JPS6058637B2 - Automatic saturation control circuit - Google Patents
Automatic saturation control circuitInfo
- Publication number
- JPS6058637B2 JPS6058637B2 JP9280577A JP9280577A JPS6058637B2 JP S6058637 B2 JPS6058637 B2 JP S6058637B2 JP 9280577 A JP9280577 A JP 9280577A JP 9280577 A JP9280577 A JP 9280577A JP S6058637 B2 JPS6058637 B2 JP S6058637B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- color signal
- saturation control
- control circuit
- emitter
- 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
- Processing Of Color Television Signals (AREA)
Description
【発明の詳細な説明】
本発明はカラーテレビジョン受像機の自動飽和度制御回
路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic saturation control circuit for a color television receiver.
カラーテレビジョン受像機に付加される機能の1つとし
て自動飽和度制御回路がある。One of the functions added to color television receivers is an automatic saturation control circuit.
これは伝送系等で信号が乱され、色信号が必要以上に大
きく再現されることがあるためである。この回路の例を
第1図および第2図に示す、第1図のブロック図を簡単
に説明すると、色信号が入力端子1から一段目の色信号
増幅回路2に入り、更に2段目の色信号増幅回路3に入
る。2段目増幅回路3のゲインは一般に知られている飽
和度制御可変抵抗4による飽和度制御て好みの飽和度に
選ばれる。This is because the signal may be disturbed in the transmission system, etc., and the color signal may be reproduced larger than necessary. Examples of this circuit are shown in FIGS. 1 and 2. To briefly explain the block diagram in FIG. It enters the color signal amplification circuit 3. The gain of the second stage amplifier circuit 3 is selected to a desired degree of saturation through saturation control using a generally known saturation control variable resistor 4.
1段目の増幅回路2の出力信号はコンデンサCを介して
ゲインコントロール回路5にフイードバツクされる。The output signal of the first stage amplifier circuit 2 is fed back to the gain control circuit 5 via the capacitor C.
この回路5では、前記出力信号の振幅を検出し、あるレ
ベルを越すとスイッチングするトランジスタを通じてあ
る時間ホールドするようにし、その電圧で1段目の増幅
回路2のゲインをコントロールする。第2図のブロック
図も同様なシステムであるが、フィードバックループが
複雑になつている。すなわち1段目の増幅回路2の色信
号出力をダイオード等よりなるピーク検波回路6でピー
ク検波し、更にその出力を微分回路7で微分し、この微
分信号をゲインコントロール回路5に加える。このシス
テムは、多種の色信号パターンが放送される場合には、
飽和度を一定にコントロールする面からは良いが、やや
複雑な回路となる。またこれらの回路は視聴者の好み等
により決定的な優劣をつけにくい。本発明は設計の容易
さを考慮し、集積化可能な自動飽和度制御装置を提供す
るものてある。This circuit 5 detects the amplitude of the output signal, holds it for a certain time through a transistor that switches when it exceeds a certain level, and controls the gain of the first stage amplifier circuit 2 using the detected voltage. The block diagram in FIG. 2 shows a similar system, but with a more complex feedback loop. That is, the color signal output of the first stage amplifier circuit 2 is peak-detected by a peak detection circuit 6 made of a diode or the like, the output is further differentiated by a differentiation circuit 7, and this differentiated signal is applied to the gain control circuit 5. This system can be used when various color signal patterns are broadcast.
Although this is good in terms of controlling the saturation level at a constant level, it is a rather complicated circuit. Furthermore, it is difficult to determine the superiority or inferiority of these circuits depending on the viewer's preferences. The present invention takes into account ease of design and provides an automatic saturation control device that can be integrated.
以下本発明の一実施例を図面に基づいて説明する。第3
図において、入力端子から入力された色信号は色信号増
幅回路2を通り色信号増幅バーストブランキング回路8
に入力される。ここで色信号はバースト信号を抜き取ら
れ、バースト信号を含まない色信号がトランジスタQ、
のベースに供給される。トランジスタQ、のエミッタは
ICの外に接続されている抵初只、でエミッタホロワ−
となつている。コンデンサClは検波用、コンデンサC
2はカップリング用および微分用、抵抗Ra)R4はバ
イアス用で、微分用のインピーダンスを抵拍只2と共に
つくつている。このとき、ピーク検波した信号は、コン
デンサC2を介して、抵抗R1を外付けするための端子
とは異なる端子より集積回路内に入力し、トランジスタ
Q2のベースに加えるようにしている。トランジスタQ
2はスイッチング用であり、大きな信号がベースに入る
と導通する。またトランジスタQ2のコレクタに接続さ
れる負荷抵抗はR5と飽和度制御可変抵抗のR6からな
り、高抵抗である。またコンデンサC3は出力電圧のホ
ールド用である。またトランジスタQ2のコレクタは色
信号増幅回路1のゲインコントロール端子に接続される
。9は1Cに組み込まれる部分を示す。An embodiment of the present invention will be described below based on the drawings. Third
In the figure, the color signal input from the input terminal passes through the color signal amplification circuit 2 and the color signal amplification burst blanking circuit 8.
is input. Here, the burst signal is extracted from the color signal, and the color signal that does not include the burst signal is transferred to the transistor Q.
supplied to the base of The emitter of transistor Q is a resistor connected outside the IC and is an emitter follower.
It is becoming. Capacitor Cl is for detection, capacitor C
2 is for coupling and differentiation, and resistor Ra) R4 is for bias, creating an impedance for differentiation together with resistor 2. At this time, the peak-detected signal is input into the integrated circuit via a capacitor C2 from a terminal different from the terminal for externally connecting the resistor R1, and is applied to the base of the transistor Q2. transistor Q
2 is for switching, and becomes conductive when a large signal enters the base. The load resistor connected to the collector of the transistor Q2 is composed of R5 and a saturation control variable resistor R6, and has a high resistance. Further, the capacitor C3 is for holding the output voltage. Further, the collector of the transistor Q2 is connected to the gain control terminal of the color signal amplification circuit 1. 9 indicates a portion to be incorporated into 1C.
なおこの色信号増幅回路1では電圧が下がると、ゲイン
が落ちるように構成されている。以上本発明によれば、
集積化が容易であり、飽和度の制御部の設計も容易かつ
自由にできる利点を有する。Note that this color signal amplification circuit 1 is configured such that the gain decreases when the voltage decreases. According to the present invention,
It has the advantage that integration is easy and the saturation control section can be easily and freely designed.
またパースト信号と色信号と振幅関係が異常な場合でも
過飽和になることを防ぐことが出来る(パースト信号が
色信号に対して小さな振幅のものが入力されると、前段
のACC回路はパースト信号を一定振幅に保とうと働く
為、結果的に色信号は過飽和の状態になる。)また外付
けの抵抗とコンデンサーとにより、コントロール特性を
決定することが可能であり、設計が容易であると共に外
付け部品が少なくてすむ。It is also possible to prevent oversaturation even if the amplitude relationship between the burst signal and the color signal is abnormal (if the burst signal is input with a smaller amplitude than the color signal, the ACC circuit in the previous stage (As the color signal tries to maintain a constant amplitude, the color signal becomes oversaturated.) Also, the control characteristics can be determined using external resistors and capacitors, which makes the design easy and allows external Fewer parts required.
第1図は従来の自動飽和度制御回路のブロック図、第2
図は従来の他のブロック図、第3図は本発明の一実施例
を示す要部回路図である。
2・・・色信号増幅回路、5・・・ゲインコントロール
回路、6・・ゼーク検波回路、8・・・色信号増幅パー
ストブランキング回路、9・・・ICに組み込まれる部
分、R1・・4Cに外付けされたエミッタ抵抗、R6・
・・飽和度制御可変抵抗。Figure 1 is a block diagram of a conventional automatic saturation control circuit, and Figure 2 is a block diagram of a conventional automatic saturation control circuit.
The figure is a block diagram of another conventional device, and FIG. 3 is a circuit diagram of a main part showing an embodiment of the present invention. 2... Color signal amplification circuit, 5... Gain control circuit, 6... Zeke detection circuit, 8... Color signal amplification burst blanking circuit, 9... Part incorporated in IC, R1... 4C Emitter resistor externally connected to R6・
... Saturation control variable resistance.
Claims (1)
、その振幅を検出して色信号増幅回路のゲインを制御す
る手段を具備した自動飽和度制御回路において、色信号
をピーク検波する手段を、エミッタ抵抗を集積回路の外
付けにしたエミッタホロワー型のエミッターピーク検波
回路で構成し、このエミッターピーク検波回路の出力を
前記エミッタ抵抗を外付けするための端子とは異なる端
子より前記集積回路内に入力し処理して前記色信号増幅
回路のゲインを制御する制御信号を得る構成とした自動
飽和度制御回路。1. In an automatic saturation control circuit equipped with means for peak-detecting the color signal of a color television receiver, detecting its amplitude, and controlling the gain of the color signal amplification circuit, the means for peak-detecting the color signal is installed at the emitter. It consists of an emitter follower type emitter peak detection circuit in which a resistor is externally connected to the integrated circuit, and the output of this emitter peak detection circuit is input into the integrated circuit from a terminal different from the terminal for externally connecting the emitter resistor. An automatic saturation control circuit configured to input and process a control signal for controlling the gain of the color signal amplification circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9280577A JPS6058637B2 (en) | 1977-08-01 | 1977-08-01 | Automatic saturation control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9280577A JPS6058637B2 (en) | 1977-08-01 | 1977-08-01 | Automatic saturation control circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5427319A JPS5427319A (en) | 1979-03-01 |
JPS6058637B2 true JPS6058637B2 (en) | 1985-12-20 |
Family
ID=14064617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9280577A Expired JPS6058637B2 (en) | 1977-08-01 | 1977-08-01 | Automatic saturation control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6058637B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0424319A (en) * | 1990-05-18 | 1992-01-28 | Soowa Sangyo:Yugen | Drilling auger for soil cement column |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3440806A1 (en) * | 1984-11-08 | 1986-05-15 | Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen | CIRCUIT ARRANGEMENT FOR COLOR TELEVISION RECEIVER FOR ADJUSTING THE CONTRAST AND COLOR |
-
1977
- 1977-08-01 JP JP9280577A patent/JPS6058637B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0424319A (en) * | 1990-05-18 | 1992-01-28 | Soowa Sangyo:Yugen | Drilling auger for soil cement column |
Also Published As
Publication number | Publication date |
---|---|
JPS5427319A (en) | 1979-03-01 |
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