JPS63173975U - - Google Patents
Info
- Publication number
- JPS63173975U JPS63173975U JP6589087U JP6589087U JPS63173975U JP S63173975 U JPS63173975 U JP S63173975U JP 6589087 U JP6589087 U JP 6589087U JP 6589087 U JP6589087 U JP 6589087U JP S63173975 U JPS63173975 U JP S63173975U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- sharpness
- contrast amount
- differentiating
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Picture Signal Circuits (AREA)
Description
第１図は本考案によるシヤープネス回路の一実
施例を示す回路図、第２図ａ〜ｆは第１図に示す
回路の動作を説明するための各部動作波形図、第
３図は従来のシヤープネス回路を使用したテレビ
ジヨン受像機の要部構成図、第４図は第３図に示
すシヤープネス回路の具体例を示す回路図、第５
図ａ〜ｉは第４図に示す回路の動作を説明するた
めの各部動作波形図である。
５……シヤープネス回路、６，２２，２３，３
０……トランジスタ、９，１２，１４，２６，２
７，２９……抵抗、７……可変抵抗、８，１０，
１６，１７，１９，２５……コンデンサ、１１…
…コイル、１８……コントラス量検出回路、２０
……微分回路、２１……反転微分回路、２４……
アンプ、２４ａ……反転アンプ、２８……シヤー
プネス補正回路。
Fig. 1 is a circuit diagram showing an embodiment of the sharpness circuit according to the present invention, Fig. 2 a to f are operation waveform diagrams of various parts to explain the operation of the circuit shown in Fig. 1, and Fig. 3 is a conventional sharpness circuit diagram. FIG. 4 is a circuit diagram showing a specific example of the sharpness circuit shown in FIG. 3; FIG.
FIGS. a to i are operation waveform diagrams of each part for explaining the operation of the circuit shown in FIG. 4. 5...Sharpness circuit, 6, 22, 23, 3
0...Transistor, 9, 12, 14, 26, 2
7,29...Resistance, 7...Variable resistance, 8,10,
16, 17, 19, 25... Capacitor, 11...
...Coil, 18...Contrast amount detection circuit, 20
... Differential circuit, 21 ... Inverting differentiator circuit, 24 ...
Amplifier, 24a...Inverting amplifier, 28...Sharpness correction circuit.
Claims (1)
した部分を強調して表示画面の鮮鋭度を高めるシ
ヤープネス回路において、前記ビデオ信号のコン
トラスト量を検出するコントラスト量検出回路と
、このコントラスト量検出回路から出力されるコ
ントラスト量信号に応じて前記シヤープネス回路
のシヤープネス補正量を制御するシヤープネス制
御回路とを付加したことを特徴とするシヤープネ
ス回路。 (2) コントラスト量検出回路は、ビデオ信号を
微分する微分回路と、ビデオ信号の極性反転信号
を微分する反転微分回路と、前記微分回路および
反転微分回路の出力をそれぞれベース入力とする
同一極性の第１および第２のトランジスタとによ
つて構成され、この第１および第２のトランジス
タにおける出力の合成値をコントラスト量信号と
して出力することを特徴とする実用新案登録請求
の範囲第１項記載のシヤープネス回路。[Claims for Utility Model Registration] (1) A contrast amount detection circuit that detects the contrast amount of the video signal in a sharpness circuit that enhances the sharpness of a display screen by emphasizing a portion of the video signal that corresponds to the outline of an image. and a sharpness control circuit that controls the sharpness correction amount of the sharpness circuit in accordance with the contrast amount signal output from the contrast amount detection circuit. (2) The contrast amount detection circuit includes a differentiating circuit for differentiating a video signal, an inverting differentiator for differentiating a polarity-inverted signal of the video signal, and a same-polarity differential circuit whose base inputs are the outputs of the differentiating circuit and the inverting differentiator, respectively. A utility model according to claim 1, wherein the utility model is configured by a first transistor and a second transistor, and outputs a composite value of outputs from the first and second transistors as a contrast amount signal. Sharpness circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6589087U JPS63173975U (en) | 1987-04-30 | 1987-04-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6589087U JPS63173975U (en) | 1987-04-30 | 1987-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63173975U true JPS63173975U (en) | 1988-11-11 |
Family
ID=30903382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6589087U Pending JPS63173975U (en) | 1987-04-30 | 1987-04-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63173975U (en) |
-
1987
- 1987-04-30 JP JP6589087U patent/JPS63173975U/ja active Pending
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