JPS6213172A - Television receiver - Google Patents

Television receiver

Info

Publication number
JPS6213172A
JPS6213172A JP15318585A JP15318585A JPS6213172A JP S6213172 A JPS6213172 A JP S6213172A JP 15318585 A JP15318585 A JP 15318585A JP 15318585 A JP15318585 A JP 15318585A JP S6213172 A JPS6213172 A JP S6213172A
Authority
JP
Japan
Prior art keywords
display
memory
channel
screen
period
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
Application number
JP15318585A
Other languages
Japanese (ja)
Inventor
Hideyuki Yasuda
秀幸 安田
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP15318585A priority Critical patent/JPS6213172A/en
Publication of JPS6213172A publication Critical patent/JPS6213172A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To display plural pictures at the same time on one screen by storing the video information of one horizontal scanning period during the display scanning period of a channel synchronizing signal into a buffer memory, writing the said information in the display memory during the vertical blanking period of a TV synchronizing signal and reading it during the display period. CONSTITUTION:In the multi-mode, a central control section 2 gives an instruction to a channel selection section 3 to select, e.g., a station A. A multiplexer 10 is controlled by a memory control section 9 in a timing shown in figure and the picture information of the station A is written in a buffer memory 12 in the unit of one horizontal scanning line. In this case, the data quantity is thinned to 1/3. The information is read during the vertical blanking period, transferred to the designated area of a display memory 13 and the video image is displayed. The write to memories 12, 13 is stopped tentatively after a prescribed time after the end of the operation. The timing is synchronized with the data transfer time of one field and displayed as a still picture on a small pattern. Then the station B is selected and the data is written in other area of the memory 13. Then the still picture of the station A and the animation picture of the station B are displayed. Said operation is repeated sequentially.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、一画面中に複数のチャンネルの映像情報を同
時に映出する機能を有するテレビジョン受像機に関する
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a television receiver having a function of simultaneously displaying video information of a plurality of channels on one screen.

(従来の技術) 現在、わが国のテレビジョン放送の状態では。(Conventional technology) The current state of television broadcasting in our country.

−地域で受信可能な放送局はせいぜい9チャンネルであ
り、一画面にすべてのチャンネルの画像を同時に映し出
すことができれば、視聴者は一目でその地域における全
放送チャンネルの放送内容を確認することができ2選局
部作が便利になる。ところが、複数の画像を一画面中に
映出しようとすれば、その画像の数だけチューナを増設
しなければならず、一画面中に一地域での全放送チャン
ネルの画像を映出することは実用的に無理であった。
-The number of broadcast stations that can be received in a region is at most 9 channels, and if images from all channels can be displayed simultaneously on one screen, viewers will be able to check the broadcast content of all broadcast channels in that region at a glance. The second selection part will be convenient. However, if you want to display multiple images on one screen, you will need to add tuners for the number of images, and it is not possible to display images from all broadcast channels in one area on one screen. It was practically impossible.

(発明の目的) 本発明は上述の問題点に鑑みてなされたものであって、
一画面中に複数の画像を同時に映出することができるよ
うにし、受像機の構成を複雑化。
(Object of the invention) The present invention has been made in view of the above-mentioned problems, and includes:
This makes it possible to display multiple images simultaneously on a single screen, complicating the configuration of the receiver.

大型化することなく、−地域における全放送チャンネル
の内容確認を容易にし、チャンネル選局操作が便利なテ
レビジョン受像機を提供することを目的とする。
To provide a television receiver that facilitates confirmation of the contents of all broadcast channels in a region and convenient channel selection operations without increasing the size.

(発明の構成) 本発明のテレビジョン受像機は、一定周期でチャンネル
を切り換えて各チャンネルの映像信号を順次読み出し、
一画面中に複数チャンネルの画像を同時に映出するテレ
ビジョン受像機であって。
(Structure of the Invention) The television receiver of the present invention switches channels at regular intervals and sequentially reads video signals of each channel.
A television receiver that displays images from multiple channels simultaneously on one screen.

チューナの受信チャンネルを切り換える選局部と。A tuning section that switches the receive channel of the tuner.

この選局部によって選局されたいずれかのチャンネルの
映像情報を記憶するバッファメモリと、前記選局部によ
って選局された1つもしくは複数チャンネルの各映像信
号を記憶する表示メモリと。
A buffer memory that stores video information of any channel selected by the channel selection section, and a display memory that stores each video signal of one or more channels selected by the channel selection section.

受信電波中の同期信号に基いて前記へソファメモリへの
書き込みの制御およびテレビジョン同期信号に同期して
前記表示メモリへの書き込み読み出しの制御をするメモ
リ制御部と、前記選局部、ハソファメモリ9表示メモリ
およびメモリ制御部を制御する中央制御部とを備え、ブ
ラウン管の表示画面上に複数チャンネルの画像を映し出
すときは。
a memory control unit that controls writing to the sofa memory based on a synchronization signal in received radio waves and controls writing and reading to the display memory in synchronization with a television synchronization signal, the channel selection unit, and a sofa memory; 9 display memory and a central control section that controls the memory control section, when projecting images of multiple channels on the display screen of a cathode ray tube.

該チャンネル同期信号の表示走査期間中に、1水平走査
期間の映像情報を前記バッファメモリに記憶させた後、
テレビジョン同期信号の垂直帰線期間中に、前記バッフ
ァメモリの情報を前記表示メモリに書き込み、テレビジ
ョン同期信号の表示期間中に読み出してブラウン管の表
示画面上にその映像情報を映し出すものである。
After storing video information for one horizontal scanning period in the buffer memory during the display scanning period of the channel synchronization signal,
Information in the buffer memory is written into the display memory during the vertical retrace period of the television synchronization signal, and is read out during the display period of the television synchronization signal to display the video information on the display screen of the cathode ray tube.

(実施例) 以下1本発明の一実施例を図面を参照して説明する。(Example) An embodiment of the present invention will be described below with reference to the drawings.

第1図は1本発明に係るテレビジョン受像機のブロック
図である。
FIG. 1 is a block diagram of a television receiver according to the present invention.

第1図において、操作部1に、一画面中に複数のチャン
ネルの画像を同時に映出する動作(以下マルチモードと
いう。)の開始命令が入力されると、その操作指示をす
る信号が中央制御部2に送られる。中央制御部2は回路
にマルチモート−の動作をさせるために選局部3へ選局
指示信号を送りチューナに選局動作をさせる。チューナ
5はアンテナ4より得られるVHF、UHFテレビジョ
ン信号の中から1例えばA放送局のチャンネル信号を選
局し、Aチャンネルの複合映像信号を映像増幅部6に出
力する。
In FIG. 1, when a command to start an operation that simultaneously displays images of multiple channels on one screen (hereinafter referred to as multimode) is input to the operation unit 1, a signal instructing the operation is sent to the central control unit. Sent to Department 2. In order to cause the circuit to perform multi-mode operation, the central control section 2 sends a tuning instruction signal to the tuning section 3 to cause the tuner to perform the tuning operation. The tuner 5 selects one channel signal, for example, broadcasting station A, from among the VHF and UHF television signals obtained from the antenna 4, and outputs the composite video signal of the A channel to the video amplification section 6.

映像増幅部6で増幅されたAチャンネルの複合映像信号
は映像信号処理部7と同期信号処理部8とにそれぞれ入
力される。映像信号処理部7では複合映像信号が輝度信
号(Y信号)と2つの色差信号(R−Y信号、B−Y信
号)とに分離され。
The A-channel composite video signal amplified by the video amplification section 6 is input to a video signal processing section 7 and a synchronization signal processing section 8, respectively. In the video signal processing section 7, the composite video signal is separated into a luminance signal (Y signal) and two color difference signals (RY signal, BY signal).

マルチプレクサ10に人力される。一方、同期信号処理
部8では前記復号映像信号が水平同期信号Hと垂直同期
信号■とに分離され、これら分離された各同期信号H,
Vはメモリ制御部9と偏向出力部16に入力される。
The multiplexer 10 is manually operated. On the other hand, in the synchronization signal processing section 8, the decoded video signal is separated into a horizontal synchronization signal H and a vertical synchronization signal ■, and each of these separated synchronization signals H,
V is input to the memory control section 9 and the deflection output section 16.

第2図は、上記マルチプレクサ10の周辺を示し、この
マルチプレクサ10の動作はメモリ制御部9からの各選
択制御信号YSL、R3L、BSLにて、第3図に示す
ようなタイミングで制御される。すなわち1選択制御体
号YSL、R3L。
FIG. 2 shows the periphery of the multiplexer 10, and the operation of the multiplexer 10 is controlled by selection control signals YSL, R3L, and BSL from the memory control section 9 at timings as shown in FIG. That is, 1 selection control body number YSL, R3L.

B S Lは、同期信号処理部8からの水平同期信号H
の立上りからスタートするサンプリングクロックADC
Kを基に作られ、Y、R−Y、Y、B−Y・・・の順序
でマルチプレクサ10の各スイッチを選択制御し、各ス
イッチは各選択制御信号Y S L 。
BSL is the horizontal synchronization signal H from the synchronization signal processing section 8
The sampling clock ADC starts from the rising edge of
The switches of the multiplexer 10 are selectively controlled in the order of Y, RY, Y, BY, . . . , and each switch receives a selection control signal YSL.

BSL、BSLが「■1」レヘルとなった時にONとな
る。
BSL, turns ON when BSL becomes "■1" level.

このように時間的に分割された輝度信号(Y)と2つの
色差信号(R−Y、B−Y)はA/D変換部11に入力
され、メモリ制御部9からのサンプリングクロックAD
CKによってデジタル信号に変換され、バッファメモリ
I2に1水平走査線単位で書き込まれる。この水平走査
線の書き込みは、第4図に示すように、水平走査線3本
につき1本の割合で行われる。これは、同一画面中に複
数画面(本例では9つ)を表示するために、垂直方向の
データ量を1/3に間引きしているものである。
The luminance signal (Y) and two color difference signals (RY, B-Y) thus temporally divided are input to the A/D converter 11, and the sampling clock AD from the memory controller 9 is input to the A/D converter 11.
It is converted into a digital signal by CK and written into the buffer memory I2 in units of one horizontal scanning line. This horizontal scanning line writing is performed at a rate of one for every three horizontal scanning lines, as shown in FIG. This thins out the amount of data in the vertical direction to 1/3 in order to display multiple screens (nine in this example) on the same screen.

バッファメモリ12に書き込まれた水平方向1ライン分
のデジタル咬像情報は、メモリ制御部9からの指示で垂
直帰線期間に読み出され9表示メモリ13の指定エリア
に転送される。また表示メモリ13はメモリ制御部9か
らの指示により表示メモリ13内に書き込まれている画
像データを読み出し、読み出された画像データは、D/
A変換部14においてメモリ制御部9からのクロックD
ACKによりアナログ映像信号に変換される。変換され
たアナログ映像信号は映像出力部15に入力され、ブラ
ウン管17に導かれる一方、偏向出力部16に同期信号
処理部8から入力された各同期信号H,Vによりブラウ
ン管17が駆動され。
Digital occlusion information for one horizontal line written in the buffer memory 12 is read out during the vertical retrace period according to an instruction from the memory control section 9 and transferred to a designated area of the 9-display memory 13. Further, the display memory 13 reads image data written in the display memory 13 according to instructions from the memory control unit 9, and the read image data is
In the A conversion unit 14, the clock D from the memory control unit 9
The signal is converted into an analog video signal by ACK. The converted analog video signal is input to the video output section 15 and guided to the cathode ray tube 17, while the cathode ray tube 17 is driven by each synchronization signal H and V input from the synchronization signal processing section 8 to the deflection output section 16.

映像情報が映し出される。つまり第5図(alに示すよ
うに通常のテレビ画面の水平走査線をH1〜H7とする
と、上述のように間引きされバッファメモリ12に書き
込まれた水平ラインの映像情tI3は圧縮(3倍のクロ
ックで読み出される)され、  H’、 。
Video information is displayed. In other words, if the horizontal scanning lines of a normal television screen are H1 to H7 as shown in FIG. (read by clock) and H', .

H’4 、  H′7.  H’+。37として表示メ
モリに転送される。そしてこの操作を順々に行うと5第
5図(blに示すように、水平、垂直方向ともに圧縮さ
れた小画面動画がブラウン管17の表示画面上の1部に
映し出される。そこで、少なくともこの操作が通常テレ
ビ画面の1フイールドを終了した後に、ある一定時間例
えば1〜2秒経過したら、メモリ制御部9によりバッフ
ァメモリ12および表示メモリ13へのデータの書き込
みを一時中止する。この中止のタイミングは必ず1フイ
一ルド分のデータ転送時間と同期して行われ、その時点
で表示メモリ13の指定エリアに1フイ一ルド分の映像
情報が残っている事になり、小画面の静止画として映し
出される。その状態を第6図fatに示す。次に。
H'4, H'7. H'+. 37 and is transferred to the display memory. When these operations are performed one after another, a small-screen video compressed both horizontally and vertically is displayed on a portion of the display screen of the cathode ray tube 17, as shown in Figure 5 (bl). After a certain period of time, for example 1 to 2 seconds, has elapsed after one field of the normal TV screen has passed, the memory control unit 9 temporarily stops writing data to the buffer memory 12 and display memory 13.The timing of this stop is This is always done in synchronization with the data transfer time for one field, and at that point, video information for one field remains in the designated area of the display memory 13, and is displayed as a still image on a small screen. The state is shown in Figure 6 fat.Next.

チューナ5の選局をB局に変え、ブラウン管17の表示
画面上の先程とは異なった位置、つまり表示メモリ13
の他のエリアにA局の時と同様にデ−タを書き込む。す
ると、A局の静止画データはそのままであるので、第6
図(blに示すように、A局の静止画とB局の動画の画
面とが映し出される。
Change the tuner 5's selection to station B, and move it to a different position on the display screen of the cathode ray tube 17, that is, display memory 13.
Write data to other areas in the same way as for station A. Then, since the still image data of station A remains unchanged, the 6th station
As shown in Figure (bl), a still image of station A and a video screen of station B are displayed.

B局の動画も上記A局の時と同様に一定時間経過後静止
画になる。この操作を次々に繰り返すと動画面がA−4
B−+C→D−+E→F→G→11→■と移動し、その
iMl過した場所には、第6図fclに示すように、各
チャンネルの静止画面が残る。この操作が1局まで行き
、1局が静止画になったならば再びA局に戻り、順次各
チャンネルを選局する事になる。
The video of station B also becomes a still image after a certain period of time, similar to the case of station A. If you repeat this operation one after another, the video screen will change to A-4.
It moves in the order of B-+C→D-+E→F→G→11→■, and the still screen of each channel remains at the location where iM1 has passed, as shown in FIG. 6 fcl. When this operation reaches one station and one station becomes a still image, it returns to station A and selects each channel in sequence.

(発明の効果) 本発明のテレビジョン受像機は、同−画面中に複数のチ
ャンネルの画像を同時に映出することができるので5視
聴者はチャンネル選局時に受信できうるずべてのチャン
ネル内容を即座に確認することができチャンネル選局が
容易になる。また。
(Effects of the Invention) The television receiver of the present invention can simultaneously display images of multiple channels on the same screen, so five viewers can watch the contents of all the channels that can be received when selecting a channel. You can check the channel instantly, making it easier to select the channel. Also.

各チャンネルの映像が静止画として映し出され。The video from each channel is displayed as a still image.

その更新時には一定時間動画になるので連続的で滑らか
な画像が得られ視覚効果に優れている。
When updating, it becomes a moving image for a certain period of time, so a continuous and smooth image can be obtained and the visual effect is excellent.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明に係るテレビジョン受像機の一実施例を
示すブロック図、第2図はマルチプレクサ周辺を示すブ
ロック図、第3図はマルチプレクサの制御タイミングチ
ャート、第4図は水平走査線の間引きを示すタイミング
チャート、第5図(a)は通常のテレビ画面1フイール
ドを示す図、第5図fblは圧縮された小画面動画が映
し出された画面を示す図、第6図(al乃至第6図tc
+は小画面篩1に1画が順次映し出された画面を示す図
である。 2・・・中央制御部、    3・・・選局部5・・・
チューナ、     6・・・映像増幅部7・・・映像
信号処理部、  8・・・同期信号処理部9・・・メモ
リ制御部、  10・・・マルチプレクサ12・・・バ
ッツァメモリ、13・・・表示メモリ17・・・ブラウ
ン管
Fig. 1 is a block diagram showing an embodiment of a television receiver according to the present invention, Fig. 2 is a block diagram showing the surroundings of a multiplexer, Fig. 3 is a control timing chart of the multiplexer, and Fig. 4 is a horizontal scanning line diagram. Timing chart showing thinning, FIG. 5(a) is a diagram showing one field of a normal TV screen, FIG. Figure 6 tc
+ is a diagram showing a screen in which one stroke is sequentially projected on the small screen sieve 1. 2... Central control section, 3... Tuning section 5...
Tuner, 6... Video amplification unit 7... Video signal processing unit, 8... Synchronization signal processing unit 9... Memory control unit, 10... Multiplexer 12... Batza memory, 13... Display Memory 17... CRT

Claims (1)

【特許請求の範囲】 1)一定周期でチャンネルを切り換えて各チャンネルの
映像信号を順次読み出し、一画面中に複数チャンネルの
画像を同時に映出するテレビジョン受像機であって、 チューナの受信チャンネルを切り換える選局部と、 この選局部によって選局されたいずれかのチャンネルの
映像情報を記憶するバッファメモリと、 前記選局部によって選局された1つもしくは複数チャン
ネルの各映像信号を記憶する表示メモリと、 受信電波中の同期信号に基いて前記バッファメモリへの
書き込みの制御およびテレビジョン同期信号に同期して
前記表示メモリへの書き込み読み出しの制御をするメモ
リ制御部と、 前記選局部、バッファメモリ、表示メモリおよびメモリ
制御部を制御する中央制御部とを備え、 ブラウン管の表示画面上に複数チャンネルの画像を映し
出すときは、該チャンネル同期信号の表示走査期間中に
、1水平走査期間の映像情報を前記バッファメモリに記
憶させた後、テレビジョン同期信号の垂直帰線期間中に
、前記バッファメモリの情報を前記表示メモリに書き込
み、テレビジョン同期信号の表示期間中に読み出してブ
ラウン管の表示画面上にその映像情報を映し出すことを
特徴とするテレビジョン受像機。 2)ブラウン管の表示画面上に相異なる9チャンネルの
映像情報を映し出すものである特許請求の範囲第1項に
記載のテレビジョン受像機。 3)ある1つのチャンネル映像情報を該チャンネル同期
信号の表示走査期間中、1本の表示水平走査線単位で前
記バッファメモリに書き込み、次の水平走査期間に読み
出し、前記表示メモリに書き込む操作を表示走査期間繰
り返し、テレビジョン同期信号の表示期間中に読み出し
てブラウン管の表示画面上に小画面の動画を表示するも
のである特許請求の範囲第1項または第2項に記載のテ
レビジョン受像機。 4)複数チャンネルの映像情報を次々にブラウン管の表
示画面上に映し出す際、ある1つのチャンネル映像情報
を該チャンネル同期信号の表示走査期間中、1本の表示
水平走査線単位で前記バッファメモリに書き込み、次の
水平走査期間に読み出し、前記表示メモリに書き込む操
作を表示走査期間繰り返し、テレビジョン同期信号の表
示期間中に読み出してブラウン管の表示画面上に小画面
の動画を表示し、ある一定時間経過後、前記バッファメ
モリから読み出される映像信号の前記表示メモリへの書
き込みを表示メモリにちょうど1フレーム分の映像情報
が書き込まれた後に禁止して前記小画面の動画を静止画
像として映し出し、さらにブラウン管の表示画面上の他
の場所に前記選局部によって次に選局されたチャンネル
映像情報を再び上記の操作を繰り返して小画面の動画と
して映し出す操作を順次行うものである特許請求の範囲
第1項に記載のテレビジョン受像機。
[Claims] 1) A television receiver that switches channels at regular intervals and sequentially reads out the video signals of each channel, and displays images of multiple channels simultaneously on one screen, the receiver comprising: A channel selection section for switching, a buffer memory for storing video information of any channel selected by the channel selection section, and a display memory for storing each video signal of one or more channels selected by the channel selection section. , a memory control unit that controls writing to the buffer memory based on a synchronization signal in received radio waves and controls writing and reading to the display memory in synchronization with a television synchronization signal; the channel selection unit; the buffer memory; It is equipped with a display memory and a central control unit that controls the memory control unit, and when projecting images of multiple channels on the display screen of a cathode ray tube, the video information of one horizontal scanning period is transmitted during the display scanning period of the channel synchronization signal. After being stored in the buffer memory, the information in the buffer memory is written into the display memory during the vertical retrace period of the television synchronization signal, read out during the display period of the television synchronization signal, and displayed on the display screen of the cathode ray tube. A television receiver is characterized by displaying the video information. 2) The television receiver according to claim 1, which projects nine different channels of video information on a display screen of a cathode ray tube. 3) Displaying an operation of writing one channel video information to the buffer memory in units of one display horizontal scanning line during the display scanning period of the channel synchronization signal, reading it out during the next horizontal scanning period, and writing it to the display memory. 3. The television receiver according to claim 1, wherein a small-screen moving image is displayed on a display screen of a cathode ray tube by repeating a scanning period and reading out a television synchronization signal during a display period. 4) When displaying video information of a plurality of channels one after another on the display screen of a cathode ray tube, the video information of one channel is written in the buffer memory in units of one display horizontal scanning line during the display scanning period of the channel synchronization signal. , the operation of reading the data in the next horizontal scanning period and writing it to the display memory is repeated during the display scanning period, and the video is read out during the display period of the television synchronization signal to display a small screen moving image on the display screen of the cathode ray tube, and a certain period of time has elapsed. After that, writing of the video signal read from the buffer memory to the display memory is prohibited after exactly one frame worth of video information has been written to the display memory, and the moving image on the small screen is displayed as a still image. According to claim 1, the above-mentioned operation is repeated again to sequentially display the video information of the next channel selected by the channel selection section as a moving image on a small screen at another location on the display screen. The television receiver described.
JP15318585A 1985-07-10 1985-07-10 Television receiver Pending JPS6213172A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15318585A JPS6213172A (en) 1985-07-10 1985-07-10 Television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15318585A JPS6213172A (en) 1985-07-10 1985-07-10 Television receiver

Publications (1)

Publication Number Publication Date
JPS6213172A true JPS6213172A (en) 1987-01-21

Family

ID=15556901

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15318585A Pending JPS6213172A (en) 1985-07-10 1985-07-10 Television receiver

Country Status (1)

Country Link
JP (1) JPS6213172A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63116577A (en) * 1986-11-04 1988-05-20 Matsushita Electric Ind Co Ltd Video signal processor
JPH0294781A (en) * 1988-09-30 1990-04-05 Hitachi Ltd Picture signal processing unit
US4971448A (en) * 1988-07-15 1990-11-20 U.S. Philips Corporation Video signal processing circuit
US5173777A (en) * 1989-10-06 1992-12-22 Siemens Aktiengesellschaft Circuit configuration for inset-image keying in a television set having only one tuner

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63116577A (en) * 1986-11-04 1988-05-20 Matsushita Electric Ind Co Ltd Video signal processor
JPH0748834B2 (en) * 1986-11-04 1995-05-24 松下電器産業株式会社 Video signal processor
US4971448A (en) * 1988-07-15 1990-11-20 U.S. Philips Corporation Video signal processing circuit
JPH0294781A (en) * 1988-09-30 1990-04-05 Hitachi Ltd Picture signal processing unit
US5173777A (en) * 1989-10-06 1992-12-22 Siemens Aktiengesellschaft Circuit configuration for inset-image keying in a television set having only one tuner

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