JPS60130291A - Multisystem television receiver - Google Patents
Multisystem television receiverInfo
- Publication number
- JPS60130291A JPS60130291A JP23817883A JP23817883A JPS60130291A JP S60130291 A JPS60130291 A JP S60130291A JP 23817883 A JP23817883 A JP 23817883A JP 23817883 A JP23817883 A JP 23817883A JP S60130291 A JPS60130291 A JP S60130291A
- Authority
- JP
- Japan
- Prior art keywords
- pal
- circuit
- secam
- video signal
- differential amplifier
- 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.)
- Granted
Links
Landscapes
- Color Television Systems (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はＮＴＳＣ，ＰＡＬ、ＳＥＣＡＭ方式のいす程の
放送方式でも受像出来る多方式テレビジョン受像機のク
シ型フィルター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 comb-shaped filter circuit for a multi-system television receiver capable of receiving images from various broadcast systems such as NTSC, PAL, and SECAM systems.
従来例の構成とその問題点
近年、ＮＴＳＣ，ＰＡＬ、ＳＥＣＡＭ方式のどの放送方
式をも受像出来る多方式テレビジョン受像機が名案され
る様になってきた。また一方ではＮ Ｔ Ｓ Ｃ方式で
はクロスカラーおよび解像度の改善の為、カラーテレビ
電波の周波数インターリビングの原理全利用したくし型
フィルター回路が考案されている。Conventional configurations and their problems In recent years, multi-system television receivers that can receive any broadcast system such as NTSC, PAL, and SECAM systems have been proposed. On the other hand, in the NTSC system, in order to improve cross-color and resolution, a comb-type filter circuit has been devised that fully utilizes the frequency interleaving principle of color television radio waves.
以下図面全参照しながら説明する。第１図は従来例の多
方式テレビジョン受像機の構成を示すブロック図である
。ここで、入力さハた映像信号（弓１、一つは遅延線１
．クロマトラップ回路５を辿して輝度仏゛シづを収り出
し、ビデオ制御回路６へ供給される。また一方でこの映
像信号は各方式に応じて、ＰＡＬ信号用のバントハスフ
ィルター１司路２あるいＨＮＴＳＣ（ｉ活用のバンドパ
スフィルター回路３を通り、ＰＡＬ あるいげＮＴＳＣ
クロマ復調回路７へ供給される。さらにもう一方でＳＥ
ＣＡＭ信号用のベルフィルター回路４を通り、ＳＥＣＡ
Ｍクロマ復調回路８へ供給される。そしてビデオ制御回
路６を通ったが１１１信号と各方式に応じたクロマ復調
回路７あるい１１７Ｊ：８ヲ辿ってきたクロマ信号をビ
デオ増幅回路９てミックスしてＣＲＴ１○へ供給してい
る。The following description will be given with reference to all the drawings. FIG. 1 is a block diagram showing the configuration of a conventional multi-system television receiver. Here, the input video signal (bow 1, one delay line 1
．． The luminance signals are collected through the chroma trap circuit 5 and supplied to the video control circuit 6. On the other hand, this video signal passes through a band pass filter 1 circuit 2 for PAL signals or a band pass filter circuit 3 for HNTSC (i-utilization), depending on each system.
The signal is supplied to the chroma demodulation circuit 7. Furthermore, on the other hand, SE
Passes through the bell filter circuit 4 for the CAM signal and is sent to the SECA
The signal is supplied to the M chroma demodulation circuit 8. Then, the 111 signal that has passed through the video control circuit 6 and the chroma signal that has been traced through the chroma demodulation circuit 7 or 117J:8 depending on each system is mixed by the video amplifier circuit 9 and supplied to the CRT 1○.
捷た第２図はＮＴＳＣ方式のみしか受像出来ないテレビ
ジョン受像機のクシ型フィルター回路の従来例の回路図
である。FIG. 2 is a circuit diagram of a conventional example of a comb-shaped filter circuit for a television receiver that can only receive images according to the NTSC system.
ここで、入力された映像信号はインピーダンス変換用ト
ランジスタ１１を通りそのエミッタより、１つはコンデ
ンサ１２から抵抗１４および抵抗１５全＋Ｉｊ！リトラ
ンジスタ１８および１９の各コレクタに供給される。寸
だ一方ではトランジスタ１１のエミッタより抵抗２６お
よびコンデンサ２７を介して１Ｈデイレイライン１３に
加えられた映家信けは１水平走査期間遅延され、互いに
逆位相でトランジスタ１８および１９のベースへ供給さ
れる。Here, the input video signal passes through the impedance conversion transistor 11 and from its emitter, one from the capacitor 12, one from the resistor 14 and one from the resistor 15 +Ij! It is supplied to each collector of transistors 18 and 19. On the other hand, the video signal applied to the 1H delay line 13 from the emitter of the transistor 11 via the resistor 26 and the capacitor 27 is delayed by one horizontal scanning period, and is supplied to the bases of the transistors 18 and 19 in opposite phases to each other. Ru.
そこで上記遅延されずに供給された映像信号とミックス
されて、トランジスタ１８のコレクタにはクロマ信号成
分のみを含む映像信号が生じ、インピーダンス変換用ト
ランジスタ２５のベースに加わり、そのエミッタからＮ
ＴＳＣバンドパスフィルター回路３へ供給されている。There, a video signal containing only the chroma signal component is generated at the collector of the transistor 18 by being mixed with the video signal supplied without delay, and is applied to the base of the impedance conversion transistor 25, and from its emitter to the N
The signal is supplied to the TSC bandpass filter circuit 3.
また一方トランジスタ１９のコレクタには輝度信号成分
のみを含む映像信号が生じ、インピーダンス変換用トラ
ンジスタ２４のベースに加わりそのエミッタから遅延線
１へ供給される。上記クシ型フィルター回路によりＮＴ
ＳＣ方式のときはクロスカラーおよび解像度が改善され
る。しかしながらＳＥＣＡＭ方式ではクロマ信号をＦＭ
変調していることから」−記回路を使用しても原理的に
色信号成分のみと輝度信号成分のみだけの２つの映像４
Ｍ号に分離することが出来ない。On the other hand, a video signal containing only a luminance signal component is generated at the collector of the transistor 19, and is applied to the base of the impedance conversion transistor 24, and is supplied to the delay line 1 from its emitter. NT by the above comb filter circuit.
When using the SC method, cross color and resolution are improved. However, in the SECAM system, the chroma signal is
Even if the circuit described above is used, in principle, two images containing only the color signal component and only the luminance signal component can be generated.
It cannot be separated into M.
またＰＡＬ方式ではインターリーブされる位置がＮＴＳ
Ｃ方式とは異なる為Ｎ’ＴＳＣ方式よりさらにミックス
する映像信号の遅延時間を長く取る必要が有る。（約２
水平走査期間）この為急激な色変化部分を含む映像では
色情報成分の不連続さが目立ち、画面かかえ−）て見ず
らくなるという著しい欠点が生じてくる。Also, in the PAL system, the interleaved position is NTS
Since this method is different from the C method, it is necessary to provide a longer delay time for the video signal to be mixed than the N'TSC method. (about 2
For this reason, in an image containing a sharp color change portion, the discontinuity of color information components becomes noticeable, resulting in a significant drawback in that the screen is distorted and becomes difficult to view.
発明の目的
本発明は、ＮＴＳＣ方式のときはクシ型フィルター回路
の利点を生かし、ＰＡＬおよびＳＥＣＡＭ方式のときは
クンノ（１２フイルタ一回路の影響をなくして、いずえ
１の方式でも良好に受像することのできる多方ｒ（テレ
ビジョン受像機を提供することを目的とする。Purpose of the Invention The present invention utilizes the advantages of a comb-shaped filter circuit in the case of the NTSC system, and eliminates the influence of a 12-filter circuit in the case of the PAL and SECAM systems, so that images can be received well in any system. The purpose of the present invention is to provide a multi-purpose television receiver that is capable of
発明の構成
本発明による多方式テレビジョン受像機は、ベースに一
水＼＋’〕を査ｊυ］間遅延された位相が互いに異なる
映像イ１、弓が加わる差動増幅器の谷コレクタに−そノ
１ぞわ抵４１１．を介して映像信号を加えその差動増１
１１１′ｌ’餅：、のｈ−ｌレクタ出力端にメ１１（度
情号成分のみを汁９Ｊ−吠１’Ｖイ、ｉｒ”、とクロマ
信号成分のみを含む映像（ｉ号介′取り出すクツ型フィ
ルター回路を構成し、上記１′（動増ｌｌ’ｉ＋ｉ器の
エミッタを抵抗を介して互いに接続［７この」と続点ゲ
ダイオードを介してアースに接続するとともに、差動ｊ
’ｉ’ｊ幅器のベースにＮＴＳＣ方式のときは差動増幅
器として動作せしめ、ＰＡＬおＪ：びＳＥＣＡＭ方式の
ときは差動増幅器が遮断する様に作用する切換回路を接
続し差動増幅器の各コレクタ出力端にＰＡＬおよびＳＥ
ＣＡＭのときに擬似負荷として接続される回路をもうけ
たものであり、ＰＡＬおよびＳＥＣＡＭ方式のときとＮ
ＴＳＣ方式のときの映像のＤＣレベルをそろえ、ＰＡＬ
およびＳＥＣＡＭ方式のときは従来の性能を維持しＮ
Ｔ Ｓ Ｃ方式のときはクロスカラーおよび解像度を改
善する効果をもつものである。Structure of the Invention The multi-system television receiver according to the present invention has a base having one water ＼+'], an image 1 whose phases are different from each other and which are delayed for a period of time, and a trough collector of a differential amplifier to which a bow is applied. No1 Zowa Resistance 411. Add the video signal through the differential amplification 1
111'l'mochi: The output terminal of the h-l receiver outputs the image containing only the chroma signal component. A shoe-type filter circuit is constructed, and the emitters of the dynamic multipliers 1'(1') are connected to each other via a resistor [7] and connected to the ground via a connecting diode, and the differential j
A switching circuit is connected to the base of the 'i'j amplifier to operate it as a differential amplifier in the case of the NTSC system, and to cut off the differential amplifier in the case of the PAL and SECAM systems. PAL and SE on each collector output
It has a circuit that is connected as a pseudo load when using CAM, and is different from when using PAL and SECAM systems.
Align the DC level of the video when using the TSC method, and
And when using the SECAM method, the conventional performance is maintained and N
The TSC method has the effect of improving cross color and resolution.
実施例の説明
り、下水発明の一実施例について図面を径照しながら説
明する。第３図は本発明の一実施例における多方式テレ
ビジョン受像機の回路図ケ示すものである。尚、図中、
第１図、第２図中と同一素子。DESCRIPTION OF EMBODIMENTS An embodiment of the sewage invention will be described with reference to the drawings. FIG. 3 shows a circuit diagram of a multi-system television receiver according to an embodiment of the present invention. In addition, in the figure,
Same element as in FIGS. 1 and 2.
回路には同一番号ケ付している。The circuits are numbered the same.
ダイオード２９はアノード全紙」冗１６，１７を通して
トランジスタ１８．１９のベースに接続し、カソードを
方式切換回路３Ｏに接続したものであり、捷たダイオー
ド２８はアノードを抵抗２３にカソードをアースに接続
したものである。The diode 29 is connected to the base of the transistor 18 and 19 through the anodes 16 and 17, and the cathode is connected to the system switching circuit 3O, and the cut diode 28 has its anode connected to the resistor 23 and its cathode connected to the ground. It is something.
ＮＴＳＣ方式のときは方式切換回路３ｏより高レベルの
電圧が出力されるので、ダイオード２９は遮断しクシ型
フィルター回路を構成している差動増幅トランジスタ１
８および１９が動作し、インピーダンス変換用トランジ
ス２４のエミッタからは輝度信号成分のみを含む映像信
号が供給され、もう一方のインピーダンス変換用トラン
ジスタ２ξのエミッタからはクロマ信号成分のみを含む
映像信号が供給されＮＴＳＣバンドパスフィルタ回路３
へ導かれる。In the case of the NTSC system, a high level voltage is output from the system switching circuit 3o, so the diode 29 is cut off and the differential amplification transistor 1 constituting the comb-shaped filter circuit
8 and 19 operate, the emitter of the impedance conversion transistor 24 supplies a video signal containing only the luminance signal component, and the emitter of the other impedance conversion transistor 2ξ supplies a video signal containing only the chroma signal component. NTSC bandpass filter circuit 3
be led to.
一方、ＰＡＬまたｌｄｓＥｃＡＭ方式のときは、方式切
換回路より低レベルの電圧が出力されるのでダイオード
２９がオンし、トランジスタ１８および１９が遮断する
為、トランジスタ２６のベースへ入力されたもともとの
信号と同じものがトランジスタ２４およびトランジスタ
２５のエミッタから供給さｎ、トランジスタ２４からテ
ィレイライン１とＰＡＬおよびＳＥＣＡＭクロマト′ラ
ップ６全通して輝度信号を、トランジスタ２５がらはＰ
ＡＬバンドパスフィルター回路２あるいはＳＥＣＡＭベ
ルフィルター回路４へ供給している。尚、ダイオード２
８はＰＡＬおよびＳＥＣＡＭ方式のときトランジスタ１
Ｂおよび１９が完全に遮断する様挿入しているものであ
る。On the other hand, in the case of the PAL or ldsEcAM system, a low level voltage is output from the system switching circuit, so the diode 29 is turned on and the transistors 18 and 19 are cut off, so the original signal input to the base of the transistor 26 is The same is supplied from the emitters of transistors 24 and 25, from transistor 24 through the tiller line 1 and the PAL and SECAM chroma traps 6, and from transistor 25 the luminance signal is supplied from transistor 24 through the emitters of transistor 25.
The signal is supplied to an AL bandpass filter circuit 2 or a SECAM bell filter circuit 4. In addition, diode 2
8 is transistor 1 for PAL and SECAM systems
B and 19 are inserted so as to completely block them.
ところがＰＡＬおよびＳＥＣＡＭ方式時とＮＴＳＣ方式
時とで映像信号のＤＣレベルが変化してし甘い、ＰＡＬ
およびＳＥＣＡＭ時同期信号がつぶれてしまったり、放
送方式が切換わった瞬間に画面に悪影響を及ぼすという
問題がある。However, the DC level of the video signal changes between the PAL and SECAM systems and the NTSC system.
Furthermore, there are problems in that the SECAM synchronization signal is distorted and the screen is adversely affected the moment the broadcasting system is switched.
そこで本回路では、トランジスタ１８のコレクタに擬似
負荷抵抗３１．ダイオード３２全通して方式切換回路３
０へＰＡＬ、ＳＥＣＡＭ方式のとき擬似負荷３１が挿入
される様に接続し、トランジスタ１９のコレクタにも擬
似負荷抵抗３３．ダイオード３４全上記同様に接続した
回路を設け、各放送方式で映像信号のＤＣレベルが変化
しない様に補償を行なっているものである。Therefore, in this circuit, the collector of the transistor 18 is connected to the pseudo load resistor 31. Diode 32 all through system switching circuit 3
0 so that a pseudo load 31 is inserted in the PAL and SECAM systems, and a pseudo load resistor 33.0 is also connected to the collector of the transistor 19. A circuit is provided in which all of the diodes 34 are connected in the same manner as above, and compensation is performed so that the DC level of the video signal does not change in each broadcasting system.
発明の効果
以上のように本発明によ扛ば、多方式テレビジョン受像
機を構成する場合、ＰＡＬおよびＳＥＣＡＭ方式のとき
はクシ型フィルター回路を遮断し、映像信号をその廿ま
通過させ本来の性能を確保し、ＮＴＳＣ方式のときはク
シ型フィルター回路を動作させ、そのクロスカラーおよ
び解像度の改善をはかる効果を有するものである。Effects of the Invention As described above, according to the present invention, when configuring a multi-system television receiver, in the case of PAL and SECAM systems, the comb-shaped filter circuit is cut off, and the video signal is allowed to pass therethrough, thereby transmitting the original signal. This has the effect of ensuring performance, operating a comb filter circuit in the case of the NTSC system, and improving cross color and resolution.
第１図は従来例の多方式テレビジョン受像機のブロック
図、第２図はＮＴＳＣ方式のみしか受像出来ｌい従来例
のテレビジョン受像機のクシ型フィルター回路の回路図
、第３図は本発明の一実施例における多方式テレビジョ
ン受像機の回路図である。
１・・・・遅延匈、２ ・・ＰＡＬバンドパスフィルタ
ー Ｌｒ］Ｉ 路、３・・ＮＴＳＣバンドパスフィルタ
ー回路、４ ・ＳＥＣＡＭベルフィルター回に、５・・
・・・クロマトラップ回路５６・・・・ビテオ制御回路
、ア・・・・・ＰＡＬおよびＮ’ＴＳＣクロマ復調回路
、８・・・・・・ＳＥＣＡＭクロご復調回路、９・・・
・ビテオ増幅回路、１ｏ・・・、・・ＣＲＴ 、 １１
．１８．１９．２４．２５・・・・・トランジスタ、１
２．２７・・・・コンデンサ、１３・・・・・１Ｈデイ
レイライン、１４，１５，１６，１７゜２１．２２．２
３・・・・・・抵抗、２８．２９・・・・・ダイオード
、３０・・・・・・方式切換回路、３１．−３２・・・
・・・擬似負荷抵抗、３２．３４・・・・・ダイオード
。Figure 1 is a block diagram of a conventional multi-system television receiver, Figure 2 is a circuit diagram of a comb-shaped filter circuit of a conventional television receiver that can only receive images in the NTSC system, and Figure 3 is a block diagram of a conventional multi-system television receiver. FIG. 1 is a circuit diagram of a multi-system television receiver in an embodiment of the invention. 1... Delay, 2... PAL band pass filter Lr] I path, 3... NTSC band pass filter circuit, 4 - SECAM Bell filter circuit, 5...
...Chroma trap circuit 56... Video control circuit, A... PAL and N'TSC chroma demodulation circuit, 8... SECAM chroma demodulation circuit, 9...
・Video amplifier circuit, 1o...,...CRT, 11
．． 18.19.24.25...Transistor, 1
2.27...Capacitor, 13...1H delay line, 14,15,16,17゜21.22.2
3... Resistor, 28.29... Diode, 30... Method switching circuit, 31. -32...
...Pseudo load resistance, 32.34...Diode.
Claims (1)
に異なる映像信号が加わる差動増幅器の各コレクタにそ
れぞ汎抵抗を介して映像信号を加え、その差動増幅器の
各コレクタ出力端に輝度信号成分のみを含む映像信号と
クロマ信号成分のみ金含む映ｆ７：伯号を酸９出すクシ
型フィルター回路を構成し、１−、＋ｉ己差動増幅器の
エミツタを抵抗を介して互いに接続しこの接続点えでダ
イオードケ介してアースにＪｙＣ：続するどともに、差
動増幅器のベースにＮＴ ＳＣＣ方式ときは７−を動謂
幅器として動作せしめ、 ）’ＡＬ方式およびＳＥＣＡ
Ｍ方式のときは差動増幅器が遮ｌｌＪ＋する様に作用す
る切換回路を接続し、差動増幅器の４コレクタ出力端に
ＰＡＬ およびＳＥＣＡＭ方式のときに擬似負荷として
接続される回路を設けた多方式テレビジョン受像機。A video signal is applied to each collector of the differential amplifier via a general resistor, and the video signal is applied to each collector of the differential amplifier through a general resistor, and each collector output of the differential amplifier Construct a comb-shaped filter circuit that outputs a video signal containing only the luminance signal component and a video signal containing only the chroma signal component at the ends, and connect the emitters of the differential amplifiers 1- and +i to each other via a resistor. At this connection point, connect JYC to the ground via the diode. At the same time, when using the NTSCC method, 7- is operated as a swing amplifier at the base of the differential amplifier. )'AL method and SECA
In the case of the M method, a switching circuit that acts as if the differential amplifier is shielded is connected, and in the case of the PAL and SECAM methods, a circuit is connected to the four collector output terminals of the differential amplifier as a pseudo load. television receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23817883A JPH0228951B2 (en) | 1983-12-16 | 1983-12-16 | TAHOSHIKITE REBIJONJUZOKI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23817883A JPH0228951B2 (en) | 1983-12-16 | 1983-12-16 | TAHOSHIKITE REBIJONJUZOKI |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60130291A true JPS60130291A (en) | 1985-07-11 |
| JPH0228951B2 JPH0228951B2 (en) | 1990-06-27 |
Family
ID=17026331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23817883A Expired - Lifetime JPH0228951B2 (en) | 1983-12-16 | 1983-12-16 | TAHOSHIKITE REBIJONJUZOKI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0228951B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG79900A1 (en) * | 1989-11-17 | 2001-04-17 | Rca Thomson Licensing Corp | A video comp filter |
-
1983
- 1983-12-16 JP JP23817883A patent/JPH0228951B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG79900A1 (en) * | 1989-11-17 | 2001-04-17 | Rca Thomson Licensing Corp | A video comp filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0228951B2 (en) | 1990-06-27 |
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