JPH04117871A - Horizontal trigger pulse changeover circuit - Google Patents

Horizontal trigger pulse changeover circuit

Info

Publication number
JPH04117871A
JPH04117871A JP23748590A JP23748590A JPH04117871A JP H04117871 A JPH04117871 A JP H04117871A JP 23748590 A JP23748590 A JP 23748590A JP 23748590 A JP23748590 A JP 23748590A JP H04117871 A JPH04117871 A JP H04117871A
Authority
JP
Japan
Prior art keywords
section
horizontal
output
pulse
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.)
Granted
Application number
JP23748590A
Other languages
Japanese (ja)
Other versions
JP3049747B2 (en
Inventor
Masahiro Nishi
正弘 西
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP2237485A priority Critical patent/JP3049747B2/en
Publication of JPH04117871A publication Critical patent/JPH04117871A/en
Application granted granted Critical
Publication of JP3049747B2 publication Critical patent/JP3049747B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To prevent horizontal blanking from appearing on a screen by adding a synchronization presence discrimination section using a composite synchronizing signal outputted from a synchronizing separator section as an input signal and selecting the composite synchronizing signal outputted from the synchronizing separator section and a horizontal pulse from a horizontal oscillation section for a horizontal trigger pulse of a clock section. CONSTITUTION:When no television video signal input exists, a horizontal oscillation section 8 reaches the 'self-running oscillation' state and a horizontal blanking pulse of an analog video signal processing section 5 is synchronously with the 'self-running oscillation' of the horizontal oscillation section 8. On the other hand, a synchronizing signal presence discrimination section 10 discriminates the state to be absence of the synchronizing signal and throws a horizontal trigger changeover section to the position of the horizontal pulse from the horizontal oscillation section 8. As a result, the clock section 2 is synchronously with the 'self-running oscillation' of the horizontal oscillation section 8, its converted horizontal synchronizing signal is synchronized and also a deflection section 4 is synchronously therewith. Thus, the horizontal blanking pulse of the analog video signal processing section 5 and the horizontal deflection of the deflection section 4 are synchronized with each other and no blanking pattern appears on the screen due to the absence of the video signal.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、う・イノ′ [1)夕方式走査線変換14ノ
タル・TVのりU/り部水平1リガー パルスに関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an evening scanning line conversion 14-notal TV cursor horizontal 1 rigger pulse.

従来の技術 近年、カシ−・′I■の宣両實化の技術革新は著しい動
きをしている。その中にあって、フィール1 ・フリ、
カー4無くす為、水平1Mf直走査線数/l!、2 (
4bこ変換するl’ A 1. 、’?−1−ミCAi
ν1方式フリンカ−フリー’l’ V 、あるい+;H
、l’j・イン・フリ、カを無くず為に水平走査線・を
侑にし、倍密走^左するクリア・ヒション′1゛v等、
メモリーを使ったy4ジタル信号処理による走内線変換
技術かり、幅に採用されてきている。更に、V l’ 
Ii ’Sの水平同期信号とりl:lマ・サブ手、・リ
アの相関がくJれる非標準(hすに刈する性能同士の為
、 船釣に、このりUツク部&、l: 、  レイン 
口、り方J、(:が大勢り占め−(いる。
Conventional Technology In recent years, there has been a remarkable movement in technological innovation in the promotion and commercialization of Kashi'I■. Among them, feel 1 ・Furi,
To eliminate car 4, horizontal 1Mf direct scanning line number/l! , 2 (
4bConvert l' A 1. ,'? -1-Mi CAi
ν1 method linker-free 'l' V, or +;H
, l'j in-fri, to eliminate the force, the horizontal scanning line is omitted, and the clear histion '1゛v, which is double-fine scanning, etc.
Inner running line conversion technology using Y4 digital signal processing using memory is being adopted for width. Furthermore, V l'
The horizontal synchronization signal of Ii'S is non-standard (because the correlation between the main, sub-hand, and rear is poor). rain
Mouth, way J, (: is in the majority -(there.

以上、図曲−?!:参照しながら、上述した従来のシ・
イン・りしlンク方式走A−線ia換カン−1”Jの中
で、クロック部の水牛1 ’Jカーを中心に説明づる。
That’s it for the illustrations. ! : While referring to the conventional system mentioned above,
I will mainly explain the water buffalo 1'J car in the clock section in the in-link system running A-line IA exchange Kan-1''J.

第2図に於て、1は走り線変換部、2はりIJ 7り部
、3はマIリノクス部、4は偏向部、5ばアナログ映像
信号処理部、〔5は同1υ1分離部、7は車面発11+
4部、)3は水平発振部、9はアノーログ同期パルス発
住部である。
In Fig. 2, 1 is a running line converter, 2 is an IJ7 converter, 3 is a malinox unit, 4 is a deflection unit, 5 is an analog video signal processing unit, [5 is the same 1υ1 separation unit, 7 is 11+ from the car surface
In the fourth part, ) 3 is a horizontal oscillation part, and 9 is an analog synchronization pulse generation part.

以上のよっに構成されたノ・イン・ロンク方式・走査線
変換カラー′F■の動作について説明する。
The operation of the no-in-ron type scanning line conversion color 'F' constructed as described above will be explained.

映像(ミリ処理と同jlIl仏−ル処理の2つに分けて
説明下る。まず、映像信号処理について、j−レビ映像
信号は、アナログ映像(8号処理部5に人力され、y 
、’ c分離、りmlマ復調、Y、I)L、  クラ〉
′フ′アンプフラン4゛ング等の処理をされ、Y(輝度
伝号)と2つの色差信号を出力し、走★、線変換部Iへ
人力サレ、クロック部2つのシステム・クロ。
The explanation will be divided into two parts: video (millimeter processing) and French processing. First, regarding video signal processing, the J-Level video signal is processed by analog video (manufactured by No. 8 processing unit 5,
, 'c separation, rimma demodulation, Y, I)L, cla>
It undergoes processing such as amplifier processing, outputs Y (luminance signal) and two color difference signals, is manually input to the line conversion section I, and is connected to the two system clock sections.

夕で動作するA / 1.、C,1,) 、 △、メモ
リー、ノステム コア 10− プ4等で、走青線変換
され、2つの変換色差(,1ぢ−とY’  (変換輝度
1^号)を出力し、マ]す、クス部;(へ入力され、画
質調整、アンプi/G/1i711ツノクズ等の処理を
、クロック部2のジノン4−ンク り・−7ンブのパル
ス・を用いて行い、Iン/ に /昌出力をCRi’ 
′・出力する。
A/1 that operates in the evening. ,C,1,), △, memory, Nostem Core 10- is converted into a running blue line in the 4th grade, outputs two converted color differences (,1- and Y' (converted luminance 1^), and outputs the map ], the clock section; /Cho output to CRi'
'·Output.

方、同期(を号処理について、テレビ映像信号は、同ル
1分離部6 =・人力され、コンボシフ1 ・カシ・り
を出力し、11r直発振部7.水平発振部8、りし27
2部2.アナログ 同4iパルス発・字部9ハ、人力さ
れ、車面発振部は、卓面パルスをクロ、りJli2−車
面1リカー パルスとして出力すると同時に、アノ−「
]り i;J 1jl(パルス発q−8119へ人力し
、水・(!発(]1、部)(ば、A I’ Co 、、
りした水平パルス変アナログ・同期パルス発生部9−・
入力し、アナ1′、Iグ同朋パルス発生部9は、ハース
トチ゛−I、ブランキンク、クランプの各パルスをアナ
ログ映像信号処理部5−・出力する。り[1ツク部は、
コ〉′ボシン;・シンクの水平1リガー、 jlj直パ
ルスの垂直]リカー・パルスに同期して動作し、走査変
換部lヘジスチム・クロ、り信υ左、71リンクス部3
−変換プランキング、変換り)〉′プ、パルスを、偏向
部4へ変換水平ジンクパルス、変換垂直シンクパルスを
出力し、更に偏向部は、これに同!IJ1シて1〕Y・
を偏向する。
On the other hand, regarding synchronization (signal processing), the TV video signal is manually input to the same unit 1 separation section 6, outputs the combo shift 1, and outputs the 11r direct oscillation section 7, horizontal oscillation section 8, and 27
Part 2 2. Analog 4i pulse generation/character part 9c is manually powered, and the car surface oscillation part outputs the table surface pulse as a black and white pulse, and at the same time outputs the table surface pulse as a black and white pulse.
]ri i;
Horizontal pulse variable analog/synchronous pulse generator 9-・
Analog 1', I-G fellow pulse generating section 9 outputs Hurst check I, blanking, and clamp pulses to analog video signal processing section 5-. [The first part is
・Sink's horizontal 1 rigger, jlj direct pulse's vertical] Operates in synchronization with the liquor pulse, scan converter lhesistim black, rishin υ left, 71 links part 3
-Conversion Planking, Conversion)>'Pulse is output to the deflection unit 4 as a converted horizontal zinc pulse and a converted vertical sync pulse, and the deflection unit also outputs the converted horizontal zinc pulse and the converted vertical sync pulse. IJ1shite1〕Y・
to deflect.

発明か解決しよっとする課題 しがしながり、上記のような構成では、テレビ映像信号
が無信号になった時、同朋分帥部Gのコ〉・ボジントシ
ンク出力は無くなり、水平発振部8はパ自走発振状態°
″にηζす、このパルスから作り出されるアナログ映像
13号処理部5の入カバストゲート フン〉′キン′り
、クラレ′フ゛各パルスとも水平発1;J(部8の゛自
走発振161波数゛に同期する。
However, with the above configuration, when the TV video signal becomes silent, the Bosinto sync output of the branch office G disappears, and the horizontal oscillator 8 is a free-running oscillation state °
The input filter gate of the analog video processing unit 5, No. 13, which is created from this pulse, is horizontal oscillation 1; Synchronize with ゛.

一方、りC17り部2も、コンボッ/[・シンク出力を
水平1′ツガ−として使用している事かり、“′自走発
振状態”とな(〕、これから分周して作られる変換水平
シンクも同様になり、偏向部4もクロ、り部2に同jt
li (、た“自走発振周波数°゛で動作する。この結
果、アナロタ映像15号処理5の水平ブラン牛ンク位相
と偏11・1部4の水平位Eが、非同助と4「す、−I
I同彬1のフラン1ンクが、走貞緑変(Qr′8I+ 
+ 、 71リノクス部32経由し、CR’I’管曲上
、つ4ン1 〕・イバー状に現われる問題が発η;する
On the other hand, since the R C17 R2 also uses the combo/[・sink output as a horizontal 1' hemlock, it is in a "free-running oscillation state" (), and the converted horizontal The sink is the same, the deflection part 4 is also black, and the deflection part 2 is the same.
li (operates at a "free-running oscillation frequency °". As a result, the horizontal blanking phase of the analog image No. 15 processing 5 and the horizontal position E of the offset 11. ,-I
The Fran 1st rank of I Dokin 1 has changed to Sosei Green (Qr'8I+
+, 71 passes through the linox section 32, and on the CR'I' pipe bending, a problem occurs that appears in the form of a 4-in-1].

ここで、ノロ/り部2の水平1リカーパルス・を水平発
振部)(の水平パルス出力変使用すれは、無信号時でも
、クロック部2ば、水平発振部33の水平パルスに同期
し、アナロタ映像1号処理部5の水平フンンギンクIj
’7. tllと偏向部の水平位相は同期し、ソシ〉′
4シンクが、現われるのを防ぐ事かできるが、反曲映1
象信号が存在する時、クロック部4は、垂直発振部7の
出力の垂直I・リカーパルスと水平1リカーとの位相A
で、フィールI゛の出数隅数の判別を行っているが、水
平発振部4の回路179 成上、ヰ1直パルスに比較し
、位相が遅れて、判別に必要な位相関係売値保できず、
フィール10)市、偶の判定ができす、結果として垂直
ノ、夕を起す問題がある。本発明は1−記課題、を解決
するもので、走に線変換1”、Iのクロンク用水平1リ
ガパルスの切替回路を提供するものである。
Here, to change the horizontal pulse output of the horizontal oscillator 33 from the horizontal 1 liquor pulse of the groove/reverse section 2, even when there is no signal, the clock section 2 synchronizes with the horizontal pulse of the horizontal oscillator 33. Horizontal hunching Ij of analog image No. 1 processing unit 5
'7. tll and the horizontal phase of the deflection section are synchronized, and the horizontal phase of the deflection section is synchronized.
4 sync can be prevented from appearing, but reflection 1
When the signal exists, the clock unit 4 detects the phase A of the vertical I liquor pulse and the horizontal liquor pulse output from the vertical oscillation unit 7.
In this case, the number of output corners of the feel I is being determined, but since the circuit 179 of the horizontal oscillation unit 4 is formed, the phase is delayed compared to the I1 direct pulse, and the selling price cannot be maintained due to the phase relationship necessary for determination. figure,
Field 10) It is not possible to judge whether it is even or not, and as a result, there is a problem that it causes vertical or evening. The present invention solves the problem described in item 1-1, and provides a switching circuit for horizontal 1 trigger pulse for horizontal line conversion of 1'' and I for clockwise.

課題を解決するための手段 −1−記問題は解決する為、同1υI′、>離部出力コ
ンボソントシンクを入力1a−jとした同期−h無判別
部’;: m 71[1シ、この出力(5号で、りu7
り部水平1リガーパルスを同期分離部出力のコンボソノ
トシ〉′りと水平発振部水平パルス間で切替えイ、構成
ごこしたものである。
Means for Solving the Problem - 1 - In order to solve the problem, synchronization with 1υI', > separate output combo song synchronization as input 1a-j -h non-discrimination part';: m 71[1si, This output (in issue 5, r u7
The configuration is such that one horizontal rigger pulse of the horizontal oscillator is switched between the combo pulse of the synchronous separator output and the horizontal pulse of the horizontal oscillator.

作用 本発明は、i−記しまた構成により、映)像信号の人力
が無い場合は、20.り部の水平1リガーは、水平発振
部水牛パルスを使用し7、アナロタ映像i^号処理部の
フランキング水平位相と偏向部の位相カ同  となり、
フ)ンキ〉′り肉か、出画するのを防いでおり、又、映
像情号の入力がある場合は、クロック部の水平1リガー
は、同期部コンボジン[−・シンクを使用し、垂直1フ
ガー・パルスとの奇偶フィール10判定117相をIL
確に薙保し、j1確な判定が行なわれ、垂直ソノターを
防ぎ、2つの問題点を矛盾する事なく解決することがで
きる。
Effects of the present invention are as follows: 1. Also, due to the configuration, if there is no human power for the video signal, 20. The horizontal 1 rigger in the rear section uses the water buffalo pulse of the horizontal oscillation section7, and the flanking horizontal phase of the analog image processing section and the phase of the deflection section are the same.
In addition, when video information is input, the horizontal 1 rigger of the clock section is connected to the vertical IL 117 phase of odd-even feel 10 judgment with 1 fugger pulse
The two problems can be solved without contradicting each other by making precise judgments and preventing vertical sonotars.

実施例 以上、本発明の−・実施例について、図面を参照しなが
ら説明する。
Embodiments As described above, embodiments of the present invention will be described with reference to the drawings.

第1図は、本発明の実施例に於ける「走査線変換′I′
Mの1インクル信号処理部用水平トリガパルス切替回路
jのブロック図・を示すものである。
FIG. 1 shows "scan line conversion 'I'" in an embodiment of the present invention.
2 is a block diagram of a horizontal trigger pulse switching circuit j for a 1-inch signal processing section of M.

第1図に於゛ζ、1〜9は、第2図と同様の内容であり
、■は走古線変換部、2はクロック部、()ば71す、
クス部、4は偏向部、5はアナログ信号処理部、fしは
同期分離部、7は垂直発振部、8は水゛(−発振部、9
はアナロク同期パルス発生部、10は回!lJI信弓り
無判別部、11は水平1リカー・+−JJ替部である。
In FIG. 1, ゛ζ, 1 to 9 have the same contents as in FIG.
4 is a deflection section, 5 is an analog signal processing section, f is a synchronization separation section, 7 is a vertical oscillation section, 8 is a water (-oscillation section, 9
is the analog synchronous pulse generator, and 10 is the number of times! 11 is the horizontal 1 liquor +-JJ replacement part.

以上のよ−)に構成された1走看線変換’l” V (
2) r゛インタル伝号処理部りL27り用水+1リガ
ー ・ルス切替回路」について、以上その動作について
説明する。
The above-mentioned one-stroke line transformation 'l'' V (
2) The operation of the r゛internal signal processing unit L27 water + 1 rigger/rus switching circuit'' will be described above.

1〜9の構成の基本動作については従来例と同様の為、
省略し、ここでは、同期分離部6.水平発振部8.アナ
ロク映像信号処理部5.クロンク部2.偏回部4.同期
信号有無判別部1()、水平1リ力−切替部11の関係
を重点的に説明する。
The basic operations of configurations 1 to 9 are the same as the conventional example, so
The synchronization separation unit 6. is omitted here. Horizontal oscillation section 8. Analog video signal processing section 5. Cronk part 2. Deviation part 4. The relationship between the synchronizing signal presence/absence determining section 1 ( ) and the horizontal 1 repower switching section 11 will be mainly explained.

最初にテレヒ映像信号人力が存在する場合の動作を考え
る。同期分離6は、コンポジ’71 ・シ〉・りを出力
し、垂直発振部7.水平発振部8.同期有無判別部1(
J、水平1リ力切替部−・出力し、同ル1有無判別部I
nは、同1Ilj有りと判定し、水平11)ガ切替部を
同1υ1分離部6の出力側に倒し、クロック部2の水平
1リガーは、コンポジットシンクとなる。この結果、垂
直発振部゛7の出力垂直1リガーとの白偶数フ□・−ル
1の位相関係は、止も会なもの々なり、クロック部2の
心偶数フィール1判定は正確に行われ、垂直シンターは
、現われなLX0次に、)〜レヒ映像信号ノN力か71
・在しない場合Q)動作4考える。同期分離部すの出力
は無くなり、水牛発振部)3は“目止発振゛状態となり
、アナログ映像信号処理部5の水平ブランキンク・パル
スも水平発振部130)“自走発振”に同期したもの七
なる。−・方、同期(信杼有無判別部IOは、同期分離
部5の出力が入力されているので、同期無しと判別し、
水平1リ力−切替部を水平発振部)3の水平パルス側に
倒す。この結果、クロック部2の水平1リカーは“自走
発振“の水平パルスが入力され、クロ、り部2は、この
水平発振部)(の“′自走発振パに同期され、その変換
水平シ〉′りも同期され、更に1編向部・1もこれCご
同!Il+する。
First, let us consider the operation when there is a human input for the television video signal. The synchronous separation unit 6 outputs a composite '71 signal, and the vertical oscillation unit 7. Horizontal oscillation section 8. Synchronization presence/absence determination unit 1 (
J, Horizontal 1 re-force switching section - Output, same 1 re-force switching section I
n determines that the same 1Ilj is present, the horizontal 11) switching unit is moved to the output side of the 1υ1 separation unit 6, and the horizontal 1 rigger of the clock unit 2 becomes a composite sync. As a result, the phase relationship between the output vertical 1 rigger of the vertical oscillator section 7 and the white even number field 1 is unreasonable, and the clock section 2's determination of the center even number field 1 is not accurate. , the vertical sinter appears as L
- If it does not exist Q) Think about action 4. The output of the synchronization separation section disappears, and the water buffalo oscillation section) 3 enters the "stop oscillation" state, and the horizontal blanking pulse of the analog video signal processing section 5 is also synchronized with the horizontal oscillation section 130) "free-running oscillation". -, synchronization (since the output of the synchronization separator 5 is input to the synchronous presence/absence determination unit IO, it determines that there is no synchronization,
Horizontal 1 re-force - Move the switching section to the horizontal pulse side of horizontal oscillation section) 3. As a result, the horizontal pulse of the "free-running oscillation" is input to the horizontal 1 liquor of the clock section 2, and the clock section 2 is synchronized with the "' free-running oscillation pulse of this horizontal oscillation section), and the horizontal pulse of the horizontal The sheaths are also synchronized, and the 1st knitting section 1 also does the same thing as C!Il+.

従って、アナログ映像信号処理部5の水平)〉ン4−ン
クと、偏向部4の水牛偏量が同期した状態となり、フラ
ンキングl中1が、e i& L;υ無しで、現れない
Therefore, the horizontal angle of the analog video signal processing section 5 and the amount of buffalo deflection of the deflection section 4 are synchronized, and 1 in flanking 1 does not appear without e i &L; υ.

このよつに、本実施例によれは、同g、11有無判別部
き、この出力伝号で、同期分離出力のコンボン7トソン
クと水平発振部の水平パルスを切替で、クロック部へ・
供給する水’+!−1リガー・パルス切4を回路を設け
る事(こより、映像1イ吋人力の無い状態で、水平ブう
ンキング向が出画するのを防止基る事ができる。
In this way, according to this embodiment, the presence/absence determining section G, 11 is provided, and this output signal is used to switch between the combination 7 pulse of the synchronization separation output and the horizontal pulse of the horizontal oscillation section, and send it to the clock section.
Supply water'+! -1 rigger pulse cut-off circuit 4 is provided (this can prevent the image from appearing in the horizontal blowing direction when there is no human power for the image 1).

発明の効果 以上の実施例から明らかなように、本発明によれは、水
平フランキンクか円曲に現われるこ七がないよつに水平
発振部の水平パルスを切替でクロック部−・供給する水
平1リガー・パルス切替lpJ路を提供できる。
Effects of the Invention As is clear from the above-described embodiments, the present invention provides a clock section which supplies horizontal pulses of the horizontal oscillation section by switching between horizontal pulses appearing in a horizontal flank or a circular curve. A rigger pulse switching lpJ path can be provided.

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

第1図は、本発明の実施例にゲ・る「走A線変換る。 1・・・・・・走査線変換部、2・・・・・・クロック
部、3・・71リンクス部、4・・・・・・偏向部、5
・・・・・アナコク1d連部理部、b・・・・・・同期
分離部、7・・・・・・市直発振部、)3・・・・・・
水平発振部、9・・・・アナログ同期パルス発11J(
部、10・・・・・・同!’Jl 11号有無判別部、
11・・・・・水平1リガ一切替部。
FIG. 1 shows an embodiment of the present invention that performs scanning A-line conversion. 1...Scanning line conversion unit, 2...Clock unit, 3...71 links unit, 4... Deflection section, 5
...Anakoku 1d connection science department, b...Synchronization separation section, 7...City direct oscillation section,)3...
Horizontal oscillation section, 9...Analog synchronous pulse generation 11J (
Part 10... Same! 'Jl No. 11 presence/absence determination section,
11...Horizontal 1 rig change section.

Claims (1)

【特許請求の範囲】[Claims] アナログ復調後の色差、輝度両信のライン、ロック、走
査線変換映像ディジタル信号処理部(以後、走査線変換
部と略す。)と、アナログの同期分離部のコンポジット
・シンク、垂直発振部の出力を水平、垂直トリガー・パ
ルスとして使用し、走査線変換部のシステム・クロック
あるいは、後続する偏向部、マトリックス部への走査線
変換の水平、垂直両同期信号並びにブランキング、クラ
ンプ両パルスを発生するPLLライン・ロック・クロッ
ク部(以後クロック部と略す)と、カラーTV映像信号
入力からY/C分離、クロマ復調、Y・DL、クランプ
、ブランギング、アンプ等の処理を行い、輝度と2つの
色差信号を出力するアナログ映像信号処理部(以後、ア
ナログ映像信号処理部と略す。)と、カラーTV映像信
号からアナログ・同期分離する同期分離部(以後、同期
分離部と略す。)と、この出力に同期する垂直発振部と
、同期分離出力にAFCロックする水平発振部と、同期
分離部、水平、垂直発振部の出力信号よりバースト・ゲ
ート、クリンプ、ブランキングのアナログ復調に必要な
アナログ同期パルス発生部と、クロック部出力の走査線
変換水平、垂直両同期信号により駆動される偏向部と、
走査線変換部出力の走査線変換輝度信号(以後、Y’と
略す。)と走査線変換の2つの色差信号を入力信号とし
、R/G/Bマトリックスし、CRT、ドライブするマ
トリックス部と、同期分離出力を使用した入力TV映像
信号の有無判別部(以後、同期信号有無判別部)と、こ
の出力信号で、同期分離部出力のコンポジット・シンク
と、水平発振部の水平パルスとを切替えて、クロック部
へ供給する水平トリガーパルス切替回路とを備え、映像
信号無入力時に水平発振部の水平パルス出力を、映像信
号入力時には同期分離部のコンポジット同期信号出力を
、クロック部水平トリガーパルスとして切替え、映像信
号、無入力時に、コンポジット同期出力が無くなり、ク
ロック部が水平、フリー・ラン状態となり、その出力を
使用した偏向部もこの水平フリーラン周波数分周出力で
動作し、水平発振部出力を使用したアナログ同期パルス
と水平レートで非同期の関係となり、これらを使用した
アナログ映像信号処理部と偏向回路も非同期となり、画
面上に映像信号のウィンド・ワイパー状態のブランキン
グ画が現われるのを防止する事を特徴とした水平トリガ
ー・パルス切替回路。
Line, lock, and scanning line conversion of color difference and luminance signals after analog demodulation Video digital signal processing section (hereinafter referred to as scanning line conversion section), composite sync of analog synchronization separation section, and output of vertical oscillation section are used as horizontal and vertical trigger pulses to generate both the horizontal and vertical synchronization signals and both blanking and clamp pulses for the system clock of the scan line converter or the scan line converter for the subsequent deflection and matrix sections. The PLL line lock clock section (hereinafter abbreviated as the clock section) performs processing such as Y/C separation, chroma demodulation, Y/DL, clamp, blanging, amplifier, etc. from the color TV video signal input, and performs processing such as luminance and two color differences. An analog video signal processing section (hereinafter abbreviated as analog video signal processing section) that outputs a signal, a synchronous separation section (hereinafter abbreviated as synchronous separation section) that separates analog and synchronous from a color TV video signal, and this output A vertical oscillation section that synchronizes with the synchronous separation output, a horizontal oscillation section that AFC locks to the synchronous separation output, and analog synchronous pulses necessary for analog demodulation of burst gate, crimp, and blanking from the output signals of the synchronous separation section, horizontal, and vertical oscillation sections. a generating section, and a deflection section driven by both scanning line conversion horizontal and vertical synchronization signals output from the clock section;
A matrix section that uses a scanning line conversion luminance signal (hereinafter abbreviated as Y') output from a scanning line conversion section and two color difference signals of the scanning line conversion as input signals, converts them into an R/G/B matrix, and drives the CRT; A section for determining the presence or absence of an input TV video signal using a sync separation output (hereinafter referred to as a sync signal presence/absence discriminating section) uses this output signal to switch between the composite sync of the sync separation section output and the horizontal pulse of the horizontal oscillation section. , a horizontal trigger pulse switching circuit that supplies to the clock section, switches the horizontal pulse output of the horizontal oscillation section when no video signal is input, and the composite synchronization signal output of the sync separation section when a video signal is input, as the horizontal trigger pulse of the clock section. , when no video signal is input, the composite synchronization output disappears, the clock section enters a horizontal, free-run state, and the deflection section that uses that output also operates with this horizontal free-run frequency divided output, and the horizontal oscillation section output The analog synchronization pulse used and the horizontal rate are asynchronous, and the analog video signal processing unit and deflection circuit that use these are also asynchronous, preventing a blanking image of the video signal from appearing on the screen in a window wiper state. A horizontal trigger/pulse switching circuit featuring:
JP2237485A 1990-09-07 1990-09-07 Horizontal trigger / pulse switching circuit Expired - Fee Related JP3049747B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2237485A JP3049747B2 (en) 1990-09-07 1990-09-07 Horizontal trigger / pulse switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2237485A JP3049747B2 (en) 1990-09-07 1990-09-07 Horizontal trigger / pulse switching circuit

Publications (2)

Publication Number Publication Date
JPH04117871A true JPH04117871A (en) 1992-04-17
JP3049747B2 JP3049747B2 (en) 2000-06-05

Family

ID=17016026

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2237485A Expired - Fee Related JP3049747B2 (en) 1990-09-07 1990-09-07 Horizontal trigger / pulse switching circuit

Country Status (1)

Country Link
JP (1) JP3049747B2 (en)

Also Published As

Publication number Publication date
JP3049747B2 (en) 2000-06-05

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