JPH01268294A - Video signal processing unit - Google Patents
Video signal processing unitInfo
- Publication number
- JPH01268294A JPH01268294A JP63096034A JP9603488A JPH01268294A JP H01268294 A JPH01268294 A JP H01268294A JP 63096034 A JP63096034 A JP 63096034A JP 9603488 A JP9603488 A JP 9603488A JP H01268294 A JPH01268294 A JP H01268294A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- video signal
- signal processing
- output
- pass filter
- 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
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、磁気録画再生装置等の特に再生系に用いて最
適な映像信号処理装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a video signal processing device that is most suitable for use particularly in a playback system such as a magnetic recording and playback device.
従来の技術
２７、−７
第２図は従来の映像信号処理装置の一例を示すブロック
図である。Prior Art 27, -7 FIG. 2 is a block diagram showing an example of a conventional video signal processing device.
第２図において、入力端子１に加えられた複合映像信号
は、ＹＣ分離器２で輝度信号Ｙと色信号Ｃとに分離され
て各々輝度信号処理回路３と色信号処理回路４に供給さ
れ、各々の特性が最適となるように信号処理された後そ
れぞれ加算器６に供給されて再び複合映像信号となり、
出力端子６に出力される。In FIG. 2, a composite video signal applied to an input terminal 1 is separated into a luminance signal Y and a chrominance signal C by a YC separator 2 and supplied to a luminance signal processing circuit 3 and a chrominance signal processing circuit 4, respectively. After each signal is processed to optimize its characteristics, it is supplied to an adder 6 and becomes a composite video signal again.
It is output to the output terminal 6.
例えば５ＶＨ８方式ＶＴＲの再生系に第２図に示した映
像信号処理装置を用いた場合、入力端子１には再生ビデ
オヘッド出力信号が供給され、ＹＣ分離器２はＦＭ変調
された輝度信号を取り出すノ・イパスフィルタと低域変
換された色信号を取り出すローパスフィルタとで構成さ
れる。さらに輝度信号処理回路３はＦＭ復調器、周波数
特性補正器等で構成され、色信号処理回路４は周波数変
換器、自動位相制御器等で構成される。For example, when the video signal processing device shown in Fig. 2 is used in the playback system of a 5VH8 VTR, the playback video head output signal is supplied to the input terminal 1, and the YC separator 2 extracts the FM-modulated luminance signal. It consists of a no-pass filter and a low-pass filter that takes out the low-pass converted color signal. Further, the luminance signal processing circuit 3 includes an FM demodulator, a frequency characteristic corrector, etc., and the chrominance signal processing circuit 4 includes a frequency converter, an automatic phase controller, etc.
発明が解決しようとする課題
ここで、輝度信号処理回路３の出力が極めて広３・・−
・
帯域となると、色信号の帯域と完全に重複することにな
り互いに干渉し合う。特に輝度信号から色信号への干渉
は影響が太き（Ｓ／Ｈの劣化や画面上でのフリッカを招
くことがある。これを防止するため、記録系や再生系に
くし型フィルタを用いるのが一般的であるが、信号帯域
の若干の劣化は免れない。Problem to be Solved by the Invention Here, the output of the luminance signal processing circuit 3 is extremely wide.
- The band completely overlaps with the color signal band and interferes with each other. In particular, interference from luminance signals to chrominance signals has a serious effect (it can cause S/H deterioration and flickering on the screen. To prevent this, comb filters are used in the recording and playback systems. is common, but some deterioration of the signal band is inevitable.
課題を解決するための手段
上記問題点を解決するだめに、本発明の映像信号処理装
置は、複合映像信号から同期信号を取り出す同期分離回
路と、この同期分離回路の出力信号から所定の遅延時間
と所定の時間幅を有する制御パルスを発生する手段と、
前記複合映像信号を輝度信号と色信号とに分離するＹＣ
分離器と、前記分離された輝度信号の高域成分を除去す
るローパスフィルタと、前記分離された輝度信号を一方
の入力とし前記ローパスフィルタの出力信号を他方の入
力とし前記制御パルスで制御される信号スイッチとを具
備するように構成したものである。Means for Solving the Problems In order to solve the above problems, the video signal processing device of the present invention includes a sync separation circuit for extracting a sync signal from a composite video signal, and a predetermined delay time from the output signal of the sync separation circuit. and means for generating a control pulse having a predetermined time width;
YC for separating the composite video signal into a luminance signal and a color signal;
a separator; a low-pass filter for removing high-frequency components of the separated luminance signal; one input of the separated luminance signal and the output signal of the low-pass filter of the other input; controlled by the control pulse; It is configured to include a signal switch.
作用
本発明は前述したような構成によって、分離された輝度
信号の周波数帯域を、色バースト信号期間だけ帯域制限
するので、分離された輝度信号と色信号を再び混合した
場合における輝度信号から色バースト信号への干渉を大
幅に改善し、かつ画面に表示される期間の輝度信号の帯
域劣化を防止することが可能である。Effect of the Invention With the above-described configuration, the present invention limits the frequency band of the separated luminance signal by the color burst signal period, so that when the separated luminance signal and chrominance signal are mixed again, the chrominance signal is separated from the chrominance signal. It is possible to significantly improve signal interference and prevent band deterioration of the luminance signal during the period displayed on the screen.
実施例
以下本発明による映像信号処理装置の一実施例について
図面を参照しながら説明する。Embodiment Hereinafter, an embodiment of a video signal processing apparatus according to the present invention will be described with reference to the drawings.
第１図は同実施例のブロック図を示すものであり、第２
図と同一部分については同一符号を付している。FIG. 1 shows a block diagram of the same embodiment, and the second
The same parts as those in the figure are given the same reference numerals.
第１図において、入力端子１に加えられた複合映像信号
はＹＣ分離器２で輝度信号Ｙと色信号Ｃとに分離されて
各々輝度信号処理回路３と色信号処理回路４に供給され
、各々の特性が最適となるように信号処理される。In FIG. 1, a composite video signal applied to an input terminal 1 is separated into a luminance signal Y and a chrominance signal C by a YC separator 2 and supplied to a luminance signal processing circuit 3 and a chrominance signal processing circuit 4, respectively. The signal is processed so that the characteristics of the signal are optimized.
輝度信号処理回路３の出力は信号スイッチ７の一方の入
力端子に供給されるとともに、ローパス５）＼−７
フィルタ８を介して信号スイッチ７の他方の入力端子に
供給される。The output of the luminance signal processing circuit 3 is supplied to one input terminal of the signal switch 7 , and is also supplied to the other input terminal of the signal switch 7 via a low-pass filter 8 .
輝度信号処理回路３のもう一つの出力は同期分離回路９
に供給される。同期分離回路９の出力は遅延回路１０で
所定の時間だけ遅延された後にモノマルチ回路１１で所
定の時間幅のパルスに波形整形されて前記信号スイッチ
７の制御端子に供給される。信号スイッチ７の出力は加
算器６で色信号処理回路４の出力と加算されて再び複合
映像信号となり、出力端子６に出力される。Another output of the luminance signal processing circuit 3 is a synchronization separation circuit 9.
is supplied to The output of the synchronization separation circuit 9 is delayed by a predetermined time in a delay circuit 10, and then waveform-shaped into a pulse having a predetermined time width in a monomulti circuit 11, and then supplied to the control terminal of the signal switch 7. The output of the signal switch 7 is added to the output of the color signal processing circuit 4 by an adder 6 to form a composite video signal again, which is output to an output terminal 6.
ここでモノマルチ回路１１の出力を色バースト信号期間
よりも前後ともに０．６〜１．０μｓｅｃ程度広く設定
し、かつその期間だけローパスフィルタ８の出力が信号
スイッチ７の出力に導かれるように動作させることによ
って、輝度信号の周波数帯域が色バースト信号期間だけ
帯域制限され、輝度信号から色バーヌト信号への干渉が
大幅に抑制される。尚、ローパスフィルタ８は輝度信号
に対するくし形フィルタで構成してもよい。Here, the output of the mono multi-circuit 11 is set to be about 0.6 to 1.0 μsec wider both before and after the color burst signal period, and operates so that the output of the low-pass filter 8 is guided to the output of the signal switch 7 only during that period. By doing so, the frequency band of the luminance signal is limited by the color burst signal period, and interference from the luminance signal to the color burnout signal is significantly suppressed. Note that the low-pass filter 8 may be configured as a comb filter for the luminance signal.
発明の効果
以上の説明から明らかなように本発明によれば、６１、
−７
比較的簡単な構成によって、画面に表示される期間の輝
度信号の帯域劣化が全くなく、しかも輝度信号から色バ
ースト信号への干渉をほとんど無くすることが可能とな
るような優れた映像信号処理装置を実現できる。Effects of the Invention As is clear from the above explanation, according to the present invention, 61,
-7 An excellent video signal that has a relatively simple configuration, has no band deterioration of the luminance signal during the period displayed on the screen, and almost eliminates interference from the luminance signal to the color burst signal. A processing device can be realized.
第１図は本発明による映像信号処理装置の一実施例を示
すブロック図、第２図は従来の映像信号処理装置の一例
を示すブロック図である。
１・・・・・・入力端子、２・・・・・ＹＯ分離器、３
・・・・・・輝度信号処理回路、４・・・・・・色信号
処理回路、６・・・・・・加算器、６・・・・・出力端
子、７・・・・・・信号スイッチ、８・・・・・・ロー
パスフィルタ、９・・・・・・同期分離回路、１ｏ・・
・・・・遅延回路、１１・・・・・・モノマルチ回路。FIG. 1 is a block diagram showing an embodiment of a video signal processing device according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional video signal processing device. 1...Input terminal, 2...YO separator, 3
...Brightness signal processing circuit, 4 ... Color signal processing circuit, 6 ... Adder, 6 ... Output terminal, 7 ... Signal Switch, 8...Low pass filter, 9...Synchronization separation circuit, 1o...
...Delay circuit, 11...Mono multi circuit.
Claims (1)
前記同期分離回路の出力信号から所定の遅延時間と所定
の時間幅を有する制御パルスを発生する手段と、前記複
合映像信号を輝度信号と色信号とに分離するＹＣ分離器
と、前記分離された映像信号の高域成分を除去するロー
パスフィルタと、前記分離された輝度信号を一方の入力
とし前記ローパスフィルタの出力信号を他方の入力とし
前記制御パルスで制御される信号スイッチとを具備する
ことを特徴とする映像信号処理装置。a synchronization separation circuit that extracts a synchronization signal from the composite video signal;
means for generating a control pulse having a predetermined delay time and a predetermined time width from the output signal of the synchronization separation circuit; a YC separator for separating the composite video signal into a luminance signal and a color signal; A low-pass filter that removes high-frequency components of the video signal; and a signal switch that receives the separated luminance signal as one input, receives the output signal of the low-pass filter as the other input, and is controlled by the control pulse. Features of video signal processing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63096034A JPH01268294A (en) | 1988-04-19 | 1988-04-19 | Video signal processing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63096034A JPH01268294A (en) | 1988-04-19 | 1988-04-19 | Video signal processing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01268294A true JPH01268294A (en) | 1989-10-25 |
Family
ID=14154158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63096034A Pending JPH01268294A (en) | 1988-04-19 | 1988-04-19 | Video signal processing unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01268294A (en) |
-
1988
- 1988-04-19 JP JP63096034A patent/JPH01268294A/en active Pending
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