JPH04243380A - Horizontal enhancement circuit - Google Patents

Horizontal enhancement circuit

Info

Publication number
JPH04243380A
JPH04243380A JP3003709A JP370991A JPH04243380A JP H04243380 A JPH04243380 A JP H04243380A JP 3003709 A JP3003709 A JP 3003709A JP 370991 A JP370991 A JP 370991A JP H04243380 A JPH04243380 A JP H04243380A
Authority
JP
Japan
Prior art keywords
high frequency
video
frequency component
enhancement circuit
circuit
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
JP3003709A
Other languages
Japanese (ja)
Inventor
Toshio Kanazawa
金澤 敏雄
Toshikatsu Kawakami
川上 俊勝
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 JP3003709A priority Critical patent/JPH04243380A/en
Publication of JPH04243380A publication Critical patent/JPH04243380A/en
Pending legal-status Critical Current

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  • Picture Signal Circuits (AREA)

Abstract

PURPOSE:To always obtain a video image with high picture quality by selecting automatically the intensity in response to the video image software in the case of emphasizing a detailed part of the video signal. CONSTITUTION:A band pass filter 4 extracts a high frequency component from a video luminance signal and a DC voltage in response to the high frequency component is outputted from a bias conversion circuit 5, the DC voltage is compared with plural reference voltages at a comparator 6 to divide its output into several step voltages. A switch circuit is selected depending on the several steps of voltages VL, VM, VH to select any resistor in response to the high frequency component thereby always optimizing the high frequency emphasis effect.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、映像モニターによりテ
レビジョン信号や高品位テレビジョン信号を映出する際
、用いられている水平エンハンスメント回路に関するも
のである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal enhancement circuit used when displaying television signals or high-definition television signals on a video monitor.

【0002】0002

【従来の技術】近年、映像受信機は大画面化、高画質化
が急速に普及している。
2. Description of the Related Art In recent years, video receivers with larger screens and higher image quality have rapidly become popular.

【0003】以下に、高画質化のため映像受信機に挿入
されている従来の水平エンハンスメント回路の一例につ
いて説明する。
An example of a conventional horizontal enhancement circuit inserted into a video receiver to improve image quality will be described below.

【0004】第3図は水平エンハンスメント回路の基本
構成を示すものである。第3図において、1はエンハン
スメント回路の強調度合を決める抵抗、2、3は強調帯
域の中心周波数を決めるコイルおよびコンデンサである
。以上のように構成された水平エンハンスメント回路を
、従来は映像ソフトや映像輝度信号の性質によらず定常
的に同じ水平エンハンスメント回路を使用していた。
FIG. 3 shows the basic configuration of a horizontal enhancement circuit. In FIG. 3, 1 is a resistor that determines the degree of emphasis of the enhancement circuit, and 2 and 3 are coils and capacitors that determine the center frequency of the emphasis band. Conventionally, the horizontal enhancement circuit configured as described above is constantly used regardless of the nature of the video software or video luminance signal.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、上記の
ような構成では、定常的に同一特性である水平エンハン
スメント回路を利用しているため、映像ソフトによって
高周波成分が強調されすぎたり、また逆に強調度合が足
りなかったりして、高画質な映像を出力する妨げとなる
という問題点を有していた。
[Problem to be Solved by the Invention] However, in the above configuration, since a horizontal enhancement circuit with the same characteristics is constantly used, the high frequency components may be emphasized too much by the video software, or vice versa. There was a problem in that the intensity was insufficient, which hindered the output of high-quality images.

【0006】本発明は上記問題点に鑑み、映像ソフトや
映像輝度信号の性質によってエンハンスメント回路の強
調度合を自動切替し、常に高画質な映像を出力すること
を目的とする。
SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to automatically switch the degree of emphasis of an enhancement circuit depending on the characteristics of video software and video luminance signals, thereby constantly outputting high-quality video.

【0007】[0007]

【課題を解決するための手段】この目的を達成するため
に本発明のエンハンスメント回路は、高周波成分を取出
すバンドパスフィルター、高周波成分の大きさに応じた
出力電圧を発するバイアス電圧変換器、コンパレータ、
スイッチ回路を有している。
[Means for Solving the Problems] In order to achieve this object, the enhancement circuit of the present invention includes a bandpass filter for extracting high frequency components, a bias voltage converter for generating an output voltage according to the magnitude of the high frequency components, a comparator,
It has a switch circuit.

【0008】[0008]

【作用】この構成によって、映像信号の性質の差異でも
って水平エンハンスメント回路の効果が効きすぎたり、
足りなかったりすることが軽減でき、より高画質化が保
てる。
[Operation] This configuration prevents the horizontal enhancement circuit from becoming too effective due to differences in the characteristics of the video signals.
This can reduce the amount of defects and maintain higher image quality.

【0009】[0009]

【実施例】以下本発明の一実施例について、図面を参照
しながら説明する。図1は本発明の実施例における水平
エンハンスメント回路の基本構成を示すものである。図
1において1a、1b、1cはエンハンスメント回路の
強調度合を決める抵抗で、その値はおのおの異なる。 2、3は強調帯域の中心周波数を決めるコイルおよびコ
ンデンサである。4は、映像輝度信号から高域周波数成
分のみを抜き取るバンドパスフィルター、5はバンドパ
スフィルター4で取り出した高域周波数成分の強度をバ
イアス電圧に変換するバイアス変換回路、6はバイアス
変換回路5が出力するバイアス電圧振幅を複数の基準電
圧と比較し、数種類の段階に分けるコンパレータ、7は
コンパレータ6の出力により、水平エンハンスメント回
路の強調度合を決める抵抗容量を数段(ここでは3段階
)に切替えるスイッチ回路である。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the basic configuration of a horizontal enhancement circuit in an embodiment of the present invention. In FIG. 1, 1a, 1b, and 1c are resistors that determine the degree of emphasis of the enhancement circuit, and their values are different. 2 and 3 are coils and capacitors that determine the center frequency of the emphasis band. 4 is a band pass filter that extracts only high frequency components from the video luminance signal; 5 is a bias conversion circuit that converts the intensity of the high frequency components extracted by the band pass filter 4 into a bias voltage; and 6 is a bias conversion circuit 5. Comparator 7 compares the amplitude of the bias voltage to be output with multiple reference voltages and divides it into several types of stages. 7 uses the output of comparator 6 to switch the resistance capacitance that determines the degree of emphasis of the horizontal enhancement circuit into several stages (three stages in this case). It is a switch circuit.

【0010】つぎに、本回路の動作例について3種類の
抵抗容量をもつ場合について記述する。
Next, an example of the operation of this circuit will be described in the case where it has three types of resistance capacitance.

【0011】もともと映像輝度信号の高周波成分が大き
いものは、バイアス電圧が高くなりコンパレータ出力は
VLに分類され、そしてエンハンスメント回路の効果が
弱くなるよう容量の大きい抵抗1a(R1)がスイッチ
回路7で選択される様にし、そして高周波成分が若干小
さいものは、バイアス電圧が多少小さくなりコンパレー
タ出力がVMに分類され、エンハンスメント回路の効果
が多少強くなるよう中間の容量を持つ抵抗1b(R2)
がスイッチ回路7で選択される。また反対に高周波成分
が小さいものは、バイアス電圧が小さくなりコンパレー
タ出力がVHに分類され、エンハンスメント回路の効果
が強くなるよう容量の小さい抵抗1c(R3)が選択さ
れるように設計する(R1>R2>R3)。
Originally, when the high frequency component of the video luminance signal is large, the bias voltage becomes high and the comparator output is classified as VL, and the resistor 1a (R1) with a large capacitance is used in the switch circuit 7 to weaken the effect of the enhancement circuit. If the high frequency component is a little small, the bias voltage will be a little small, the comparator output will be classified as VM, and the effect of the enhancement circuit will be a little stronger.
is selected by the switch circuit 7. On the other hand, when the high frequency component is small, the bias voltage is small and the comparator output is classified as VH, and the design is such that a resistor 1c (R3) with a small capacitance is selected to strengthen the effect of the enhancement circuit (R1>R2>R3).

【0012】以上のように、本実施例によれば映像ソフ
トによって水平エンハンスメント回路の強調度合が切替
り、いつもより高画質化な映像を出力することができる
As described above, according to this embodiment, the degree of emphasis of the horizontal enhancement circuit is switched by the video software, and it is possible to output a video with higher image quality than usual.

【0013】[0013]

【発明の効果】以上のように本発明は、映像信号に応じ
て水平エンハンスメント回路の強調度合を自動的に切替
えることで、その信号に適した強調を臨機応変に掛ける
ことができ、高画質化の保持が実現できるものである。
[Effects of the Invention] As described above, the present invention automatically switches the emphasis level of the horizontal enhancement circuit according to the video signal, thereby making it possible to flexibly apply emphasis appropriate to the signal, resulting in high image quality. It is possible to maintain the

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

【図1】本発明の一実施例における水平エンハンスメン
ト回路の回路図
FIG. 1 is a circuit diagram of a horizontal enhancement circuit in one embodiment of the present invention.

【図2】従来の水平エンハンスメント回路の回路図[Figure 2] Circuit diagram of a conventional horizontal enhancement circuit

【符号の説明】[Explanation of symbols]

1a  抵抗(R1) 1b  抵抗(R2) 1c  抵抗(R3) 2  コイル 3  コンデンサ 4  バンドパスフィルター 5  バイアス電圧変換回路 6  コンパレータ 7  スイッチ回路 1a Resistance (R1) 1b Resistor (R2) 1c Resistor (R3) 2 Coil 3 Capacitor 4 Bandpass filter 5 Bias voltage conversion circuit 6 Comparator 7 Switch circuit

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】映像輝度信号より高周波成分を取出す手段
と、取出した高周波成分の大きさに応じて、映像の微細
部分の強調度合を自動的に複数段切替える手段を備える
ことを特徴とする水平エンハンスメント回路。
1. A horizontal image display device comprising: means for extracting a high frequency component from a video luminance signal; and means for automatically switching the degree of emphasis of minute parts of the video in multiple steps according to the magnitude of the extracted high frequency component. Enhancement circuit.
【請求項2】映像輝度の高周波成分を検知するのに、バ
ンドパスフィルターを備えた請求項1記載の水平エンハ
ンスメント回路。
2. The horizontal enhancement circuit according to claim 1, further comprising a bandpass filter for detecting high frequency components of image luminance.
【請求項3】検知した高周波成分に応じて、その強調度
合を自動的に切替えるのに、バイアス変換回路とコンパ
レータとスイッチ回路とを備えた請求項1または請求項
2記載の水平エンハンスメント回路。
3. The horizontal enhancement circuit according to claim 1, further comprising a bias conversion circuit, a comparator, and a switch circuit for automatically switching the degree of emphasis according to the detected high frequency component.
JP3003709A 1991-01-17 1991-01-17 Horizontal enhancement circuit Pending JPH04243380A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3003709A JPH04243380A (en) 1991-01-17 1991-01-17 Horizontal enhancement circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3003709A JPH04243380A (en) 1991-01-17 1991-01-17 Horizontal enhancement circuit

Publications (1)

Publication Number Publication Date
JPH04243380A true JPH04243380A (en) 1992-08-31

Family

ID=11564868

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3003709A Pending JPH04243380A (en) 1991-01-17 1991-01-17 Horizontal enhancement circuit

Country Status (1)

Country Link
JP (1) JPH04243380A (en)

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