JPS60219888A - Processor of chrominance signal - Google Patents
Processor of chrominance signalInfo
- Publication number
- JPS60219888A JPS60219888A JP59076075A JP7607584A JPS60219888A JP S60219888 A JPS60219888 A JP S60219888A JP 59076075 A JP59076075 A JP 59076075A JP 7607584 A JP7607584 A JP 7607584A JP S60219888 A JPS60219888 A JP S60219888A
- Authority
- JP
- Japan
- Prior art keywords
- output
- color difference
- signal
- comb
- adder
- 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
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
- H04N9/83—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal
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- 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】
産業上の利用分野
本発明はビデオテープレコーダ(以下、VTRと称す)
に用いられる低域変換搬送色信号を処理する色信号処理
装置に関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a video tape recorder (hereinafter referred to as VTR).
The present invention relates to a color signal processing device that processes a low-pass conversion carrier color signal used in the present invention.
従来例の構成とその問題点
民生用VTRで良く用いられている色信号処理回路は、
副搬送色信号を低域搬送色信号に周波数変換して記録し
、再生時に再び周波数変換して副搬送色信号に戻し、そ
の時に回転シリンダのジッタによって生じる色信号のジ
ッタを取り除く、カラーアンダーと呼ばれる方法である
。Conventional configuration and its problems Color signal processing circuits commonly used in consumer VTRs are:
The sub-carrier color signal is frequency-converted to a low-band carrier color signal and recorded, and during playback, the frequency is converted back to the sub-carrier color signal, and at that time, the jitter of the color signal caused by the jitter of the rotating cylinder is removed. This is how it is called.
第1図にカラーアンダ一方式の従来のアナログ回路によ
る再生系の一例を示す。同図において、再生された低域
変換色信号は平衡変調器1を通り副搬送色信号に周波数
変換され、バンドパスフィルタ2で平衡変調の際に生じ
る不要成分を除去し。FIG. 1 shows an example of a reproduction system using a conventional analog circuit of color under type. In the figure, the reproduced low-pass converted color signal passes through a balanced modulator 1 and is frequency-converted into a subcarrier color signal, and a bandpass filter 2 removes unnecessary components generated during balanced modulation.
くし形フィルタ3に入力される。It is input to a comb filter 3.
一方、出力からパーストゲート4によりバーストを取り
出し、基準発振器11と位相比較器6で位相を比較する
。位相誤差はローパスフィルタ6を通って電圧制御発振
器(以下、vCOと称す)了を制御する。vCO7の出
力は水平同期信号(fH)ラフユーズ・ロックド・ルー
プ(pLL)1oで40倍した周波数と平衡変調器8で
たし合わされバンドパスフィルタ9を通って平衡変調器
1のキャリアを得る。On the other hand, a burst is extracted from the output by a burst gate 4, and its phase is compared by a reference oscillator 11 and a phase comparator 6. The phase error passes through a low-pass filter 6 to control a voltage controlled oscillator (hereinafter referred to as vCO). The output of vCO7 is added to the frequency multiplied by 40 by horizontal synchronization signal (fH) rough-used locked loop (pLL) 1o in balanced modulator 8, and passed through bandpass filter 9 to obtain the carrier of balanced modulator 1.
このようにして出力は常に基準発振器11に位相が同期
するように回路が作動する。この時、くし形フィルタ3
は信号の垂直相関成分を抜き出し。In this way, the circuit operates so that the output is always synchronized in phase with the reference oscillator 11. At this time, comb filter 3
extracts the vertical correlation component of the signal.
SN比を改善する役目と、隣接トラックからのクロスト
ーク成分がある場合、それを除去する役目を果している
。従って、SN比を改善するためには、くシ形フィルタ
3の特性を1色値号の垂直相関成分を多く取り出すよう
な特性にすれば良い。It serves to improve the SN ratio and to remove crosstalk components from adjacent tracks, if any. Therefore, in order to improve the S/N ratio, the characteristics of the comb-shaped filter 3 should be made such that many vertical correlation components of one color value are extracted.
これを第2図を参考にして説明する。第2図は例として
2種類のくし形フィルタの振幅の周波数特性を示したも
のであり、横軸が周波数、縦軸が出力の振幅を示してい
る。色信号は水平周波数げH)の整数倍の周波数にスペ
クトラムのピークを持ち、その周波数の近傍にスペクト
ラムが集中している。This will be explained with reference to FIG. FIG. 2 shows, as an example, the amplitude frequency characteristics of two types of comb filters, with the horizontal axis representing the frequency and the vertical axis representing the output amplitude. The color signal has a spectrum peak at a frequency that is an integral multiple of the horizontal frequency (H), and the spectrum is concentrated near that frequency.
従って、実線で示したaの特性を持つくし形フィルタよ
りも点線で示したbの特性を持つくし形フィルタを用い
た方が色信号のSN比は向上する。Therefore, the SN ratio of the color signal is improved by using the comb filter having the characteristic b shown by the dotted line rather than the comb filter having the characteristic a shown by the solid line.
しかしbの特性を持つフィルタはaの特性を持つフィル
タに比べて遅延時間が大きく、再生画面上で色相や飽和
度が急激に変化するような部分、即ち垂直相関の無い部
分で、輝度信号に対して色信号が画面垂直方向に下がる
のが目立つという欠点があった。これを防ぐ為に、輝度
信号の垂直相関を検出し、相関の無い場合だけ、くシ形
フィルタ3の特性を、たとえば第2図のbからaの特性
に切り換えるという方法がある。しかし、この方法では
色相や飽和度に垂直方向の変化があっても。However, the filter with the characteristic b has a longer delay time than the filter with the characteristic a, and the luminance signal does not change in areas where the hue or saturation changes rapidly on the playback screen, that is, in areas where there is no vertical correlation. On the other hand, there was a drawback in that the color signal dropped in the vertical direction of the screen. In order to prevent this, there is a method of detecting the vertical correlation of the luminance signals, and only when there is no correlation, switching the characteristic of the comb filter 3 from, for example, the characteristic b to the characteristic a in FIG. 2. However, with this method even if there is a vertical change in hue or saturation.
輝度信号には変化が無い場合には特性の切換えが出来な
いという欠点があった。また、色信号は2つの色差信号
が色副搬送波で直角2相変調されているため1色相の垂
直相関を知る為には搬送色信号の位相の変化を検出する
必要があり、くし形フィルタに用いる遅延線の遅延時間
に高い精度が要求される。There is a drawback that the characteristics cannot be switched if there is no change in the luminance signal. In addition, since two color difference signals are quadrature modulated using color subcarriers, it is necessary to detect changes in the phase of the carrier color signal in order to know the vertical correlation of one hue. High accuracy is required for the delay time of the delay line used.
さらに垂直相関の情報は従来は1水平周期期間(以下、
1Hと呼ぶ)前の信号との差から得ていたが、再生され
た低域変換搬送色信号に隣接トラックからのクロストー
クに部分がある場合、1H前の信号との差を取るとクロ
ストーク成分を抜き出すことになり、相関信号を得るこ
とが出来ないという欠点があった。Furthermore, vertical correlation information has conventionally been obtained over one horizontal cycle period (hereinafter referred to as
However, if the reproduced low frequency conversion carrier color signal has a part due to crosstalk from the adjacent track, the crosstalk can be obtained by taking the difference from the signal 1H before. This method had the disadvantage that a component had to be extracted and a correlation signal could not be obtained.
発明の目的
本発明の目的は、低域変換搬送色信号の処理を復調器と
、復調器で復調された色差信号の振幅の垂直相関に応じ
て、振幅周波数特性の変化するくし形フィルタを用いる
ことにより1色信号のSN比を改善し、且つ色相や飽和
度が変化する部分で色信号の垂直方向の遅れを低減させ
ることにある。Object of the Invention The object of the present invention is to process a low-pass conversion carrier color signal by using a demodulator and a comb filter whose amplitude frequency characteristics change according to the vertical correlation of the amplitudes of the color difference signals demodulated by the demodulator. This aims to improve the SN ratio of one color signal and reduce the vertical delay of the color signal in areas where the hue and saturation change.
また本発明の別の目的は低域変換搬送色信号に隣接トラ
ックからのクロストークがある場合でも。Another object of the present invention is to provide a low-pass conversion carrier color signal even when there is crosstalk from adjacent tracks.
くし形フィルタの特性の制御を正確に行える色信号処理
装置を提供することにある。An object of the present invention is to provide a color signal processing device that can accurately control the characteristics of a comb filter.
さらに本発明の別の目的は、くシ形フィルタとして、帰
還形のくし形フィルタを用いることにより。Yet another object of the present invention is to use a feedback comb filter as the comb filter.
非帰還形のくし形フィルタを用いた場合に比べてSN比
の良い色信号処理装置を得ることにある。The object of the present invention is to obtain a color signal processing device with a better signal-to-noise ratio than when a non-feedback comb filter is used.
発明の構成
本発明の色信号処理装置は、低域変換搬送色信号を2つ
の色差信号に復調する復調器と、前記復調器により復調
された2つの色差信号をそれぞれ通過させる非線形の応
答をする第1および第2のくし形フィルタを含めて構成
される。Configuration of the Invention The color signal processing device of the present invention includes a demodulator that demodulates a low-pass conversion carrier color signal into two color difference signals, and a nonlinear response that allows each of the two color difference signals demodulated by the demodulator to pass through. The device includes first and second comb filters.
実施例の説明
以下、本発明の実施例について図面を参照しながら説明
する。第3図は本発明の一実施例の構成を示したブロッ
ク図である。本実施例では遅延線を2つ用いた場合につ
いて説明する。再生された低域変換搬送色信号は入力端
子31に入力されて復調器2oに入り、2つの色差信号
に復調されて。DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing the configuration of an embodiment of the present invention. In this embodiment, a case will be described in which two delay lines are used. The reproduced low-frequency conversion carrier color signal is input to the input terminal 31, enters the demodulator 2o, and is demodulated into two color difference signals.
それぞれくし形フィルタ24と26に入力される。The signals are input to comb filters 24 and 26, respectively.
くし形フィルタ24と26を通った色差信号は変調器3
0で直角二相変調されて搬送色信号となり。The color difference signal passed through the comb filters 24 and 26 is sent to the modulator 3.
0, it is quadrature two-phase modulated and becomes a carrier color signal.
出力端子32に出力される。くし形フィルタ26はくし
形フィルタ24と同じ構成のフィルタである。It is output to the output terminal 32. The comb filter 26 has the same configuration as the comb filter 24.
次に、くし形フィルタ24の構成について説明する。復
調器2oで復調された色差信号のうちの一方の信号は1
H遅延線21を通り、遅延1lJ21を通過しない信号
と加算器26で加算される。加算器26の出力は1H遅
延線22に入力される。Next, the configuration of the comb filter 24 will be explained. One of the color difference signals demodulated by the demodulator 2o is 1
The signal that passes through the H delay line 21 and does not pass through the delay 1lJ21 is added by the adder 26. The output of the adder 26 is input to the 1H delay line 22.
加算器27では加n器26の出力と1H遅延線22の出
力とが加算され、減算器28では加算器26の出力から
1H遅延線22の出力が減算される。The adder 27 adds the output of the adder 26 and the output of the 1H delay line 22, and the subtracter 28 subtracts the output of the 1H delay line 22 from the output of the adder 26.
次に減算器28の出力はスライサ23を通り加算器29
で加算器27の出力と加算されて変調器3oに送られる
。スライサ23は、たとえば第4図(、)あるいは(b
)に示す入力特性を持つものであり。Next, the output of the subtracter 28 passes through the slicer 23 to the adder 29.
It is added to the output of the adder 27 and sent to the modulator 3o. The slicer 23 is, for example, shown in FIG.
) has the input characteristics shown below.
入力信号の振幅がある一定しベルTを越えると出力が現
われるものである。When the amplitude of the input signal is constant and exceeds a bell T, an output appears.
次に前記くし形フィルタ24の特性について説明する。Next, the characteristics of the comb filter 24 will be explained.
第6図(a)は減算器28の出力振幅の周波数特性を示
している。色信号を低域変換して記録するVTRでは低
域搬送波をフィールド毎に反転を行なったり、一方のフ
ィールドでけ1ライン毎に位相を900進捷せ次のフィ
ールドでM2O3遅らせる等の方法を用いており、この
様な信号を色差信号に復調した際には2色差信号はJH
,(nは整数)の周波数にスペクトラムが集まり、クロ
ストーク成分は(n−1−4)fH,(nは整数)の周
波数にスペクトラムが集まる。また、色差信号はnfH
の周波数から離れた成分和、相勤低い情報である。従っ
て第6図(、)に示す特性を持つ減算器28の出力には
色差信号の垂直相関の低さを表わす情報が得られる。即
ち減算器28の出力には色差信号に垂直相関の低い程、
大きな出力が得られる。しかもこの時、クロストーク成
分は現われない。これは第5図(、)の特性から明らか
なように。FIG. 6(a) shows the frequency characteristics of the output amplitude of the subtracter 28. VTRs that record color signals by converting them to low frequencies use methods such as inverting the low frequency carrier wave for each field, or changing the phase by 900 for each line in one field and delaying it by M2O3 in the next field. When demodulating such a signal into a color difference signal, the two color difference signals are JH
, (n is an integer), and the spectrum of the crosstalk component is (n-1-4)fH, (n is an integer). Also, the color difference signal is nfH
The sum of components far from the frequency of is information with low correlation. Therefore, the output of the subtracter 28 having the characteristics shown in FIG. 6(,) provides information indicating the low vertical correlation of the color difference signals. In other words, the output of the subtractor 28 has a lower vertical correlation in the color difference signal.
Large output can be obtained. Moreover, at this time, no crosstalk component appears. This is clear from the characteristics shown in Figure 5 (,).
減算器28の出力には(n++)fHの成分は現われな
いからである。次に、この減算器28の出力はスライサ
23に入力される。スライサ23の特性がたとえば第4
図(b)に示すものとすると、スライサ23の出力には
色差信号の垂直相関が低い時にのみ信号が現われる。従
って加算器29の出力には9色差信号の垂直相関が低い
時は加算器26の出力の2倍の出力が得られ、垂直相関
の高い時には加算器26の出力と加算器26の出力を1
H遅らせた信号、即ち加算器27の出力がその11現わ
れる。従って、くし形フィルタ24としての特性は2色
差信号の垂直相関が低い場合は第6図fb)の実線で示
される特性を持つ。これは従来の1H形のくし形フィル
タの特性である。また垂直相関の高い場合には第5図(
b)の点線で示される特性を持つ。従って従来よりもS
N比が改善され、垂直相関の低い部分の色信号の垂直方
向への遅れが少ない。This is because the (n++)fH component does not appear in the output of the subtracter 28. Next, the output of this subtracter 28 is input to the slicer 23. For example, if the characteristics of the slicer 23 are
As shown in FIG. 2B, a signal appears in the output of the slicer 23 only when the vertical correlation of the color difference signals is low. Therefore, when the vertical correlation of the nine color difference signals is low, the output of the adder 29 is twice the output of the adder 26, and when the vertical correlation is high, the output of the adder 26 and the output of the adder 26 are
The 11th signal delayed by H, ie, the output of the adder 27, appears. Therefore, the characteristics of the comb filter 24 have the characteristics shown by the solid line in FIG. 6 fb) when the vertical correlation of the two color difference signals is low. This is a characteristic of a conventional 1H type comb filter. In addition, when the vertical correlation is high, Figure 5 (
It has the characteristics shown by the dotted line in b). Therefore, S
The N ratio is improved, and the delay in the vertical direction of the color signal in the portion with low vertical correlation is reduced.
スライサ23が第4図ta)に示す特性を有する場合に
は(b) K比べて、くシ形フィルタ24.25の出力
の直流レベルが変化するだけで同様の動作を行う。When the slicer 23 has the characteristics shown in FIG. 4 (ta), it performs the same operation as in (b) K, except that the DC level of the output of the comb filters 24 and 25 changes.
なお、再生された低域変換色信号にクロストーク成分が
無い場合には、IH遅延線21と加算器26を省くこと
が出来る。Note that if there is no crosstalk component in the reproduced low-frequency conversion color signal, the IH delay line 21 and the adder 26 can be omitted.
この時、減算器28の特性は第5p(c)の特性を示し
、前に述べたと同様、垂直相関に応じた信号が得られる
。この場合、くし形フィルタ24 、26の特性は1色
差信号の垂直相関が低い場合には入力がそのまま現われ
、高い場合には第5図(blに実線で示す特性を持つ。At this time, the characteristic of the subtractor 28 exhibits the fifth p(c) characteristic, and a signal corresponding to the vertical correlation is obtained as described above. In this case, the characteristics of the comb filters 24 and 26 are such that when the vertical correlation of one color difference signal is low, the input appears as is, and when it is high, it has the characteristics shown by the solid line in FIG. 5 (bl).
また、本実施例では遅延線を2つ(遅延線21゜22)
を用いたが、遅延線を3つ以上用いても第6図(a)に
示す特性を得る構成を用いれば同様の効果を得ることが
できる。In addition, in this embodiment, there are two delay lines (delay lines 21° and 22).
However, the same effect can be obtained by using a configuration that obtains the characteristics shown in FIG. 6(a) even if three or more delay lines are used.
次に、第6図を参照しながら本発明の別の実施例につい
て説明する。第6図は本発明の別の実施例の構成を示し
たブロック図である。本実施例では遅延線を2つ用いた
場合について説明する。再生された低域変換搬送色信号
は入力端子62に入力されて復調器4oに入シ2つの色
差信号に復調されてそれぞれ、くシ形フィルタ46と4
7に入力される。くし形フィルタ46と47を通った色
差信号は変調器45で直角二相変調されて搬送色信号と
なり出力端子53に出力される。くし形フィルタ47は
くし形フィルタ46と同じ構成のフィルタである。次に
、くし形フィルタ46の構成について説明する。復調器
40で復調された色差信号のうち一方の信号は1H遅延
線41を通り、遅延線41を通過しない信号と加算器4
8で加算される。加算器48の出力は加算器49を通っ
て1H遅延線42に入る。減算器6oけ加算器49の出
力を1H遅延した信号から加算器49の出力を減算する
。加算器51け加算器49の出力と加算器49の出力を
1H遅延した信号を加算する。Next, another embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block diagram showing the configuration of another embodiment of the present invention. In this embodiment, a case will be described in which two delay lines are used. The reproduced low-pass conversion carrier color signal is inputted to the input terminal 62 and input to the demodulator 4o, where it is demodulated into two color difference signals, and the comb-shaped filters 46 and 4, respectively.
7 is input. The color difference signal that has passed through the comb filters 46 and 47 is subjected to quadrature two-phase modulation by a modulator 45 to become a carrier color signal, which is output to an output terminal 53. The comb filter 47 has the same configuration as the comb filter 46. Next, the configuration of the comb filter 46 will be explained. One of the color difference signals demodulated by the demodulator 40 passes through the 1H delay line 41, and the signal that does not pass through the delay line 41 and the adder 4
8 is added. The output of adder 48 passes through adder 49 and enters 1H delay line 42 . The output of the adder 49 is subtracted from the signal obtained by delaying the output of the adder 49 by 1H. The output of the 51 adder 49 and the signal obtained by delaying the output of the adder 49 by 1H are added.
減算器60の出力はリミッタ44を通り増幅器43で増
幅されて加算器49へ帰還される。リミッタ44it
rたとえば第7図(、)や(b)に示す特性を有し入力
レベルが一定値Tを越えると出力が一定〔(b)では零
〕になるものである。また、増幅器43は1以下の増幅
率を持っても良い。即ち減衰器であっても良い1、
次に、このくし形フィルタ46の特性を増幅器43の利
得が1の場合について説明する。減算器50の出力振幅
の周波数特性は第8図f、)に示す特性を示す。従−)
て前の実施例で説明したように。The output of the subtracter 60 passes through the limiter 44, is amplified by the amplifier 43, and is fed back to the adder 49. limiter 44it
For example, it has the characteristics shown in FIGS. 7(a) and (b), and when the input level exceeds a certain value T, the output becomes constant (zero in (b)). Further, the amplifier 43 may have an amplification factor of 1 or less. In other words, it may be an attenuator.Next, the characteristics of the comb filter 46 will be described in the case where the gain of the amplifier 43 is 1. The frequency characteristic of the output amplitude of the subtracter 50 shows the characteristic shown in FIG. 8(f). Follow-)
As explained in the previous example.
減算器50の出力はくし形フィルタ46に入力された色
差信号の垂直相関が低い場合程、大きな出力が現われる
。また、クロストーク成分は現われない。この減3′)
−器60の出力はリミッタ44と増幅器43?1:通っ
て加算器49に帰還されるから。The output of the subtracter 50 appears larger when the vertical correlation of the color difference signals input to the comb filter 46 is lower. Further, no crosstalk component appears. This reduction 3')
The output of the -box 60 is fed back to the adder 49 through the limiter 44 and the amplifier 43?1:.
くし形フィルタ46の特性は、入力信号の垂直相関が低
い場合には非帰還形フィルタの特性を示し〔第7図fb
)の実線で示した特性〕 、高い場合には帰還形フィル
タとなり第8図(b)の点線で示した特性となる。なお
、再生された低域変換色信号にクロストーク成分が無い
場合には1H遅延線41と加算器48を省くことが出来
る。The characteristics of the comb filter 46 exhibit the characteristics of a non-feedback filter when the vertical correlation of the input signal is low [FIG.
) is high, it becomes a feedback type filter and has the characteristic shown by the dotted line in FIG. 8(b). Note that if there is no crosstalk component in the reproduced low-frequency conversion color signal, the 1H delay line 41 and the adder 48 can be omitted.
この時、減算器60の特性は第8図(C)の特性を示し
、前に述べたと同様、垂直相関に応じた信号が得られる
。この場合、くし形フィルタ46 、47の何件は2色
差信号の垂直相関が低い場合には第8図(d)の実線で
表わす特性を示し、高い場合には第8図fd)の点線で
表わす特性を示す。また本実施例では増幅器43の利得
を大きくすることにより。At this time, the characteristics of the subtracter 60 exhibit the characteristics shown in FIG. 8(C), and a signal corresponding to the vertical correlation is obtained as described above. In this case, the comb filters 46 and 47 exhibit the characteristics shown by the solid line in FIG. 8(d) when the vertical correlation of the two color difference signals is low, and the dotted line in FIG. 8(fd) when it is high. Indicates the characteristic it represents. Also, in this embodiment, by increasing the gain of the amplifier 43.
くし形フィルタの特性をより急俊にすることが出来る。The characteristics of the comb filter can be made more rapid.
特性の一例を第8図(b)の一点鎖線に示した。An example of the characteristics is shown by the dashed line in FIG. 8(b).
これは1H遅延線41と加算器48を用いた時の特性で
ある。This is a characteristic when the 1H delay line 41 and the adder 48 are used.
本実施例ではくし形フィルタが帰還形となるので。In this embodiment, the comb filter is of the feedback type.
より高いSN比の改善効果が得られ、帰還量を変えるこ
とにより特性を変化させることが出来る。A higher SN ratio improvement effect can be obtained, and the characteristics can be changed by changing the amount of feedback.
壕だ、本実施例では遅延線を2つ(遅延線41゜42)
を用いたが、遅延線を3つ以上用いても第6図(a)に
示す特性を得る構成を用いitは同様の効果を得ること
ができる。In this example, there are two delay lines (41°42 delay lines).
However, even if three or more delay lines are used, similar effects can be obtained using a configuration that obtains the characteristics shown in FIG. 6(a).
発明の効果
以上の説明から明らかなように9本発明は従来の色信号
処理装置に比べて出力のSN比を改善でき、しかも、そ
の際に色信号の垂直方向の遅れを低減できるものである
。また、低域変換搬送色信号を2つの色差信号に復調し
、それぞれの色差信号の振幅の垂直相関に応じてくし形
フィルタの特性を制御することで9色信号の飽和度と色
相の垂直相関に応じた制御が可能となる。従って非線形
素子として、振幅のスライサあるいはリミッタを用いる
だけで良く、搬送色信号を処理するのに対して位相を検
出する必要が無い。さらに再生された低域変換色信号に
隣接トラックからのクロストークがある場合にも誤動作
無く垂直相関に応じてくし形フィルタをコントロールす
ることができる。Effects of the InventionAs is clear from the above explanation, the present invention can improve the output signal-to-noise ratio compared to conventional color signal processing devices, and can also reduce the vertical delay of the color signal. . In addition, by demodulating the low-pass conversion carrier color signal into two color difference signals and controlling the characteristics of the comb filter according to the vertical correlation of the amplitude of each color difference signal, the vertical correlation between the saturation level and hue of the nine color signals can be achieved. It becomes possible to control according to the Therefore, it is sufficient to use only an amplitude slicer or a limiter as a nonlinear element, and there is no need to detect the phase while processing the carrier color signal. Furthermore, even if there is crosstalk from adjacent tracks in the reproduced low-frequency conversion color signal, the comb filter can be controlled in accordance with the vertical correlation without malfunction.
また、くし形フィルタを帰還形で構成した場合には、非
帰還形のフィルタに比べてさらにSN比の改善効果が大
きいという特長を有する。Further, when the comb filter is configured as a feedback type filter, it has a feature that the SN ratio is improved more effectively than a non-feedback type filter.
第1図は従来例の構成を示したブロック図、第2図はく
し形フィルタの特性図、第3図は本発明の一実施例の構
成を示したブロック図、第4図(a)。
(b)は本発明の一実施例に用いたスライサ入出力特性
を示した特性図、第6図(a) 、 (b) 、 (c
)は本発明の一実施例に用いたくし形フィルタの各部の
周波数似の実施例に用いたリミッタの入出力特性を示し
た特性図、第8図(a) 、 (b) 、 (C) 、
(d)は本発明の他の実施例に用いたくし形フィルタ
の各部の周波数特性図である。
20.40・・・・・・復調器、23・・・・・・スラ
イサ、24.25,46.47・・・・・・くし形フィ
ルタ、30.45・・・・・・変調器、43・・・・・
・増幅器、44・・・・・・リミッタ。
シ図
n′墾I/、 問・皮秋
第4図
第5図
72− 整敷FIG. 1 is a block diagram showing the configuration of a conventional example, FIG. 2 is a characteristic diagram of a comb filter, FIG. 3 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 4(a). (b) is a characteristic diagram showing the input/output characteristics of the slicer used in one embodiment of the present invention, and FIGS. 6(a), (b), (c
) are characteristic diagrams showing the input/output characteristics of the limiter used in the embodiment, which are similar in frequency to each part of the comb filter used in the embodiment of the present invention; FIGS. 8(a), (b), (C),
(d) is a frequency characteristic diagram of each part of a comb filter used in another embodiment of the present invention. 20.40... Demodulator, 23... Slicer, 24.25, 46.47... Comb filter, 30.45... Modulator, 43...
・Amplifier, 44...Limiter. Fig. 4, Fig. 5, 72- Seishi
Claims (1)
る復調器と、前記復調器によシ復調される2つの色差信
号をそれぞれ通過させる非線形の応答をする第1および
第2のくし形フィルタを具備して成ることを特徴とする
色信号処理装置。 (2)第1および第2のくし形フィルタは、色差信号を
通す複数個の遅延回路と、周波数特性が色差信号のスペ
クトラムとクロストーク成分のスペクトラムの位置に谷
の周波数が得られるように、入力と前記遅延回路の各々
の出力に一定の係数を掛けてたし合わせる演算回路と、
該演算回路の出力の振幅を制御する振幅制御回路を具備
し、前記振幅制御回路の出力と、前記遅延回路の各々の
出力に前記係数とは異なる一定の係数を掛けてたし合わ
せた出力とを力1算して第1および第2のくし形フィル
タの出力とすることを特徴とする特許請求の範囲第(1
)項記載の色信号処理装置。 (3) 第1および第2のくし形フィルタは、色差信号
を通す遅延回路と、周波数特性が色差信号のスペクトラ
ムの位置に谷の周波数が得られるように。 入力と前記遅延回路の各々の出力に一定の係数を掛けて
たし合わせる演算回路と、該演算回路の出力の振幅を制
御する振幅制御回路を具備し、前記振幅制御回路の出力
と前記遅延回路の各々の出力に前記係数とは異なる一定
の係数を掛けてたし合わせた出力とを加算して第1およ
び第2のくし形フィルタの出力とすることを特徴とする
特許請求の範囲第(1)項記載の色信号処理装置。 (4)第1および第2のくし形フィルタは色差信号を通
す複数個の遅延回路と、周波数特性が色差信号のスペク
トラムとクロストーク成分のスペクトラムの位置に谷の
周波数が得られるように、入力と前記遅延回路の各々の
出力に一定の係数を掛けてたし合わせる演算回路と、該
演算回路の出力の振幅を制御する振幅制御回路を具備し
、前記振幅制御回路の出力を前記遅延回路に帰還し、前
記第1および第2のくし形フィルタの出力を、入力と前
記遅延回路の出力に前記係数とは異なる一定の係数を掛
けてたし合わせて得ることを特徴とする特許請求の範囲
第(1)項記載の色信号処理装置。 (6)第1および第2のくし形フィルタは、色差信号を
通す遅延回路と、周波数特性が色差信号のスペクトラム
の位置に谷の周波数が得られるように。 入力と前記遅延回路の各々の出力に一定の係数を掛けて
たし合わせる演算回路と、該演算回路の出力の振幅を制
御する振幅制御回路を具備し、前記振幅制御回路の出力
を前記遅延回路に帰還し、第1および第2のくし形フィ
ルタの出力を、入力と前記遅延回路の出力に前記係数と
は異なる一定の係数を掛けてたし合わせて得ることを特
徴とする特許請求の範囲第(1)項記載の色信号処理装
置。[Scope of Claims] (1) A demodulator that demodulates a low-frequency conversion carrier color signal into two color difference signals, and a demodulator that has a nonlinear response that passes each of the two color difference signals demodulated by the demodulator. 1. A color signal processing device comprising first and second comb filters. (2) The first and second comb-shaped filters include a plurality of delay circuits that pass the color difference signal, and have frequency characteristics such that a valley frequency is obtained at the position of the spectrum of the color difference signal and the spectrum of the crosstalk component. an arithmetic circuit that multiplies the input and the output of each of the delay circuits by a certain coefficient and adds them together;
an amplitude control circuit for controlling the amplitude of the output of the arithmetic circuit, and an output obtained by multiplying the output of the amplitude control circuit and each output of the delay circuit by a constant coefficient different from the coefficient; Claim 1 (1) is characterized in that the output of the first and second comb filters is obtained by adding the power
) The color signal processing device described in item 2. (3) The first and second comb filters are delay circuits that pass the color difference signal, and the frequency characteristics are such that a valley frequency is obtained at the position of the spectrum of the color difference signal. an arithmetic circuit that multiplies and adds an input and each output of the delay circuit by a certain coefficient; and an amplitude control circuit that controls the amplitude of the output of the arithmetic circuit, the output of the amplitude control circuit and the delay circuit. The outputs of the first and second comb filters are obtained by multiplying each output by a constant coefficient different from the coefficient and adding the summed outputs. 1) The color signal processing device described in item 1). (4) The first and second comb filters include a plurality of delay circuits that pass the color difference signal, and the input frequency characteristics are such that a valley frequency is obtained at the position of the spectrum of the color difference signal and the spectrum of the crosstalk component. and an arithmetic circuit that multiplies the outputs of each of the delay circuits by a certain coefficient and adds them together, and an amplitude control circuit that controls the amplitude of the output of the arithmetic circuit, and outputs the output of the amplitude control circuit to the delay circuit. Claims characterized in that the outputs of the first and second comb filters are obtained by multiplying the input and the output of the delay circuit by a constant coefficient different from the coefficient and adding them together. The color signal processing device according to item (1). (6) The first and second comb filters are delay circuits that pass the color difference signal, and have frequency characteristics such that a valley frequency is obtained at the position of the spectrum of the color difference signal. an arithmetic circuit that multiplies an input and each output of the delay circuit by a certain coefficient, and an amplitude control circuit that controls the amplitude of the output of the arithmetic circuit; and the outputs of the first and second comb filters are obtained by multiplying the input and the output of the delay circuit by a constant coefficient different from the coefficient and adding them together. The color signal processing device according to item (1).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59076075A JPS60219888A (en) | 1984-04-16 | 1984-04-16 | Processor of chrominance signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59076075A JPS60219888A (en) | 1984-04-16 | 1984-04-16 | Processor of chrominance signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60219888A true JPS60219888A (en) | 1985-11-02 |
Family
ID=13594681
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59076075A Pending JPS60219888A (en) | 1984-04-16 | 1984-04-16 | Processor of chrominance signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60219888A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6161593A (en) * | 1984-08-31 | 1986-03-29 | Mitsubishi Electric Corp | Processing circuit of chrominance signal |
JPS62263794A (en) * | 1986-05-10 | 1987-11-16 | Sony Corp | Chroma signal processing circuit for video tape recorder |
DE3735122A1 (en) * | 1986-10-17 | 1988-04-28 | Sony Corp | CIRCUIT ARRANGEMENT FOR PROCESSING COLOR VIDEO SIGNALS |
JPH0898207A (en) * | 1995-03-24 | 1996-04-12 | Sony Corp | Chroma signal processing circuit for video tape recorder |
-
1984
- 1984-04-16 JP JP59076075A patent/JPS60219888A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6161593A (en) * | 1984-08-31 | 1986-03-29 | Mitsubishi Electric Corp | Processing circuit of chrominance signal |
JPH0556078B2 (en) * | 1984-08-31 | 1993-08-18 | Mitsubishi Electric Corp | |
JPS62263794A (en) * | 1986-05-10 | 1987-11-16 | Sony Corp | Chroma signal processing circuit for video tape recorder |
DE3735122A1 (en) * | 1986-10-17 | 1988-04-28 | Sony Corp | CIRCUIT ARRANGEMENT FOR PROCESSING COLOR VIDEO SIGNALS |
JPH0898207A (en) * | 1995-03-24 | 1996-04-12 | Sony Corp | Chroma signal processing circuit for video tape recorder |
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