JPH11155085A - Device for adjusting image quality - Google Patents

Device for adjusting image quality

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Publication number
JPH11155085A
JPH11155085A JP9336509A JP33650997A JPH11155085A JP H11155085 A JPH11155085 A JP H11155085A JP 9336509 A JP9336509 A JP 9336509A JP 33650997 A JP33650997 A JP 33650997A JP H11155085 A JPH11155085 A JP H11155085A
Authority
JP
Japan
Prior art keywords
circuit
image quality
frequency
scanning line
horizontal
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
JP9336509A
Other languages
Japanese (ja)
Inventor
Takashi Hiraga
孝 平賀
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
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP9336509A priority Critical patent/JPH11155085A/en
Publication of JPH11155085A publication Critical patent/JPH11155085A/en
Pending legal-status Critical Current

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  • Picture Signal Circuits (AREA)

Abstract

PROBLEM TO BE SOLVED: To detect the frequency bands of various video signals with precision, to respectively and properly adjust an image and to automatically improve image quality by controlling an image quality control circuit through the use of an output which is obtained by means of detected scanning line data and horizontal frequency data. SOLUTION: The frequency bands of the video signals are in proportion to the product of a scanning line number and the horizontal frequency at the time of an equal vertical resolution. The frequency bands of the video signals are discriminated by using it. A scanning line counter 21 constituting a scanning line number detecting circuit 2 counts the scanning line number based on a vertical synchronizing signal and a horizontal synchronizing signal and converts it into a voltage corresponding to the scanning line by a scanning line number/ voltage converter 22. The horizontal synchronizing signal is converted into the voltage corresponding to the frequency by a frequency/voltage converter 23. The both output voltages are multiplied by a multiplication/control circuit 4 so as to be compared with a previously fixed reference value by a comparator 42 and a switch 12 or 13 is controlled in accordance with a comparison result so that a desired emitter peaking circuit 14 or 15 is operated.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、画質調整装置に関
し、特に解像度に応じた映像信号の周波数特性を調整す
る画質調整装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image quality adjusting device, and more particularly to an image quality adjusting device for adjusting a frequency characteristic of a video signal according to a resolution.

【０００２】[0002]

【従来の技術】現在、ディスプレイに表示する映像信号
としては標準テレビジョン信号やハイビジョン信号、各
種コンピュータ信号など、様々な水平・垂直同期信号や
解像度の映像信号があり、それぞれに適した高画質な画
像表示が望まれている。2. Description of the Related Art At present, various video signals of various horizontal and vertical synchronizing signals and resolutions, such as standard television signals, high-definition signals, various computer signals, etc., are displayed on a display. Image display is desired.

【０００３】通常、ディスプレイ装置における映像出力
回路の周波数特性は、入力映像信号の周波数特性と同等
か、もしくはそれ以上の特性が必要であるために種々の
周波数特性の改善が採られている。例えば、高精細ディ
スプレイ装置における映像回路の周波数特性の低下を補
償するためには、例えば、ピーキング等の周波数特性改
善手段が用いられる。また、画面上の鮮鋭度を向上させ
るために、映像信号の高域成分の周波数帯域を強調させ
る手段も用いられる。特に、陰極線管を用いたディスプ
レイ装置においては、陰極線管に流れる電子ビームが有
限な大きさを持つため、画面上における高域成分が低下
し、高域成分を補償する画質調整装置を設けて画面上の
鮮鋭度を向上させている。Usually, the frequency characteristics of a video output circuit in a display device need to be equal to or higher than the frequency characteristics of an input video signal, so that various frequency characteristics have been improved. For example, in order to compensate for a decrease in the frequency characteristic of the video circuit in the high definition display device, for example, a frequency characteristic improving means such as peaking is used. In order to improve the sharpness on the screen, a means for enhancing the frequency band of the high frequency component of the video signal is also used. In particular, in a display device using a cathode ray tube, since the electron beam flowing through the cathode ray tube has a finite size, a high-frequency component on the screen is reduced, and an image quality adjusting device for compensating for the high-frequency component is provided. The sharpness is improved.

【０００４】従来の画質調整装置の一例として、図３に
は周波数特性補償回路が示されている。図３において、
エミッタ接地増幅回路１００のエミッタ抵抗ＲEに、抵
抗Ｒ１とコンデンサＣ１の直列回路から成るピーキング
回路１１０を並列に接続することにより、高域での電圧
利得を上がて映像信号の周波数特性を補償している。映
像信号は、コレクタ側の出力端子から出力される。FIG. 3 shows a frequency characteristic compensating circuit as an example of a conventional image quality adjusting device. In FIG.
By connecting a peaking circuit 110 composed of a series circuit of a resistor R1 and a capacitor C1 in parallel to the emitter resistor RE of the common-emitter amplifier circuit 100, the voltage gain in a high frequency range is increased and the frequency characteristic of the video signal is compensated. ing. The video signal is output from an output terminal on the collector side.

【０００５】図３に示す周波数特性補償回路によれば、
比較的高周波まで特性が伸ばせる反面、位相特性に悪影
響を与えてしまう。この影響を解消するために提案され
ているのが図４に示すような画質調整装置である。According to the frequency characteristic compensation circuit shown in FIG.
While the characteristics can be extended to relatively high frequencies, the phase characteristics are adversely affected. An image quality adjusting device as shown in FIG. 4 has been proposed to eliminate this effect.

【０００６】図４に示す画質調整装置を、図４の動作を
説明するための各部の波形図示す図５をも参照して説明
する。The image quality adjusting device shown in FIG. 4 will be described with reference to FIG. 5 showing waveform diagrams of respective parts for explaining the operation of FIG.

【０００７】入力端子からの映像信号Ａは、従属接続さ
れている遅延線１０１と１０２で遅延される。入力映像
信号Ａと遅延線１０２の出力信号Ｂは、加算器１０３で
加算され、乗算器１０４にて−１／２が乗算されて信号
Ｄとなる。加算器１０５は、乗算器１０４の出力信号Ｄ
と遅延線１０１の出力信号Ｂを加算する。次に、加算器
１０６は、加算器１０５の出力信号Ｅと遅延線１０１の
出力信号とを加算して、結局、次式で示す出力信号Ｆを
出力端子から映像信号として出力する。 Ｆ＝２Ｂ−Ａ＋Ｃ／２ このような処理により映像信号の輪郭を抽出・強調し、
画面上の鮮鋭度を向上させることができる。The video signal A from the input terminal is delayed by delay lines 101 and 102 which are cascaded. The input video signal A and the output signal B of the delay line 102 are added by an adder 103 and multiplied by -1/2 by a multiplier 104 to become a signal D. The adder 105 outputs the output signal D of the multiplier 104
And the output signal B of the delay line 101 are added. Next, the adder 106 adds the output signal E of the adder 105 and the output signal of the delay line 101, and eventually outputs an output signal F represented by the following equation as a video signal from an output terminal. F = 2B−A + C / 2 By such processing, the outline of the video signal is extracted and emphasized,
The sharpness on the screen can be improved.

【０００８】これら従来の画質調整装置は、映像信号の
特定の周波数帯域の特性を強調することにより画質を改
善させているが、強調する周波数帯域が固定であるため
に、画質を改善できる映像信号の種類が限定され、全て
の入力映像信号に対して最適な画質が得られるわけでは
ない。したがって、映像信号の解像度が異なると、強調
させるべき周波数帯域も異なってしまうことを考慮する
と問題が依然残る。[0008] These conventional picture quality adjusting devices improve the picture quality by enhancing the characteristics of a specific frequency band of the picture signal. However, since the emphasized frequency band is fixed, the picture signal which can improve the picture quality is improved. Are limited, and an optimum image quality cannot be obtained for all input video signals. Therefore, the problem still remains in consideration that the frequency band to be emphasized is different when the resolution of the video signal is different.

【０００９】かかる問題を解決するための画質調整装置
が、特開昭６０−１９２４６７号公報に開示されてい
る。図６には、かかる画質調整装置の構成ブロック図が
示されている。An image quality adjusting device for solving such a problem is disclosed in Japanese Patent Application Laid-Open No. 60-192467. FIG. 6 shows a configuration block diagram of such an image quality adjustment device.

【００１０】図６において、水平同期信号と垂直同期信
号から、走査線数検出回路１３０により映像信号の走査
線数を検出し、得られた走査線数に応じて、画質調整回
路１２０を制御することにより、各種類の映像信号に対
して自動的に画質を調整している。In FIG. 6, the number of scanning lines of a video signal is detected by a scanning line number detecting circuit 130 from a horizontal synchronizing signal and a vertical synchronizing signal, and an image quality adjusting circuit 120 is controlled in accordance with the obtained number of scanning lines. This automatically adjusts the image quality for each type of video signal.

【００１１】[0011]

【発明が解決しようとする課題】上述従来の画質調整装
置は、数種の解像度の信号を入力できるディスプレイを
使用する際、最も解像度の高い入力信号に応じた周波数
特性をもたせるように、ピーキングをセッテイングして
いた。ところが、見た目の映像画質を改善するためにピ
ーキングをかける場合、入力信号の映像周波数帯域に対
して最適な周波数でピーキングをかける必要があり、数
種の解像度の信号それぞれに対して最適な映像画質を得
ることができなかった。When using a display capable of inputting signals of several resolutions, the above-described conventional image quality adjustment device performs peaking so as to have a frequency characteristic corresponding to the input signal having the highest resolution. I was setting. However, when peaking is applied to improve the visual image quality, it is necessary to perform peaking at the optimal frequency for the video frequency band of the input signal. Could not get.

【００１２】上記従来の画質調整装置の問題が生ずるの
は、各種映像信号のうち走査線数が同じで走査周波数が
異なる信号を判別できないからである。すなわち、映像
信号の周波数帯域ｆDOT CLOCKは、 ｆDOT CLOCK＝水平解像度／水平表示期間 となり、アスペクト比を４：３とすると、 ｆDOT CLOCK＝｛（垂直解像度）・４／３｝／（水平表示期間） ＝｛(走査線数)−(垂直ブランキング走査線数)）・４／３｝／ ｛（水平走査期間)−（水平ブランキング期間)｝ ＝｛(走査線数)−(垂直ブランキング走査線数)）・４／３｝／ ｛１／（水平周波数）−（水平ブランキング期間）｝ また、 （走査線数）＝（水平周波数）／（垂直周波数） であるから、走査線数が同じでも垂直周波数が異なれ
ば、水平周波数が異なるために、映像信号の周波数帯域
が変わる。したがって、走査線数だけで映像信号の強調
する周波数帯域を制御していると、適切な画質調整が行
われない。The problem of the above-mentioned conventional image quality adjusting device arises because signals of the same number of scanning lines but different in scanning frequency cannot be discriminated among various video signals. That is, the frequency band fDOT CLOCK of the video signal is fDOT CLOCK = horizontal resolution / horizontal display period. If the aspect ratio is 4: 3, fDOT CLOCK = {(vertical resolution) / 4/3} / (horizontal display period) = {(Number of scanning lines) − (number of vertical blanking scanning lines)) ・ 4/3｝ / ｛(horizontal scanning period) − (horizontal blanking period)｝ = ｛(number of scanning lines) − (vertical blanking scanning) (Number of lines)) / 4/3 / {1 / (horizontal frequency)-(horizontal blanking period)} Also, since (number of scanning lines) = (horizontal frequency) / (vertical frequency), the number of scanning lines is If the vertical frequency differs even if the same, the frequency band of the video signal changes because the horizontal frequency is different. Therefore, if the frequency band in which the video signal is emphasized is controlled only by the number of scanning lines, appropriate image quality adjustment is not performed.

【００１３】そこで、本発明の目的は、各種映像信号の
周波数帯域を精度良く検出し、各々に適切な映像調整を
を施し、画質の改善を自動的に行なう画質調整装置を提
供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an image quality adjusting device which detects the frequency bands of various image signals with high accuracy, performs appropriate image adjustment on each of them, and automatically improves the image quality. .

【００１４】[0014]

【課題を解決するための手段】前述の課題を解決するた
め、本発明による画質調整装置は、次のような特徴的構
成を採用している。In order to solve the above-mentioned problems, an image quality adjusting apparatus according to the present invention employs the following characteristic configuration.

【００１５】（１）映像信号の周波数特性を調整して画
質を調整する画質調整回路と、前記映像信号の走査線数
データと水平線周波数データを検出する検出回路と、検
出された走査線数データと水平周波数データを掛け算す
る掛け算回路と、前記掛け算回路の出力により前記画質
調整回路を制御する制御回路と、を備えて成る画質調整
装置。(1) An image quality adjustment circuit for adjusting the image quality by adjusting the frequency characteristic of the video signal, a detection circuit for detecting the scanning line number data and the horizontal line frequency data of the video signal, and the detected scanning line number data And a multiplication circuit for multiplying the horizontal frequency data, and a control circuit for controlling the image quality adjustment circuit by an output of the multiplication circuit.

【００１６】（２）前記画質調整回路は、少なくとも２
つのピーキング回路を含んで構成される（１）の画質調
整装置。(2) The image quality adjustment circuit includes at least two
The image quality adjustment device of (1), which includes two peaking circuits.

【００１７】（３）前記ピーキング回路は、高域周波数
用と低域周波数用として設けられ、前記掛け算器の出力
が予め定めた周波数よりも高域を示す場合は、前記高域
周波数用ピーキング回路を動作させ、低域を示す場合
は、前記低域周波数用ピーキング回路を動作させる
（１）または（２）の画質調整装置。(3) The peaking circuit is provided for a high frequency band and a low frequency band, and when the output of the multiplier indicates a frequency higher than a predetermined frequency, the peaking circuit for the high frequency band. The image quality adjusting device according to (1) or (2), wherein when the low frequency is indicated, the peaking circuit for low frequency is operated.

【００１８】（４）前記ピーキング回路は、抵抗とコン
デンサの直列回路から成る（１），（２）または（３）
の画質調整装置。(4) The peaking circuit comprises a series circuit of a resistor and a capacitor (1), (2) or (3).
Image quality adjustment device.

【００１９】（５）映像信号の周波数特性を変化させる
画質調整回路と、映像信号の走査線数データと水平周波
数データを検出する回路と、前記検出された走査線数デ
ータと水平周波数データを掛け算する掛け算回路と、こ
の掛け算回路の出力により前記画質調整回路を制御する
制御回路とを備えて成る画質調整装置。(5) An image quality adjusting circuit for changing the frequency characteristic of the video signal, a circuit for detecting the scanning line number data and the horizontal frequency data of the video signal, and multiplying the detected scanning line number data and the horizontal frequency data And a control circuit that controls the image quality adjustment circuit based on the output of the multiplication circuit.

【００２０】（６）映像信号の走査線数データと水平周
波数データとに基づいて、前記映像信号の周波数特性を
調整する画質調整装置。(6) An image quality adjusting device for adjusting the frequency characteristic of the video signal based on the scanning line number data and the horizontal frequency data of the video signal.

【００２１】[0021]

【発明の実施の形態】以下、本発明の実施形態について
図面を参照しながら説明する。図１は、本発明の一実施
形態による画質調整装置の構成ブロックである。本実施
形態では、入力映像信号は、後述する画質調整回路１で
画質調整されて映像信号出力が得られる。走査線数検出
回路２は、垂直同期信号と水平同期信号から走査線数を
検出し、水平周波数検出回路３は、水平同期信号から水
平周波数を検出する。掛け算／制御回路４は、走査線数
検出回路２と水平周波数検出回路３で得られた走査線数
と水平周波数を掛け算し、その掛け算出力で画質調整回
路１を制御する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration block diagram of an image quality adjustment device according to an embodiment of the present invention. In the present embodiment, the image quality of the input video signal is adjusted by an image quality adjustment circuit 1 described later, and a video signal output is obtained. The scanning line number detection circuit 2 detects the number of scanning lines from the vertical synchronization signal and the horizontal synchronization signal, and the horizontal frequency detection circuit 3 detects the horizontal frequency from the horizontal synchronization signal. The multiplication / control circuit 4 multiplies the number of scanning lines obtained by the number-of-scanning-lines detection circuit 2 and the horizontal frequency detection circuit 3 by the horizontal frequency, and controls the image quality adjustment circuit 1 with the multiplication calculation power.

【００２２】掛け算／制御回路４により映像信号の周波
数帯域が得られる理由は次のとおりである。図１におい
て、垂直同期信号及び水平同期信号から、走査線数検出
回路２で、映像信号の走査線数を検出し、また水平同期
信号から水平周波数検出回路３で映像信号の水平周波数
を検出する。 ｆDOT CLOCK ＝ （垂直解像度）・４／３／(水平表示期間） この式は次のようにも表わすことができる。 ｆDOT CLOCK ≒ ｛（走査線数）・４／３｝／（水平走査期間） ＝ （走査線数）・（４／３）・（水平周波数）The reason why the frequency band of the video signal can be obtained by the multiplication / control circuit 4 is as follows. In FIG. 1, the number of scanning lines of a video signal is detected by a scanning line number detection circuit 2 from a vertical synchronization signal and a horizontal synchronization signal, and the horizontal frequency of a video signal is detected by a horizontal frequency detection circuit 3 from a horizontal synchronization signal. . fDOT CLOCK = (vertical resolution) / 4/3 / (horizontal display period) This equation can also be expressed as follows. fDOT CLOCK ≒ ｛(number of scanning lines)｝ 4/3｝ / (horizontal scanning period) = (number of scanning lines) ・ (4/3) ・ (horizontal frequency)

【００２３】したがって、映像信号の周波数帯域を判別
する上で、上記２つの式の値は略比例関係にあることか
ら、検出された走査線数と水平周波数を、掛け算／制御
回路４で掛け算すれば、映像信号の周波数帯域を判別す
ることができ、得られた映像信号の周波数帯域に基づい
て画質調整回路１を制御することができる。Therefore, in determining the frequency band of the video signal, the values of the above two equations are substantially proportional to each other, so that the multiplication / control circuit 4 multiplies the detected number of scanning lines and the horizontal frequency. For example, the frequency band of the video signal can be determined, and the image quality adjustment circuit 1 can be controlled based on the obtained frequency band of the video signal.

【００２４】図２には、図１に示す画質調整装置の具体
的回路構成が示されている。入力映像信号は、エミッタ
接地増幅回路１１で増幅されて、映像信号出力として出
力される。エミッタ接地増幅回路１１のエミッタ端子に
は、スイッチ１２と１３を介して、それぞれ、抵抗Ｒ１
とコンデンサＣ１の直列回路及び抵抗Ｒ２とコンデンサ
Ｃ２の直列回路から成るピーキング回路１４及び１５が
接続されている。FIG. 2 shows a specific circuit configuration of the image quality adjusting device shown in FIG. The input video signal is amplified by the common emitter amplifier circuit 11 and output as a video signal output. A resistor R1 is connected to the emitter terminal of the common-emitter amplifier circuit 11 via switches 12 and 13, respectively.
And a series circuit of a capacitor C1 and a peaking circuit 14 and 15 composed of a series circuit of a resistor R2 and a capacitor C2.

【００２５】一方、垂直同期信号及び水平同期信号に基
づいて走査線数検出回路２を構成する走査線数カウンタ
２１は、走査線数をカウントし、カウントした走査線数
は、走査線数／電圧変換器２２で走査線数に対応する電
圧に変換される。また、水平同期信号は、周波数／電圧
変換器２３に入力され、周波数に対応する電圧に変換さ
れる。On the other hand, the scanning line number counter 21 constituting the scanning line number detecting circuit 2 based on the vertical synchronizing signal and the horizontal synchronizing signal counts the number of scanning lines, and the counted number of scanning lines is the number of scanning lines / voltage. The converter 22 converts the voltage into a voltage corresponding to the number of scanning lines. The horizontal synchronizing signal is input to the frequency / voltage converter 23 and is converted into a voltage corresponding to the frequency.

【００２６】掛け算／制御回路４を構成する掛け算器４
１は、走査線数／電圧変換器２２と周波数／電圧変換器
２３からの出力を掛け算し、すなわち、走査線数と水平
同期信号の周波数に対応する電圧を掛け算してコンパレ
ータ４２に出力する。Multiplier 4 constituting multiplier / control circuit 4
1 multiplies the output from the number of scanning lines / voltage converter 22 and the output from the frequency / voltage converter 23, that is, multiplies the number of scanning lines by the voltage corresponding to the frequency of the horizontal synchronization signal and outputs the result to the comparator 42.

【００２７】コンパレータ４２は、掛け算器４１からの
出力を、予め定めた基準値と比較して、比較結果に応じ
てスイッチ１２または１３をＯＮ／ＯＦＦ制御して所望
のピーキング回路１４または１５を動作させる。The comparator 42 compares the output from the multiplier 41 with a predetermined reference value, and controls ON / OFF of the switch 12 or 13 according to the comparison result to operate the desired peaking circuit 14 or 15. Let it.

【００２８】より具体的に動作を説明すると、映像信号
が入力されるエミッタ接地増幅回路１１のエミッタ端子
に、スイッチ１２と１３を介して各々接続されたピーキ
ング回路１４と１５には、強調する各周波数帯域の値か
ら、例えば、ピーキング回路１４は低域の定数を、ピー
キング回路１５は高域の定数を予め選定しておく。The operation will be described more specifically. Peaking circuits 14 and 15 connected via switches 12 and 13 to the emitter terminal of a grounded-emitter amplifier circuit 11 to which a video signal is input are respectively emphasized. For example, the peaking circuit 14 selects a low-band constant and the peaking circuit 15 selects a high-band constant from the frequency band value.

【００２９】走査線カウンタ２１は、垂直同期信号をト
リガにして、垂直期間内の水平同期信号の回数をカウン
トし、この値を走査線数／電圧変換器２２で映像信号の
走査線数として、電圧値に変換する。また、周波数／電
圧変換器２３は、水平同期信号を周波数／電圧（Ｆ／
Ｖ）し、水平周波数として電圧値にする。これら走査線
数の電圧値と水平周波数の電圧値を、掛け算器４１で掛
け算し、映像信号の周波数帯域を電圧値として検出し、
この値をコンパレータ４２で比較し、入力された映像信
号の周波数帯域が低いと判断すれば、スイッチ１２をＯ
Ｎし、スイッチ１３をＯＦＦする。また、逆に周波数帯
域が高いと判断すれれば、スイッチ１３をＯＮし、スイ
ッチ１２をＯＦＦする。The scanning line counter 21 counts the number of horizontal synchronizing signals in the vertical period by using the vertical synchronizing signal as a trigger, and uses this value as the number of scanning lines / voltage converter 22 as the number of scanning lines of the video signal. Convert to voltage value. The frequency / voltage converter 23 converts the horizontal synchronizing signal into a frequency / voltage (F /
V) to obtain a voltage value as the horizontal frequency. The voltage value of the number of scanning lines and the voltage value of the horizontal frequency are multiplied by a multiplier 41 to detect the frequency band of the video signal as a voltage value,
This value is compared by the comparator 42, and if it is determined that the frequency band of the input video signal is low, the switch 12 is turned off.
N, and the switch 13 is turned off. Conversely, if it is determined that the frequency band is high, the switch 13 is turned on and the switch 12 is turned off.

【００３０】尚、判別する入力映像信号の周波数帯域の
種類を増やす場合は、エミッタ接地増幅回路１１のエミ
ッタ端子に、スイッチ１２と１３を介して各々接続され
たピーキング回路１４と１５と同等の回路を、それぞれ
並列に追加接続すればよい。When the type of frequency band of the input video signal to be discriminated is increased, a circuit equivalent to the peaking circuits 14 and 15 connected to the emitter terminal of the common-emitter amplifier circuit 11 via the switches 12 and 13 respectively. May be additionally connected in parallel.

【００３１】上述実施形態の説明において、図２の画質
調整回路１としては、図４に示すような画質調整回路を
用いることも可能であり、この場合、図２のコンパレー
タ４２は、図４の遅延線１０１と１０２の遅延量を制御
することにより、映像信号の強調する周波数帯域を制御
する。In the description of the above embodiment, it is possible to use an image quality adjustment circuit as shown in FIG. 4 as the image quality adjustment circuit 1 of FIG. 2. In this case, the comparator 42 of FIG. By controlling the delay amount of the delay lines 101 and 102, the frequency band in which the video signal is emphasized is controlled.

【００３２】[0032]

【発明の効果】以上説明したように、本発明による画質
調整装置は、映像信号の周波数帯域を判別する際に、映
像信号の走査線数だけでなく、水平周波数も判断材料と
するので、走査線数が同じで垂直周波数が異なる信号も
判別できる。したがって、各種映像信号の周波数帯域を
精度良く検出し、適切な画質調整を自動的に行うことが
できるという顕著な効果が得られる。As described above, the image quality adjusting apparatus according to the present invention uses not only the number of scanning lines of the video signal but also the horizontal frequency as a judgment material when determining the frequency band of the video signal. Signals having the same number of lines but different vertical frequencies can also be determined. Therefore, a remarkable effect is obtained in that the frequency bands of various video signals can be accurately detected and appropriate image quality adjustment can be automatically performed.

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

【図１】本発明の画質調整装置の一実施形態を示す構成
ブロック図である。FIG. 1 is a configuration block diagram showing an embodiment of an image quality adjustment device of the present invention.

【図２】図１に示す画質調整装置の具体的構成ブロック
図である。FIG. 2 is a specific configuration block diagram of the image quality adjustment device shown in FIG.

【図３】従来の画質調整装置の一例としてのエミッタピ
ーキング回路図である。FIG. 3 is an emitter peaking circuit diagram as an example of a conventional image quality adjusting device.

【図４】従来の画質調整装置の別の例を示す輪郭補正回
路である。FIG. 4 is a contour correction circuit showing another example of a conventional image quality adjustment device.

【図５】図４の従来の画質調整装置の各部における動作
を示す波形図である。5 is a waveform chart showing an operation of each section of the conventional image quality adjusting device of FIG.

【図６】従来の他例を示す画質調整装置の構成ブロック
図である。FIG. 6 is a block diagram illustrating a configuration of an image quality adjustment device according to another example of the related art.

【符号の説明】[Explanation of symbols]

１ 画質調整回路 ２ 走査線数検出回路 ３ 水平周波数検出回路 ４ 掛算／制御回路 １１、１００ エミッタ接地増幅回路 １２、１３ 強調周波数帯域切り替えスイッチ １４、１５、１１０ エミッタピーキング回路 ２１ 走査線数カウンタ ２２ 走査線数／電圧変換器 ２３ 周波数／電圧変換器 ４１ 掛算器 ４２ コンパレータ １０１、１０２ 遅延線 １０３、１０５、１０６ 加算器 １０４ 乗算器 DESCRIPTION OF SYMBOLS 1 Image-quality adjustment circuit 2 Number of scanning lines detection circuit 3 Horizontal frequency detection circuit 4 Multiplication / control circuit 11, 100 Common emitter amplifier circuit 12, 13 Emphasis frequency band changeover switch 14, 15, 110 Emitter peaking circuit 21 Scanning line number counter 22 Scanning Number of lines / voltage converter 23 Frequency / voltage converter 41 Multiplier 42 Comparator 101, 102 Delay line 103, 105, 106 Adder 104 Multiplier

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】映像信号の周波数特性を調整して画質を調
整する画質調整回路と、 前記映像信号の走査線数データと水平線周波数データを
検出する検出回路と、 検出された走査線数データと水平周波数データを掛け算
する掛け算回路と、 前記掛け算回路の出力により前記画質調整回路を制御す
る制御回路と、を備えて成ることを特徴とする画質調整
装置。An image quality adjustment circuit that adjusts image quality by adjusting frequency characteristics of a video signal; a detection circuit that detects scanning line number data and horizontal line frequency data of the video signal; An image quality adjustment device, comprising: a multiplication circuit that multiplies horizontal frequency data; and a control circuit that controls the image quality adjustment circuit based on an output of the multiplication circuit. 【請求項２】前記画質調整回路は、少なくとも２つのピ
ーキング回路を含んで構成される請求項１に記載の画質
調整装置。2. The image quality adjusting device according to claim 1, wherein said image quality adjusting circuit includes at least two peaking circuits. 【請求項３】前記ピーキング回路は、高域周波数用と低
域周波数用として設けられ、前記掛け算器の出力が予め
定めた周波数よりも高域を示す場合は、前記高域周波数
用ピーキング回路を動作させ、低域を示す場合は、前記
低域周波数用ピーキング回路を動作させる請求項１また
は２に記載の画質調整装置。3. The peaking circuit according to claim 1, wherein the peaking circuit is provided for a high frequency band and a low frequency band, and when the output of the multiplier indicates a frequency higher than a predetermined frequency, the peaking circuit for the high frequency band is provided. 3. The image quality adjustment device according to claim 1, wherein the low frequency band peaking circuit is operated when the low frequency band is indicated. 【請求項４】前記ピーキング回路は、抵抗とコンデンサ
の直列回路から成る請求項１，２または３に記載の画質
調整装置。4. The apparatus according to claim 1, wherein said peaking circuit comprises a series circuit of a resistor and a capacitor. 【請求項５】映像信号の周波数特性を変化させる画質調
整回路と、映像信号の走査線数データと水平周波数デー
タを検出する回路と、前記検出された走査線数データと
水平周波数データを掛け算する掛け算回路と、この掛け
算回路の出力により前記画質調整回路を制御する制御回
路とを備えて成ることを特徴とする画質調整装置。5. An image quality adjusting circuit for changing a frequency characteristic of a video signal, a circuit for detecting scanning line number data and horizontal frequency data of the video signal, and multiplying the detected scanning line number data and horizontal frequency data. An image quality adjustment device comprising: a multiplication circuit; and a control circuit that controls the image quality adjustment circuit based on an output of the multiplication circuit. 【請求項６】映像信号の走査線数データと水平周波数デ
ータとに基づいて、前記映像信号の周波数特性を調整す
ることを特徴とする画質調整装置。6. An image quality adjusting apparatus for adjusting a frequency characteristic of a video signal based on data on the number of scanning lines and horizontal frequency data of the video signal.
JP9336509A 1997-11-20 1997-11-20 Device for adjusting image quality Pending JPH11155085A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9336509A JPH11155085A (en) 1997-11-20 1997-11-20 Device for adjusting image quality

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9336509A JPH11155085A (en) 1997-11-20 1997-11-20 Device for adjusting image quality

Publications (1)

Publication Number Publication Date
JPH11155085A true JPH11155085A (en) 1999-06-08

Family

ID=18299874

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9336509A Pending JPH11155085A (en) 1997-11-20 1997-11-20 Device for adjusting image quality

Country Status (1)

Country Link
JP (1) JPH11155085A (en)

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