abnormality detection signal is generated and the output terminals 13b and 17b are connected to input terminals 14a and 18a of abnormality detection signal shaping circuit 14.18. , the shaped abnormality detection signal is output to the output terminals 14b and 18.
b to interface circuits 9a and 9e, which convert the microprocessor from normal signal mode to abnormal signal mode.
同変換する手段によるインターフェイス回路の出力信号
９ｃまたは９ｄにて切換スイッチＳＷｌを置換映像発生
回路側５ＷＩ−ｂ、５Ｗ２−ｂに切換るともに置換映像
信号発生回路の４ｂ、４に供給し、置換映像信号を５Ｗ
Ｉ−ｂ、５Ｗ２−ｂに供給する。The output signal 9c or 9d of the interface circuit by the converting means is used to switch the changeover switch SWl to the replacement video signal generation circuit side 5WI-b, 5W2-b, and supply it to the replacement video signal generation circuit 4b, 4. 5W signal
Supply to I-b, 5W2-b.
親機または子機のいずれか一方または両方共異常信号の
場合に異常入力映像信号から置換映像信号に置換する。If either or both of the parent device and the slave device have an abnormal signal, the abnormal input video signal is replaced with a replacement video signal.
以上の実施例からもあきらかなように、本発明の子画面
表示における異常信号置換装置は、親機と子機との両入
力映像信号を一つの画面上に表示さる子画面表示回路に
おいて、親機または子機からの入力映像信号のいずれか
一方または両方共異常信号の場合に異常検出信号を検出
し、同異常検出信号にてマイクロプロセッサを正常信号
モードから異常信号モードに変換し、異常入力映像信号
例えば無信号から例えばブルーバック信号の如き置換映
像信に置換するので無信号によるザラザラノイズが画面
上に現れない見易い画像が得られる。As is clear from the above embodiments, the abnormal signal replacement device for child screen display of the present invention can be used in a child screen display circuit that displays both input video signals from the parent device and the child device on one screen. If either or both of the input video signals from the device or the slave device are abnormal signals, an abnormality detection signal is detected, and the abnormality detection signal converts the microprocessor from normal signal mode to abnormal signal mode, and the abnormality input is detected. Since a video signal such as a no signal is replaced with a replacement video signal such as a blue back signal, an easy-to-see image without grainy noise caused by no signal appearing on the screen can be obtained.
第１図及び第２図は本発明の詳細な説明するための子画
面表示における異常信号置換装置のブロックダイアグラ
ム、第３図は従来の子画面表示における異常信号置換装
置のブロックダイアグラムである。
図中、１は親機入力映像信号の入力端子、２は子機入力
映像信号の入力端子、ＳＷＩは切換スイッチ、ＳＷ２は
切換スイッチ、３は子画面表示回路、３ａは親機入力映
像信号の入力端子、３ｂは子機入力映像信号の入力端子
、ＳＷ３は切換スイッチ、４は置換映像発生回路、４ａ
は出力端子、４ｂは入力端子、４Ｃは入力端子、５．１
１．１５は同期信号分離回路、５ａ、Ｉｌａ、１５ａは
入力端子、５ｂ、ｌｌｂ、１５ｂは出力端子、６１２．
１６はＦ−Ｖ変換器、６ａ、１２ａ、１６ａは入力端子
、６ｂ、１２ｂ、１６ｂは出力端子、７．１３．１７は
コンパレータ、７ａ、１３ａ。
１３ａは入力端子、７ｂ、１３ｂ、１７ｂは出力端子、
８，１４．１８は異状検出信号成形回路、８ａ、１４ａ
、１８ａは入力端子、８ｂ、１４ｂ。
１８は出力端子、９はインタフェース回路、９ａｓ９ｅ
は入力端子、９ｂはゲート信号の出力端子、９ｃは信号
出力端子、９ｄは出力端子、１０はマイクロプロセッサ
である。
特許出願人 株式会社富士通ゼネラル
第１図
第２図1 and 2 are block diagrams of an abnormal signal replacement device in a small screen display for explaining the present invention in detail, and FIG. 3 is a block diagram of a conventional abnormal signal replacement device in a small screen display. In the figure, 1 is an input terminal for the main unit input video signal, 2 is an input terminal for the sub unit input video signal, SWI is a changeover switch, SW2 is a changeover switch, 3 is a child screen display circuit, and 3a is an input terminal for the main unit input video signal. Input terminal, 3b is an input terminal for the slave unit input video signal, SW3 is a changeover switch, 4 is a replacement video generation circuit, 4a
is the output terminal, 4b is the input terminal, 4C is the input terminal, 5.1
1.15 is a synchronizing signal separation circuit, 5a, Ila, 15a are input terminals, 5b, llb, 15b are output terminals, 612.
16 is an F-V converter, 6a, 12a, 16a are input terminals, 6b, 12b, 16b are output terminals, 7.13.17 are comparators, 7a, 13a. 13a is an input terminal, 7b, 13b, 17b are output terminals,
8, 14. 18 is an abnormality detection signal forming circuit, 8a, 14a
, 18a are input terminals, 8b, 14b. 18 is an output terminal, 9 is an interface circuit, 9as9e
9b is an input terminal, 9b is a gate signal output terminal, 9c is a signal output terminal, 9d is an output terminal, and 10 is a microprocessor. Patent applicant: Fujitsu General Ltd. Figure 1 Figure 2
Claims (3)
Ｒやテレビジョン受像機に映像信号を入力する他の機器
を子機とし、親機と子機との両入力映像信号を一つの画
面上に表示する子画面表示回路を有するＶＴＲやテレビ
ジョン受像機において、子画面表示回路に入力させる同
両入力映像信号が正常信号か異常信号であるかを判別す
る手段と、同判別する手段による異常信号の判別結果に
基づき異常検出信号を発生させる手段と、同異常検出信
号を親機内部のマイクロプロセッサと相互にデータを送
受信しているインターフェイス回路に供給し、マイクロ
プロセッサのモードを正常信号モードから異常信号モー
ドに変換する手段と、同変換する手段によるインターフ
ェイス回路の出力信号に対応して置換映像信号を供給す
る手段とからなり、異常入力映像信号から置換映像信号
に置換した後、前記子画面表示回路により一つの画面上
に表示することを特徴とする子画面表示における異常信
号置換装置。(1) Using a VTR or television receiver as a base unit,
VTRs and television receivers that have a sub-screen display circuit that displays both the input video signals from the main unit and the sub-unit on one screen, using other equipment that inputs video signals to the TV receiver as a sub-unit. means for determining whether the same input video signals to be input to the small screen display circuit are normal signals or abnormal signals; and means for generating an abnormality detection signal based on a result of determining the abnormal signal by the determining means. , a means for supplying the abnormality detection signal to an interface circuit that exchanges data with the microprocessor inside the base unit, and converting the mode of the microprocessor from a normal signal mode to an abnormal signal mode; and a means for converting the same. It is characterized by comprising means for supplying a replacement video signal in response to the output signal of the interface circuit, and after replacing the abnormally input video signal with the replacement video signal, the sub-screen display circuit displays it on one screen. Abnormal signal replacement device for sub-screen display.
入力映像信号になる様に自動的に電子式切換スイッチに
て切換る手段と、切換られた親機または子機の入力映像
信号から同期信号を分離する手段と、同同期信号の周波
数変化に対応したＤＣ電圧を発生させるＦ−Ｖ変換器の
出力信号と同期信号の周波数が正常範囲内であるＦ−Ｖ
変換器の出力に相当するＤＣ電圧とを比較するコンパレ
ータ回路と、同同期信号の周波数が正常範囲外になる場
合にはコンパレータ回路の出力に異常検出信号を発生さ
せる手段とからなる請求項（１）記載の子画面表示にお
ける異常信号置換装置。(2) The means for determining automatically switches using an electronic changeover switch so that only the video signal range of the slave unit becomes the input video signal of the slave unit, and the input video of the switched base unit or slave unit. A means for separating the synchronization signal from the signal, and an F-V in which the output signal of the F-V converter that generates a DC voltage corresponding to the frequency change of the synchronization signal and the frequency of the synchronization signal are within the normal range.
Claim (1) comprising: a comparator circuit for comparing the output of the converter with a DC voltage; and means for generating an abnormality detection signal at the output of the comparator circuit when the frequency of the synchronizing signal is outside the normal range. ) Abnormal signal replacement device for sub-screen display.
立に同期信号を分離する手段と、同同期信号の周波数変
化に対応したＤＣ電圧を発生させるＦ−Ｖ変換器の出力
信号と同期信号の周波数が正常範囲内であるＦ−Ｖ変換
器の出力に相当するＤＣ電圧とを比較するコンパレータ
回路と、同同期信号の周波数が正常範囲外になる場合に
はコンパレータ回路の出力に異常検出信号を発生させる
手段とからなる請求項（１）記載の子画面表示における
異常信号置換装置。(3) The means for determining includes a means for independently separating a synchronization signal from the input video signals of the master unit and slave unit, and an output signal of an F-V converter that generates a DC voltage corresponding to the frequency change of the synchronization signal. A comparator circuit that compares the frequency of the synchronizing signal with the DC voltage corresponding to the output of the F-V converter when the frequency of the synchronizing signal is within the normal range, and a An abnormality signal replacement device in a sub-screen display according to claim 1, comprising means for generating an abnormality detection signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8383789A JPH02261286A (en) | 1989-03-31 | 1989-03-31 | Fault signal replacement device in slave screen display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8383789A JPH02261286A (en) | 1989-03-31 | 1989-03-31 | Fault signal replacement device in slave screen display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02261286A true JPH02261286A (en) | 1990-10-24 |
Family
ID=13813818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8383789A Pending JPH02261286A (en) | 1989-03-31 | 1989-03-31 | Fault signal replacement device in slave screen display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02261286A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013246368A (en) * | 2012-05-28 | 2013-12-09 | Sharp Corp | Video signal processing device, video display device and electronic apparatus |
-
1989
- 1989-03-31 JP JP8383789A patent/JPH02261286A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013246368A (en) * | 2012-05-28 | 2013-12-09 | Sharp Corp | Video signal processing device, video display device and electronic apparatus |
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