JPS58223983A - Signal converter - Google Patents
Signal converterInfo
- Publication number
- JPS58223983A JPS58223983A JP10902282A JP10902282A JPS58223983A JP S58223983 A JPS58223983 A JP S58223983A JP 10902282 A JP10902282 A JP 10902282A JP 10902282 A JP10902282 A JP 10902282A JP S58223983 A JPS58223983 A JP S58223983A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- pal
- color
- chroma
- balanced
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/20—Conversion of the manner in which the individual colour picture signal components are combined, e.g. conversion of colour television standards
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Television Systems (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はNTSC方式のカラーテレビジョン信号をブラ
ジル等で採用されているPAL−M方式のカラーテレビ
ジョン信号に変換するに好適な信号変換装置に係る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal conversion device suitable for converting an NTSC color television signal to a PAL-M color television signal adopted in Brazil and other countries.
一般にN T S C,方式とPAL−M方式の各カラ
ーテレビジョン信号は水平、垂直の両走査周波数は同一
であり、輝度信号成分としては差はなくただクロマ信号
成分のみが異なっている。この相逮点はクロマ信号の色
副搬送波周波数か−i/H(但し/Hは水平走査周波数
)即ち8.934 KHzだけシフトしている点と、ク
ロマ信号のベクトルがB−Y軸を中心としてIH(1水
平走査期間)ごとに反転されている点である。In general, color television signals of the NTSC and PAL-M systems have the same horizontal and vertical scanning frequencies, and there is no difference in luminance signal components, only chroma signal components. This phase point is the point where the color subcarrier frequency of the chroma signal is shifted by -i/H (where /H is the horizontal scanning frequency), that is, 8.934 KHz, and the point where the vector of the chroma signal is centered on the B-Y axis. This point is inverted every IH (one horizontal scanning period).
本発明はこのような点傾鑑みなされたものであり、放送
局或いはVTR等から得られるNTSC方式のカラーテ
レビジョン信号を簡単にPAL−M方式のカラーテレビ
ジョン信号に変換することができる信号変換装置を提供
するものである。The present invention has been made in view of the above points, and is a signal conversion method that can easily convert an NTSC color television signal obtained from a broadcasting station, a VTR, etc. into a PAL-M color television signal. It provides equipment.
特に本発明では簡単な構成により3.579545MH
z のNTSC方式の色副搬送波信号を3.5756
11MHzのPAL−M方式の色副搬送波信号に変換す
ると同時にB−Y軸に対してI Hごとに反転してPA
L−M方式のカラーテレビジョン信号を得るものである
。In particular, in the present invention, with a simple configuration, 3.579545MH
The NTSC color subcarrier signal of z is 3.5756
At the same time, it is converted into a 11MHz PAL-M color subcarrier signal and inverted for each IH with respect to the B-Y axis.
This is to obtain an LM system color television signal.
以下図面に示す実施例とともに本発明を説明す゛る。図
面は本発明の一実施例のブロック線図を示し、ここでは
寸ず入力端子lにNTSC方式の複合映像信号か供給さ
れ、また入力端子2に水平同期パルスが供給される。い
まこの複合映像信号はバンドパスフィルタ3に通され、
このフィルタ3を介して3.579545MHzの色副
搬送波成分を有するNTSC方式のクロマ信号が導出さ
れる。The present invention will be described below with reference to embodiments shown in the drawings. The drawing shows a block diagram of an embodiment of the invention, in which an NTSC composite video signal is supplied to the input terminal 1, and a horizontal synchronizing pulse is supplied to the input terminal 2. This composite video signal is now passed through a bandpass filter 3,
An NTSC chroma signal having a color subcarrier component of 3.579545 MHz is derived through this filter 3.
4 ′″0″°〜信報平衡′酎“醇7江耐
ばて基準信号発振器5より得られる7155155MH
zの基準信号に基いて平衡変調される。この結果該平衡
変調器4からバンドパスフィルタ6を介して色副搬送波
成分が3.575611MHzに周波数変換されたクロ
マ信号が取出され、これがB−Y復調器7及びR−Y復
調器8に供給される。4 ′″0″°~Signal balance ′′chu” 7155155MH obtained from the reference signal oscillator 5
Balanced modulation is performed based on the z reference signal. As a result, a chroma signal in which the color subcarrier component is frequency-converted to 3.575611 MHz is extracted from the balanced modulator 4 via the bandpass filter 6, and this is supplied to the BY demodulator 7 and the R-Y demodulator 8. be done.
一方入力端子2妃供給された水平同期パルスはフリップ
70ツブ9に供給され、このフリップフロップ9はII
(ごとに反転駆動される。フリップフロップ9から得ら
れるIH切換パルスは、PALスイッチ10に供給され
、PALスイッヂ10ではIHごとに極性反転動作が行
なわれる。On the other hand, the horizontal synchronizing pulse supplied to input terminal 2 is supplied to flip-flop 70, and this flip-flop 9 is connected to II
The IH switching pulse obtained from the flip-flop 9 is supplied to the PAL switch 10, and the PAL switch 10 performs a polarity inversion operation for each IH.
11はPAL−M方式の色副搬送波周波数に合致した3
、575611MHzの色副搬送波発振器であり、この
発振器11より発振された3、575611MHzの副
搬送波信号はPALスイッチ10にてLHごとに極性反
転されたのちR−Y復調器8に供給される一方、コンデ
ンサC1及び抵抗R1よりなる90°位相器12を介し
て90°位相シフトされたのち、B−Y復調器7に供給
される。 1このような結果、上記B−Y復
調器7ではB−Y色差信号が復調され、またB−Y復調
器8−ではR−Y色差信号が復調される。なお、ここで
R−Y復調器8より得られる色差信号成分はIHごとに
様性反転ぶれている。11 is 3 that matches the color subcarrier frequency of the PAL-M system.
, 575,611 MHz color subcarrier oscillator, and the 3,575,611 MHz subcarrier signal oscillated by this oscillator 11 is inverted in polarity for each LH by the PAL switch 10 and then supplied to the R-Y demodulator 8. After being phase-shifted by 90° via a 90° phase shifter 12 consisting of a capacitor C1 and a resistor R1, the signal is supplied to a BY demodulator 7. 1 As a result, the BY demodulator 7 demodulates the BY color difference signal, and the BY demodulator 8- demodulates the RY color difference signal. Note that the color difference signal components obtained from the RY demodulator 8 are modally inverted and blurred for each IH.
なおこの場合、上記雨後調器7,8には入力端“子2よ
り水平同期パルスが供給され、これにより復調器7,8
では特にクロマ信号中に含まれるバースト信号のブラン
キング動作が同時に行なわれる。In this case, the horizontal synchronizing pulse is supplied from the input terminal 2 to the post-rain modulators 7 and 8, and as a result, the demodulators 7 and 8
In particular, a blanking operation for the burst signal included in the chroma signal is performed at the same time.
こうして上記復調器7,8より得られる各色差信号はそ
れぞれB−Y変調器13及びR−Y変調器14に供給さ
れる。このR−Y変調器14には色副搬送波発振器9よ
り得られる3、 575611MHzの色副搬送波信号
が供給され、寸たB−Y変調器13にはコイルL1及び
コンデンサC2からなる90°移相器15を介して90
°位相シフトされた色副搬送波信号が供給される。この
結果両度調器13.14でばB−Y色差信号とR−Y色
差信号とが90’位相差をもうた3、575611MH
zの色副搬送波で直角2相変調され、これら変調18号
は混合器16に供給される。In this way, each color difference signal obtained from the demodulators 7 and 8 is supplied to a BY modulator 13 and an RY modulator 14, respectively. The R-Y modulator 14 is supplied with a color subcarrier signal of 3.575611 MHz obtained from the color subcarrier oscillator 9, and the B-Y modulator 13 is supplied with a 90° phase shift signal consisting of a coil L1 and a capacitor C2. 90 through vessel 15
A phase shifted color subcarrier signal is provided. As a result, in both scales 13.14, the B-Y color difference signal and the R-Y color difference signal have a phase difference of 90', 3,575611MH
These modulation numbers 18 are quadrature-two-phase modulated with the color subcarrier of z and are supplied to a mixer 16.
さらにここではPALスイッチ10を介して1Hごとに
極性反転された3、575611MHzの基準信号がバ
ースト信号発生器17に供給され、寸た入力端子2より
水平同期パルスが供給され、これら各信号を基にして該
発生器17において−(B−Y)軸に対してIHごとに
交互に±45゜位相シフトされたPAL−M方式に合致
した)< −スト信号が作成され、このバースト信号も
捷だ上記混合器16に供給される。該混合器16では、
上記各変調器13.14より得られる各変調信号とバー
スト信号発生器17より得られるノく−スI・信号とが
混合され、このときバンドパスフィルり18を介して出
力端子19より3.575611MHzのPAL−M方
式に適合したクロマ信号が導出される。Furthermore, a reference signal of 3,575,611 MHz whose polarity is inverted every 1H is supplied to the burst signal generator 17 via the PAL switch 10, and a horizontal synchronizing pulse is supplied from the input terminal 2. Then, in the generator 17, a burst signal (matching the PAL-M method in which the phase is alternately shifted by ±45° for each IH with respect to the -(B-Y) axis) is created, and this burst signal is also switched. It is supplied to the mixer 16 mentioned above. In the mixer 16,
The modulated signals obtained from each of the modulators 13 and 14 and the noise I signal obtained from the burst signal generator 17 are mixed, and at this time, the output terminal 3. A chroma signal compatible with the 575,611 MHz PAL-M system is derived.
こうして上記実施例の信号変換装置によれば、それぞれ
2つの変、復調器7,8,13.14と2つの基準信号
発振器5,11と、さらに平衡変調器4やPALスイッ
チio等を用いた簡単な構成によって、NTSC方式の
クロマ信号をPAL−M方式のクロマ信号に変換するこ
とができる。Thus, according to the signal conversion device of the above embodiment, two modulators and demodulators 7, 8, 13 and 14, two reference signal oscillators 5 and 11, and a balanced modulator 4, a PAL switch io, etc. are used. With a simple configuration, an NTSC chroma signal can be converted into a PAL-M chroma signal.
なおNTSC方式とPA、L−M方式の両方式の輝度信
号成分については何ら変りはないため、NTSC方式の
輝度信号をそ0寸まPAL−M方式のクロマ信号と重畳
することによってPAL−M方式のカラーテレビジョン
信号を得ることかできる。Note that there is no difference in the luminance signal components of both the NTSC system and the PA and LM systems, so by superimposing the NTSC system's brightness signal with the PAL-M system's chroma signal, You can get a color television signal of any system.
以上のように本発明の信号変換装置によれば、N ’I
” S C方式のカラーテレビジョン信号を比較的簡単
にPAL−M方式のカラーテレビジョン信号に変換でき
るため、例えばNTSC方式による放送受信時だけでな
く、NTSC方式によって録画されビデオテープでもV
TRを用いて再生し、この再生カラーテレビジョン信号
を本発明装置により、一旦PAL−M方式のカラーテレ
ビジョン信号に変換すれば、PAL−M方式のテレビジ
ョン受像機においても容易に視聴することが可能となく
る・As described above, according to the signal conversion device of the present invention, N'I
” Since it is possible to convert an SC system color television signal to a PAL-M system color television signal relatively easily, it is possible to convert it into a PAL-M system color television signal relatively easily.
Once the reproduced color television signal is reproduced using TR and once converted into a PAL-M color television signal by the device of the present invention, it can be easily viewed on a PAL-M television receiver. is not possible.
4・・・平衡変調器、 5・・・基準信号発振器、7
・・・B−Y復調器、 8・・・R−Y復調器、 1
0・・・PALスイッチ、 11・・・基準信号発振
器、13・・・B−Y変調器、 14・・・R−Y変
調器、16・・混合器、 17・・・7<−スト信号
発生器。4... Balanced modulator, 5... Reference signal oscillator, 7
...B-Y demodulator, 8...R-Y demodulator, 1
0...PAL switch, 11...Reference signal oscillator, 13...B-Y modulator, 14...R-Y modulator, 16...Mixer, 17...7<-st signal generator.
Claims (1)
ともに平衡変調してクロマ信号を周波数変換する手段と
、該手段により周波数変換されたクロマ信号から第2の
基準信号を基にして第1の色信号を復調する第1の復調
手段と、前記第2の基準信号をPALスイッチに通して
LHごとに極性反転した信号を基にして前記クロマ信号
から第2の色信号を復調する手段と、前記第1の色信号
に基いて前記第2の基準信号を変調する第1の変調手段
と、前記第2の色信号に基いて前記第2の基準信号を変
調する第2の変調手段と、前記第2の基準信号を基にし
てPAL−M方式に合致したバースト信号を作成する手
段と、前記第1及び第2の変調手段より得られる両度調
信号と前記バースト信号とを混合してPAL−M方式の
クロマ信号を得る手段とを備え、NTSC方式のクロマ
信号をPAL−M方式のクロマ信号に変換することを特
徴とする信号変換装置。1. Means for converting the frequency of the chroma signal by balanced modulating the chroma signal component of the NTSC system together with a first reference signal; a first demodulating means for demodulating a color signal; a means for demodulating a second color signal from the chroma signal based on a signal whose polarity is inverted for each LH by passing the second reference signal through a PAL switch; a first modulation means that modulates the second reference signal based on the first color signal; a second modulation means that modulates the second reference signal based on the second color signal; means for creating a burst signal conforming to the PAL-M system based on the second reference signal, and mixing the both tone signals obtained from the first and second modulation means and the burst signal. 1. A signal conversion device comprising means for obtaining a PAL-M chroma signal, and converting an NTSC chroma signal into a PAL-M chroma signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10902282A JPS58223983A (en) | 1982-06-22 | 1982-06-22 | Signal converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10902282A JPS58223983A (en) | 1982-06-22 | 1982-06-22 | Signal converter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS58223983A true JPS58223983A (en) | 1983-12-26 |
JPH0145799B2 JPH0145799B2 (en) | 1989-10-04 |
Family
ID=14499604
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10902282A Granted JPS58223983A (en) | 1982-06-22 | 1982-06-22 | Signal converter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58223983A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0512861A2 (en) * | 1991-05-09 | 1992-11-11 | Nintendo Co. Limited | Color video signal standard conversion apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992008323A1 (en) * | 1990-10-31 | 1992-05-14 | Matsushita Electric Industrial Co., Ltd. | Television system converter |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5377417A (en) * | 1976-12-21 | 1978-07-08 | Sony Corp | Pal-ntsc signal converter |
JPS5394123A (en) * | 1977-01-28 | 1978-08-17 | Akai Electric | Ntsc line sequential magnetic recorder*reproducer system |
JPS5650170U (en) * | 1979-09-25 | 1981-05-02 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5378647A (en) * | 1976-12-21 | 1978-07-12 | Matsushita Electric Ind Co Ltd | Residencial central air conditioner |
-
1982
- 1982-06-22 JP JP10902282A patent/JPS58223983A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5377417A (en) * | 1976-12-21 | 1978-07-08 | Sony Corp | Pal-ntsc signal converter |
JPS5394123A (en) * | 1977-01-28 | 1978-08-17 | Akai Electric | Ntsc line sequential magnetic recorder*reproducer system |
JPS5650170U (en) * | 1979-09-25 | 1981-05-02 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0512861A2 (en) * | 1991-05-09 | 1992-11-11 | Nintendo Co. Limited | Color video signal standard conversion apparatus |
EP0512861A3 (en) * | 1991-05-09 | 1994-08-17 | Nintendo Co Ltd | Color video signal standard conversion apparatus |
CN1038464C (en) * | 1991-05-09 | 1998-05-20 | 任天堂株式会社 | Color video signal conversion apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPH0145799B2 (en) | 1989-10-04 |
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