JPH04165767A - Video composite synchronizing signal separation circuit - Google Patents

Video composite synchronizing signal separation circuit

Info

Publication number
JPH04165767A
JPH04165767A JP29161290A JP29161290A JPH04165767A JP H04165767 A JPH04165767 A JP H04165767A JP 29161290 A JP29161290 A JP 29161290A JP 29161290 A JP29161290 A JP 29161290A JP H04165767 A JPH04165767 A JP H04165767A
Authority
JP
Japan
Prior art keywords
synchronization signal
horizontal
flip
flop
synchronizing 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
JP29161290A
Other languages
Japanese (ja)
Inventor
Yoshimasa Yanai
柳井 義雅
Osamu Okada
修 岡田
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.)
NEC Corp
NEC IC Microcomputer Systems Co Ltd
Original Assignee
NEC Corp
NEC IC Microcomputer Systems 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 NEC Corp, NEC IC Microcomputer Systems Co Ltd filed Critical NEC Corp
Priority to JP29161290A priority Critical patent/JPH04165767A/en
Publication of JPH04165767A publication Critical patent/JPH04165767A/en
Pending legal-status Critical Current

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  • Synchronizing For Television (AREA)

Abstract

PURPOSE:To reduce the scale of the system of video equipment while enabling the fetch in an integrated circuit by digitally taking in a horizontal synchronizing signal component and vertical synchronizing signal component from a video composite synchronization signal. CONSTITUTION:A NAND 3 takes the NAND between the output of a D-flip-flop 2 and the output of a NAND 1, and sets a horizontal counter 4 while outputting the horizontal synchronizing signal. Since the twice of horizontal synchronizing frequency component is removed, a mask signal is made of an RS flip-flop composed of NANDs 6 and 7 and inputted to the NAND 1 to be masked. Then, a vertical synchronization signal decision timing data is outputted to an OR 9 from a horizontal counter 4 by a horizontal decoder 5, and the moment of HSAW period is taken out as the vertical synchronizing signal by means of a D-flip-flop 11 and a NOR8 when the video composite synchronizing signal is read by a D-flip--flop 10. In short, it can be constructed by a digital circuit. Thus, the fetch in the integrated circuit can be performed and the system of the video equipment can be miniaturized.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、TV、ビデオなどの映像機器用複合同期信号
分離回路に関し、特にtIk積回路内で映像用複合同期
信号からデジタル的に水平同期信号成分、垂直同期信号
成分を取り出す回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite synchronization signal separation circuit for video equipment such as TVs and videos, and in particular to digitally horizontal synchronization from a video composite synchronization signal within a tIk product circuit. The present invention relates to a circuit for extracting signal components and vertical synchronization signal components.

〔従来の技術〕[Conventional technology]

従来、この種の映像用複合同期信号分離回路は、第4図
のブロック図に示すアナログ回路で構成され、ANDゲ
ート14のマスク回路と、マルチバイブレータ15と、
微分・積分回路とから構成される。このマルチバイブレ
ータ15を用いて水平同期周波数の2倍の成分を取り除
き、コンデンサC1,抵抗R1の微分回路により水平同
期信号22を取り出し、抵抗R2,コンデンサC2の積
分回路を用いて垂直同期信号23を取り出している。
Conventionally, this type of video composite synchronization signal separation circuit is composed of analog circuits shown in the block diagram of FIG. 4, including a mask circuit of an AND gate 14, a multivibrator 15,
Consists of differential and integral circuits. This multivibrator 15 is used to remove the component twice the horizontal synchronization frequency, the horizontal synchronization signal 22 is extracted using a differentiating circuit of capacitor C1 and resistor R1, and the vertical synchronization signal 23 is extracted using an integrating circuit of resistor R2 and capacitor C2. I'm taking it out.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の回路は、アナログ回路で構成されている
ので、集積回路内にいれることが困難であるという欠点
がある。
The above-mentioned conventional circuit has the disadvantage that it is difficult to incorporate it into an integrated circuit because it is constructed of an analog circuit.

本発明の目的は、デジタル回路で構成することにより、
集積回路内に取り込むことができると共に、映像機器の
システムの規模を小さくすることができるようにした映
像用複合同期信号分離回路を提供することにある。
The purpose of the present invention is to
An object of the present invention is to provide a video composite synchronization signal separation circuit that can be incorporated into an integrated circuit and can reduce the scale of a video equipment system.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の映像用複合同期信号分離回路は、フリップフロ
ップと論理ゲートとにより構成され映像用複合同期信号
の各同期信号の前縁を検出する位置検出回路と、この位
置検出回路へ入力される前記複合同期信号の水平同期周
波数の2倍の成分をマスクしフリップフロップと論理ゲ
ートとにより構成されたマスク回路と、前記位置検出回
路の出力に同期してカウントする水平カウンタと、この
水平カウンタの出力をテコードするデコーダと、このデ
コーダの出力信号と前記複合同期信号とを入力しフリッ
プフロ・ツブと論理ゲートとにより構成され前記複合同
期信号の垂直同期信号期間を検出する垂直同期検出回路
とを有することを特徴とする。
The video composite synchronization signal separation circuit of the present invention includes a position detection circuit that is configured of a flip-flop and a logic gate and detects the leading edge of each synchronization signal of the video composite synchronization signal, and a position detection circuit that detects the leading edge of each synchronization signal of the video composite synchronization signal. A mask circuit configured of flip-flops and logic gates that masks a component twice the horizontal synchronization frequency of the composite synchronization signal, a horizontal counter that counts in synchronization with the output of the position detection circuit, and an output of the horizontal counter. and a vertical synchronization detection circuit that receives the output signal of the decoder and the composite synchronization signal, and is constituted by a flip-flop tube and a logic gate and detects the vertical synchronization signal period of the composite synchronization signal. It is characterized by

本発明において、水平カウンタの代りにタイマーを用い
ることもできる。
In the present invention, a timer can also be used instead of a horizontal counter.

〔実施例〕〔Example〕

次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第1図は本発明の一実施例の構成図を示すブロック図で
ある。本実施例は、NANDゲート1゜3.6.7と、
D−7!Jツ77Dツ72+ 10゜11と、水平カウ
ンタ4と、水平デコーダ5と、NORゲート8と、OR
ゲート9と、垂直カウンタ12とから構成される。
FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. This embodiment uses a NAND gate 1°3.6.7,
D-7! J 77 D 72 + 10° 11, horizontal counter 4, horizontal decoder 5, NOR gate 8, OR
It consists of a gate 9 and a vertical counter 12.

第2図、第3図は第1図の水平および垂直タイミングの
波形図である。図に示す映像用複合同期信号C3YNが
、N A N D’lに入力されD−フリップフロップ
2のデータに入力される。これを水平同期周期より充分
短い周期のクロック(通常水平同期周波数の整数倍、例
えば202fH)で取り込むこみ遅延反転しNAND3
に出力する。このNAND3か、D−フリップフロップ
2の出力とNAND 1の出力とのNANDをとり、第
2図に示す水平同期信号を出力して水平カウンタ4をセ
ットし、水平同期をとる。
2 and 3 are waveform diagrams of the horizontal and vertical timings of FIG. 1. The video composite synchronization signal C3YN shown in the figure is input to N A N D'l and input to the data of the D-flip-flop 2. This is captured by a clock with a cycle sufficiently shorter than the horizontal synchronization cycle (usually an integer multiple of the horizontal synchronization frequency, for example 202fH), delayed and inverted, and NAND3
Output to. This NAND3 or the output of the D-flip-flop 2 is NANDed with the output of the NAND1, and the horizontal synchronization signal shown in FIG. 2 is outputted to set the horizontal counter 4 and achieve horizontal synchronization.

また、第3図に示す映像用複合同期信号の水平同期周波
数の2倍の成分を取り除くため、第2図に示す前縁はN
AND3の出力て決定され、後縁は水平デコーダ5の出
力で決定されるマスク信号をNAND6,7で構成され
るRSフリップフロ゛ツブで作り出し、NANDIに入
力しマスクする。
In addition, in order to remove the component twice the horizontal synchronization frequency of the video composite synchronization signal shown in FIG. 3, the leading edge shown in FIG.
A mask signal whose trailing edge is determined by the output of AND3, and whose trailing edge is determined by the output of horizontal decoder 5, is generated by an RS flip-flop composed of NANDs 6 and 7, and input to NANDI for masking.

次に、同期のとれた水平カウンタ4から水平デコーダ5
で垂直同期信号判定タイミングデータをOR9に出力し
、このOR9から第2図のデータ取り込みタイミングを
出力し、D−フリップフロップ10にて映像用複合同期
信号を読み込む。このとき、第3図に示すように、H8
AW部分だけがロウになっているので、このH8AW期
間になった瞬間をD−フリップフロップ11とN0R8
とにより垂直同期信号として取り出し、垂直カウンタ1
2をセットし、これによって垂直タイミングの同期をと
ることかてき、アナログ回路と同様の効果を得ることが
できる。
Next, from the synchronized horizontal counter 4 to the horizontal decoder 5
The vertical synchronization signal determination timing data is outputted to the OR 9, the data acquisition timing shown in FIG. At this time, as shown in Figure 3, H8
Since only the AW part is low, the moment when this H8AW period starts, D-flip-flop 11 and N0R8
Then, it is extracted as a vertical synchronization signal and sent to vertical counter 1.
2, thereby synchronizing the vertical timing and achieving the same effect as an analog circuit.

本実施例では、マスク信号を作り出すために、カウンタ
4を用いたが、このカウンタ4の代りにタイマを用いる
こともできる。この場合にはデコーダ5の構成を簡略化
して同様の効果を得ることができる。
In this embodiment, the counter 4 is used to generate the mask signal, but a timer may be used instead of the counter 4. In this case, the configuration of the decoder 5 can be simplified and similar effects can be obtained.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、デジタル回路で構成する
ことができるため、集積回路内に取込むことができると
共に、この集積回路により映像機器のシステムを小形に
することができるという効果がある。
As explained above, since the present invention can be configured with a digital circuit, it can be incorporated into an integrated circuit, and this integrated circuit has the advantage that the system of video equipment can be made smaller.

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

第1図は本発明の一実施例の水平同期信号垂直同期信号
分離回路のフロック図、第2図、第3図は第1図の複合
同期信号の水平および垂直タイミング図、第4図は従来
の水平同期信号垂直同期信号分離回路の一例のブロック
図である。 1,3,6.7・・・NANDゲート、2,10゜11
・・・D型フリップフロップ、4・・・水平カウンタ、
5・・・水平デコーダ、8・・・NORケート、9・・
・ORケート、12・・垂直カウンタ、14・・・AN
Dゲート、15・・・マルチバイブレータ。
FIG. 1 is a block diagram of a horizontal synchronization signal/vertical synchronization signal separation circuit according to an embodiment of the present invention, FIGS. 2 and 3 are horizontal and vertical timing diagrams of the composite synchronization signal of FIG. 1, and FIG. 4 is a conventional FIG. 2 is a block diagram of an example of a horizontal synchronization signal/vertical synchronization signal separation circuit of FIG. 1, 3, 6.7...NAND gate, 2, 10° 11
...D type flip-flop, 4...horizontal counter,
5...Horizontal decoder, 8...NOR gate, 9...
・OR Kate, 12...Vertical counter, 14...AN
D gate, 15...Multi-vibrator.

Claims (1)

【特許請求の範囲】 1、フリップフロップと論理ゲートとにより構成され映
像用複合同期信号の各同期信号の前縁を検出する位置検
出回路と、この位置検出回路へ入力される前記複合同期
信号の水平同期周波数の2倍の成分をマスクしフリップ
フロップと論理ゲートとにより構成されたマスク回路と
、前記位置検出回路の出力に同期してカウントする水平
カウンタと、この水平カウンタの出力をデコードするデ
コーダと、このデコーダの出力信号と前記複合同期信号
とを入力しフリップフロップと論理ゲートとにより構成
され前記複合同期信号の垂直同期信号期間を検出する垂
直同期検出回路とを有することを特徴とする映像用複合
同期信号分離回路。 2、水平カウンタに代えてタイマーを用いた請求項(1
)記載の映像用複合同期信号分離回路。
[Claims] 1. A position detection circuit configured with a flip-flop and a logic gate and detecting the leading edge of each synchronization signal of a video composite synchronization signal, and a position detection circuit for detecting the leading edge of each synchronization signal of a video composite synchronization signal, and A mask circuit configured of flip-flops and logic gates that masks a component twice the horizontal synchronization frequency, a horizontal counter that counts in synchronization with the output of the position detection circuit, and a decoder that decodes the output of the horizontal counter. and a vertical synchronization detection circuit which receives the output signal of the decoder and the composite synchronization signal, is configured by a flip-flop and a logic gate, and detects a vertical synchronization signal period of the composite synchronization signal. Composite synchronous signal separation circuit for use. 2. Claim (1) in which a timer is used in place of the horizontal counter
) video composite synchronization signal separation circuit.
JP29161290A 1990-10-29 1990-10-29 Video composite synchronizing signal separation circuit Pending JPH04165767A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29161290A JPH04165767A (en) 1990-10-29 1990-10-29 Video composite synchronizing signal separation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29161290A JPH04165767A (en) 1990-10-29 1990-10-29 Video composite synchronizing signal separation circuit

Publications (1)

Publication Number Publication Date
JPH04165767A true JPH04165767A (en) 1992-06-11

Family

ID=17771206

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29161290A Pending JPH04165767A (en) 1990-10-29 1990-10-29 Video composite synchronizing signal separation circuit

Country Status (1)

Country Link
JP (1) JPH04165767A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1093881A (en) * 1996-09-19 1998-04-10 Toshiba Corp Noise removal circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1093881A (en) * 1996-09-19 1998-04-10 Toshiba Corp Noise removal circuit

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