JPS587986A - Vtr switching circuit - Google Patents
Vtr switching circuitInfo
- Publication number
- JPS587986A JPS587986A JP10568781A JP10568781A JPS587986A JP S587986 A JPS587986 A JP S587986A JP 10568781 A JP10568781 A JP 10568781A JP 10568781 A JP10568781 A JP 10568781A JP S587986 A JPS587986 A JP S587986A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- switching
- signal
- vtr
- switching circuit
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Studio Circuits (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、一般のテレビ受像機をVTR(ビデオ・テー
プ・レコーダ)のモニタ用受像機として利用する場合の
VTR切換回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a VTR switching circuit when a general television receiver is used as a monitor receiver for a VTR (video tape recorder).
この種のVTR切換回路を備えたテレビ受像機としては
、次のようなものがある。これは、v’ra切換回路を
制御するための外部操作スイッチを設け、そのスイッチ
をテレビ側に切換えることによりテレビ放送が受信され
、またVT It、側VC切換えて、そのテレビ受像機
に接続したVTlt i再生状態にすることにエリその
V′r几の再生画像が得られるようにしたものである。The following television receivers include this type of VTR switching circuit. This is equipped with an external operation switch to control the V'RA switching circuit, and by switching the switch to the TV side, TV broadcasts are received, and by switching to the VT It, side VC, it is connected to the TV receiver. It is designed so that a reproduced image of the V'r level can be obtained as soon as the VTlt i reproduction state is set.
しかしながら、上記のVTIL切換回路は、その切換時
に切換操作ケ行なう必要があり、特にその外部操作スイ
ッチは通常有接点式となるので信頼性の点においても問
題があった。However, the above-mentioned VTIL switching circuit requires a switching operation at the time of switching, and in particular, since the external operation switch is usually a contact type, there is also a problem in terms of reliability.
本発明の目的は、v’ritの同期信号を検出してその
同期信号を利用1〜、テレビ放送受信とV’rlLのモ
ニタ動作の間の切換えが自動的に行なわれるようにして
、上記したような問題点を解消したVTrt切換回路を
提供することである。An object of the present invention is to detect the synchronization signal of v'rit and use the synchronization signal 1 to automatically switch between television broadcast reception and V'rlL monitoring operation, thereby achieving the above-mentioned It is an object of the present invention to provide a VTrt switching circuit that solves such problems.
以上、本発明を実施例によって詳細VCC開明る。The detailed VCC development of the present invention has been described above with reference to embodiments.
図において、1はアンテナ、2&:tチー−す、6は映
像中間周波増幅回路、4は音声中間周波増幅回路、5は
映像検波・増幅回路、6は音声検波・増幅回路である。In the figure, 1 is an antenna, 2 &:t cheese, 6 is a video intermediate frequency amplification circuit, 4 is an audio intermediate frequency amplification circuit, 5 is a video detection/amplification circuit, and 6 is an audio detection/amplification circuit.
そして、映像検波・増幅回路5の出力は第1切換回路7
の一方の入力端子に、また行声検波・増幅回路6の出力
は第2切換回路8の一方の入力端子に、各々入力してい
る。一方、外部接続されるVTfl・9の映像入力端子
9aは上記第1切換回路7の他方の入力端子に、また音
声入力端子9bは上記第2切換回路8の他方の入力端子
に、各々入力している。10は第3切換回路であり、十
B電圧を受けてその出力を、チー−す2、映像中間周波
増幅回路6、音声中間周波増幅回路4、映像検波・増幅
回路5お工び音声検波・増幅回路6には十B電圧として
、また第1切換回路7と第2切換回路8には切換制御信
号として送り出すようになっている。11はVTI’t
9からの映像出力から水平同期信号を分離抽出する同
期分離回路であり、そこからの水平同期信号は比較回路
12の一方の入力端子に人力している。この比較回路1
2は、テレビ受像機内部のフライバックトランスから生
じる水平発振のAFO用のフライバックパルスを比較基
準信号として入力しており、同期分離回路11からの信
号がフライバックパルスの周波数と同一の時に、
゛その信号が水平同期信号であることを確認し、出力
信号を能動にして第3切換回路10を制御する工 3−
うになっている。なお、この比較回路12は、水平間l
す1イを吋の周波数を直流rIi、圧に変換するF/V
変換イ(、フライバックパルスの周波数を直流19′圧
に変換するl−”/V変換器、および両1i’/V変換
器の出力電1Fを人力17、両電圧が一致した時に所謂
の直流電圧全発生する比較器により構成することができ
る。The output of the video detection/amplification circuit 5 is then transferred to the first switching circuit 7.
The output of the line detection/amplification circuit 6 is input to one input terminal of the second switching circuit 8. On the other hand, the video input terminal 9a of the externally connected VTfl.9 is input to the other input terminal of the first switching circuit 7, and the audio input terminal 9b is input to the other input terminal of the second switching circuit 8. ing. Reference numeral 10 designates a third switching circuit which receives the 10B voltage and transmits its output to the cheese 2, the video intermediate frequency amplification circuit 6, the audio intermediate frequency amplification circuit 4, the video detection/amplification circuit 5, and the audio detection/amplification circuit 5. The voltage is sent to the amplifier circuit 6 as a voltage of 10 B, and to the first switching circuit 7 and second switching circuit 8 as a switching control signal. 11 is VTI't
This is a synchronization separation circuit that separates and extracts a horizontal synchronization signal from the video output from the comparison circuit 12, and the horizontal synchronization signal from there is inputted to one input terminal of the comparison circuit 12. This comparison circuit 1
2 inputs a horizontal oscillation flyback pulse for AFO generated from a flyback transformer inside the television receiver as a comparison reference signal, and when the signal from the synchronization separation circuit 11 has the same frequency as the flyback pulse,
``It is designed to confirm that the signal is a horizontal synchronization signal, activate the output signal, and control the third switching circuit 10.'' Note that this comparison circuit 12
F/V converts the frequency of 1 to 2 to DC rIi and pressure
Conversion A (1-"/V converter that converts the frequency of the flyback pulse to DC 19' voltage, and the output voltage 1F of both 1i'/V converters is manually powered 17, and when both voltages match, the so-called DC It can be constructed by a comparator that generates all voltages.
昔た、第1切換回路7、第2切(笑回48、および・f
r 3切換回路10に;J−、トランジスタやF1シ′
Vを用いた無接点式しこて構成することができる。In the past, the first switching circuit 7, the second switching circuit (laughing time 48, and f
r 3 switching circuit 10; J-, transistor or F1 switch
It is possible to configure a non-contact type trowel using V.
欠V′C動作全説明する。い−ま、VTIL 9が動作
していない時には、同期分離回路11ンこは人力信号が
ないので出力値ν)もなく、このため比較回路12の出
力イバシ号は非能動となる。よって、その出力(1’を
制御イg番号として受ける第3切換回路10は、入力端
に加わった+Bffi圧全、チー−す2、映像中間周波
増幅回路6、音声中間周波増幅回路4、映像検波・増幅
回路5、および音声検波・増幅回路6に印加してそhら
の回路を正常に動作させる。またその十B市圧を第1切
換回路7と第2すJ換回路8にも制御16弓として与え
、ぞの11g1切換回路7が映像検 4−
波・増幅回路5の出力信号を選択し、また第2切換回路
8が音声検波・増幅回路6の出力信号を選択するように
する。よって、以上のようにVTI−L 9が動作して
いないときには、受信したテレビ放送の映像信号が第1
切換回路7から出力され、受信したテレビ放送の音声信
号が第2切換回路8から出力される。The entire operation of the missing V'C will be explained. Now, when the VTIL 9 is not operating, the synchronization separation circuit 11 has no human input signal, so there is no output value ν), and therefore the output signal of the comparison circuit 12 is inactive. Therefore, the third switching circuit 10 which receives the output (1' as the control signal number) outputs the +Bffi pressure applied to the input terminal, the cheese 2, the video intermediate frequency amplification circuit 6, the audio intermediate frequency amplification circuit 4, and the video It is applied to the detection/amplification circuit 5 and the audio detection/amplification circuit 6 to make those circuits operate normally.The 10B city pressure is also applied to the first switching circuit 7 and the second J switching circuit 8. The control circuit 16 selects the output signal of the video detection/amplification circuit 5, and the second switching circuit 8 selects the output signal of the audio detection/amplification circuit 6. Therefore, when the VTI-L 9 is not operating as described above, the received television broadcast video signal is
The audio signal of the received television broadcast is output from the switching circuit 7 and is output from the second switching circuit 8.
一方、このようなテレビ放送受信中に、■T几9を操作
じて再生状態にすると、映像入力端子9aに映像信号が
加わり、同期分離回路11において水平同期信号が分離
抽出され、その水平同期信号が比較回路12の一方の入
力信号となる。この時この比較回路12の他方の入力に
はフライバックパルスが加わっており、この場合いずれ
の入力信号も15.75KHzの周波数であるので、そ
の比較回路12の出力信号が能動となり、第3切換回路
10が+B電圧を出力しなくなる。よって、チー−す2
.1映像中間周波増幅回路6、i声中間周波増幅回路4
、映像検波・増幅回路5、および音声検波・増幅回路6
のすべてが不動作状態になると共に、第1I/J換回路
7と第2切換回路8が切換って、第1切換回路7はVT
凡9からの映像信号を選択し、第2切換回路8はVTR
9からの音声信号を選択する工うKなる。On the other hand, when receiving such a TV broadcast, when the T-box 9 is operated to enter the playback state, a video signal is applied to the video input terminal 9a, a horizontal synchronizing signal is separated and extracted in the synchronization separation circuit 11, and the horizontal synchronization signal is separated and extracted. The signal becomes one input signal of the comparison circuit 12. At this time, a flyback pulse is applied to the other input of this comparator circuit 12, and in this case, both input signals have a frequency of 15.75 KHz, so the output signal of the comparator circuit 12 becomes active, and the third switching The circuit 10 no longer outputs the +B voltage. Therefore, Team 2
.. 1 video intermediate frequency amplification circuit 6, i-voice intermediate frequency amplification circuit 4
, video detection/amplification circuit 5, and audio detection/amplification circuit 6
At the same time, the first I/J switching circuit 7 and the second switching circuit 8 switch, and the first switching circuit 7 becomes VT.
The second switching circuit 8 selects the video signal from the VTR.
It becomes K when selecting the audio signal from 9.
よって、以上のようにVTR9が再生動作をするときに
は、テレビ放送の受信が停止され、そのVTIL9の映
像信号が@l切換回路7から出力され、またそのV’r
几9の音声信号が第2切換回路8から出力されるような
自動的な切換が行なわれ、且つテレビ受像機内の不要な
回路への+B!圧供給が停止される。Therefore, when the VTR 9 performs playback operation as described above, reception of television broadcasting is stopped, the video signal of the VTIL 9 is output from the @l switching circuit 7, and the V'r
Automatic switching is performed such that the audio signal of 几9 is output from the second switching circuit 8, and the +B! Pressure supply is stopped.
そして、その後V’r II・9の再生動作が終了又は
途中停止すると、音声信号と共に映像信号がなくなるの
で、前記したように比較回路12の出力信号が非能動と
なり、テレビ放送の受4M状態に自動的に復帰する。Then, when the reproduction operation of V'r II.9 is finished or stopped midway, the video signal disappears along with the audio signal, so the output signal of the comparator circuit 12 becomes inactive as described above, and the TV broadcast reception 4M state is reached. It will return automatically.
以上のように、本発明のVTft切換回路によれば、テ
レビ受像機に出力を接続したVTR9の側の再生の動作
・不動作によってテレビ受像機がv’ra画像再生、テ
レビ放送受信を自動的に選択するようになり、切換操作
を行なう必要がなくなる。このた信頼性も向上する。As described above, according to the VTft switching circuit of the present invention, the TV receiver automatically switches between V'RA image playback and TV broadcast reception depending on the reproduction operation/non-operation of the VTR 9 whose output is connected to the TV receiver. This eliminates the need for switching operations. Reliability is also improved.
図は本発明の一実施例を示すvT比切換回路の回路図で
ある。
特許出願人 株式会社 ゼネラルThe figure is a circuit diagram of a vT ratio switching circuit showing one embodiment of the present invention. Patent applicant General Co., Ltd.
Claims (5)
からの映像信号中の同期信号を検出し、該同期信号の有
無によって、該VTRの再生信号のモニタ動作とテレビ
放送の受信動作を切換えるようにしたことを特徴とする
VTIL切換回路。(1) A VTR connected externally in a television receiver
1. A VTIL switching circuit characterized in that it detects a synchronizing signal in a video signal from a VTR, and switches between monitoring a reproduction signal of the VTR and receiving television broadcasting depending on the presence or absence of the synchronizing signal.
徴とする特許請求の範囲第1項記載のVTR切換回路。(2) The VTR switching circuit according to claim 1, wherein the synchronization signal is a horizontal synchronization signal.
映像信号を切換える第1切換手段と、上記VTRからの
音声信号と上記テレビ放送の音声信号を切換える第2切
換手段と、上記水平同期信号の有無によって上記第1切
換手段および上記第2切換手段を制御する第3切換手段
とを含むことを特徴とする特許請求の範囲第2項記載の
VTR切換回路。(3) a first switching means for switching between the video signal from the VTR and the video signal for the television broadcast; a second switching means for switching between the audio signal from the VTR and the audio signal for the television broadcast; and the horizontal synchronization signal. 3. The VTR switching circuit according to claim 2, further comprising third switching means for controlling said first switching means and said second switching means depending on the presence or absence of said switching means.
映像信号から水平同期信号を分離抽出する同期分離手段
の出つ、信号とフライバックパルスとを比較する比較手
段によって行なわれること全特徴とする特許請求の範囲
第2項記載のVTR,切換回路。(4) The detection of the horizontal synchronization signal is performed by a comparison means for comparing the signal and a flyback pulse, which includes a synchronization separation means for separating and extracting the horizontal synchronization signal from the video signal from the VTR. A VTR and a switching circuit according to claim 2.
と上記フライバックパルスの周波数を比較することを特
徴とする特許請求の範囲第1項記載のVTR切換回路。 (61,上記第3切換手段が、テレビ放送受信用の高周
波回路の電源を同時に切換えるようにしたことを特徴と
する特許請求の範囲第3項記載のVTIL切換回路。(5) The VTR switching circuit according to claim 1, wherein the comparison means compares the output signal of the synchronization separation means and the frequency of the flyback pulse. (61. The VTIL switching circuit according to claim 3, wherein the third switching means simultaneously switches the power supplies of the high frequency circuit for receiving television broadcasting.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10568781A JPS587986A (en) | 1981-07-08 | 1981-07-08 | Vtr switching circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10568781A JPS587986A (en) | 1981-07-08 | 1981-07-08 | Vtr switching circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS587986A true JPS587986A (en) | 1983-01-17 |
Family
ID=14414308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10568781A Pending JPS587986A (en) | 1981-07-08 | 1981-07-08 | Vtr switching circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS587986A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59147576A (en) * | 1983-02-10 | 1984-08-23 | Matsushita Electric Ind Co Ltd | Television receiver |
JPS6089278A (en) * | 1983-10-21 | 1985-05-20 | Pioneer Electronic Corp | Picture information processing system |
JPS61182379A (en) * | 1985-02-08 | 1986-08-15 | Matsushita Electric Ind Co Ltd | Channel converter |
JPS6284663A (en) * | 1985-10-09 | 1987-04-18 | Matsushita Electric Ind Co Ltd | Automatic signal switching device |
JPS62243482A (en) * | 1986-04-09 | 1987-10-23 | テクトロニクス・インコ−ポレイテツド | Synchronous changer |
JPH01159473U (en) * | 1988-04-25 | 1989-11-06 | ||
EP0420701A2 (en) * | 1989-09-29 | 1991-04-03 | Sharp Kabushiki Kaisha | Flat-panel display with masking for VTR signals |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50122121A (en) * | 1974-03-12 | 1975-09-25 |
-
1981
- 1981-07-08 JP JP10568781A patent/JPS587986A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50122121A (en) * | 1974-03-12 | 1975-09-25 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59147576A (en) * | 1983-02-10 | 1984-08-23 | Matsushita Electric Ind Co Ltd | Television receiver |
JPS6089278A (en) * | 1983-10-21 | 1985-05-20 | Pioneer Electronic Corp | Picture information processing system |
JPS61182379A (en) * | 1985-02-08 | 1986-08-15 | Matsushita Electric Ind Co Ltd | Channel converter |
JPS6284663A (en) * | 1985-10-09 | 1987-04-18 | Matsushita Electric Ind Co Ltd | Automatic signal switching device |
JPS62243482A (en) * | 1986-04-09 | 1987-10-23 | テクトロニクス・インコ−ポレイテツド | Synchronous changer |
JPH01159473U (en) * | 1988-04-25 | 1989-11-06 | ||
EP0420701A2 (en) * | 1989-09-29 | 1991-04-03 | Sharp Kabushiki Kaisha | Flat-panel display with masking for VTR signals |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS6256094A (en) | Detecting system for picture recording/reproducing data of video tape recorder | |
JPS587986A (en) | Vtr switching circuit | |
US4789905A (en) | Output signal switching circuit for a video tape recorder | |
JPH0113486Y2 (en) | ||
JPS6284663A (en) | Automatic signal switching device | |
JPS6129585B2 (en) | ||
JPS61247131A (en) | Booster | |
KR930011600B1 (en) | Power supply switching off method when tv receiver has no signal | |
JP4118419B2 (en) | Electronic equipment | |
JPH04188972A (en) | Television receiver with built-in timer function | |
JP2819815B2 (en) | Automatic power off circuit | |
JP3282419B2 (en) | Signal detection device | |
JPS5884576A (en) | Television receiver | |
KR910006358B1 (en) | External signal selecting circuit and method for playback of video tape | |
KR0136501Y1 (en) | Ntsc/pal automatic detecting circuit | |
KR940003459Y1 (en) | Input signal automatic switching circuit of vcr | |
JPS5932034B2 (en) | Television receiver with recording device | |
JPH055733Y2 (en) | ||
KR930007194Y1 (en) | Automatic reciving transfer circuit for stereo sound broadcasting system | |
KR940006719Y1 (en) | Device for checking signal in vcr | |
KR0134530Y1 (en) | Automatic discrimination circuit of multi-sound broadcasting | |
KR880000816Y1 (en) | Television broadcasting signal and vtr reproducing signal modulating circuit | |
JPS585088A (en) | Video reproducer | |
JPH05328238A (en) | Television reception circuit | |
JPH05268544A (en) | Controller for video equipment |