JPS58124386A - Frequency characteristic compensating device - Google Patents
Frequency characteristic compensating deviceInfo
- Publication number
- JPS58124386A JPS58124386A JP809682A JP809682A JPS58124386A JP S58124386 A JPS58124386 A JP S58124386A JP 809682 A JP809682 A JP 809682A JP 809682 A JP809682 A JP 809682A JP S58124386 A JPS58124386 A JP S58124386A
- Authority
- JP
- Japan
- Prior art keywords
- amplitude
- circuit
- color
- signal
- high frequency
- 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
Links
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
- H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
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に用いてカラーテ
レビジョン複合映像信号の高域成分を安定化する周波数
特性補償装置に関し、文字多重放送信号等の高域周波数
成分が含まれている場合にも安定にそれらの信号を受信
することのできる装置を提供しようとするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frequency characteristic compensation device for use in a color television receiver to stabilize the high frequency components of a color television composite video signal. The object of the present invention is to provide a device that can stably receive such signals even when such signals are included.
従来、カラーテレビジョン受像機においては、その信号
の伝送系途中における振幅ひずみゃ、受像機のアンテナ
系のミスマツチングおよびチューナの帯域特性の変化等
に起因する色副搬送波成分の駐幅変動による悪影響を防
雨するために、カラーバースト信号の眼幅全検出して、
そのカラーバースト信号の梧幅を一定に保つように制御
するとともに、色搬送波成分の振幅全安定化するように
していた。これは、一般に人ＱＣ回路と称されて公知で
ある。Conventionally, in color television receivers, the negative effects of parking width fluctuations of color subcarrier components caused by amplitude distortion in the signal transmission system, mismatching of the receiver's antenna system, and changes in tuner band characteristics have been avoided. To prevent rain, the color burst signal is detected at the full interpupillary distance,
The width of the color burst signal is controlled to be kept constant, and the amplitude of the color carrier wave component is completely stabilized. This is commonly known as a human QC circuit.
本発明ではこのカラーバースト信号が複合映像信号の高
域成分を代表することに着目し、カラーバースト信号の
振幅を検出して映像信号の高域成分を安定化しようとす
るものである。特に、文字多重放送信号のような比較的
高い周波数の成分がカラーテレビジョン複合映像信号中
に含まれている場合にこれを安定化し、より高性能な文
字多重放送受信等を実現するのに有効な装置全提供する
ものである。The present invention focuses on the fact that this color burst signal represents the high frequency component of the composite video signal, and attempts to stabilize the high frequency component of the video signal by detecting the amplitude of the color burst signal. It is particularly effective in stabilizing relatively high frequency components such as teletext signals when they are included in a color television composite video signal and achieving higher performance teletext reception, etc. We provide all necessary equipment.
以丁、本発明の一実施例について添付図面にもとづいて
説明する。第１図は本発明の一実施例の装置全備えたテ
レビジョン受像機のグロック図である。図中、１はチコ
、−す、２ばＶＩＦ増１隔および映像検波回路、３は周
波数特性補償回路、４は映像信号処理回路、５は色信号
帯域フィルタ、６はＡＣＣ回路である。周波数特性補償
回路３の出力は色信号帯域フィルタ６を介１〜でＡＣＣ
回路６へ供給され、ここでカラーバースト信号の振幅力
検出されてＡｃＣ制浦制圧電圧生さｉｔ、カラーバース
ト信号の振幅を一定にするように周波数特性補償回路３
ヘフイイードバツクされる。例えば、ＶＩＰ増幅および
映像信号検波回路２の出力のカラーテレビジョン複合映
像信号の高域特性が劣化［〜でいてカラーバースト信号
の振幅も小さくなっていれば、ＡＣＣ回路６で発生さ凡
るＡＣＣＣＣ制御上は周波数特性補償回路３においてそ
の高域成分全増加させるように制御動作をし、反対に高
域成分が過度になってカラーバースト信号の振幅が過大
になった場合にはそれを抑制するように制御動作をする
。An embodiment of the present invention will now be described based on the accompanying drawings. FIG. 1 is a block diagram of a television receiver fully equipped with an apparatus according to an embodiment of the present invention. In the figure, 1 is a filter, 2 is a VIF amplification interval and a video detection circuit, 3 is a frequency characteristic compensation circuit, 4 is a video signal processing circuit, 5 is a color signal band filter, and 6 is an ACC circuit. The output of the frequency characteristic compensation circuit 3 is passed through the color signal band filter 6 to ACC
It is supplied to the circuit 6, where the amplitude force of the color burst signal is detected and the AcC control voltage is generated, and the frequency characteristic compensation circuit 3 is applied to keep the amplitude of the color burst signal constant.
Heftyed is backed up. For example, if the high-frequency characteristics of the color television composite video signal output from the VIP amplification and video signal detection circuit 2 are degraded [...] and the amplitude of the color burst signal is also small, ACCCC will not occur in the ACC circuit 6. In terms of control, the frequency characteristic compensation circuit 3 performs a control operation to increase all of the high frequency components, and on the other hand, when the high frequency components become excessive and the amplitude of the color burst signal becomes excessive, it is suppressed. control operation.
第２図はその周波数特性補償回路３の一例を示す。その
補償部分についてさらに詳細（で説明する。FIG. 2 shows an example of the frequency characteristic compensation circuit 3. The compensation part will be explained in more detail below.
了は映像検波回路２からのカラーテレビジョン複合映像
信号の入力端子で、８はそのバッファアンプ用のトラン
ジスタであり、次段のトランジスタ９．１０で構成され
る漂動アンプの一方のｌ・ランジスタ９のベースへ接続
する。トランジスタ９゜１０のコレクタは共通に結合し
、そのコレクタにはコンデンサ１１とコイル１２を接続
し、さらにコイル１２の朗唱はトランジスタ８のエミッ
タに接続ｌ〜でいる。Terminal is an input terminal for the color television composite video signal from the video detection circuit 2, 8 is a transistor for its buffer amplifier, and transistor 9 is one transistor of the floating amplifier consisting of transistors 9 and 10 in the next stage. Connect to the base of 9. The collectors of the transistors 9 and 10 are connected in common, and a capacitor 11 and a coil 12 are connected to the collectors, and the coil 12 is connected to the emitter of the transistor 8.
トランジスタ８のエミッタには入力端子Ｔの人力信号が
その１寸あられれ、また、コンデンサ１１とコイル１２
との交点にはコンデンサ１１どコイル１２とで共振する
周波数をピークとする高域成分が出力されるとともにト
ランジスタ８のエミッタの出力信号がコイル１２を介し
て重畳されて出力されて、次段トランジスタ１３のベー
スへ供給される。その出力端子１４の出力信号はエミッ
タから、ひとつは第１図中の色信号帯域フィルタ５へ、
もうひとつはテイレーラインを介して映像信号処理回路
４へ供給される。The emitter of the transistor 8 receives a human input signal from the input terminal T, and also the capacitor 11 and the coil 12.
At the intersection with the capacitor 11 and the coil 12, a high-frequency component having a peak at a frequency that resonates with the coil 12 is output, and the output signal of the emitter of the transistor 8 is superimposed via the coil 12 and output, and is output to the next stage transistor. 13 bases. The output signal of the output terminal 14 is sent from the emitter, one goes to the color signal band filter 5 in FIG.
The other signal is supplied to the video signal processing circuit 4 via the Taylor line.
第２図の差動アンプのトランジスタ１００ベースにはＡ
ＣＣ回路６からの制御電圧が供給されており、カラーバ
ースト信号の振幅が犬きくなってこの電■が上昇すれば
、トランジスタ９のコレクタ電流は減少ｌ−、コンデン
サ１１からの出力となるカラー複合映像信号中の高域成
分は減少する。The base of the transistor 100 of the differential amplifier in Fig. 2 has an A
A control voltage is supplied from the CC circuit 6, and when the amplitude of the color burst signal becomes sharper and this voltage rises, the collector current of the transistor 9 decreases, and the color composite becomes the output from the capacitor 11. High frequency components in the video signal are reduced.
反対に、カラーバースト信号の振幅が小さくなって制御
電圧は下降すると、トランジスタ９のコレクタ電流が増
大し、コンデンサ１１からの高域成分の出力が増大する
。Conversely, when the amplitude of the color burst signal becomes smaller and the control voltage falls, the collector current of transistor 9 increases, and the output of the high frequency component from capacitor 11 increases.
このように、出力信号中のカラーバースト信号の振幅ｆ
ｋＧｃ回路６で検出して制御型「１三として周波数特性
補償回路３にフィードバックすれば、この制御型１Ｔｉ
Ｅによってに述したようにカラーテレビジョン複合映像
信号の高域成分全安定化することができる。In this way, the amplitude f of the color burst signal in the output signal
If detected by the kGc circuit 6 and fed back to the frequency characteristic compensation circuit 3 as the control type 1Ti, this control type 1Ti
As described above, the high frequency components of a color television composite video signal can be completely stabilized by E.
そして第２図中のコンデンサ１１とコイル１２との共振
周波数を第３図のように例えば３．３ＭＨ２附近に設定
すれば、文字多重放送信号のクロック周波数音２．ｓＭ
Ｈｚ としたときに色副搬送波と同等に安定化するこ
とができるという制御ができる。If the resonant frequency of the capacitor 11 and coil 12 in FIG. 2 is set to around 3.3 MH2 as shown in FIG. 3, the clock frequency of the teletext signal will be 2. sM
Hz, it can be controlled to be stabilized to the same level as the color subcarrier.
ナオ、第３図はトランジスタ９のコレクタ電流カ股大の
とき（実線）と最小のとき（破線）の周波数特性を示し
、このふたつの間の周波数特性の補償がＩ拝能となる。Figure 3 shows the frequency characteristics when the collector current of the transistor 9 is large (solid line) and when it is minimum (dashed line), and compensation of the frequency characteristics between these two is the best.
なお、カラーバーストが存在し々い白黒放送信号の場合
は、制御電圧全しゃ断すればフィードバックループが切
断されて、周波数特性のコントロールはなされない。Note that in the case of a monochrome broadcast signal in which color bursts are often present, if the control voltage is completely cut off, the feedback loop is cut off and the frequency characteristics are not controlled.
以−１−説明したように本発明によれば、カラーテレビ
ジョン信号のカラーバースト信号の振幅を検出してこれ
を安定化するように制＠をすることによって、映像信号
の高域部分の周波数特性を安定化させることができ、特
に文字多重放送信号が重畳されている場合にその振幅特
性の安定化に大きい効果ヲ得ることができる。As described below, according to the present invention, the frequency of the high frequency portion of the video signal is adjusted by detecting the amplitude of the color burst signal of the color television signal and controlling it to stabilize it. The characteristics can be stabilized, and particularly when a teletext signal is superimposed, a great effect can be obtained in stabilizing the amplitude characteristics.
第１図は本発明の一実施例における周波数特性補償装置
のブロック図、第２図はその要部の具体回路図、第３図
はその動作全説明するための〜特性図である。
１ ・・・チコーナ、２・・・Ｖ工Ｆ僧幅および映像検
波回路、３．・・・固さＵ ＆ ＋ｈ性補償回路、４
・映像片月匙理回路、５・・・色信号帯域フイノ（・
−夕、６、、、、、 Ａ ｃ ｃ回路、９ 、１０−・
”’？ｊｌ ”を成分：ｌ１ｌｌ １ｉｌＴＩ Ｍ動増
幅器。
代理）にの氏名 プｒｌ″１１１Ｔ 中 尾 （教
男 ほか１２第 ユ 図
第２図
ＡＣＣ粘ｎ印電圧
第３図
ｍｌ濠収（閂Ｈｚ）FIG. 1 is a block diagram of a frequency characteristic compensator according to an embodiment of the present invention, FIG. 2 is a specific circuit diagram of the main part thereof, and FIG. 3 is a characteristic diagram for explaining the entire operation thereof. 1...Cicona, 2...V engineer F width and video detection circuit, 3.・・・Hardness U & +h compensation circuit, 4
・Image Katazukishari circuit, 5...Color signal band fin (・
- Evening, 6,,,, A c c circuit, 9, 10-・
``'?jl'' is a component: l1ll 1ilTI M dynamic amplifier. Proxy) Name Prl″111T Nakao (Teacher)
Male and others 12th U Figure 2 ACC adhesive n stamp voltage Figure 3 ml moat collection (bar Hz)
Claims (1)
中の上記色副搬送波成分に含まれるカラーバースト信号
の振巾全検出してその振幅に応じた大きさの制御電ＩＥ
Ｅ’ｅ発生させ、その制御電圧によって上記カラーテレ
ビジョン複合映像信号の高域成分全安定化させるように
上記カラーテレビジョン複合映像信号の増幅回路を制御
するようにしたことを特徴とする周波数特性補償装置。The control voltage IE detects the full amplitude of the color burst signal included in the color subcarrier component in the color television composite video signal including the color subcarrier component, and the control voltage IE has a magnitude corresponding to the amplitude.
A frequency characteristic characterized in that the amplification circuit of the color television composite video signal is controlled so as to generate E'e and to completely stabilize the high frequency components of the color television composite video signal using the control voltage. Compensation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP809682A JPS58124386A (en) | 1982-01-20 | 1982-01-20 | Frequency characteristic compensating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP809682A JPS58124386A (en) | 1982-01-20 | 1982-01-20 | Frequency characteristic compensating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58124386A true JPS58124386A (en) | 1983-07-23 |
Family
ID=11683774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP809682A Pending JPS58124386A (en) | 1982-01-20 | 1982-01-20 | Frequency characteristic compensating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58124386A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3827798A1 (en) * | 1987-08-18 | 1989-03-09 | Mitsubishi Electric Corp | Time-base error correction device |
-
1982
- 1982-01-20 JP JP809682A patent/JPS58124386A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3827798A1 (en) * | 1987-08-18 | 1989-03-09 | Mitsubishi Electric Corp | Time-base error correction device |
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