JPH0271675A - Frequency switching circuit for picture contour correcting device for tv receiver - Google Patents
Frequency switching circuit for picture contour correcting device for tv receiverInfo
- Publication number
- JPH0271675A JPH0271675A JP63222258A JP22225888A JPH0271675A JP H0271675 A JPH0271675 A JP H0271675A JP 63222258 A JP63222258 A JP 63222258A JP 22225888 A JP22225888 A JP 22225888A JP H0271675 A JPH0271675 A JP H0271675A
- Authority
- JP
- Japan
- Prior art keywords
- switching
- receiver
- frequency
- peaking
- speed modulation
- 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
- 239000003990 capacitor Substances 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 description 8
- 235000013365 dairy product Nutrition 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
Landscapes
- Picture Signal Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、陰極線管（ＣＲＴ）を使用した’ｒｖ受像機
の画像輪郭補正器用周波数切換回路に関するものである
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a frequency switching circuit for an image contour corrector of an 'RV receiver using a cathode ray tube (CRT).
（従来の技術）
従来のＴＶ受像機の画像輪郭補正器（以下、速度変調回
路という）は１周波数特性の切換装置を具備せず、固定
された周波数特性を持つものであつた・
この速度変調回路は、第３図にそのブロック構成図を示
すように、フィルタ部１０及び速度変調信号・出力部２
０より構成される。この速度変調回路に人力されたビデ
オ信号Ｓ工はフィルタ部１０において周波数特性が決め
られ、その後、速度変調信号出力部２０で微分され、か
つ増幅された速度変調信号が速度変調用コイル３０に出
力される。(Prior art) The image contour corrector (hereinafter referred to as speed modulation circuit) of a conventional TV receiver does not have a switching device for one frequency characteristic and has a fixed frequency characteristic. As shown in the block diagram of FIG. 3, the circuit includes a filter section 10 and a speed modulation signal/output section 2.
Consists of 0. The frequency characteristics of the video signal S input manually into the speed modulation circuit are determined in the filter section 10, and then differentiated in the speed modulation signal output section 20, and the amplified speed modulation signal is output to the speed modulation coil 30. be done.
（発明が解決しようとする課題）
さて、＠近のＴＶ受像機はビデオ入力端子が備えられる
ことが一般化されており、ＴＶ放送のみならずビデオ入
力からの画像を見ることが多くなってきた。ところが、
１゛ｖ放送とビデオ入力では周波数帯域が異なり、ＴＶ
受像機の速度変調回路もそれに応じて適した周波数特性
を持つことが望ましい。(Problem to be solved by the invention) Now, it has become common for modern TV receivers to be equipped with video input terminals, and it has become common for people to view images not only from TV broadcasts but also from video inputs. . However,
1゛V broadcasting and video input have different frequency bands, so TV
It is desirable that the speed modulation circuit of the receiver also has appropriate frequency characteristics.
本発明は、このような要望を満足させるため、画像ソー
スに応じて適切に速度変調回路の周波数特性を切換でき
るようにすることを［１的とするものである。In order to satisfy such demands, the present invention aims to enable the frequency characteristics of a speed modulation circuit to be appropriately switched depending on the image source.
（課題を解決するための手段）
本発明は第１図のブロック構成図に示すようにフィルタ
部ｌＯに周波数特性切換部４０を配設し、ビデオ／ＴＶ
切換信号Ｓ“２あるいは手動スイッチにより上記フィル
タ部１０での周波数を切換えるように構成したことを特
徴とする。(Means for Solving the Problems) As shown in the block diagram of FIG.
The present invention is characterized in that the frequency in the filter section 10 is switched by a switching signal S"2 or a manual switch.
（作 用）
速度変調回路に入力されたビデオ信号Ｓ、は、フィルタ
部１０で、その周波数特性が決められる。(Function) The frequency characteristics of the video signal S input to the speed modulation circuit are determined by the filter section 10.
その後、速度変調信号出力部２０により微分され、かつ
増幅された速度変調信号が速度変調用コイル３０に加え
られることは従来と同様である。本発明は周波数特性切
換部４０において、ビデオ／’ｒＶ切換信号Ｓ、あるい
は手動スイッチによ−〕でフィルタ部ｌＯでの周波数特
性が切替えられ１画像ソースに適切な速度変調回路の周
波数特性として画像の品質向」二をはかるものである。Thereafter, the speed modulation signal that has been differentiated and amplified by the speed modulation signal output section 20 is applied to the speed modulation coil 30, as in the conventional case. In the present invention, in the frequency characteristic switching section 40, the frequency characteristic in the filter section 10 is switched by the video/'rV switching signal S or by a manual switch, and the frequency characteristic of the speed modulation circuit suitable for one image source is changed to the frequency characteristic of the speed modulation circuit suitable for one image source. It measures the quality of the product.
（実施例）
第１図は本発明の一実施例のブロック構成図であり、そ
の構成及び動作は上記のとおりであり、その具体回路図
を第２図により説明する。(Embodiment) FIG. 1 is a block configuration diagram of an embodiment of the present invention, and its configuration and operation are as described above, and a specific circuit diagram thereof will be explained with reference to FIG. 2.
図において、１−ランジスタロはフィルタ部１０の途中
にあり、そのベースに入力されたビデオ信号Ｓ工は、コ
レクタから出力段６０へ出力される。In the figure, the 1-range star is located in the middle of the filter section 10, and the video signal S input to its base is outputted from the collector to the output stage 60.
また、トランジスタ６のコレクタとエミッタには夫々イ
ンダクタ５とコンデンサ４が接続されており、出力にピ
ーキングを掛けている。Further, an inductor 5 and a capacitor 4 are connected to the collector and emitter of the transistor 6, respectively, and peaking is applied to the output.
周波数特性切換部４０（破線枠内）のトランジスタ１の
コレクタにはコンデンサ２とバイアス抵抗３が接続され
、コンデンサ２は抵抗７を介してトランジスタ６のエミ
ッタ（及びコンデンサ４）に接続されている。A capacitor 2 and a bias resistor 3 are connected to the collector of the transistor 1 of the frequency characteristic switching section 40 (inside the broken line frame), and the capacitor 2 is connected to the emitter of the transistor 6 (and the capacitor 4) via a resistor 7.
トランジスタ１はそのベースに加わる切換信号Ｓ２によ
ってＯＮ ／ ＯＦＦ制御されてスイッチングトランジ
スタとして動作させ、その飽和領域で使用する。The transistor 1 is ON/OFF controlled by a switching signal S2 applied to its base to operate as a switching transistor, and is used in its saturation region.
次に」−記スイツチングトランジスタ１の０Ｎ１０ＦＦ
動作について説明する。Next, 0N10FF of switching transistor 1
The operation will be explained.
（ｉ）スイッチングトランジスタ１がＯＦＦの時トラン
ジスタ６のベースに入力されたビデオ信号Ｓ、は、イン
ダクタ５（３３μ）とコンデンサ４（８２ｐ）によって
ピーキングをかけられる。第２図の例ではピークの周波
数ｆｏ、は。(i) When the switching transistor 1 is OFF, the video signal S input to the base of the transistor 6 is peaked by the inductor 5 (33μ) and the capacitor 4 (82p). In the example of FIG. 2, the peak frequency fo is.
ｆｏ、＝１／２ｔｃ ｐ Ｘ ｐ ４３．０５Ｍ
Ｈｚとなる。fo, = 1/2tc p X p 43.05M
Hz.
（ｉｆ）スイッチングトランジスタ１がＯＮの時トラン
ジスタ６でのピーキング容量は、コンデンサ４と２ （
４７０ｐ ）の和となり、ピークの周波数ｆｏ、は、
ｆ ｏ２＝１／２ｃ ｐ Ｘ ｐ ＋４０ｐ
４１．１８ＭＨｚとなる。(if) When switching transistor 1 is ON, the peak capacitance of transistor 6 is as follows: capacitors 4 and 2 (
470p), and the peak frequency fo is: fo2=1/2c p X p +40p
The frequency becomes 41.18MHz.
このような動作によって、トランジスタｌを切替信号Ｓ
２により０Ｎ１０ＦＦさせることにより、ピーキングの
容量を変え、周波数特性を変化することができる。By such an operation, the transistor l is switched to the switching signal S.
By setting 0N10FF by 2, the peaking capacity can be changed and the frequency characteristics can be changed.
（発明の効果）
以上説明したように本発明の速度変調回路は、ＴＶ受像
機の画像ソースに応じて、周波数特性を変えることが出
来通常のＴＶ放送はもちろん、近年発展のめざましい高
画質ソース（Ｓ−ＶＨＳやＬＤ等）にも最適な画像の１
郭補正効果を得ることが出来る。(Effects of the Invention) As explained above, the speed modulation circuit of the present invention can change the frequency characteristics depending on the image source of the TV receiver, and can be used not only for ordinary TV broadcasting but also for high-quality video sources that have been developed in recent years. One of the most suitable images for S-VHS, LD, etc.
A contour correction effect can be obtained.
４、 図面のｍ １１先な説明
第１図は本発明の一実施例によるブロック構成図、第２
図は第１図の具体回路図、第３図は従来の速度変調回路
のブロック構成図である。4. Figure 1 is a block configuration diagram according to an embodiment of the present invention, and Figure 2 is a block diagram of an embodiment of the present invention.
This figure is a specific circuit diagram of FIG. 1, and FIG. 3 is a block diagram of a conventional speed modulation circuit.
１．６ ・・・ トランジスタ、 ２，４ ・・・コン
デンサ、 ３ ・・・バイアス抵抗、 ５ ・・・イン
ダクタ、 ７ ・・・抵抗、１０・・・ フィルタ部、
２０・・・速度変調信号出力部、３０・・・速度変調コ
イル、４０・・・周波数特性切換部。1.6... Transistor, 2,4... Capacitor, 3... Bias resistor, 5... Inductor, 7... Resistor, 10... Filter section,
20... Speed modulation signal output section, 30... Speed modulation coil, 40... Frequency characteristic switching section.
特許出願人 松下電器産業株式会社 第 図 速７焚反網目酪 第 図 第 図 Ｊｊ玄Ｓ’Ｊ口ＪさPatent applicant: Matsushita Electric Industrial Co., Ltd. No. figure Speed 7 firing anti-mesh dairy No. figure No. figure Jj Gen S’J mouth J
Claims (1)
応じて、ピーキング用コンデンサの容量をトランジスタ
のスイッチング動作で切換えることにより周波数特性の
切換えを行うことを特徴とするＴＶ受像機の画像輪郭補
正器用周波数切換回路。Image contour correction for a TV receiver, characterized in that frequency characteristics are switched by switching the capacitance of a peaking capacitor by a switching operation of a transistor, depending on the image source input to the image contour corrector of the TV receiver. Dexterity frequency switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63222258A JPH0271675A (en) | 1988-09-07 | 1988-09-07 | Frequency switching circuit for picture contour correcting device for tv receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63222258A JPH0271675A (en) | 1988-09-07 | 1988-09-07 | Frequency switching circuit for picture contour correcting device for tv receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0271675A true JPH0271675A (en) | 1990-03-12 |
Family
ID=16779572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63222258A Pending JPH0271675A (en) | 1988-09-07 | 1988-09-07 | Frequency switching circuit for picture contour correcting device for tv receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0271675A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50116130A (en) * | 1974-02-25 | 1975-09-11 | ||
| JPS58565B2 (en) * | 1976-05-17 | 1983-01-07 | 株式会社日立製作所 | Turbine support device |
| JPS6224779A (en) * | 1985-07-25 | 1987-02-02 | Sony Corp | Luminance signal band switching circuit for television receiver |
| JPS6242375B2 (en) * | 1983-08-02 | 1987-09-08 | Oki Electric Ind Co Ltd | |
| JPS63123275A (en) * | 1986-11-12 | 1988-05-27 | Mitsubishi Electric Corp | Outline correcting device for video |
-
1988
- 1988-09-07 JP JP63222258A patent/JPH0271675A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50116130A (en) * | 1974-02-25 | 1975-09-11 | ||
| JPS58565B2 (en) * | 1976-05-17 | 1983-01-07 | 株式会社日立製作所 | Turbine support device |
| JPS6242375B2 (en) * | 1983-08-02 | 1987-09-08 | Oki Electric Ind Co Ltd | |
| JPS6224779A (en) * | 1985-07-25 | 1987-02-02 | Sony Corp | Luminance signal band switching circuit for television receiver |
| JPS63123275A (en) * | 1986-11-12 | 1988-05-27 | Mitsubishi Electric Corp | Outline correcting device for video |
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