JPS6151832B2 - - Google Patents
Info
- Publication number
- JPS6151832B2 JPS6151832B2 JP55140747A JP14074780A JPS6151832B2 JP S6151832 B2 JPS6151832 B2 JP S6151832B2 JP 55140747 A JP55140747 A JP 55140747A JP 14074780 A JP14074780 A JP 14074780A JP S6151832 B2 JPS6151832 B2 JP S6151832B2
- Authority
- JP
- Japan
- Prior art keywords
- color
- color television
- circuit
- output
- switch
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 7
- 239000013078 crystal Substances 0.000 description 7
- 230000010355 oscillation Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/642—Multi-standard receivers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Description
【発明の詳細な説明】
この発明は色副搬送周波数の相異る二種類のカ
ラーテレビジヨン信号を受信することが可能なカ
ラーテレビジヨン受信機の改良に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a color television receiver capable of receiving two types of color television signals having different color subcarrier frequencies.
カラーテレビジヨン信号には二種類の色副搬送
周波数（例えば3.58MHzと4.43MHz）を有する
ものがあり、このようなカラーテレビジヨン信号
を受信する場合、二系統の色復調回路を用意して
おき、受信カラーテレビジヨン信号に応じてこれ
を切換えることが必要である。このとき機能的に
共通な回路をできる限り共用化し、必要最少限の
回路のみを切換えることは当然であろう。したが
つて、色復調を行うための局部発振器の発振周波
数と、色相調節回路の切換えを行うことによつ
て、それぞれのカラーテレビジヨン信号の復調が
可能である。 Some color television signals have two types of color subcarrier frequencies (for example, 3.58MHz and 4.43MHz), and when receiving such color television signals, two systems of color demodulation circuits must be prepared. , it is necessary to switch this depending on the received color television signal. At this time, it is natural to share functionally common circuits as much as possible and to switch only the minimum necessary circuits. Therefore, by switching the oscillation frequency of the local oscillator for performing color demodulation and the hue adjustment circuit, it is possible to demodulate each color television signal.
この発明は上述の必要な回路の切換過程におい
て、その切換状態が受信カラーテレビジヨン信号
にとつて正しい状態であるか否かを判別すること
により、正しい状態ならばこの状態を保持し、正
しくない状態ならばこの状態を修正するように
し、回路を著しく簡単にすることを目的とする。 In the process of switching the necessary circuits described above, this invention determines whether the switching state is correct for the received color television signal, and if the switching state is correct, it maintains this state, and if it is The purpose is to correct this condition and significantly simplify the circuit.
以下、図面を用いてこの発明を詳細に説明す
る。図において、１は複合カラーテレビジヨン信
号入力端で、例えば3.58MHzと4.43MHzのよう
に相異る色副搬送周波数をもつ二種類のカラーテ
レビジヨン信号が加えられる。２は複合カラーテ
レビジヨン信号から色副搬送周波を分離するバン
ドパスフイルタ、３はバンドパスアンプ、４はカ
ラーコントロールアンプ、５はカラーコントロー
ル電圧が印加される入力端子、６は復調回路で、
端子７，８にはそれぞれＲ―Ｙ及びＢ―Ｙの復調
出力が現われる。９はバーストゲート回路で、端
子１０にはバーストゲートパルス１１が加えられ
る。１２は自動周波数および位相制御回路（以下
AFPC回路と称す）、１３はAFPCフイルタ、１
４は局部発振回路である。１５，１６はそれぞれ
3.58MHzと4.43MHzの水晶振動子、１７は水晶
振動子１５，１６を選択的に捉えるためのスイツ
チである。１８は移相回路、１９はカラーキラー
検波回路で、通常白黒放送受信時等に出力を発生
してカラーコントロールアンプ４を制御する。２
０は色相調節回路であり、復調回路６に接続さ
れ、端子２１に印加される色相コントロール電圧
によつて色相が調節される。２２，２３はそれぞ
れ3.58MHzと4.43MHzに相当するサブ色相調節
回路であり、スイツチ２４によつて選択的に切換
えられる。このスイツチ２４及びスイツチ１７は
フリツプフロツプ２５によつて連動して切換えら
れる。２６はアンドゲートで、入力端子２７を介
して、例えば垂直同期信号等のフリツプフロツプ
トリガパルス２８とカラーキラー回路１９から得
られるカラーキラー電圧がそれぞれ入力されてい
る。 Hereinafter, this invention will be explained in detail using the drawings. In the figure, reference numeral 1 denotes a composite color television signal input terminal, to which two types of color television signals having different color subcarrier frequencies, such as 3.58MHz and 4.43MHz, are applied. 2 is a bandpass filter that separates the color subcarrier frequency from the composite color television signal; 3 is a bandpass amplifier; 4 is a color control amplifier; 5 is an input terminal to which a color control voltage is applied; 6 is a demodulation circuit;
Demodulated outputs of RY and BY appear at terminals 7 and 8, respectively. 9 is a burst gate circuit, and a burst gate pulse 11 is applied to a terminal 10. 12 is an automatic frequency and phase control circuit (hereinafter referred to as
(referred to as AFPC circuit), 13 is AFPC filter, 1
4 is a local oscillation circuit. 15 and 16 are respectively
3.58MHz and 4.43MHz crystal oscillators, 17 is a switch for selectively capturing the crystal oscillators 15 and 16. Reference numeral 18 indicates a phase shift circuit, and reference numeral 19 indicates a color killer detection circuit, which generates an output and controls the color control amplifier 4, usually when receiving monochrome broadcasting. 2
0 is a hue adjustment circuit, which is connected to the demodulation circuit 6 and whose hue is adjusted by a hue control voltage applied to a terminal 21. Sub-hue adjustment circuits 22 and 23 correspond to 3.58 MHz and 4.43 MHz, respectively, and are selectively switched by a switch 24. The switch 24 and the switch 17 are operated in conjunction with each other by a flip-flop 25. Reference numeral 26 denotes an AND gate, into which a flip-flop trigger pulse 28 such as a vertical synchronizing signal and a color killer voltage obtained from the color killer circuit 19 are respectively inputted via an input terminal 27 .
次に機能の詳細な説明をする。 Next, we will explain the functions in detail.
まず、端子１に3.58MHzのカラーテレビジヨ
ン信号が到来しているものとする。このとき、ス
イツチ１７，２４が図示の位置、すなわち
3.58MHzの水晶振動子及び3.58MHzのサブ色相
調節回路が接続された状態であるとすると、カラ
ーキラー検波回路の出力は低レベル（以下Ｌ、こ
の逆はＨと称す）となつており、アンドゲート２
６の出力は現われない。 First, assume that a 3.58MHz color television signal is arriving at terminal 1. At this time, the switches 17 and 24 are in the illustrated position, i.e.
Assuming that the 3.58MHz crystal oscillator and 3.58MHz sub-hue adjustment circuit are connected, the output of the color killer detection circuit is at a low level (hereinafter referred to as L, the reverse is referred to as H), and gate 2
6 output does not appear.
従つて、フリツプフロツプ２５の出力状態はそ
の状態を保持しており、3.58MHzのカラーテレ
ビジヨン信号の正しい復調状態となつている。 Therefore, the output state of the flip-flop 25 remains the same, and is in the correct demodulation state of the 3.58 MHz color television signal.
次にこの状態において、4.43MHzのカラーテ
レビジヨン信号を受信すると、水晶振動子１５が
3.58MHzの接続状態となつているため、AFPC回
路１２はロツクされず、カラーキラー検波回路１
９の出力２９はＨとなる。このため、アンドゲー
ト２６の出力にはフリツプフロツプトリガパルス
が生じ、フリツプフロツプ２５はこのトリガパル
ス２８を受けて、状態が変化することになる。従
つて、スイツチ１７，２４は図示の状態と反対と
なり、局部発振回路１４には4.43MHzの水晶振
動子が接続される。このためAFPC回路１２がロ
ツクされ、カラーキラー検波回路１９の出力はＬ
となる。従つて、アンドゲート２６に出力が現わ
れず、フリツプフロツプ２５はそのままの状態が
保持されて4.43MHzのカラーテレビジヨン信号
の正しい復調状態を維持することになる。 Next, in this state, when a 4.43MHz color television signal is received, the crystal oscillator 15
Since the 3.58MHz connection state is established, the AFPC circuit 12 is not locked and the color killer detection circuit 1
The output 29 of 9 becomes H. Therefore, a flip-flop trigger pulse is generated at the output of the AND gate 26, and the flip-flop 25 receives this trigger pulse 28 and changes its state. Therefore, the switches 17 and 24 are in the opposite state as shown, and a 4.43 MHz crystal resonator is connected to the local oscillation circuit 14. Therefore, the AFPC circuit 12 is locked, and the output of the color killer detection circuit 19 is L.
becomes. Therefore, no output appears at the AND gate 26, and the flip-flop 25 remains in its current state, maintaining the correct demodulation state of the 4.43 MHz color television signal.
このようにして、常に到来信号に対して正しい
復調状態を保持するように切換回路が自動的に切
換えられることになる。 In this way, the switching circuit is automatically switched so as to always maintain the correct demodulation state for the incoming signal.
なお、上述の実施例においては、アンドゲート
２６とフリツプフロツプ２５とによつて切換回路
１７，２４を制御するように構成したが、他の制
御回路によつても同様に実施することができる。
また、3.58MHzと4.43MHzの相異る二種類の色
副搬送周波数をもつNTSC方式について説明した
が、PAL方式についても同様の自動切換回路を
構成することが可能であり、さらに局部発振回路
にAFPC回路の組合せによる実施例でなく、リン
ギング方式あるいはインジエクシヨン方式の場合
においても、水晶振動子を切換えるようにして適
用することができる。 In the above embodiment, the switching circuits 17 and 24 are controlled by the AND gate 26 and the flip-flop 25, but the switching circuits 17 and 24 can be similarly implemented by other control circuits.
In addition, although we have explained the NTSC system, which has two different color subcarrier frequencies of 3.58MHz and 4.43MHz, it is also possible to configure a similar automatic switching circuit for the PAL system, and it is also possible to configure a local oscillator circuit. This embodiment is not limited to the combination of AFPC circuits, but can also be applied to a ringing method or an injection method by switching the crystal oscillator.
このように、この発明によれば、極めて簡単な
構成において色副搬送周波数の相異る二種類のカ
ラーテレビジヨン信号の色復調の自動切換が可能
となり、この発明の実用価値は大である。 As described above, according to the present invention, it is possible to automatically switch the color demodulation of two types of color television signals having different color subcarrier frequencies with an extremely simple configuration, and the practical value of the present invention is great.
図はこの発明の一実施例であるカラーテレビジ
ヨン受信機の要部を示すブロツクダイヤグラムで
ある。
図中、１は複合カラーテレビジヨン信号入力端
子、６は復調回路、９はバーストゲート回路、１
４は局部発振回路、１５，１６はそれぞれ水晶振
動子、１９はカラーキラー検波回路、１７，２４
はスイツチ、２５はフリツプフロツプ、２６はア
ンドゲート、２８はフリツプフロツプ、２６はア
ンドゲート、２８はフリツプフロツプトリガパル
スである。
The figure is a block diagram showing the main parts of a color television receiver which is an embodiment of the present invention. In the figure, 1 is a composite color television signal input terminal, 6 is a demodulation circuit, 9 is a burst gate circuit, 1
4 is a local oscillation circuit, 15 and 16 are crystal oscillators, 19 is a color killer detection circuit, 17 and 24
25 is a flip-flop, 26 is an AND gate, 28 is a flip-flop, 26 is an AND gate, and 28 is a flip-flop trigger pulse.
Claims (1)
レビジヨン信号を受信可能なカラーテレビジヨン
受信機において、受信されたカラーテレビジヨン
信号からその色副搬送周波数の信号を抽出するゲ
ート回路、上記各色副搬送周波数とそれぞれ同一
周波数の二種類の信号を発生する発振器、この発
振器の出力を選択的に切換えるスイツチ、上記ゲ
ート回路の出力と上記発振器の選択された出力と
の周波数一致状態を検出する検出手段、この検出
手段の出力により周波数一致が検出されたときは
上記スイツチの選択を保持し、周波数一致が検出
されないときは上記スイツチの選択を切換える制
御手段を備えたカラーテレビジヨン受信機。1. In a color television receiver capable of receiving two types of color television signals having different color subcarrier frequencies, a gate circuit for extracting a signal of the color subcarrier frequency from the received color television signal; An oscillator that generates two types of signals each having the same frequency as the carrier frequency, a switch that selectively switches the output of this oscillator, and a detection means that detects a frequency matching state between the output of the gate circuit and the selected output of the oscillator. , a color television receiver comprising control means for maintaining the selection of the switch when frequency matching is detected by the output of the detection means, and changing the selection of the switch when frequency matching is not detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14074780A JPS5765087A (en) | 1980-10-07 | 1980-10-07 | Color television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14074780A JPS5765087A (en) | 1980-10-07 | 1980-10-07 | Color television receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5765087A JPS5765087A (en) | 1982-04-20 |
| JPS6151832B2 true JPS6151832B2 (en) | 1986-11-11 |
Family
ID=15275782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14074780A Granted JPS5765087A (en) | 1980-10-07 | 1980-10-07 | Color television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5765087A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58152070U (en) * | 1982-04-07 | 1983-10-12 | シャープ株式会社 | Subcarrier automatic switching circuit |
| JPS595795A (en) * | 1982-06-30 | 1984-01-12 | Sharp Corp | Color killer circuit |
| JPS60189187U (en) * | 1984-05-23 | 1985-12-14 | シャープ株式会社 | Subcarrier automatic switching circuit |
| JPH0965343A (en) * | 1995-08-25 | 1997-03-07 | Sony Corp | Automatic discriminating device for broadcasting system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1138911A (en) * | 1965-05-21 | 1969-01-01 | Telefunken Patent | Improvements in or relating to colour television receivers |
| JPS5028941A (en) * | 1973-07-17 | 1975-03-24 | ||
| JPS5093728A (en) * | 1973-12-21 | 1975-07-26 |
-
1980
- 1980-10-07 JP JP14074780A patent/JPS5765087A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1138911A (en) * | 1965-05-21 | 1969-01-01 | Telefunken Patent | Improvements in or relating to colour television receivers |
| JPS5028941A (en) * | 1973-07-17 | 1975-03-24 | ||
| JPS5093728A (en) * | 1973-12-21 | 1975-07-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5765087A (en) | 1982-04-20 |
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