JPH04180363A - Television receiver - Google Patents

Television receiver

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Publication number
JPH04180363A
JPH04180363A JP30923490A JP30923490A JPH04180363A JP H04180363 A JPH04180363 A JP H04180363A JP 30923490 A JP30923490 A JP 30923490A JP 30923490 A JP30923490 A JP 30923490A JP H04180363 A JPH04180363 A JP H04180363A
Authority
JP
Japan
Prior art keywords
period
output
aspect ratio
signal
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
Application number
JP30923490A
Other languages
Japanese (ja)
Inventor
Yuichi Kubo
久保 裕一
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 JP30923490A priority Critical patent/JPH04180363A/en
Publication of JPH04180363A publication Critical patent/JPH04180363A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To always reproduce a video with high quality by cutting the electron beam of a picture tube equivalent to an excessive overscan component by generating a blanking signal in accordance with the aspect ratio of a video signal. CONSTITUTION:When the video signal with aspect ratio of 4:3 is inputted to a television receiver with aspect ratio of screen is 16:9, the output of a first comparator 6 goes to an H level during a period over the first reference voltage V1 of the terminal voltages of a feedback resistor 4, and a pulse which sets the period as a vertical blanking signal period newly is outputted. Similarly, the output of a second comparator 9 goes to the H level in the period over the second reference voltage V2 of the terminal voltages of the feedback resistor 4, and a pulse which sets the period as the vertical blanking signal period newly is outputted. The output of a third comparator 12 goes to the H level only in the pump-up period of the output voltage of a vertical output amplifier 2, and a pulse equivalent to an original vertical blanking signal period can be outputted.

Description

【発明の詳細な説明】 皮1ユJ1リ』1顆 本発明は、画面のアスペクト比(縦横比)と一致しない
映像信号が入力されるテレビジョン受像機に関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television receiver to which a video signal that does not match the aspect ratio of the screen is input.

従来の技術 従来、テレビジョン受像機はその画面のアスペクト比が
4=3になっており、そのテレビジョン受像機に入力さ
れる映像信号、例えば受信アンテナや外部映像機器から
人力される映像信号のアスペクト比も4:3になってい
た。そして、その垂直方向のオーバースキャンは上下と
も10%程度になっていた。
BACKGROUND OF THE INVENTION Conventionally, a television receiver has a screen with an aspect ratio of 4=3, and the video signal input to the television receiver, such as a video signal manually input from a receiving antenna or external video equipment, is The aspect ratio was also 4:3. The vertical overscan was about 10% both above and below.

また、斯るテレビジョン受像機ではその水平。Also, in such television receivers, the level.

垂直偏向の帰線期間に受像管の電子ビームが出力されて
いると、画面に帰線があらわれて見苦しくなるので、水
平,垂直帰線期間には受像管の電子ビームが出力されな
いようにしていた。具体的には、帰線消去回路を設けて
、水平.垂直出力回路より取り出した水平,垂直帰線消
去信号(プランキング信号)に基づいて受像管をカント
オフするようにしていた。
If the electron beam from the picture tube was output during the retrace period of vertical deflection, a retrace line would appear on the screen, making it unsightly, so the electron beam from the picture tube was not output during the horizontal and vertical retrace periods. . Specifically, a blanking circuit is provided to horizontally erase the line. The picture tube was canted off based on horizontal and vertical blanking signals (blanking signals) extracted from the vertical output circuit.

日が”しようと るう ところが、最近アスペクト比が4=3の映像信号を送信
する従来の放送とは別に、アスペクト比が16:9の映
像信号を送信するワイドアスペクト放送が提案されてお
り、それに対応してテレビジョン受像機もアスペクト比
が16=9のワイド画面のものが提案されている。その
ため、テレビジョン受像機にその画面のアスペクト比と
一致しない映像信号が入力される場合が生じ、例えば画
面のアスペクト比が16:9のテレビジョン受像機でア
スペクト比が4:3の映像信号を受信する場合には、第
3図のようにその映像信号によって形成されるラスタ(
A)と画面(B)の水平サイズを合わせると、垂直サイ
ズとしては太き(なり過ぎて画面(B)に対する垂直方
向の過剰オーバースキャンを生じ、例えば第4図のよう
に受像管(CRT)の周辺に当った電子ビームが蛍光面
にはね返って所謂ハレーションを止し画質劣化やガラス
バルブの破損等を引き起こしていた。
However, in addition to conventional broadcasting that transmits video signals with an aspect ratio of 4:3, wide aspect broadcasting that transmits video signals with an aspect ratio of 16:9 has recently been proposed. Correspondingly, wide-screen television receivers with an aspect ratio of 16=9 have been proposed.As a result, video signals that do not match the aspect ratio of the screen may be input to the television receiver. For example, when a television receiver with a screen aspect ratio of 16:9 receives a video signal with an aspect ratio of 4:3, the raster (
When the horizontal sizes of A) and screen (B) are combined, the vertical size becomes too thick (excessive overscanning in the vertical direction with respect to screen (B)), for example, as shown in Figure 4, the picture tube (CRT) The electron beam that hit the periphery of the phosphor bounced off the phosphor screen, causing so-called halation, which caused deterioration in image quality and damage to the glass bulb.

本発明はこのような点に鑑み成されたものであって、直
面のアスペクト比と一致しない映像信号が入力されても
、ハレーションによる画質劣化等を引き起さないように
したテレビジョン受像機を提供することを目的とする。
The present invention has been made in view of these points, and provides a television receiver that does not cause image quality deterioration due to halation even if a video signal that does not match the aspect ratio of the surface is input. The purpose is to provide.

量 を” するための 上記の目的を達成するため本発明では、画面のアスペク
ト比と一致しない映像信号が人力されるテレビジョン受
像機において、入力される映像信号のアスペクト比に応
じた帰線消去信号を生成すZ・”信号発生手段を設けた
構成としたもので、具体も、二前記信号発生手段は、偏
向コイルと直列に接続され、入力される映像信号によっ
て形成されるラスタ・サイズに応じた振幅の偏向電流が
流れる抵抗の両端電圧に基づいて帰線消去信号を生成す
るもので、抵抗の両端電圧の振幅が所定レベル以上の期
間を帰線消去信号期間として設定する期間設定部を有す
るものである。
In order to achieve the above-mentioned object of reducing the amount of noise, the present invention provides blanking according to the aspect ratio of the input video signal in a television receiver in which a video signal that does not match the aspect ratio of the screen is input manually. The system is equipped with a Z-signal generating means that generates a signal. Specifically, the two signal generating means are connected in series with the deflection coil, and are arranged in a raster size formed by an input video signal. The blanking signal is generated based on the voltage across the resistor through which the deflection current of the corresponding amplitude flows, and includes a period setting section that sets the period during which the amplitude of the voltage across the resistor is equal to or higher than a predetermined level as the blanking signal period. It is something that you have.

作用 このような構成によると、画面のアスペクト比と一致し
ない映像信号が入力された際に、信号発生手段からの帰
線消去信号により、水平或いは垂直方向の過剰オーバー
スキャン分における受像管の電子ビームが自動的にカッ
トされることになる。
Effect: According to this configuration, when a video signal that does not match the aspect ratio of the screen is input, the blanking signal from the signal generating means is used to control the electron beam of the picture tube in the excessive overscan in the horizontal or vertical direction. will be automatically cut.

裏」L炎 以下、本発明の一実施例について図面と共に説明する。Back” L flame An embodiment of the present invention will be described below with reference to the drawings.

本実施例では、入力される映像信号のアスペクト比に応
じた帰線消去信号を生成する信号発生手段を設けて、画
面のアスペクト比と一致しない映像信号が入力された際
に、水平或いは垂直方向の過剰オーバースキャン分にお
ける受像管の電子ビームを帰線消去信号によりカットす
るようにしたものである。
In this embodiment, a signal generating means is provided to generate a blanking signal according to the aspect ratio of the input video signal, and when a video signal that does not match the aspect ratio of the screen is input, The electron beam of the picture tube in the excessive overscan portion is cut by a blanking signal.

例えば、画面のアスペクト比が16:9のテレビジタン
受像機において、そのアスペクト比と一致した映像信号
以外に、アスペクト比が4:3の映像信号が入力される
場合、その映像信号によって形成されるラスタと画面の
水平サイズを合わせると垂直方向の過剰オーバースキャ
ンを生じることになるが、アスペクト比4:3の映像信
号に応じた、即ちその映像信号によって形成されるラス
タの垂直サイズに応じた垂直帰線消去信号を生成するこ
とで、過剰オーバースキャン分に相当する受像管の電子
ビームがカットされることになる。
For example, in a television receiver with a screen aspect ratio of 16:9, if a video signal with an aspect ratio of 4:3 is input in addition to a video signal matching that aspect ratio, the image will be formed by that video signal. If the raster and the horizontal size of the screen are matched, excessive overscanning will occur in the vertical direction, but the vertical By generating the blanking signal, the electron beam of the picture tube corresponding to the excessive overscan is cut off.

第1図は人力される映像信号のアスペクト比に応じた垂
直帰線消去信号を生成する信号発生手段(1)の具体的
な回路構成例を示し、(2)はIC化されたB級プッシ
ュプル方式の垂直出力アンプ、(3)は垂直出力アンプ
(2)からの出力により垂直偏向電流(人力される映像
信号によって形成されるラスタの垂直サイズに応じた振
幅の鋸歯状波電流)が流れる垂直偏向コイル、(4)は
垂直偏向コイル(3)と結合コンデンサ(5)を介して
直列に接続された帰還抵抗で、垂直偏向電流によって生
しる両端電圧(鋸歯状波電圧)を負帰還用電圧として垂
直出力アンプ(2)前段の垂直駆動回路(図示せず)に
供給するようになっている。(6)はバッファアンプ(
7)を介した帰還抵抗(4)の両端電圧とツェナーダイ
オード(8)により決定される第1基準電圧ν1(ツェ
ナー電圧)とを比較しその両端電圧が第1基準電圧vl
より大きくなった際にのみその出力がHレベルとなる第
1コンパレータ、(9)は反転アンプ(10)にて極性
が反転された帰還抵抗(4)の両端電圧とツェナーダイ
オード(11)により決定される第2基準電圧v2(′
ツェナー電圧)とを比較しその両端電圧が第2基準電圧
v2より大きくなった際にのみその出力がHレベルとな
る第2コンパレータ、(12)は垂直出力アンプ(2)
からの出力電圧とツェナーダイオード(13)により決
定される第3基準電圧V3 (ツェナー電圧)とを比較
してその出力電圧が第3基準電圧V、より大きくなった
際にのみその出力がHレベルとなる第3コンパレータで
ある。ここで、第3基準電圧v3は入力される映像信号
のアスペクト比に関係なく垂直出力アンプ(2)からの
出力電圧のポンプアップ期間(映像信号本来の垂直帰線
消去信号期間に相当)でのみ第3コンパレータ(12)
からHレベルの出力が得られるように設定されているも
のとする(第2図(a)参照)。また、第1.第2基準
電圧Vl+v2は入力される映像信号のアスペクト比が
16:9の場合にその帰還抵抗(4)の両端電圧よりも
大きくなるように設定されているものとする。そして、
(14)は第1.第2.第3コンパレータ(6) (9
) (12)からの出力のオアを取り垂直帰線消去信号
として出力するOR回路である。
Figure 1 shows a specific example of the circuit configuration of the signal generating means (1) that generates a vertical blanking signal according to the aspect ratio of the manually inputted video signal, and (2) shows an example of a B-class pushbutton using an IC. A pull-type vertical output amplifier (3) causes a vertical deflection current (a sawtooth wave current with an amplitude corresponding to the vertical size of the raster formed by the human input video signal) to flow due to the output from the vertical output amplifier (2). The vertical deflection coil (4) is a feedback resistor connected in series with the vertical deflection coil (3) via the coupling capacitor (5), which provides negative feedback for the voltage at both ends (sawtooth wave voltage) generated by the vertical deflection current. The voltage is supplied as a voltage to a vertical drive circuit (not shown) in front of the vertical output amplifier (2). (6) is the buffer amplifier (
The voltage across the feedback resistor (4) via the feedback resistor (4) and the first reference voltage ν1 (Zener voltage) determined by the Zener diode (8) are compared, and the voltage across the feedback resistor (4) is determined as the first reference voltage vl.
The first comparator (9) whose output becomes H level only when the voltage becomes higher than that of the first comparator (9) is determined by the voltage across the feedback resistor (4) whose polarity is inverted by the inverting amplifier (10) and the Zener diode (11). The second reference voltage v2('
A second comparator whose output becomes H level only when the voltage across it becomes higher than the second reference voltage v2, (12) is a vertical output amplifier (2)
The output voltage is compared with the third reference voltage V3 (Zener voltage) determined by the Zener diode (13), and only when the output voltage becomes greater than the third reference voltage V, the output becomes H level. This is the third comparator. Here, the third reference voltage v3 is applied only during the pump-up period of the output voltage from the vertical output amplifier (2) (corresponding to the original vertical blanking signal period of the video signal), regardless of the aspect ratio of the input video signal. Third comparator (12)
It is assumed that settings are made so that an H level output is obtained from (see FIG. 2(a)). Also, 1st. It is assumed that the second reference voltage Vl+v2 is set to be larger than the voltage across the feedback resistor (4) when the aspect ratio of the input video signal is 16:9. and,
(14) is the first. Second. Third comparator (6) (9
) This is an OR circuit that takes the OR of the output from (12) and outputs it as a vertical blanking signal.

従って、画面のアスペクト比が16:9のテレビジョン
受像機において、アスペクト比が4:3の映像信号が入
力される場合には、前述したように画面に対するラスタ
の垂直サイズが通常よりも大きくなり、垂直偏向コイル
(3)に流れる垂直偏向電流の振幅も垂直サイズに応じ
て(即ち、16:9のアスペクト比の場合よりも)大き
くなるため、その偏向電流によって生じる帰還抵抗の両
端電圧の正負の振幅も第1.第2基準電圧V、、 V、
より大きくなる。そのため、第1コンパレータ(6)は
第2図(b)に示すようにバッファアンプ(7)を介し
た帰還抵抗(4)の両端電圧の第1基準電圧v1以上の
期間でその出力がHレベルとなって、この期間を新たに
垂直帰線消去信号期間として設定する第2図(d)に示
すようなパルスを出力することになる。同様に、第2コ
ンパレータ(9)も第2図(c)に示すように反転アン
プ(10)を介した帰還抵抗(4)の両端電圧の第2基
準電圧v2以上の期間でその出力がHレベルとなって、
この期間を新たに垂直帰線消去信号期間として設定する
第2図(e)に示すようなパルスを出力することになる
。そして、第3コンパレータ(12)は第2図(a)に
示すように垂直出力アンプ(2)の出力電圧のポンプア
ップ期間でのみその出力がHレベルとなって、本来の垂
直帰線消去信号期間に相当する第2図(f)に示すよう
なパルスを出力することになる。そのため、これら第1
.第2コンパレータ(6) (9)の出力と第3コンパ
レータ(12)の出力のオアを取るOR回路(14)か
らは、本来の垂直帰線消去信号期間よりも垂直方向の過
剰オーバースキャン分だけ前後に広がった第2図(g)
のようなパルスが垂直帰線消去信号として出力されるこ
とになる。
Therefore, when a video signal with an aspect ratio of 4:3 is input to a television receiver with a screen aspect ratio of 16:9, the vertical size of the raster with respect to the screen will be larger than usual, as described above. , the amplitude of the vertical deflection current flowing through the vertical deflection coil (3) also increases depending on the vertical size (i.e., compared to the case of an aspect ratio of 16:9), so the positive and negative voltages across the feedback resistor caused by the deflection current increase. The amplitude of is also the first. Second reference voltage V,, V,
Become bigger. Therefore, as shown in FIG. 2(b), the output of the first comparator (6) is at H level during the period when the voltage across the feedback resistor (4) via the buffer amplifier (7) is equal to or higher than the first reference voltage v1. Therefore, a pulse as shown in FIG. 2(d) is output, which sets this period as a new vertical blanking signal period. Similarly, as shown in FIG. 2(c), the output of the second comparator (9) becomes H during the period when the voltage across the feedback resistor (4) via the inverting amplifier (10) is equal to or higher than the second reference voltage v2. It becomes a level,
This period is newly set as a vertical blanking signal period, and a pulse as shown in FIG. 2(e) is output. As shown in FIG. 2(a), the output of the third comparator (12) becomes H level only during the pump-up period of the output voltage of the vertical output amplifier (2), and the output becomes the original vertical blanking signal. A pulse as shown in FIG. 2(f) corresponding to the period is output. Therefore, these first
.. From the OR circuit (14) that ORs the output of the second comparator (6) (9) and the output of the third comparator (12), an amount corresponding to the excessive overscan in the vertical direction than the original vertical blanking signal period is output. Figure 2 (g) spread out from front to back
A pulse like this will be output as a vertical blanking signal.

尚、画面のアスペクト比16:9と一致した映像信号が
入力される場合には、第1.第2コンパレータ(6) 
(9)からのパルス出力がなくなるため、OR回路(1
4)からは第3コンパレータ(12)からのパルス出力
がそのまま垂直帰線消去信号として出力されることにな
る。
Note that when a video signal matching the screen aspect ratio of 16:9 is input, the first. Second comparator (6)
Since the pulse output from (9) disappears, the OR circuit (1
4), the pulse output from the third comparator (12) is directly output as a vertical blanking signal.

上記した本実施例では、アスペクト比が16:9の画面
においてアスペクト比が16:9と4:3の映像信号が
入力される場合について述べたが、例えばアスペクト比
が4:3の画面においてアスペクト比が16:9の映像
信号が入力される場合でも同しで、その場合水平方向の
過剰オーバースキャン分に相当する受像管の電子ビーム
をカットするために映像信号のアスペクト比に応じた水
平帰線消去信号が生成されることになる。
In the above-mentioned embodiment, a case was described in which video signals with an aspect ratio of 16:9 and 4:3 are input on a screen with an aspect ratio of 16:9. The same applies when a video signal with a ratio of 16:9 is input; in that case, the horizontal return is adjusted according to the aspect ratio of the video signal in order to cut off the electron beam of the picture tube corresponding to the excessive horizontal overscan. A line erasure signal will be generated.

衾肌■侠果 上述した如く本発明のテレビジョン受像機に依れば、画
面のアスペクト比と一致しない映像信号が入力されても
、その映像信号のアスペクト比に応じた帰線消去信号を
生成して過剰オーバースキャン分に相当する受像管の電
子ビームをカットするようにしているので、常に高品位
な映像を再現することが出来る。
As described above, according to the television receiver of the present invention, even if a video signal that does not match the aspect ratio of the screen is input, a blanking signal is generated according to the aspect ratio of the video signal. Since the electron beam of the picture tube corresponding to the excessive overscan is cut off, high-quality images can always be reproduced.

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

第1図は本発明を実現するための具体的な回路構成例を
示す図、第2図はその各部の信号波形図、第3図は画面
に対する垂直方向の過剰オーバースキャンを示す図、第
4図は垂直方向の過剰オーバースキャンによるハレーシ
ョンを説明するための図である。 (1)・−・信号発生手段、 (3) −・−垂直偏向
コイル。 (4)・−帰還抵抗。 (6) (9) (12)−・・第1.第2.第3コン
パレータ。 (14)・・・OR回路。
FIG. 1 is a diagram showing a specific circuit configuration example for realizing the present invention, FIG. 2 is a signal waveform diagram of each part, FIG. 3 is a diagram showing excessive overscan in the vertical direction with respect to the screen, and FIG. The figure is a diagram for explaining halation caused by excessive overscanning in the vertical direction. (1) --- Signal generating means, (3) --- Vertical deflection coil. (4)・-Feedback resistance. (6) (9) (12) --- 1st. Second. Third comparator. (14)...OR circuit.

Claims (3)

【特許請求の範囲】[Claims] (1)画面のアスペクト比と一致しない映像信号が入力
されるテレビジョン受像機において、入力される映像信
号のアスペクト比に応じた帰線消去信号を生成する信号
発生手段を設けたことを特徴とするテレビジョン受像機
(1) A television receiver to which a video signal that does not match the aspect ratio of the screen is input is characterized by being provided with a signal generating means for generating a blanking signal according to the aspect ratio of the input video signal. television receiver.
(2)前記信号発生手段は、偏向コイルと直列に接続さ
れ、入力される映像信号によって形成されるラスタ・サ
イズに応じた振幅の偏向電流が流れる抵抗の両端電圧に
基づいて帰線消去信号を生成することを特徴とする第1
請求項に記載のテレビジション受像機。
(2) The signal generating means is connected in series with the deflection coil and generates a blanking signal based on a voltage across a resistor through which a deflection current having an amplitude corresponding to the raster size formed by the input video signal flows. A first method characterized by generating
A television receiver according to the claims.
(3)前記信号発生手段は、前記抵抗の両端電圧の振幅
が所定レベル以上の期間を帰線消去信号期間として設定
する期間設定部を有することを特徴とする第2請求項に
記載のテレビジョン受像機。
(3) The television according to claim 2, wherein the signal generating means includes a period setting section that sets a period in which the amplitude of the voltage across the resistor is equal to or higher than a predetermined level as a blanking signal period. receiver.
JP30923490A 1990-11-14 1990-11-14 Television receiver Pending JPH04180363A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30923490A JPH04180363A (en) 1990-11-14 1990-11-14 Television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30923490A JPH04180363A (en) 1990-11-14 1990-11-14 Television receiver

Publications (1)

Publication Number Publication Date
JPH04180363A true JPH04180363A (en) 1992-06-26

Family

ID=17990545

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30923490A Pending JPH04180363A (en) 1990-11-14 1990-11-14 Television receiver

Country Status (1)

Country Link
JP (1) JPH04180363A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05328165A (en) * 1992-05-20 1993-12-10 Victor Co Of Japan Ltd Vertical blanking signal generating circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05328165A (en) * 1992-05-20 1993-12-10 Victor Co Of Japan Ltd Vertical blanking signal generating circuit

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