JPS602715Y2 - Image quality switching device - Google Patents
Image quality switching deviceInfo
- Publication number
- JPS602715Y2 JPS602715Y2 JP13429379U JP13429379U JPS602715Y2 JP S602715 Y2 JPS602715 Y2 JP S602715Y2 JP 13429379 U JP13429379 U JP 13429379U JP 13429379 U JP13429379 U JP 13429379U JP S602715 Y2 JPS602715 Y2 JP S602715Y2
- Authority
- JP
- Japan
- Prior art keywords
- image quality
- circuit
- secam
- control signal
- received
- 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
Landscapes
- Color Television Systems (AREA)
Description
【考案の詳細な説明】
本案はPAL方式およ5’SECAM方式のいずれのカ
ラーテレビジョン信号をも受信することのできるカラー
テレビジョン受像機の画質切換装置に関するものである
。[Detailed Description of the Invention] The present invention relates to an image quality switching device for a color television receiver that can receive color television signals of either the PAL system or the 5'SECAM system.
カラーテレビジョンの放送にはPAL 方式、SECA
M方式があるが、世界にはこれらの両方式を受信できる
地域もある。PAL system and SECA are used for color television broadcasting.
There is M system, but there are some areas in the world where both of these systems can be received.
したがって、そのような地域では両方式を受信できるカ
ラーテレビジョン受像機が用いられ、カラー回路が受信
中の放送の方式によって対応する回路に自動的に切換わ
るようになっている。Therefore, in such areas, color television receivers that can receive both broadcasting systems are used, and the color circuit is automatically switched to the corresponding circuit depending on the broadcasting system being received.
ところが輝度情報を処理する映像系では同一の回路を通
して信号が得られるようになっているので画質を決定す
る条件は変更できない。However, in a video system that processes luminance information, the signals are obtained through the same circuit, so the conditions that determine image quality cannot be changed.
実際には、PAL方式の信号を受信している時に鮮鋭度
を高めた状態に画質を調整し、そのままの状態でSEC
AM方式の放送を受信すると画面上にカラーブラインド
またはドツト状のノイズが現われ好ましくなかった。In reality, when receiving a PAL signal, the image quality is adjusted to increase the sharpness, and then SEC
When receiving AM broadcasting, color blinding or dot-like noise appeared on the screen, which was undesirable.
これは輝度信号の高域成分を強調するとSECAM方式
の色信号における高域成分が輝度信号に重畳されること
によって起るものと考えられる。This is thought to occur because when the high-frequency component of the luminance signal is emphasized, the high-frequency component of the SECAM color signal is superimposed on the luminance signal.
したがって、従来はSECAM方式の放送に合せてノイ
ズが出ないように鮮鋭度を設定し、PAL方式の放送の
画質については鮮鋭度をある程度犠牲にしてきた。Therefore, conventionally, the sharpness has been set in accordance with SECAM broadcasting so as not to generate noise, and the image quality of PAL broadcasting has been sacrificed to some extent.
本案は以上のような問題点に着目して提案されたもので
、PAL方式およびSECAM方式のいずれの放送に対
しても画質を損うことなく自動的に調整できるようにす
る回路配置を与えるものである。This project was proposed focusing on the above-mentioned problems, and provides a circuit layout that allows automatic adjustment for both PAL and SECAM broadcasting without degrading image quality. It is.
本案を以下実施例について図面に従って説明する。The present invention will be described below with reference to the drawings.
第1図は本案を適用したPAL方式およびSECAM方
式のカラーテレビジョン信号を受信する受像機の部分的
な回路構成を示すブロック回路図である。FIG. 1 is a block circuit diagram showing a partial circuit configuration of a receiver that receives PAL and SECAM color television signals to which the present invention is applied.
1は前段の映像中間周波増幅回路から得られる信号が印
加される入力端子で、2は映像検波段である。Reference numeral 1 designates an input terminal to which a signal obtained from the video intermediate frequency amplification circuit at the previous stage is applied, and 2 designates a video detection stage.
映像検波段2の出力複合映像信号は映像増幅回路3、S
ECAM復調回路、PALa調回路に加えられる。The output composite video signal of the video detection stage 2 is sent to the video amplification circuit 3, S.
Added to ECAM demodulation circuit and PALa modulation circuit.
映像増幅回路3から得られる映像信号すなわち輝度成分
が映像出力回路4に与えられる。A video signal, ie, a luminance component, obtained from the video amplification circuit 3 is given to a video output circuit 4.
カラー放送がPAL方式の場合、PAL復調回路5によ
って色差信号B−Y、R−Yが取出されPAL/SEC
AM切換回路7に加えられる。When color broadcasting is in the PAL system, the PAL demodulation circuit 5 extracts color difference signals B-Y and R-Y and converts them to PAL/SEC.
It is added to the AM switching circuit 7.
またカラー放送がSECAM方式の場合、SECAM復
調回路6によって色差信号B−Y、R−Yが取出され回
路7に与えられる。Further, when color broadcasting is based on the SECAM system, the color difference signals B-Y and R-Y are taken out by the SECAM demodulation circuit 6 and given to the circuit 7.
PAL/SECAM切換回路7には、どの方式の放送を
受信しているかを識別する信号が制御信号として印加さ
れ、受信中の方式の入力の色差信号を切換えて次段の増
幅及びG−Y復調回路8に送出している。A signal identifying which broadcasting system is being received is applied as a control signal to the PAL/SECAM switching circuit 7, which switches the input color difference signal of the receiving system and performs the next stage amplification and G-Y demodulation. It is sent to circuit 8.
この制御信号には、例えばSECAM復調回路6内に備
えられているカラーキラー回路61のキラー出力が用い
られる。For this control signal, for example, the killer output of a color killer circuit 61 provided in the SECAM demodulation circuit 6 is used.
回路8の出力として得られる各色差信号B−Y、G−Y
、R−Yは映像出力回路4に加えられ、輝度成分Yが取
除かれ、色信号B、 G、 Rとなって陰極線管9に印
加される。Each color difference signal B-Y, G-Y obtained as the output of the circuit 8
, RY are applied to the video output circuit 4, the luminance component Y is removed, and the color signals B, G, R are applied to the cathode ray tube 9.
ここで、映像増幅回路3には一般に画質調整回路31が
備えられているが、本案ではこの回路に制御信号を加え
て放送方式に応じて画質調整値を切換えるようにしたも
のである。Here, the video amplifying circuit 3 is generally equipped with an image quality adjustment circuit 31, but in the present invention, a control signal is added to this circuit to switch the image quality adjustment value according to the broadcasting system.
そのための制御信号には、例えば前述したSECAM復
調回路6のカラーキラー出力が用いられる。As a control signal for this purpose, for example, the color killer output of the SECAM demodulation circuit 6 mentioned above is used.
第2図は、第1図の画質調整回路31の実際の回路結線
図を示す。FIG. 2 shows an actual circuit connection diagram of the image quality adjustment circuit 31 shown in FIG.
Qlは映像増幅用のトランジスタで、そのコレクタから
取出される信号はバッファ増幅用のトランジスタQ2の
ベースに与えられる。Ql is a transistor for video amplification, and a signal taken out from its collector is applied to the base of a transistor Q2 for buffer amplification.
トランジスタQ2のエミッタから得られる信号からエミ
ッタに接続された回路によって高域成分だけが取出され
、前述の映像増幅用のトラン。Only the high-frequency components are extracted from the signal obtained from the emitter of the transistor Q2 by a circuit connected to the emitter, and the above-mentioned transformer for video amplification is obtained.
ジスタQ1のエミッタから得られる信号に重畳される。It is superimposed on the signal obtained from the emitter of transistor Q1.
高域補償された信号は出力端子T3より送出される。The high frequency compensated signal is sent out from the output terminal T3.
可変抵抗器VR□は負帰還量を調整して鮮鋭度を設定す
るためのものである。The variable resistor VR□ is used to adjust the amount of negative feedback and set the sharpness.
Q3はスイッチングトランジスタで、そのベースには制
御信【号が印加され、コレクタ・エミツタ路には抵抗R
8が直列接続される。Q3 is a switching transistor, a control signal is applied to its base, and a resistor R is connected to its collector-emitter path.
8 are connected in series.
この直列接続は可変抵抗器VR□に並列に接続される。This series connection is connected in parallel to the variable resistor VR□.
第2図の回路配置において、端子T2に加えられる制御
信号がFAI、方式の放送を受信しているとき十分に低
い電圧を示し、トランジスタQは1非導通となる。In the circuit arrangement of FIG. 2, the control signal applied to the terminal T2 exhibits a sufficiently low voltage when FAI broadcasting is being received, and the transistor Q becomes non-conducting.
したがって、可変抵抗器VR1で設定した状態で高域成
分が強張され鮮鋭度を高めることができる。Therefore, the high frequency components are strengthened in the state set by the variable resistor VR1, and the sharpness can be enhanced.
次に、SECAM方式の放送を受信すると制御信号は高
い電圧値となり、トランジスタQ3を導通にする。Next, when a SECAM system broadcast is received, the control signal becomes a high voltage value, making the transistor Q3 conductive.
すると、抵抗B8が可変抵抗−器VR□に並に接続され
、負帰還量をPAL方式の受信時に対応させて減少させ
るよう切換える。Then, the resistor B8 is connected in parallel to the variable resistor VR□, and the amount of negative feedback is switched to be reduced in accordance with the PAL system reception.
このときの帰還量が画面に影響を与えないように抵抗R
8の値を予め設定しておけばよい。To prevent the amount of feedback at this time from affecting the screen, resistor R
A value of 8 may be set in advance.
そのため抵抗R8は可変抵抗器であってもよい。Therefore, the resistor R8 may be a variable resistor.
1 本案は以上のようにPAL方式の放送を受信してい
るときの方がSECAM方式のときよりも高域成分を高
めるように、両者間の受信状態に応じて自動的に画質調
整量を切換えるようにしたものであり、方式に応じた画
質の改善を計ることができるものである。1 As described above, this proposal automatically switches the amount of image quality adjustment according to the reception conditions between the two so that when receiving PAL broadcasting, the high frequency components are higher than when receiving SECAM broadcasting. This makes it possible to improve the image quality depending on the method.
′なお前述の実施例においては、制御信号として
SECAM復調回路復調回路−キラー出力を用いたが、
代りにFAI、復調回路側のカラーキラー出力を用いて
も同様に行なえる。'In the above embodiment, the SECAM demodulation circuit demodulation circuit-killer output was used as the control signal, but
The same effect can be achieved by using FAI and the color killer output from the demodulation circuit instead.
すなわち、制御信号としてはSECAM方式かPAL方
式であるかを識別できる信号であればよいわけで、カラ
ーキラー出力に限られるものではない。That is, the control signal may be any signal that can identify whether the system is SECAM or PAL, and is not limited to color killer output.
また、制御される画質調整回路は、PAL方式のとき高
域成分を高めるように動作し、SECAM方式のとき緩
和されるように切換えられればよく、第2図の回路結線
に限られるものではない。Furthermore, the controlled image quality adjustment circuit is not limited to the circuit connection shown in Fig. 2, as long as it operates to enhance the high-frequency components when using the PAL system, and to reduce the high-frequency components when using the SECAM system. .
第1図は本案の実施例を適用したFAI、方式およびS
ECAM方式のカラーテレビジョン信号を受信する受像
機の部分的なブロック回路図、第2図は本案の実施例に
係る画質調整回路の回路結線図である。
31・・・・・・画質調整回路、61・・・・・・制御
信号を取出すカラーキラー回路、Q3・・・・・・スイ
ッチングトランジスタ、VRl・・・・・・画質設定用
の可変抵抗器、R8・・・・・・コレクタ・エミツタ路
に直列接続された抵抗。Figure 1 shows the FAI, method, and S
FIG. 2 is a partial block circuit diagram of a receiver that receives an ECAM color television signal. FIG. 2 is a circuit connection diagram of an image quality adjustment circuit according to an embodiment of the present invention. 31...Picture quality adjustment circuit, 61...Color killer circuit for extracting control signals, Q3...Switching transistor, VRl...Variable resistor for image quality setting , R8...Resistor connected in series to the collector-emitter path.
Claims (2)
のカラーテレビジョン信号をも受信することのできるカ
ラーテレビジョン受像機において、受信している信号が
前記両方式のうちのどの方式を受信しているか識別する
制御信号を取出す回路と、この制御信号に応答してSE
CAM方式の放送を受信しているときよりもPAL方式
の放送を受信しているときの方が映像信号の高域成分を
高めるように動作する画質調整回路とを備えたことを特
徴とする画質切換装置。(1) In a color television receiver that can receive color television signals of either FAI, SECAM or SECAM format, it is possible to identify which of the above two formats the signal being received is being received. a circuit for extracting a control signal to
An image quality adjustment circuit that operates to enhance high-frequency components of a video signal when receiving PAL broadcasting than when receiving CAM broadcasting. Switching device.
ミツタ路に抵抗が直列接続されたスイッチングトランジ
スタを有し、画質調整回路の画質設定用の可変抵抗器と
並列に前記抵抗とコレクタ・エミツタ路の直列接続が接
続され、前記スイッチングトランジスタは前記制御信号
がSECAM方式の放送を受信していることを示すとき
導通となり、前記制御信号がPAL方式の放送を受信し
ていることを示すとき非導通となることを特徴とする実
用新案登録請求の範囲第1項記載の画質切換装置。(2) A switching transistor has a switching transistor to which a control signal is applied to the base and a resistor is connected in series to the collector-emitter path, and the resistor and the collector-emitter path are connected in parallel to a variable resistor for setting the image quality of the image quality adjustment circuit. A series connection is connected, and the switching transistor is conductive when the control signal indicates that a SECAM broadcast is being received, and is non-conductive when the control signal indicates that a PAL broadcast is being received. An image quality switching device according to claim 1, characterized in that:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13429379U JPS602715Y2 (en) | 1979-09-28 | 1979-09-28 | Image quality switching device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13429379U JPS602715Y2 (en) | 1979-09-28 | 1979-09-28 | Image quality switching device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5652374U JPS5652374U (en) | 1981-05-08 |
JPS602715Y2 true JPS602715Y2 (en) | 1985-01-25 |
Family
ID=29365864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13429379U Expired JPS602715Y2 (en) | 1979-09-28 | 1979-09-28 | Image quality switching device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS602715Y2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0514617Y2 (en) * | 1986-02-27 | 1993-04-19 | ||
JP2847754B2 (en) * | 1989-05-29 | 1999-01-20 | ソニー株式会社 | Television receiver |
JPH03120761U (en) * | 1990-03-22 | 1991-12-11 |
-
1979
- 1979-09-28 JP JP13429379U patent/JPS602715Y2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5652374U (en) | 1981-05-08 |
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