JPH0722940Y2 - Color back sending device - Google Patents

Color back sending device

Info

Publication number
JPH0722940Y2
JPH0722940Y2 JP1988026075U JP2607588U JPH0722940Y2 JP H0722940 Y2 JPH0722940 Y2 JP H0722940Y2 JP 1988026075 U JP1988026075 U JP 1988026075U JP 2607588 U JP2607588 U JP 2607588U JP H0722940 Y2 JPH0722940 Y2 JP H0722940Y2
Authority
JP
Japan
Prior art keywords
signal
video
video signal
output
sent
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.)
Expired - Lifetime
Application number
JP1988026075U
Other languages
Japanese (ja)
Other versions
JPH01129972U (en
Inventor
浩司 原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu General Ltd
Original Assignee
Fujitsu General Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu General Ltd filed Critical Fujitsu General Ltd
Priority to JP1988026075U priority Critical patent/JPH0722940Y2/en
Publication of JPH01129972U publication Critical patent/JPH01129972U/ja
Application granted granted Critical
Publication of JPH0722940Y2 publication Critical patent/JPH0722940Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【考案の詳細な説明】 〔産業上の利用分野〕 本考案は映像記録・再生装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a video recording / reproducing apparatus.

〔従来の技術〕[Conventional technology]

従来の映像記録・再生装置(以下、VTR)においては映
像信号から分離した複合同期信号(再生、TV信号等)と
映像信号の出力を制御するビデオミュート信号の有無を
検出し、映像信号出力の無を判別した信号を出力できる
映像信号検出回路を備えていないため、映像信号の送出
がない場合に例えば赤・緑・青色等のカラーバックや文
字の送出ができず、受像機にはノイズ信号だけが送出さ
れて利用者にとって不快感を与えることがあった。
In a conventional video recording / playback device (VCR), the presence or absence of a composite sync signal (playback, TV signal, etc.) separated from the video signal and the presence of a video mute signal that controls the output of the video signal is detected, and the video signal output Since there is no video signal detection circuit that can output a signal that discriminates nothing, if there is no video signal sent, for example, color backgrounds such as red, green, blue, etc., and characters cannot be sent, and the receiver receives a noise signal. Sometimes, only the information was sent out, which made the user uncomfortable.

〔考案が解決しようとする課題〕[Problems to be solved by the device]

本考案は、このように映像信号の送出がない場合に受像
機にノイズ信号だけが送出され利用者に不快感を与える
問題点を鑑みて、通常の映像信号とビデオミュート信号
の有無を検出して、映像信号の送出がない場合、予め用
意したカラーバックあるいは文字等の映像信号を自動的
に送出できる装置を提供することを目的としている。
The present invention detects the presence or absence of the normal video signal and the video mute signal in view of the problem that only the noise signal is sent to the receiver when the video signal is not sent, which causes the user discomfort. It is an object of the present invention to provide a device that can automatically send a video signal such as a color back or characters prepared in advance when no video signal is sent.

〔問題点を解決するための手段〕[Means for solving problems]

同期分離回路により映像信号から分離した複合同期信号
を取り込む複合同期信号入力端子と、複合同期信号を直
流電圧に変換する積分器と、積分器により変換送出され
た直流電圧を基準電圧と比較し送出するコンパレータ
と、コンパレータよりの判別信号とビデオミュート信号
端子よりの映像信号出力制御信号との論理和をとって映
像出力信号の有無を検出するORゲート回路と、ORゲート
回路から送出される出力信号を受けて作動する制御回路
部と、制御回路部からの指令により予め用意された映像
信号を送出するオンスクリーン回路部と、オンスクリー
ン回路部からの映像信号を出力する映像出力端子とで構
成した。
A composite sync signal input terminal that takes in the composite sync signal separated from the video signal by the sync separation circuit, an integrator that converts the composite sync signal into a DC voltage, and the DC voltage converted and sent by the integrator is compared with the reference voltage and sent. Comparator, the OR gate circuit that detects the presence or absence of the video output signal by ORing the discrimination signal from the comparator and the video signal output control signal from the video mute signal terminal, and the output signal sent from the OR gate circuit. It is composed of a control circuit section that operates in response to the above, an on-screen circuit section that sends out a video signal prepared in advance according to a command from the control circuit section, and a video output terminal that outputs the video signal from the on-screen circuit section. .

〔作用〕[Action]

上記の構成によれば、複合同期信号を積分器で直流電圧
に変換し、複合同期信号の有無に対応した直流電圧をコ
ンパレータで比較検出して映像信号の有無の判別信号と
して取り出し、ORゲート回路によりこの判別信号とビデ
オミュート信号の論理和をとることによってVTRの映像
信号出力の有無に対応した信号を検出し、この検出した
信号を受けて作動する制御回路部からオンスクリーン回
路部に指令を出し、映像出力信号がない場合、予めオン
スクリーン回路部に用意(記憶)された赤・緑・青色等
のカラーバックや文字等の映像信号を自動的に受像機に
送出してカラーバックや文字等を写し出すことができ
る。
According to the above configuration, the composite synchronizing signal is converted into a DC voltage by the integrator, the DC voltage corresponding to the presence or absence of the composite synchronizing signal is compared and detected by the comparator, and it is taken out as a discrimination signal of the presence or absence of the video signal, and the OR gate circuit is provided. The signal corresponding to the presence or absence of the VTR video signal output is detected by taking the logical sum of this discrimination signal and the video mute signal, and the control circuit that operates in response to this detected signal issues a command to the on-screen circuit. When there is no video output signal, the video signals such as red, green and blue color backgrounds and characters, which are prepared (stored) in the on-screen circuit in advance, are automatically sent to the receiver and the color backgrounds and characters are displayed. Etc. can be projected.

〔実施例〕〔Example〕

以下、図面を基にして本考案の実施例について説明す
る。
An embodiment of the present invention will be described below with reference to the drawings.

第1図は本考案による映像信号検出回路図であって、映
像信号から分離した複合同期信号の入力端子(1)と、
抵抗器(R1)の一端を前記複合同期信号入力端子(1)
に結合し、他端には一端をアース回路に結合したコンデ
ンサ(C)を結合してなる積分器(2)と、前記積分器
の出力端を比較器(IC)の+端子に結合し、+電源とア
ース回路間に抵抗器(R2)及び(R3)を直列に結合して
分圧し、前記抵抗器(R2)と同(R3)の結合部に基準電
圧出力端を設けて前記比較器(IC)の−端子に結合して
なるコンパレータ(3)と、ORゲート(4)と、ビデオ
ミュート信号入力端子(5)及び映像信号検出出力端子
(6)とから成っている。以下に、本回路の動作につい
て説明する。
FIG. 1 is a circuit diagram of a video signal detecting circuit according to the present invention, which includes an input terminal (1) for a composite sync signal separated from the video signal,
Connect one end of the resistor (R1) to the composite sync signal input terminal (1)
To the positive terminal of the comparator (IC), and the other end of the integrator (2) is connected to the capacitor (C), the other end of which is connected to the ground circuit, and the output end of the integrator is connected to the + terminal of the comparator (IC). + Resistors (R2) and (R3) are connected in series between the power supply and the earth circuit to divide the voltage, and a reference voltage output terminal is provided at the joint of the resistors (R2) and (R3) to provide the comparator. It comprises a comparator (3) connected to the-terminal of the (IC), an OR gate (4), a video mute signal input terminal (5) and a video signal detection output terminal (6). The operation of this circuit will be described below.

複合同期信号入力端子(1)から積分器(2)に取り込
まれる映像信号より分離された複合同期信号は、映像信
号がある場合は同期信号となり、映像信号がないときは
ノイズとなるが、積分器(2)では上述の複合同期信号
またはノイズ信号を直流電圧に変換してコンパレータ
(3)の比較器(IC)の+端子へ送出し、同比較器の−
端子に入力される基準電圧と比較し映像信号が有る場合
に0、無い場合に1となる判別信号に置き換えORゲート
(4)に送出する。ここで、基準電圧は、複合同期信号
とノイズ信号の各直流電圧間の電圧値とし、各直流電圧
の変動幅に作用されない電圧値になるように、+電源の
電圧を抵抗器(R2)および(R3)により分圧する。ORゲ
ート(4)では上述の判別信号とビデオミュート信号入
力端子(5)からのビデオミュート信号、すなわち、映
像信号をミュートする場合に1、ミュートしない場合に
0となる映像信号出力制御信号の論理和をとることによ
りVTRの映像信号出力の有無を判別した検出信号を映像
信号検出出力端子(6)より送出する。
The composite sync signal separated from the video signal taken into the integrator (2) from the composite sync signal input terminal (1) becomes a sync signal when there is a video signal and becomes noise when there is no video signal, but the integration In the device (2), the above-mentioned composite synchronizing signal or noise signal is converted into a DC voltage and sent to the + terminal of the comparator (IC) of the comparator (3), and the − of the comparator.
It is compared with the reference voltage input to the terminal and is replaced with a discrimination signal which is 0 when there is a video signal and 1 when there is no video signal, and sent to the OR gate (4). Here, the reference voltage is a voltage value between the DC voltages of the composite sync signal and the noise signal, and the voltage of the + power supply is set to a value not affected by the fluctuation width of each DC voltage by the resistor (R2) and Divide by (R3). In the OR gate (4), the above-mentioned discrimination signal and the video mute signal from the video mute signal input terminal (5), that is, the logic of the video signal output control signal which becomes 1 when the video signal is muted and 0 when it is not muted A detection signal for determining the presence or absence of the VTR video signal output by taking the sum is sent from the video signal detection output terminal (6).

つづいて、第2図について説明する。Next, FIG. 2 will be described.

第2図は本考案によるカラーバック送出装置を説明する
ための回路ブロック図で、前記第1図で詳細に説明した
ように映像信号から分離した複合同期信号の入力端子
(1)と、積分器(2)と、コンパレータ(3)と、OR
ゲート(4)と、ビデオミュート信号入力端子(5)及
び映像信号検出出力端子(6)とで成る映像信号検出回
路と、この映像信号検出回路から送出される映像出力信
号の有無に関する出力信号を受けて作動する制御回路部
(7)と、この制御回路部(7)からの指令により予め
用意された映像信号を送出するオンスクリーン回路部
(8)及びカラーバック出力端子(9)とで構成してい
る。
FIG. 2 is a circuit block diagram for explaining a color back transmitting apparatus according to the present invention. As described in detail with reference to FIG. 1, an input terminal (1) for a composite sync signal separated from a video signal and an integrator. (2), comparator (3), and OR
A video signal detection circuit comprising a gate (4), a video mute signal input terminal (5) and a video signal detection output terminal (6), and an output signal relating to the presence / absence of a video output signal sent from the video signal detection circuit. A control circuit section (7) which receives and operates, an on-screen circuit section (8) which sends out a video signal prepared in advance according to a command from the control circuit section (7), and a color back output terminal (9). is doing.

かかる構成であれば、映像信号がある場合、複合同期信
号入力端子(1)に同期信号が入力され、積分器(2)
により直流電圧に変換し、コンパレータ(3)で基準電
圧と比較して0となる判別信号を出力する。映像信号が
ない場合はコンパレータ(3)から1となる判別信号を
出力する。
With such a configuration, when there is a video signal, the sync signal is input to the composite sync signal input terminal (1), and the integrator (2)
Is converted into a DC voltage by means of a comparator (3) and compared with a reference voltage to output a discrimination signal which becomes 0. When there is no video signal, the comparator (3) outputs a determination signal of 1.

従って、ORゲート(4)の出力は映像信号(同期信号)
が無いか、ビデオミュート信号が有る場合に映像信号検
出出力端子(6)から1なる判別信号を制御回路部
(7)に出力し、これを受けた制御回路部(7)からオ
ンスクリーン回路部(8)にカラーバックあるいは文字
等を出力するよう指令を出し、オンスクリーン回路部
(8)よりカラーバック出力端子(9)を介してカラー
バックあるいは文字等を送出する。
Therefore, the output of the OR gate (4) is the video signal (sync signal).
If there is no video signal or if there is a video mute signal, a discrimination signal consisting of 1 is output from the video signal detection output terminal (6) to the control circuit section (7), and the control circuit section (7) receiving this signal outputs the on-screen circuit section. A command is issued to (8) to output a color background or characters, and the on-screen circuit section (8) outputs the color background or characters via the color background output terminal (9).

また、映像信号(同期信号)が有り、かつ、ビデオミュ
ート信号が無い場合のORゲート(4)の出力は、0なる
判別信号となり、制御回路部(7)はオンスクリーン回
路部(8)に指令を出さず、カラーバック出力端子
(9)からカラーバックあるいは文字等を出力しない。
Also, when there is a video signal (synchronization signal) and no video mute signal, the output of the OR gate (4) becomes a determination signal of 0, and the control circuit unit (7) is switched to the on-screen circuit unit (8). No command is issued and no color back or characters are output from the color back output terminal (9).

このように、前記制御回路部(7)は映像信号検出出力
端子(6)から送出される映像信号出力“なし”の信号
(ORゲート(4)の出力が0なる判別信号)を受けると
オンスクリーン回路部(8)を制御するので、カラーバ
ック出力端子(9)から、予め記録保持している赤、
緑、青色等のカラーバックあるいは文字等を受像機に送
出し写し出せるのである。
In this way, the control circuit section (7) is turned on when it receives the video signal output "none" signal (discrimination signal that the output of the OR gate (4) becomes 0) sent from the video signal detection output terminal (6). Since the screen circuit section (8) is controlled, the color back output terminal (9) is used to store the red color which is previously recorded and held.
A color background such as green and blue, or characters can be sent to the receiver and projected.

なお、オンスクリーン回路部(8)は例えば公知の特開
昭60-211496に開示された技術を利用できる。
For the on-screen circuit section (8), for example, the technique disclosed in the publicly known Japanese Patent Laid-Open No. 60-211496 can be used.

〔効果〕〔effect〕

以上説明したような映像信号検出回路とカラーバック送
出装置を備えたVTRであれば、受像機に送出する通常の
映像信号がない場合に、予め用意された赤,緑,青色等
のカラーバックあるいは文字等を自動的に送出して写し
出すことができ便利である。
In the case of the VTR equipped with the video signal detection circuit and the color back transmitting device as described above, when there is no normal video signal to be transmitted to the receiver, the color background such as red, green and blue prepared in advance or It is convenient because characters etc. can be automatically transmitted and displayed.

【図面の簡単な説明】 第1図は本考案の実施例に基づく映像信号検出回路図、
第2図は同じく本考案の実施例に基づくカラーバック送
出装置の回路ブロック図である。 図中、(1)……複合同期信号入力端子、(2)……積
分器、(3)……コンパレータ、(4)……ORゲート、
(5)……ビデオミュート信号入力端子、(6)……映
像信号検出出力端子、(7)……制御回路部、(8)…
…オンスクリーン回路部、(9)……カラーバック出力
端子、(R1,R2,R3)……抵抗器、(C)……コンデン
サ、(IC)……比較器である。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a video signal detection circuit according to an embodiment of the present invention,
FIG. 2 is a circuit block diagram of a color back sending device according to the embodiment of the present invention. In the figure, (1) ... Composite synchronization signal input terminal, (2) ... Integrator, (3) ... Comparator, (4) ... OR gate,
(5) ... video mute signal input terminal, (6) ... video signal detection output terminal, (7) ... control circuit section, (8) ...
… On-screen circuit, (9) …… color back output terminals, (R1, R2, R3) …… resistors, (C) …… capacitors, (IC) …… comparators.

フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 H04N 9/87 Z Continuation of front page (51) Int.Cl. 6 Identification code Office reference number FI Technical indication H04N 9/87 Z

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】同期分離回路により映像信号から分離した
複合同期信号を取り込む複合同期信号入力端子と、複合
同期信号を直流電圧に変換する積分器と、積分器により
変換送出された直流電圧を基準電圧と比較し送出するコ
ンパレータと、コンパレータよりの判別信号とビデオミ
ュート信号端子よりの映像信号出力制御信号との論理和
をとって映像出力信号の有無を検出するORゲート回路
と、ORゲート回路から送出される出力信号を受けて作動
する制御回路部と、制御回路部からの指令により予め用
意された映像信号を送出するオンスクリーン回路部と、
オンスクリーン回路部からの映像信号を出力する映像出
力端子とで成ることを特徴とするカラーバック送出装
置。
1. A composite sync signal input terminal for taking in a composite sync signal separated from a video signal by a sync separation circuit, an integrator for converting the composite sync signal into a DC voltage, and a DC voltage converted and sent by the integrator as a reference. From the OR gate circuit that compares the voltage and sends it, the OR gate circuit that detects the presence or absence of the video output signal by ORing the discrimination signal from the comparator and the video signal output control signal from the video mute signal terminal A control circuit unit that operates in response to an output signal that is sent, an on-screen circuit unit that sends a video signal prepared in advance by a command from the control circuit unit,
And a video output terminal for outputting a video signal from the on-screen circuit section.
JP1988026075U 1988-02-29 1988-02-29 Color back sending device Expired - Lifetime JPH0722940Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1988026075U JPH0722940Y2 (en) 1988-02-29 1988-02-29 Color back sending device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988026075U JPH0722940Y2 (en) 1988-02-29 1988-02-29 Color back sending device

Publications (2)

Publication Number Publication Date
JPH01129972U JPH01129972U (en) 1989-09-05
JPH0722940Y2 true JPH0722940Y2 (en) 1995-05-24

Family

ID=31247370

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988026075U Expired - Lifetime JPH0722940Y2 (en) 1988-02-29 1988-02-29 Color back sending device

Country Status (1)

Country Link
JP (1) JPH0722940Y2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007037144A (en) * 2005-07-27 2007-02-08 Mitac Technology Corp Sound source processing circuit structure and processing method therefor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5941671Y2 (en) * 1979-12-24 1984-12-01 シャープ株式会社 Video signal automatic switching circuit
JPS617182U (en) * 1984-06-20 1986-01-17 株式会社東芝 Recording disc playback device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007037144A (en) * 2005-07-27 2007-02-08 Mitac Technology Corp Sound source processing circuit structure and processing method therefor
JP4490952B2 (en) * 2005-07-27 2010-06-30 神基科技股▲ふん▼有限公司 Sound source processing circuit structure and processing method thereof

Also Published As

Publication number Publication date
JPH01129972U (en) 1989-09-05

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