JPS58134583A - Television receiver - Google Patents
Television receiverInfo
- Publication number
- JPS58134583A JPS58134583A JP1681282A JP1681282A JPS58134583A JP S58134583 A JPS58134583 A JP S58134583A JP 1681282 A JP1681282 A JP 1681282A JP 1681282 A JP1681282 A JP 1681282A JP S58134583 A JPS58134583 A JP S58134583A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- video
- switching
- video signal
- 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
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、外部映像信号入力端子付きのテレビジョン受
像機に関するもので、通常のテレビジョン放送信号の一
部に前記外部映像信号を挿入することのできるテレビジ
ョン受像機を提供することを目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television receiver equipped with an external video signal input terminal, and a television receiver capable of inserting the external video signal into a part of a normal television broadcast signal. The purpose is to provide
例えば、ビデオテープレコーダでテレビジョン信号を録
画しようとする場合、テープの記録可能な部分（例えば
、一本のテープの中での未録画部分とか、不要部分）を
さ９がさねばならない。このとき従来では、テレビジョ
ン受像機をビデオモードに切換えてビデオテープレコー
ダからの再生画面をテレビジョン受像機に映出し、これ
を見て判断しているが、その時は、テレビジョン放送信
号はテレビジョン受像機で視聴することはできないとい
う欠点がある。For example, when recording a television signal with a video tape recorder, the recordable portion of the tape (for example, the unrecorded portion or unnecessary portion of a single tape) must be removed. At this time, in the past, the television receiver was switched to video mode and the playback screen from the video tape recorder was projected on the television receiver, and the judgment was made by looking at this, but at that time, the television broadcast signal was The drawback is that it cannot be viewed on a John receiver.
本発明はかかる欠点を除去しようとするもので、テレビ
ジョン放送信号の一部に外部映像信号を挿入することに
よってビデオテープレコーダモニタを、外部テレビジョ
ン放送の視聴と同時に行えるようにしたものである。第
１図に本発明の一実施例を示す。The present invention aims to eliminate such drawbacks, and by inserting an external video signal into a part of the television broadcast signal, it is possible to monitor the video tape recorder at the same time as viewing the external television broadcast. . FIG. 1 shows an embodiment of the present invention.
図中、テレビジョン放送信号はアンテナを通ってチュー
ナ１へ入り、中間波信号に変換される。In the figure, a television broadcast signal passes through an antenna, enters a tuner 1, and is converted into an intermediate wave signal.
仁の中間波信号は検波増幅回路２を通υ映像信号となる
。そしてこの映像信号は同期分離回路３に入り垂直なら
びに水平同期信号を作シ出す。The digital intermediate wave signal passes through the detection amplifier circuit 2 and becomes a υ video signal. This video signal then enters the synchronization separation circuit 3 and produces vertical and horizontal synchronization signals.
一方、外部映像信号源６、たとえばビデオテープレコー
ダからの映像信号は、ビデオ入力回路子に入力される。On the other hand, a video signal from an external video signal source 6, such as a video tape recorder, is input to the video input circuit.
テレビジ・ン受像機の検波信号とレデオ入力回路７から
の映像信号はともにスイッチング回路６に入る。また同
期分離回路３からの水平同期信号を、テレビ、ビデオ信
号切換信号発生回路４に入れ、スイッチング回路５をコ
ントロールする信号を発生させる。このコントロール信
号で制御された信号は映像増幅回路苧に入る。Both the detection signal of the television receiver and the video signal from the radio input circuit 7 enter the switching circuit 6. Further, the horizontal synchronization signal from the synchronization separation circuit 3 is input to a television/video signal switching signal generation circuit 4 to generate a signal for controlling the switching circuit 5. The signal controlled by this control signal enters the video amplification circuit.
以上の説明を第２図の波形側を用いて説明する。The above explanation will be explained using the waveform side of FIG.
ａはテレビジョン放送信号の検波信号であり、第１図の
検波回路２の出力である。ｂはビデオ入力回路７からの
出力信号である。一般に外部テレビジョン放送信号と外
部映像信号の水平同期位置は一致していない。Ｃはテレ
ビジョン放送信号に同期した水平同期信号（同期分離回
路３の出力）であり、この水平同期信４’ｃをトリガー
としてテレビ、ビデオ切換信号ｄを発生させる。この回
路４は同期信号の立ち下がりを利用する、単安定マルで
きる。このテレビ、ビデオ切換信号ｄにてスイッチング
回路６をコントロールする。この場合、ｄの信号がハイ
レベルであればテレビ側に、ローレベルであればビデオ
側に切換るように構成しておく。このようにしておくと
同図ｅのようにテレビ信号ａ（５）の一部にビデオ信号
ｂ（Ｂ）が挿入され、初期の目的を達成することができ
る。a is a detection signal of a television broadcast signal, which is the output of the detection circuit 2 in FIG. b is an output signal from the video input circuit 7. Generally, the horizontal synchronization positions of an external television broadcast signal and an external video signal do not match. C is a horizontal synchronization signal (output of the synchronization separation circuit 3) synchronized with the television broadcast signal, and this horizontal synchronization signal 4'c is used as a trigger to generate a television/video switching signal d. This circuit 4 is a monostable circuit that utilizes the falling edge of the synchronization signal. A switching circuit 6 is controlled by this television/video switching signal d. In this case, the configuration is such that if the signal d is at a high level, the signal is switched to the television side, and if the signal d is low level, it is switched to the video side. By doing so, the video signal b (B) is inserted into a part of the television signal a (5) as shown in the figure e, and the initial purpose can be achieved.
以上のように本発明によれば、テレビジョン放送信号を
検波したところの映像検波出力と外部映像信号源からの
映像信号をともにスイッチング回路に加える一方、前記
テレビジョン放送信号中の水平同期信号に同期して１水
平走食期間内に一定の期間パルスを発生させ、このパル
スを前記スイッチング回路に加えて異なる前記映像信号
を切換えて出力するようにすることにより、陰極線管に
２つの映像信号金回時に映出することができ、し１゜
たがって、ビデオテープレコーダのテープの記録可能な
部分をテレビジョン受像機で再生して検出する際にも通
常のテレビジョン放送信号を合わせ６１２．、゛
てみることができ、極めて便利である。As described above, according to the present invention, the video detection output obtained by detecting the television broadcast signal and the video signal from the external video signal source are both applied to the switching circuit, and the horizontal synchronization signal in the television broadcast signal is applied to the switching circuit. By synchronously generating pulses for a fixed period within one horizontal scanning period, and adding these pulses to the switching circuit to switch and output the different video signals, two video signal signals are sent to the cathode ray tube. Therefore, when a recordable portion of a video tape recorder's tape is played back and detected by a television receiver, the normal television broadcast signal is combined with the 612. , it is extremely convenient.
第１図は本発明の一実施例におけるテレビジョン受像機
のブロック図、第２図は同テレビジョン受像機の動作説
明のための波形図である。
１ 、、、、、、チューナ、２ 、、、、、、検波回路
、３ 、、、。
１．同期分離回路、４ 、、、、、、切換信号発生回路
、６・・・・・・スイッチング回路１６・・・・・・外
部映像信号源・７・・・・・・入力回路、８・００６０
．映像増幅回路。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第
１ 因
３
第２図FIG. 1 is a block diagram of a television receiver according to an embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining the operation of the television receiver. 1. Tuner, 2. Detection circuit, 3. 1. Synchronous separation circuit, 4, Switching signal generation circuit, 6...Switching circuit 16...External video signal source, 7...Input circuit, 8.0060
．． Video amplification circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Factor 3 Figure 2
Claims (1)
の端子より入った外部映像信号とアンテナ端子より入っ
たテレビジョン放送信号を検波したところの映像信号と
をスイッチング回路に加えるとともに、上記テレビジョ
ン放送信号中の水平同期信号に同期して１水平走査期間
内に一定の期間パルスを発生する手段を設け、この手段
の出力パルスを前記スイッチング回路に加えて外部映像
信号と映像信号とを切換えて出力するようにしたテレビ
ジョン受像機。It is equipped with a terminal to which a video signal from an external video signal source is added, and adds the external video signal input from this terminal and the video signal obtained by detecting the television broadcast signal input from the antenna terminal to the switching circuit. Means for generating a pulse for a fixed period within one horizontal scanning period in synchronization with a horizontal synchronizing signal in a broadcast signal is provided, and the output pulse of this means is applied to the switching circuit to switch between an external video signal and a video signal. A television receiver designed to output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1681282A JPS58134583A (en) | 1982-02-04 | 1982-02-04 | Television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1681282A JPS58134583A (en) | 1982-02-04 | 1982-02-04 | Television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58134583A true JPS58134583A (en) | 1983-08-10 |
Family
ID=11926566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1681282A Pending JPS58134583A (en) | 1982-02-04 | 1982-02-04 | Television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58134583A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4830772A (en) * | 1971-08-24 | 1973-04-23 |
-
1982
- 1982-02-04 JP JP1681282A patent/JPS58134583A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4830772A (en) * | 1971-08-24 | 1973-04-23 |
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