JPS6057778A - Television signal processing circuit - Google Patents

Television signal processing circuit

Info

Publication number
JPS6057778A
JPS6057778A JP58166406A JP16640683A JPS6057778A JP S6057778 A JPS6057778 A JP S6057778A JP 58166406 A JP58166406 A JP 58166406A JP 16640683 A JP16640683 A JP 16640683A JP S6057778 A JPS6057778 A JP S6057778A
Authority
JP
Japan
Prior art keywords
signal
variable
state
output
pass filter
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
JP58166406A
Other languages
Japanese (ja)
Inventor
Shoji Nishikawa
彰治 西川
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 JP58166406A priority Critical patent/JPS6057778A/en
Publication of JPS6057778A publication Critical patent/JPS6057778A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/64Circuits for processing colour signals
    • H04N9/74Circuits for processing colour signals for obtaining special effects

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Studio Circuits (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To obtain electrically a sharp picture by changing a band variable low pass filter with an output of a variable voltage generating circuit so as to control the frequency characteristic of a luminance signal or the luminance signal and a chrominance signal. CONSTITUTION:A timing signal from a stop/start signal generator 5 changing a state into the state between sharp and unsharp state changes an output voltage of the variable voltage generating circuit 6. An output of the circuit 6 changes the band of variable low pass filters 7, 8 and 9 through which the luminance signal 2 and color difference signals R-Y3 and B-Y4 of the chrominance signal are passed respectively. Then the frequency band of the filters 7, 8 and 9 is changed from the frequency band required for the picture to become in the sharp state to the frequency band required for the picture to become in a the unsharp state in response to the potential of the timing signal.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、テレビジ目ン信号t−電気的に処理するこ
とによって映像全鮮明にしたり不鮮明にすることにより
、映像に特殊効果を与えるテレビジョン信号処理回路に
関するものであり、テレビジョンカメラやビデオテープ
レコーダ等に利用される。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to television signal processing that gives special effects to images by electrically processing the television signal to make the image completely clear or blurry. It relates to circuits and is used in television cameras, video tape recorders, etc.

従来例の構成とその問題点 映像を鮮明にしたりまたは不鮮明にしたりするのは、撮
影の開始のときに不鮮明から鮮明な画像へ、撮影終了の
ときに鮮明から不鮮明な画像にする特殊効果を得るため
に使用されていた。これは、カメラ部に用いられるフェ
ードイン、フェードアウトと同様な効果を得るものであ
る。
Conventional configuration and its problems To make the image clear or blurry, we obtain a special effect that changes the image from blurred to clear at the start of shooting, and from clear to blurred at the end of shooting. was used for. This achieves the same effect as fade-in and fade-out used in the camera section.

この特殊効果を得る方法として、従来は、レンズの焦点
距離を合焦点から離れたところにし、また合焦点にする
方法がとられていた。すなわち、光学系で合焦点と合焦
点でない状態ヲ作り出していた。この方法は、合焦点で
ない状態から合焦点の状部にするのに時間がかかり、連
続的に可変することが困難であるという問題音もってい
る。また、光学系を利用しているため、ビデオチープレ
コータ等の電気信号で記録されたものについては実施で
きないという欠点をもっている。
Conventionally, the method of obtaining this special effect was to set the focal length of the lens away from the focal point and then bring it back to the focal point. In other words, the optical system created a state in which it was in focus and out of focus. This method has problems in that it takes time to change the focus from an unfocused state to a focused state, and it is difficult to change the focus continuously. Furthermore, since it uses an optical system, it has the disadvantage that it cannot be used with electrical signals recorded by a video cheap recorder or the like.

発明の目的 この発明は鮮明な画像と不鮮明な画像と全電気的に作り
出すことができるテレビジョン信号処理回路を提供する
ことを目的とする。
OBJECTS OF THE INVENTION It is an object of the present invention to provide a television signal processing circuit capable of producing clear images and blurred images entirely electrically.

発明の構成 この発明のテレビジョン信号処理回路は、スタートタイ
ミング信号およびスト・ツブタイミング信号に同期して
それぞれ出力電圧を一方向および他方向に徐々に変化さ
せる可変電圧発生回路を設け、この可変電圧発生回路の
出力電圧によって可変低域フィルタの帯域を変えること
によってテレビジョン信号の輝度信号または輝度信号と
クロマ信号との周波数特性を制御するようにしたことを
特徴とする。
Structure of the Invention The television signal processing circuit of the present invention includes a variable voltage generation circuit that gradually changes the output voltage in one direction and the other direction in synchronization with a start timing signal and a stop timing signal, respectively. The present invention is characterized in that the frequency characteristics of the brightness signal or the brightness signal and chroma signal of the television signal are controlled by changing the band of the variable low-pass filter depending on the output voltage of the circuit.

実施例の説明 第1図はこの発明の一実施例のテレビジョン信号処理回
路のブロック図を示している。第1図において、lはテ
レビジョンカメラl((,2,3および4はそれぞれ前
記テレビジョンカメラ部1より得られる輝度信号の出力
端子、クロマ信号の色差信号R−Yの出力端子およびク
ロマ信号の色差信号B−Yの出力端子、5は鮮明から不
鮮明の状部および不鮮明から鮮明の状態へ可変するスト
ップ用およびスタート用のタイミング信号を出力するス
タート・ストップ信号発生器、6は前記タイミング信号
で出力電圧が可変する可変電圧発生器、7.8および9
は前記輝度信号、前記クロマ信号の色差信号R−Y、B
−YThそれぞれ通過させる可変低域フィルタで、可変
電圧発生回路6の出方電圧によって帯域が変化する。1
0は可変低域フィシタフ〜9が入力されて標準カラーテ
レビジョン信号全作るエンコーダテアル。
DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a block diagram of a television signal processing circuit according to an embodiment of the present invention. In FIG. 1, l is a television camera l ((, 2, 3 and 4 are an output terminal for a luminance signal obtained from the television camera section 1, an output terminal for a color difference signal RY of a chroma signal, and an output terminal for a chroma signal 5 is a start/stop signal generator that outputs stop and start timing signals that vary from clear to unclear and from unclear to clear; 6 is the timing signal; Variable voltage generator with variable output voltage, 7.8 and 9
are the luminance signal and the color difference signals RY and B of the chroma signal.
-YTh is a variable low-pass filter that passes each of the signals, and the band changes depending on the output voltage of the variable voltage generation circuit 6. 1
0 is an encoder signal that inputs variable low-pass filters to 9 and produces all standard color television signals.

第1図のスタート・ストップ信号発生器5は、例えばビ
デオテープレコーダの記録開始、終了のとき使用する第
2図[AIKよって示すタイミング信号全発生する。第
2回置に訃いて、11と13は記録開始を、12と14
は記録終了を示すタイミング信号であり、このタイミン
グ信号によって前記可変電圧発生回路6の出力電圧が第
2図fBlに示すように変化する。可変低域フィルタ7
.8.9は、+X2図iBlに示すタイミング信号の電
位によって、画像が鮮明な状態から不鮮明な状郷、すな
わち画像が鮮明になる状■に必要な周波数帯域から画像
が不鮮明な状、態になる周波数帯域の低域フィルタ全構
成している。
The start/stop signal generator 5 shown in FIG. 1 generates all timing signals shown by AIK in FIG. 2, which are used, for example, when starting and ending recording in a video tape recorder. 11 and 13 start recording, 12 and 14
is a timing signal indicating the end of recording, and this timing signal causes the output voltage of the variable voltage generating circuit 6 to change as shown in FIG. 2 fBl. Variable low pass filter 7
.. 8.9, depending on the potential of the timing signal shown in +X2 diagram iBl, the image changes from a clear state to an unclear state, that is, the image changes from the frequency band necessary for the image to become clear. The entire frequency band consists of a low-pass filter.

したがって、可変電圧発生回路6の出力電圧が低い時は
可変低域フィルり7〜9の周波数帯域が狭く、高い時は
可変低域フィルタ7〜9の周波数帯域が十分広くなるよ
うに構成しておけば、タイミング信号11と同時に不鮮
明な画像から徐々に鮮明になって十分解明な所で安定し
、つぎにタイミング信号12と同時に鮮明な画像から徐
々に不鮮明な画像になって十分不鮮明になった所で急に
鮮明な画像になる。実際のビデオテープレコーダの記録
の開始と終了は第2図INに示すタイミング信号より少
し遅れた所で行われるため、記録される部分は、不鮮明
な状態から鮮明な状態全経′C不鮮明な状部で終了する
。したがって、現在テレビカメラに使用されているフェ
ードイン、フェードアウトと同様に画像に特殊効果を与
えることかできる。
Therefore, when the output voltage of the variable voltage generation circuit 6 is low, the frequency band of the variable low-pass filters 7 to 9 is narrow, and when the output voltage is high, the frequency band of the variable low-pass filters 7 to 9 is sufficiently wide. Then, at the same time as timing signal 11, the image went from being unclear to gradually becoming clearer and stabilizing at a sufficiently clear point, and then at the same time as timing signal 12, the image gradually changed from being clear to being unclear until it became sufficiently unclear. Suddenly, the image becomes clearer. Since the actual start and end of recording on a video tape recorder is performed a little later than the timing signal shown in Figure 2 IN, the recorded portion varies from a blurry state to a clear state. Ends with part. Therefore, it is possible to give special effects to images, similar to the fade-in and fade-out currently used in television cameras.

可変低域フィルタ7は、第3図に示す回路によって容易
に実現できる。第3図において、2は輝度信号入力端子
、15は可変電圧発生回路6の出力端子、16は可変低
域フィルタ7の出力端子、17は抵抗(抵抗値R)、1
8はコンデンサ(容量C)、19はFETである。
The variable low-pass filter 7 can be easily realized by the circuit shown in FIG. In FIG. 3, 2 is a luminance signal input terminal, 15 is an output terminal of a variable voltage generation circuit 6, 16 is an output terminal of a variable low-pass filter 7, 17 is a resistor (resistance value R), 1
8 is a capacitor (capacitance C), and 19 is an FET.

FET 19の抵抗値は、ゲート電圧Vに依存するので
、抵抗値’kFR(Vlで表わすと、輝度信号の入出力
伝達関数Tは jωC となr) 、 FR(Vlが無限大のときはT=1 ・
・・(2) で帯域が制限されず、FR関が零のときは1 R+− jωC でRCの時定数をもつ低域フィルタで帯域が制限される
。したがって、FET 19のゲート電圧vを可変する
ことでFR(V+が変化し、第3図の可変低域フィルタ
の周波数帯域全変化させることができる。
The resistance value of the FET 19 depends on the gate voltage V, so the resistance value 'kFR (expressed in Vl, the input/output transfer function T of the luminance signal is jωC), FR (when Vl is infinite, T =1 ・
...(2) When the FR function is zero, the band is not limited by a low-pass filter having an RC time constant of 1 R + - jωC. Therefore, by varying the gate voltage v of the FET 19, FR(V+) changes, and the entire frequency band of the variable low-pass filter shown in FIG. 3 can be changed.

可変低域フィルタ8.9についても同様である。The same applies to the variable low-pass filter 8.9.

このように1苛底した結果、簡単な構成で電気的に鮮明
な画像と不鮮明な画像を得ることができるため、光学的
に同様な効果を得る場合と比べ、ビデオテープレコーダ
等に記録された画像を再生する場合にも使用でき、鮮明
な画像から不鮮明な画像への移行が電気信号で自由に選
択でき、極めて短い時間でも切り換え可能である利点を
もっている。
As a result of these efforts, it is possible to obtain clear and blurred images electrically with a simple configuration, which makes it easier to record images on video tape recorders, etc. compared to obtaining the same effect optically. It can also be used to reproduce images, and has the advantage that the transition from a clear image to an unclear image can be freely selected using electrical signals, and switching can be done even in an extremely short period of time.

なお、上記説明では、ビデオテープレコーダの記録の開
始、終了のタイミングで動作させているが、このタイミ
ングは、任意なものでさしつかえな(、また可変電圧発
生回路6の出力も第2図tBlに示す波形に限定する必
要はない。前記可変低域フィルタ7.8.9はそれぞれ
輝度信号1色差信号R−Y、B−Yを通すためのフィル
タであり、鮮明にするために必要な通過帯域が違うので
、機能は同一であるが特性上具なるものである。また、
色差信号R−Y、B−Yは、輝度信号と比べ周波数帯域
が狭いので、第1図の実施例では、輝度信号と色差信号
R−Y、B−Yとをそれぞれ可変低域フィ〜り?、8.
9に通したが、輝度信号のみ全可変低域フィルタ7に通
してもほぼ同等の効果が得られることは明らかである。
In the above explanation, the operation is performed at the timing of the start and end of recording of the video tape recorder, but this timing can be set arbitrarily (and the output of the variable voltage generating circuit 6 can also be set as shown in FIG. 2 tBl). It is not necessary to limit the waveforms to those shown.The variable low-pass filters 7, 8, and 9 are filters for passing the luminance signal and the color difference signals R-Y, B-Y, respectively, and have the passbands necessary for clarity. The functions are the same, but the characteristics are different.Also,
Since the color difference signals R-Y and B-Y have narrower frequency bands than the luminance signal, in the embodiment shown in FIG. ? , 8.
9, it is clear that almost the same effect can be obtained even if only the luminance signal is passed through the fully variable low-pass filter 7.

発明の効果 この発明のテレビジョン信号処理回路によれば、鮮明な
画像と不鮮明な画像全電気的に作り出すことができ、し
たがって、ビデオテープレコーダ等に記録された画像全
再生する場合にも使用でき、また、画像の移行状態を任
vlC設定できる。
Effects of the Invention According to the television signal processing circuit of the present invention, it is possible to produce clear images and unclear images entirely electrically, and therefore it can also be used for reproducing the entire image recorded on a video tape recorder or the like. In addition, the transition state of the image can be set arbitrarily.

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

第1図はこの発明の一実施例のブロック図、第2図はそ
の各部の波形図、第3図は可変低域フィルタの具体回路
図である。 5・・・スタート・ストップ信号発生器、6・°°可変
電圧発生回路、7〜9・・・可変低域フィルタ第1図
FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a waveform diagram of each part thereof, and FIG. 3 is a specific circuit diagram of a variable low-pass filter. 5...Start/stop signal generator, 6.°° variable voltage generation circuit, 7-9...Variable low-pass filter Figure 1

Claims (2)

【特許請求の範囲】[Claims] (1) スタートタイミング信号およびストップタイミ
ング信号を発生するスタート・スト・リプ信号発生器と
、前記スタートタイミング信号に同期して出力電圧が一
方向に徐々に変化すると・ともに前記ストップタイミン
グ信号に同期して出力電圧が他方向に徐々に変化する可
変電圧発生回路と、この可変゛直圧発生回路の出力電圧
に応じてテレビジョン信号の少くとも輝度信号の周波数
特性を制御する可変低域フィルタとを備えたテレビジョ
ン信号処理回路。
(1) A start strip signal generator that generates a start timing signal and a stop timing signal, and an output voltage that gradually changes in one direction in synchronization with the start timing signal and output in synchronization with the stop timing signal. A variable voltage generating circuit that gradually changes the voltage in the other direction, and a variable low-pass filter that controls the frequency characteristics of at least the brightness signal of the television signal according to the output voltage of the variable direct voltage generating circuit. Television signal processing circuit.
(2) 前記可変低域フィルタはテレビジョン信号のク
ロマ信号の周波数特性も合わせて制御するようにしてい
る特許請求の範囲第(1項記載のテレビジョン信号処理
回路。
(2) The television signal processing circuit according to claim 1, wherein the variable low-pass filter also controls the frequency characteristics of the chroma signal of the television signal.
JP58166406A 1983-09-08 1983-09-08 Television signal processing circuit Pending JPS6057778A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58166406A JPS6057778A (en) 1983-09-08 1983-09-08 Television signal processing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58166406A JPS6057778A (en) 1983-09-08 1983-09-08 Television signal processing circuit

Publications (1)

Publication Number Publication Date
JPS6057778A true JPS6057778A (en) 1985-04-03

Family

ID=15830825

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58166406A Pending JPS6057778A (en) 1983-09-08 1983-09-08 Television signal processing circuit

Country Status (1)

Country Link
JP (1) JPS6057778A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5646372A (en) * 1979-09-25 1981-04-27 Toshiba Corp Picture converter
JPS5765072A (en) * 1980-10-09 1982-04-20 Matsushita Electric Ind Co Ltd Focus mixing device for video signal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5646372A (en) * 1979-09-25 1981-04-27 Toshiba Corp Picture converter
JPS5765072A (en) * 1980-10-09 1982-04-20 Matsushita Electric Ind Co Ltd Focus mixing device for video signal

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