JPS60224382A - Television receiver - Google Patents

Television receiver

Info

Publication number
JPS60224382A
JPS60224382A JP8228084A JP8228084A JPS60224382A JP S60224382 A JPS60224382 A JP S60224382A JP 8228084 A JP8228084 A JP 8228084A JP 8228084 A JP8228084 A JP 8228084A JP S60224382 A JPS60224382 A JP S60224382A
Authority
JP
Japan
Prior art keywords
polarity
terminal
output
circuit
color television
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
Application number
JP8228084A
Other languages
Japanese (ja)
Inventor
Makoto Fukuhara
誠 福原
Norio Abe
安部 紀夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8228084A priority Critical patent/JPS60224382A/en
Publication of JPS60224382A publication Critical patent/JPS60224382A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To enable to receive broadcast of positive modulation and negative modulation by automatic switching and simplify operation by providing a polarity inversion circuit and as FF circuit. CONSTITUTION:When a color television signal of negative polarity is outputted to an output terminal 2 when receiving broadcast of positive modulation, voltage is applied to a control terminal 3. Output of the FF circuit 8 is inverted only when a polarity discriminating circuit 7 discriminates output of the terminal 2 is negative polarity, and voltage of the terminal 3 is eliminated and a color television signal of positive polarity is outputted to the terminal 2. When the receiver is made to receive broadcast of negative modulation, as voltage is not impressed to the terminal 3, a color television signal of negative polarity is outputted, and output of the circuit 8 is inverted. Consequently, voltage is impressed to the terminal 3, and color television of positive polarity is outputted to the terminal 2.

Description

【発明の詳細な説明】 [発明の技術分野] この発明は、−テレビジョン受信機に関し、詳しくは放
送方式を自動判別するように改良されたテレビジョン受
信機に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a television receiver, and more particularly to a television receiver improved to automatically determine a broadcast system.

[従来技術] 従来のテレビジョン受信機は、たとえば第1図に示すよ
うに構成されている。図において、(1)は映像中間周
波IC1(2)は映像中間周波IC(1)の検波出力で
あるカラーテレビ信号の出力端子、(3)は出力端子(
2)の極性を制御する制御端子、(4)は手動スイッチ
、(5)は直流電源、(6)はカラーテレビ信号を処理
する映像処理回路である。
[Prior Art] A conventional television receiver is configured as shown in FIG. 1, for example. In the figure, (1) is a video intermediate frequency IC1 (2) is an output terminal for a color television signal which is the detection output of video intermediate frequency IC (1), and (3) is an output terminal (
2) is a control terminal for controlling the polarity, (4) is a manual switch, (5) is a DC power supply, and (6) is a video processing circuit that processes color television signals.

つぎに、動作について説明する。映像中間周波IC(1
)は、制御端子(3)に電圧が加えられている場合には
、映像中間周波信号が正変調されている放送を受信した
とき、出力端子(2)には負極性のカラーテレビ信号が
、また、映像中間周波信号か負変調されている放送を受
信したとき、出力端子(2)には正極性のカラーテレビ
信号がそれぞれ出力される。
Next, the operation will be explained. Video intermediate frequency IC (1
), when a voltage is applied to the control terminal (3) and a broadcast in which the video intermediate frequency signal is positively modulated is received, a negative polarity color television signal is output to the output terminal (2). Further, when receiving a broadcast in which the video intermediate frequency signal is negatively modulated, a positive polarity color television signal is outputted to the output terminal (2).

他方、制御端子(3)が接地もしくは開放されている場
合には、映像中間周波信号が正変調されている放送を受
信したとき、出力端子(2)には正極性のカラーテレビ
信号が、また、映像中間周波信号が負変調されている放
送を受信したとき、出力端子(2)には負極性のカラー
テレビ信号がそれぞれ出力2れる構−成1 @ j (
′’ 4・したがって、映像処理回路(6)に正極性の
カラーテレビ信号を供給するために、正変調の放送を受
信するとき、制御端子(3)を接地し、負変調の放送を
受信するとき、制御端子(3)に電圧を加えるようにス
イッチ(4)を手動で切換えていた。
On the other hand, when the control terminal (3) is grounded or open, when a broadcast in which the video intermediate frequency signal is positively modulated is received, the output terminal (2) receives a positive polarity color television signal, and , when a broadcast in which the video intermediate frequency signal is negatively modulated is received, two negative polarity color television signals are output to the output terminal (2).Configuration 1 @ j (
'' 4. Therefore, in order to supply a positive polarity color television signal to the video processing circuit (6), when receiving a positive modulation broadcast, the control terminal (3) is grounded and a negative modulation broadcast is received. At that time, the switch (4) was manually switched to apply voltage to the control terminal (3).

このため、従来のテレビジョン受信機では、正変調と負
変調の放送が両方受信できる地域において、受信する放
送の放送方式に合わせて手動スイッチ(4)を切換えな
ければならないという欠点があった。
For this reason, conventional television receivers have a disadvantage in that in areas where both positive modulation and negative modulation broadcasts can be received, the manual switch (4) must be changed according to the broadcasting system of the broadcast to be received.

[発明の概要コ この発明は上記のような従来のものの欠点を除去するた
めになされたもので、従来の手動スイッチに代えて極性
判別回路とフリップフロップ回路とを設けることにより
、正変調、負変調−の放送を自動的に判別できるテレビ
ジョン受信機を提供することを目的としている。
[Summary of the Invention] This invention was made to eliminate the drawbacks of the conventional ones as described above, and by providing a polarity discrimination circuit and a flip-flop circuit in place of the conventional manual switch, positive modulation and negative modulation can be achieved. An object of the present invention is to provide a television receiver that can automatically discriminate between modulated broadcasts.

〔発明の実施例] 以下、この発明の実施例を図面にしたがって説明する。[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

第2図はこの発明によるテレビジョン受信機の実施例を
示すブロック図である。図において、(1)は映像中間
周波IC1(2)は映像中間周波IC(1)の検波出力
であるカラーテレビ信号の出力端子、(3)は出力端子
(2)の極性を制御する制御端子、(6)はカラーテレ
ビ信号を処理する映像処理回路、げ)はカラーテレビ信
号の極性を判別する極性判別回路、(8)はフリップフ
ロップ回路で、フリップフロップ回路(8)の出力は制
御端子(3)に接続されている。
FIG. 2 is a block diagram showing an embodiment of a television receiver according to the present invention. In the figure, (1) is a video intermediate frequency IC1 (2) is an output terminal for a color television signal which is the detection output of video intermediate frequency IC (1), and (3) is a control terminal that controls the polarity of the output terminal (2). , (6) is a video processing circuit that processes a color television signal, (g) is a polarity discrimination circuit that determines the polarity of a color television signal, (8) is a flip-flop circuit, and the output of the flip-flop circuit (8) is a control terminal. (3).

つぎに、動作について説明する。Next, the operation will be explained.

いま、正変調の放送を受信しているとき、出力端子(2
)に負極性のカラーテレビ信号が出力されたとすると、
制御端子(3)には電圧が加えられていることになる。
Now, when receiving a broadcast with positive modulation, the output terminal (2
), a negative polarity color television signal is output.
A voltage is applied to the control terminal (3).

極性判別回路(?)が出力端子(2)の出力を負極性で
あると判定したときのみ、フリップフロップ回路(8)
の出力が反転されるようにしてあり、フリップフロップ
回路(8)の出力が反転して制御端子(3)に電圧が印
加されなくなると、出力端子(2)には正極性のカラー
テレビ信号が出力され、映像処理回路(6)に供給され
る。
Only when the polarity determination circuit (?) determines that the output of the output terminal (2) has negative polarity, the flip-flop circuit (8)
When the output of the flip-flop circuit (8) is inverted and no voltage is applied to the control terminal (3), a positive color television signal is output to the output terminal (2). The signal is output and supplied to the video processing circuit (6).

このとき、極性判別回路(7)は出力端子(2)の出力
信号が正極性であると判定するが、フリップフロップ回
路(8)は動作せず、出力端子(2)には正極性のカラ
ーテレビ信号が出力され続ける。
At this time, the polarity determination circuit (7) determines that the output signal of the output terminal (2) is of positive polarity, but the flip-flop circuit (8) does not operate and the output terminal (2) has a positive polarity signal. TV signal continues to be output.

ここで、負変調の放送を受信するようにすると、制御端
子(3)には電圧が印加されていないので、出力端子(
2)には負極性のカラーテレビ信号が出力され、フリッ
プフロップ回路(8)の出力は反転する。その結果、制
御端子(3)に電圧が印加されるので、出力端子(2)
には正極性のカラーテレビ信号が出力され、以後、異な
る変調方式の放送を受信しないかぎり、この状態が持続
される。
Here, when receiving negative modulation broadcasting, no voltage is applied to the control terminal (3), so the output terminal (
2), a negative polarity color television signal is output, and the output of the flip-flop circuit (8) is inverted. As a result, voltage is applied to the control terminal (3), so the output terminal (2)
A color television signal of positive polarity is outputted to the terminal, and this state is maintained unless a broadcast with a different modulation method is received.

なお、上記実施例では、映像処理回路(6)が正極性の
カラーテレビ信号を必要とする場合について述べたが、
この発明は、映像処理回路(8)が負極性のカラーテレ
ビ信号を必要とする場合にも適用することが可能である
。この場合には、極性判別回路(7)が出力端子(2)
に出力されるカラーテレビ信号の極性を正極性と判別し
たときのみフリップフロップ回路(8)を反転させるよ
うにすればよい。
In addition, in the above embodiment, a case was described in which the video processing circuit (6) requires a positive polarity color television signal; however,
The present invention can also be applied to a case where the video processing circuit (8) requires a negative polarity color television signal. In this case, the polarity discrimination circuit (7) is connected to the output terminal (2).
It is only necessary to invert the flip-flop circuit (8) only when the polarity of the color television signal outputted to is determined to be positive polarity.

[発明の効果] 以上のように、この発明によれば、極性判別回路とフリ
ップフロップ回路とを設けることによって、正変調およ
び負変調の放送を自動的に切換えて受信することができ
るため、従来のようにスイッチを手動で切換える必要が
なく、操作がきわめて簡単なテレビジョン受信機を提供
することができる。
[Effects of the Invention] As described above, according to the present invention, by providing the polarity discrimination circuit and the flip-flop circuit, it is possible to automatically switch and receive broadcasts with positive modulation and negative modulation. It is possible to provide a television receiver that is extremely easy to operate without the need for manual switching.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は従来のテレビジョン受信機のブロック回路図、
第2図はこの発明によるテレビジョン受信機の実施例を
示すブロック回路図である6(1)・・・映像中間周波
IC1(2)・・・出力端子、(3)・・・制御端子、
(6)・・・映像処理回路、(7)・・・極性判別回路
、(8)・・・フリップフロップ回路。 なお1図中、同一符号は同一または相当部分を示す・ 代理人 大岩増雄 第1図 第2図
Figure 1 is a block circuit diagram of a conventional television receiver.
FIG. 2 is a block circuit diagram showing an embodiment of the television receiver according to the present invention. 6(1)...Video intermediate frequency IC1(2)...Output terminal, (3)...Control terminal,
(6)...Video processing circuit, (7)...Polarity discrimination circuit, (8)...Flip-flop circuit. In Figure 1, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] (1)正変調または負変調された映像中間周波信号を検
波し、この検波出力の極性を制御するための制御端子を
有する映像中間周波ICと、上記検波出力を処理する映
像処理回路と、上記検波出力の極性を判別する極性判別
回路と、この極性判別回路が正または負のいずれか一方
の極性を判別したときに反転動作するフリップフロップ
回路とを備え、上記フリップフロップ回路の出力を上記
映像中間周波ICの制御端子に接続したことを特徴とす
るテレビジョン受信機。
(1) a video intermediate frequency IC having a control terminal for detecting a positively modulated or negatively modulated video intermediate frequency signal and controlling the polarity of the detected output; a video processing circuit for processing the detected output; It is equipped with a polarity discrimination circuit that discriminates the polarity of the detection output, and a flip-flop circuit that performs an inverting operation when the polarity discrimination circuit discriminates either positive or negative polarity. A television receiver characterized in that it is connected to a control terminal of an intermediate frequency IC.
JP8228084A 1984-04-23 1984-04-23 Television receiver Pending JPS60224382A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8228084A JPS60224382A (en) 1984-04-23 1984-04-23 Television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8228084A JPS60224382A (en) 1984-04-23 1984-04-23 Television receiver

Publications (1)

Publication Number Publication Date
JPS60224382A true JPS60224382A (en) 1985-11-08

Family

ID=13770094

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8228084A Pending JPS60224382A (en) 1984-04-23 1984-04-23 Television receiver

Country Status (1)

Country Link
JP (1) JPS60224382A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0320641A2 (en) * 1987-12-15 1989-06-21 STMicroelectronics S.r.l. Device for automatically selecting the demodulation standard of a video signal, useful with an intermediate frequency demodulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0320641A2 (en) * 1987-12-15 1989-06-21 STMicroelectronics S.r.l. Device for automatically selecting the demodulation standard of a video signal, useful with an intermediate frequency demodulator

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