JPH02186787A - Y/c separation circuit - Google Patents
Y/c separation circuitInfo
- Publication number
- JPH02186787A JPH02186787A JP1004972A JP497289A JPH02186787A JP H02186787 A JPH02186787 A JP H02186787A JP 1004972 A JP1004972 A JP 1004972A JP 497289 A JP497289 A JP 497289A JP H02186787 A JPH02186787 A JP H02186787A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- mode
- chroma
- recording
- 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.)
- Granted
Links
- 238000000926 separation method Methods 0.000 title claims abstract description 51
- 239000002131 composite material Substances 0.000 claims description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000001172 regenerating effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 230000005484 gravity Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 101000860173 Myxococcus xanthus C-factor Proteins 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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
- H04N9/8205—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 involving the multiplexing of an additional signal and the colour video signal
-
- 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
-
- 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
- H04N9/7908—Suppression of interfering signals at the reproducing side, e.g. noise
-
- 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
- H04N9/7908—Suppression of interfering signals at the reproducing side, e.g. noise
- H04N9/7912—Suppression of interfering signals at the reproducing side, e.g. noise the interfering signals being intermodulation signals
-
- 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
- H04N9/7921—Processing of colour television signals in connection with recording for more than one processing mode
-
- 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
- H04N9/832—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 using an increased bandwidth for the luminance or the chrominance signal
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Television Signal Processing For Recording (AREA)
- Filters That Use Time-Delay Elements (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Ｖ Ｔ Ｒと略
記）の信号処理に係り、特にＰＡＬ方式ビデオ信号の輝
度信号とクロマ信号との分離（以下、Ｙ／Ｃ分離と略記
）に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to signal processing of a video tape recorder (hereinafter abbreviated as VTR), and in particular to separation of a luminance signal and a chroma signal of a PAL video signal. (hereinafter abbreviated as Y/C separation).
（従来の技術〕
ＰＡＬ方式において、クロマ信号は、色副搬送波周波数
ｔｓｃが皿↑ｕ＋２５１１ｚ（但し、ｔｏは水平走査周
波数で１５，６２５Ｋ）ｈ）に設定されており、輝度信
号に対し」二のオフセット周波数を持ちインターリーブ
されている。この信号をクロマ信号と輝度信号に分離す
るために、従来は第２図の如く中心周波数がｆｓｃのト
ラップ２４（以下ｔｓｃトラップと称す、）と、ｉＳＣ
±５００ＫＩＩｚを通過帯域とするバンドパスフィルタ
２５（以下Ｂ Ｐ Ｆと略記）を用いていた。ｔｓｃト
ラップの代りに、ローパスフィルタ（以下ＬＰＦと略記
）を用いる場合もある。また、一般にコンポジットビデ
オ信号を輝度信号とクロマ信号に分離する方法としては
、垂直方向のライン相関性を利用したくし形フィルタに
よるものがある０次にＰＡＬ方式のくし形フィルタにつ
いて第５図を用いて説明する。３９は２Ｈ遅延線（Ｈは
水平走査期間を示す）、４１はインコライザー ４２は
ＢＰＦ、４０゜４３は減算器を示す、前述した如く、ク
ロマ信号器４３で減算することにより輝度くし形フィル
タ出力信号Ｙ （Ｙ＝Ｖ （クロマ帯域（ｆｓｃ±５０
０Ｋ Ｉｌｚ ）を除く帯域）、Ｙ＝Ｔ（ｖ十ｖスＤ）
（クロマ帯域））が４９より得られる。上述の輝度くし
形フィルタの伝達関数をＫｙｅ（’ω）（クロマ帯域を
除く帯域） 、 Ｋｙｅ（ω）（クロマ帯域）とし、ク
ロマくし形フィルタの伝達関数をＫｃ（ω）とする。(Prior art) In the PAL system, the color subcarrier frequency tsc of the chroma signal is set to ↑u+2511z (however, to is the horizontal scanning frequency of 15,625K)h), and the chroma signal has a color subcarrier frequency tsc of 2. Interleaved with offset frequency. In order to separate this signal into a chroma signal and a luminance signal, conventionally a trap 24 with a center frequency of fsc (hereinafter referred to as tsc trap) and an iSC
A bandpass filter 25 (hereinafter abbreviated as BPF) having a passband of ±500KIIz was used. A low pass filter (hereinafter abbreviated as LPF) may be used instead of the tsc trap. Generally, a method for separating a composite video signal into a luminance signal and a chroma signal is to use a comb filter that utilizes vertical line correlation. I will explain. 39 is a 2H delay line (H indicates the horizontal scanning period), 41 is an equalizer, 42 is a BPF, and 40 degrees 43 is a subtracter.As mentioned above, by subtracting with the chroma signal generator 43, the luminance comb filter output is obtained. Signal Y (Y=V (Chroma band (fsc±50
0K Ilz)), Y=T(v+vsD)
(chroma band)) is obtained from 49. The transfer functions of the luminance comb filter described above are Kye('ω) (band excluding chroma band) and Kye(ω) (chroma band), and the transfer function of the chroma comb filter is Kc(ω).
また、遅延線の遅延時間をτとすると、くシ形フィルタ
は。Also, if the delay time of the delay line is τ, then the comb filter is:
ｘｙθ（ω）＝１ ・・・・・・・（１）持っている
ため、２Ｈ箭後の信号を減算することでクロマ信号を取
り出すことができる。即ち、減算器４０で得られる信号
（Ａ）は、現信号（Ｖ）と２Ｈ遅延した信号（ＶａＩｌ
＋）の差をとったものである０次に信号（Ａ）をＢＰＦ
３４で抜き取った信号（Ｂ）をクロマくし形フィルタ出
力信号Ｃ（Ｃ＝Ｈ（Ｖ−Ｖｔｉ＋ ））として４５より
出力し。xyθ(ω)=1 (1) Therefore, the chroma signal can be extracted by subtracting the signal after 2H. That is, the signal (A) obtained by the subtracter 40 is a signal (VaIl) delayed by 2H from the current signal (V).
+) The zero-order signal (A), which is the difference between
The signal (B) extracted at 34 is outputted from 45 as a chroma comb filter output signal C (C=H(V-Vti+)).
また、 １５１信号（Ｖ）からクロマ信号（Ｂ）を減算
あり、ｅ−Ｊ″！１は２ Ｈ遅延線の伝達関数を示す。In addition, the chroma signal (B) is subtracted from the 151 signal (V), and e-J''!1 represents the transfer function of the 2H delay line.
なお、上記くし形フィルタを用いたＹ／Ｃ分離手段につ
いては１テレビジＪン学会誌Ｖｏ１４２゜Ｎａ８．１９
８８’等に示されている。Regarding the Y/C separation means using the above-mentioned comb filter, please refer to 1 Television Journal Society Vo142゜Na8.19.
88' etc.
〔発明が解決しようとする問題点〕 上記従来技術は、以下のような問題点があった。[Problem that the invention seeks to solve] The above conventional technology has the following problems.
ｔ１１ｃトラップと１３ＰＦでＹ／Ｃ分離を°行なう方
法、もしくはＬＰＦとＢＰＦでＹ／Ｃ分離を行なう方法
では５例えば、０〜５ＭＩＩｚ程度の信号を記録再生す
るＶＴＲにおいては、解像度劣化につながる。A method of performing Y/C separation using a t11c trap and a 13PF, or a method of performing Y/C separation using an LPF and a BPF, leads to resolution degradation, for example, in a VTR that records and reproduces signals of about 0 to 5 MIIz.
ＶＴＲで記録再生する場合、記録時に輝度信号中に残っ
たクロマ成分が、再生時ＡＰＣ（Ａｕｔ。When recording and playing back on a VTR, the chroma component that remains in the luminance signal during recording is APC (Aut) during playback.
Ｐｈａｓｅ Ｃｏｎｔｒｏｌ）により位相安定化され
たクロマ信号に対し妨害を及ぼす、この妨害を以下刃ラ
ーモアレと呼ぶ、即ち、カラー信号を十分に抑圧できな
いｔ ｓｃ トラップやＬＰＦ、さらに十分な７７０分
離性能を持たないくし形フィルタ等でＹ／Ｃ分離を行な
った場合には、上記カラーモアレが問題となる。(Phase Control), this interference is hereinafter referred to as Larmoire, i.e., a tsc trap or LPF that cannot sufficiently suppress the color signal, and a tsc trap or LPF that does not have sufficient 770 separation performance. When Y/C separation is performed using a comb filter or the like, the color moiré described above becomes a problem.
１テレビジ膳ン学会誌Ｖｏｌ ４２． Ｎａ８．１９８
８Ｐ８１２〜ｐ ８１６’に示される方法は、記録のＹ
／Ｃ分離の性能を十分確保することによりカラーモアレ
を防止するものであり、自己録再においては特に問題は
ない、しかし、記録時のＹ／Ｃ分離が不十分な互換テー
プに対するカラーモアレ対策が行なわれておらず問題が
あった。1 Journal of Television and Dining Society Vol 42. Na8.198
The method shown in 8P812-p816'
This prevents color moiré by ensuring sufficient performance of Y/C separation, and there is no particular problem in self-recording and playback. This was not done and there was a problem.
本発明の目的は、ＰＡＬ方式ＶＴＲにおいて解像度４０
０本以上を実現するとともにＹ／Ｃ分離の不十分さによ
り発生するカラーモアレを解決するＹ／Ｃ分離回路を低
コストで実現することにある。An object of the present invention is to provide a PAL VTR with a resolution of 40
The object of the present invention is to realize at a low cost a Y/C separation circuit that achieves 0 or more lines and solves color moiré caused by insufficient Y/C separation.
上記目的は、記録時にＩＨ！！延線を用い、Ｙ／Ｃ分離
くし形フィルタを楕成し、０〜５Ｍ）Ｉｚまでの輝度信
号を抜き取り、再生時には記録時のＹ／Ｃ分離の性能に
応じ輝度信号処理回路内で↑ＳＣトラップを適宜ＯＮ１
０ Ｆ Ｆすることで達成できる。The above purpose is to use IH when recording! ! Using a wire extension, a Y/C separation comb filter is formed into an ellipse, and the luminance signal from 0 to 5M) Iz is extracted. During playback, the luminance signal processing circuit converts ↑SC according to the performance of Y/C separation during recording. Turn on the trap appropriately
This can be achieved by 0 FF F.
上記Ｙ／Ｃ分離回路は、カラーモアレに対する問題解決
のために、記録時に７７０分離性能が十分か不十分かを
示すパイロタ１〜バースト信号を付加し、再生時に狭帯
域モード（Ｙ／Ｃ分離が不十分な場合で以下、Ｓ、モー
ドと称する）、広？ｆＦ域モード（Ｙ／Ｃ分離が十分な
場合で以下、Ｓ２モードと称する）を判別し、Ｓｉモー
ドの時は、１８ｃトラツプを挿入し、Ｓ２モードの時は
、ｆｓｃトラップを挿入しないように動作する。それに
よって、ＶＴＲへの入力がＹ／Ｃ分離入力の場合。In order to solve the problem of color moiré, the above Y/C separation circuit adds a pilot 1~burst signal that indicates whether the 770 separation performance is sufficient or insufficient during recording, and a narrowband mode (Y/C separation is (hereinafter referred to as S mode), wide? Determines fF range mode (hereinafter referred to as S2 mode when Y/C separation is sufficient), inserts an 18c trap when in Si mode, and operates not to insert an fsc trap when in S2 mode. do. Therefore, if the input to the VTR is a Y/C separated input.
コンポジット入力に対し十分な性能を持つくし形フィル
タでＹ／Ｃを分離した場合において解像度劣化を防止す
るとともに、不十分なＹ／Ｃ分離で記録されたテープに
おける再生時のカラーモアレを防止する。To prevent resolution deterioration when Y/C is separated using a comb filter having sufficient performance for composite input, and to prevent color moiré during playback on a tape recorded with insufficient Y/C separation.
以下、本発明の実施例を第１図を用いて説明する。第１
図は、ＶＴＲの記録再生を示した図であり、１は輝度信
号と色信号を分離した状態で入力する入力端子（以下、
Ｓ入力端子と呼ぶ）、２はコンポジット信号人力−子、
３はＹ／Ｃ分は回路。Embodiments of the present invention will be described below with reference to FIG. 1st
The figure shows the recording and playback of a VTR, and 1 is an input terminal (hereinafter referred to as
(referred to as the S input terminal), 2 is a composite signal input terminal,
3 is the Y/C circuit.
６は記録輝度信号処理回路（以下、記録Ｙ処理回路と称
す）、７は記録カラー信号処理回路（以下、記ｔｈ１Ｃ
処理回路と称す）、８はパイロットバースト信号付加回
路、９．２０は加算器、１０．１２は磁気ヘッド、１１
は磁気テープ、１３は再生輝度信号処理回路（以下、再
生Ｙ処理回路と称す）。6 is a recording luminance signal processing circuit (hereinafter referred to as a recording Y processing circuit); 7 is a recording color signal processing circuit (hereinafter referred to as th1C)
(referred to as a processing circuit), 8 is a pilot burst signal addition circuit, 9.20 is an adder, 10.12 is a magnetic head, 11
13 is a magnetic tape, and 13 is a reproduction brightness signal processing circuit (hereinafter referred to as reproduction Y processing circuit).
１５は再生カラー信号処理回路（以下、再生Ｃ処理回路
と称す）、１４はＩＨ遅延回路、１６は隣接妨害除去用
のクロマくし形フィルタ、１７↑Ｓｃトラツプ、１８は
パイロットバースト信号のモード判別回路、２１は輝度
信号と色信号を分離した状態で出力する端子（以下、Ｓ
出力端子と呼ぶ）、２２はコンポジット信号出力端子を
示す、記録時、コンポジット信号入力端子２に入力され
たコンポジットビデオ信号は、Ｙ／Ｃ分離回路３で輝度
信号とクロマ信号に分離される６分離された信号は、各
々記録Ｙ処理回路６及び記録Ｃ処理回路７で処理されて
、加算器９で加算され、磁気ヘッド１０に信号を供給し
磁気テープ１１に記録される。Ｓ入力端子から入力され
た信号についても、スイッチ４及びスイッチ５を通して
、同様の処理を行なう、上記処理を行なう際に、ＰＡＬ
方式用５−ＶＨ８規格に基づいて、パイロットバースト
信号付加図Ｎ８によりパイロットバースト信号を付加す
る。このパイロットバースト信号は、２種類のモードに
区分される。１．２Ｍ）Ｉｚ付近に変換記録される輝度
信号が色信号に対して２０ｄＢ以上減衰していない場合
は狭帯域モード（以下Ｓ１モードと呼ぶ）であり、２０
ｄＢ以上減衰している場合は広帯域モード（以下Ｓ、モ
ードと呼ぶ）である。15 is a reproduction color signal processing circuit (hereinafter referred to as reproduction C processing circuit), 14 is an IH delay circuit, 16 is a chroma comb filter for removing adjacent interference, 17 is a ↑Sc trap, and 18 is a pilot burst signal mode discrimination circuit. , 21 is a terminal (hereinafter referred to as S) that outputs the luminance signal and color signal in a separated state.
22 indicates a composite signal output terminal. During recording, the composite video signal input to the composite signal input terminal 2 is separated into a luminance signal and a chroma signal by a Y/C separation circuit 3. The resulting signals are processed by a recording Y processing circuit 6 and a recording C processing circuit 7, and are added together by an adder 9, and the signals are supplied to a magnetic head 10 and recorded on a magnetic tape 11. Similar processing is performed on the signal input from the S input terminal through switch 4 and switch 5.
Based on the 5-VH8 standard for the system, a pilot burst signal is added using a pilot burst signal addition diagram N8. This pilot burst signal is classified into two types of modes. 1.2M) If the luminance signal converted and recorded near Iz is not attenuated by 20dB or more with respect to the color signal, it is narrowband mode (hereinafter referred to as S1 mode), and 20
If it is attenuated by dB or more, it is a broadband mode (hereinafter referred to as S mode).
すなわち、Ｙ／Ｃ分離が十分に行なわれていない場合は
Ｓ８モード、Ｙ／Ｃ分離が十分に行なわれている場合は
Ｓ、モードとなる。再生時、磁気ヘッド１２から再生さ
れた信号を輝度信号とクロマ信号とに分離した後、各々
再生Ｙ処理回路１３゜再生Ｃ処理回路１５で処理し、そ
の後、クロマ信号は、隣接妨害除去用のクロマーク、シ
形フィルタ１６を通す、ここで、クロマくし形フィルタ
による輝度信号とクロマ信号の重心ずれについて第６図
を用いて説明する。クロマ信号（Ｖｃ）と２ Ｈ遅延し
たクロマ信号（Ｖａｎ）を用いてクロマくし形フィルタ
を構成しその出力信号（Ｆ）を得ると、輝度信号（Ｖｃ
）に対し２Ｈずれる（輝度信号の重心４６とクロマくし
形フィルタ出力信号の重心４７との重心ずれはＩＨ）、
記録Ｙ／Ｃ分離回路にくし形フィルタを用いると上記に
示した如くクロマ信号の重心が１１（ずれる、壱こで、
再生時に。That is, if the Y/C separation is not sufficiently performed, the S8 mode is selected, and if the Y/C separation is sufficiently performed, the S mode is selected. During reproduction, the signal reproduced from the magnetic head 12 is separated into a luminance signal and a chroma signal, and then processed by the reproduction Y processing circuit 13 and the reproduction C processing circuit 15, and then the chroma signal is processed by the reproduction Y processing circuit 13 and the reproduction C processing circuit 15. The chroma mark is passed through the square-shaped filter 16. Here, the shift in the center of gravity of the luminance signal and chroma signal due to the chroma comb-shaped filter will be explained using FIG. When a chroma comb filter is constructed using the chroma signal (Vc) and the chroma signal (Van) delayed by 2H and its output signal (F) is obtained, the luminance signal (Vc
) (the center of gravity shift between the center of gravity 46 of the luminance signal and the center of gravity 47 of the chroma comb filter output signal is IH),
When a comb filter is used in the recording Y/C separation circuit, the center of gravity of the chroma signal shifts by 11 points, as shown above.
when playing.
再生Ｙ処理回路１３の出力信号にＩＨ遅延回路（２Ｈ遅
延回路で゛ちよレリを通すことにより、クロマくし形フ
ィルタによるＩＨの重心ずれを積極的に防ぐことにする
０次に、クロマくし形フィルタを通したクロマ信号に対
し、記録時に付加したパイロットバースト信号の各モー
ドをモード判別回路１８で判別し、制御パルスＣＭ）を
発生させ。By passing the output signal of the reproduction Y processing circuit 13 through an IH delay circuit (2H delay circuit), a 0-order chroma comb filter is used to actively prevent the IH center of gravity shift caused by the chroma comb filter. The mode discrimination circuit 18 discriminates each mode of the pilot burst signal added at the time of recording with respect to the chroma signal passed through the chroma signal, and generates a control pulse (CM).
それにより、スイッチ１９の切り替えを行ないｔ ｓｃ
トラップ（ＬＰＦでもよい）の挿入、非挿入を決定す
る。最後に、そのスイッチ１９を通った再生輝度信号と
、クロマくし形フ・イルタを通った再生クロマ信号を加
算Ｉａ２０で加算し、出力端子２２より出力する。また
、スイッチ１９の出力及びクロマくし形フィルタ出力は
、直接Ｓ出力端子２１からも出力できる。As a result, the switch 19 is switched and t sc
Determines whether to insert a trap (LPF may be used). Finally, the reproduced luminance signal that has passed through the switch 19 and the reproduced chroma signal that has passed through the chroma comb filter are added by an adder Ia 20 and outputted from an output terminal 22. Further, the output of the switch 19 and the chroma comb filter output can also be output directly from the S output terminal 21.
ここで、モード判別回路１８から出力されるモード判別
信号（Ｍ）により制御されるスイッチ１９の動作及びそ
の効果について詳しく説明する。Here, the operation of the switch 19 controlled by the mode discrimination signal (M) output from the mode discrimination circuit 18 and its effects will be explained in detail.
パイロットバースト信号としては、前述した通りであり
、そのモードをモード判別回路で判別する。The pilot burst signal is as described above, and its mode is determined by a mode determining circuit.
具体的に述べれば、ＬＰＦ （または、Ｌｓｃトラップ
）とＢＰＦでのＹ／Ｃ分離を行なった際に７７０分離性
能が不十分な場合、もしくは、７７０分離性能が不十分
なくし形フィルタでＹ／Ｃ分離を行なった場合は、Ｓ４
モードとなり、Ｙ信号とＣ信号を独立にＳ端子から入力
した場合及び７７０分離性能が十分なくし形フィルタで
Ｙ／Ｃ分離を行なった場合は、Ｓ２モードになる。従っ
てＳ、モードにおいては、カラーモアレが発生し、Ｓ２
モードにおいては１発生しない０次に、第３図、第４図
を用いてカラーモアレについて再度説明する。Specifically, when 770 separation performance is insufficient when performing Y/C separation with LPF (or Lsc trap) and BPF, or when Y/C separation is performed using a comb filter with insufficient 770 separation performance. If separation is performed, S4
mode, and when the Y signal and C signal are input independently from the S terminal, or when Y/C separation is performed using a comb filter with sufficient 770 separation performance, the mode becomes S2 mode. Therefore, in S mode, color moiré occurs, and S2
Color moiré will be explained again with reference to FIGS. 3 and 4.
記録時、入力端子２８に入力されたコンポジットビデオ
信号は、Ｙ／Ｃ分離回路２９で輝度信号とクロマ信号に
分離される０分離された信号は。During recording, a composite video signal input to the input terminal 28 is separated into a luminance signal and a chroma signal by a Y/C separation circuit 29. A zero-separated signal is generated.
各々、ｊＩ＃１度信号処理及び、クロマ信号処理されて
。Each signal is processed by jI#1 degree signal processing and chroma signal processing.
加算器３０で加算され、磁気ヘッド３１より磁気テープ
３２上に記録される（例えば、家庭用ＶＴＲでは、ＦＭ
変調した輝度信号と低域変換したクロマ信号を周波数多
重し記録する）、再生時は、磁気ヘッド３３から再生さ
れた信号を輝度信号とクロマ信号に分離し、各々、再生
Ｙ処理回路３４、再生Ｃ処理回路３５で処理し、その後
、加算器３６で加算した後モニタ３７に出力する。その
際、記録時に輝度信号中に取り残されたクロマ成分は、
再生時に再生Ｙ処理回路３４で処理される一方クロマ信
号は、再生時に再生Ｃ処理回路３５中にＡＰＣ回路で位
相ロックされるために、第４図に示すが如く輝度信号Ｙ
中の残留クロマ信号Ｃ′と再生クロマ信号Ｃとが、相互
に干渉しビート妨害を起こす、このビート妨害がカラー
モアレである。従って、上述したＳ２モードの場合は、
残留クロマ成分が多いため、カラーモアレが発生するわ
けである。そこで、再生時において、モード判別回路１
８は、Ｓ０モードで記録されたテープか、Ｓ３モードで
記録されたテープかを判別し。They are added by an adder 30 and recorded on a magnetic tape 32 by a magnetic head 31 (for example, in a home VTR, FM
During reproduction, the signal reproduced from the magnetic head 33 is separated into a luminance signal and a chroma signal, and each is sent to the reproduction Y processing circuit 34 and the reproduction The C processing circuit 35 processes the signals, and then the adder 36 adds the signals and outputs them to the monitor 37 . At that time, the chroma components left behind in the luminance signal during recording are
On the other hand, the chroma signal processed by the reproduction Y processing circuit 34 during reproduction is phase-locked by the APC circuit in the reproduction C processing circuit 35 during reproduction, so that the luminance signal Y is processed as shown in FIG.
The residual chroma signal C' and the reproduced chroma signal C interfere with each other and cause beat disturbance, and this beat disturbance is called color moiré. Therefore, in the case of S2 mode mentioned above,
Color moiré occurs because there are many residual chroma components. Therefore, during playback, the mode discrimination circuit 1
8 determines whether the tape was recorded in S0 mode or S3 mode.
Ｓユモードの時は、例えば、Ｈｉｇｈレベルの制御パル
スを発生しスイッチ１９をＨ側に接続させ輝度信号に対
して、ｔ ｓｃ トラップ１７が挿入されるように働き
、Ｓ３モードの時は、Ｌｏｗレベルの制御パルスを発生
しスイッチ１９をＬ側に接続させｔ ｓｃ トラップ１
７を挿入しないように働く。In the S mode, for example, a high level control pulse is generated and the switch 19 is connected to the H side, so that the t sc trap 17 is inserted into the luminance signal, and in the S3 mode, a low level control pulse is generated. generates a control pulse and connects the switch 19 to the L side t sc trap 1
Works to avoid inserting 7.
以上より、本発明は、第１図のモード判別回路１８より
発生するｓｉ（狭帯域）モード、Ｓ、（広帯域）モード
判別パルスによりｔ ｓｃ トラップを切り替えて８２
モ一ド時の４００本以上の高解像度を実現し、Ｓ８モ一
ド時のカラーモアレを防止するものである。この時、Ｓ
、モードでは、記録時にもともと解像度劣化を招いてい
るため、ｔｓｃトラップを挿入しても特に大きな問題に
はならない。As described above, the present invention switches the t sc trap using the si (narrow band) mode, S, (broad band) mode discrimination pulse generated by the mode discrimination circuit 18 in FIG.
It achieves a high resolution of more than 400 lines in mode and prevents color moiré in S8 mode. At this time, S
, mode, since resolution degradation is originally caused during recording, inserting a tsc trap does not pose a particular problem.
以下、第７図を用いて本発明の他の実施例を説明する。Another embodiment of the present invention will be described below with reference to FIG.
第７図は、第１図におけるＹ／Ｃ分離回路３として第５
図に示したくし形フィルタを用いた場合であり、５１．
５２は１１（遅延線、５６はイコライザー、５７．６４
はＢＰＦ、６１は減衰器、６２はリミッタを示す、記録
時、コンポジットビデオ信号が入力端子２に入力される
とスイッチ４８．４９がα側に接続されその信号がＹ／
Ｃ分離回路を通ることになる０次に、α側に接続された
スイッチ５０を通り第５図で示したくし形フィルタを用
いてＹ／Ｃ分離を行なう、なお、第５図における２Ｈ遅
延線３９が、第７図におけるＬ Ｈ遅延線５１と５２に
あたり、また、スイッチ５３は記録時α側に接続される
。その後、輝度信号は、ｂ側に接続されたスイッチ５８
及びα側に接続さ九たスイッチェ９を通り記録Ｙ処理回
路６を経て磁気ヘッド１０より磁気テープ１１に記録さ
れる１色信号は、α側に接続されたスイッチ６５を通り
記録Ｃ処理回路７を経て輝度信号と同様に記録される。FIG. 7 shows a fifth Y/C separation circuit 3 in FIG.
This is the case where the comb filter shown in the figure is used, and 51.
52 is 11 (delay line, 56 is equalizer, 57.64
is a BPF, 61 is an attenuator, and 62 is a limiter. During recording, when a composite video signal is input to input terminal 2, switches 48 and 49 are connected to the α side, and the signal is input to Y/
0, which passes through the C separation circuit, then passes through the switch 50 connected to the α side and performs Y/C separation using the comb filter shown in FIG. 5. Note that the 2H delay line 39 in FIG. corresponds to the LH delay lines 51 and 52 in FIG. 7, and the switch 53 is connected to the α side during recording. Thereafter, the brightness signal is transmitted to the switch 58 connected to the b side.
The one-color signal that is recorded on the magnetic tape 11 from the magnetic head 10 via the recording Y processing circuit 6 through the switch 9 connected to the α side passes through the recording C processing circuit 7 through the switch 65 connected to the α side. The signal is recorded in the same way as the luminance signal.
Ｓ端子１より入力された場合には、Ｙ／Ｃ分離回路を通
らずにそのまま、それぞれ記録Ｙ処理回路６及び記録Ｃ
処理回路７を経て記録される。すなわち、輝度信号は、
順にｂ側に接続されたスイッチ４８．α側に接続され九
スイッチ４９，５０，５３．ｄｅｌａｙ ＥＱ５６．ａ
側に接続されたスイッチ５８，１９を通り、クロマ信号
は、順にα側に接続されたスイッチ６３、ＢＰＦ６４、
ｂ側に接続されたスイッチ６５を通る。When the input is from the S terminal 1, it is directly sent to the recording Y processing circuit 6 and recording C without passing through the Y/C separation circuit.
The data is recorded via the processing circuit 7. That is, the luminance signal is
The switch 48. which is connected to the b side in turn. Nine switches 49, 50, 53 connected to the α side. delay EQ56. a
The chroma signal passes through the switches 58 and 19 connected to the α side, and then passes through the switch 63, BPF 64, and BPF 64 connected to the α side in order.
It passes through the switch 65 connected to the b side.
パイロットバースト信号は、記録Ｃ処理回路７に付随す
る形で記録される。再生時、磁気テープ１１より磁気ヘ
ッド１２を用いて取り出されたビデオ信号は、各々、再
生Ｙ処理圏＃ｓ１３及び再生Ｃ処理回路１５を通る。そ
の後、再生輝度信号は。The pilot burst signal is recorded in a manner associated with the recording C processing circuit 7. During playback, video signals extracted from the magnetic tape 11 using the magnetic head 12 pass through the playback Y processing zone #s13 and the playback C processing circuit 15, respectively. After that, the reproduced luminance signal is.
ｂ側に接続されたスイッチ４９を通り、減算器５４．６
０及び、ｂ側に接続されたスイッチ５０、ＩＨ遅延線５
１、リミッタ６２、減衰器６１を用いて構成されるＹ−
ＮＲ（以下、輝度ラインノイズリデューサをＹ−ＮＲと
称す）をかいし、ｂ側に接続されたスイッチ５３． ｄ
ｅｌａｙ ＥＱ５６．ａ側に接続されたスイッチ５８を
通過する。なお。through the switch 49 connected to the b side, and the subtractor 54.6
0 and the switch 50 connected to the b side, and the IH delay line 5
1, Y- configured using limiter 62 and attenuator 61
NR (hereinafter, the luminance line noise reducer will be referred to as Y-NR), and a switch 53 connected to the b side. d
elay EQ56. It passes through the switch 58 connected to the a side. In addition.
Ｙ−ＮＲはノイズ低減を目的とする回路である。Y-NR is a circuit whose purpose is to reduce noise.
スイッチ５８を通った信号は、モード判別回路１８より
得られる制御パルスにより、↑ｓｃトラップ１７を挿入
または非挿入を決定しＳ出力端子２１より出力される。The signal passed through the switch 58 determines whether to insert or not insert the ↑sc trap 17 according to a control pulse obtained from the mode discrimination circuit 18, and is output from the S output terminal 21.
再生クロマ信号は、隣接妨害除去用のクロマくし形フィ
ルタ１６を通りさらにｂ側に接続されたスイッチ６３及
びＢＰＦ６４、ｂ側に倒れたスイッチ６５を通りＳ出力
端子２１より出力される。また、加算器２０より、再生
輝度信号と再生クロマ信号を、加算しコンポジット信号
出力端子２２より出力することもできる。The reproduced chroma signal passes through the chroma comb filter 16 for removing adjacent interference, further passes through the switch 63 and BPF 64 connected to the b side, and the switch 65 turned to the b side, and is output from the S output terminal 21. Further, the adder 20 can add the reproduced luminance signal and the reproduced chroma signal and output the result from the composite signal output terminal 22.
上記回Ｉ４楕成にしたことで、記録時にＩＨ遅延線を２
個用いてくし形フィルタを構成しＹ／Ｃ分離を行ない、
さらに、パイロットバースト信号を付加する。再生時は
、Ｙ−ＮＲを構成し、かつＬ Ｈ遅延１１Ａ５１を用い
て輝度信号をＩＨ遅延させる。そして、カラーモアレを
防ぐために、モード判別回路より得られた判別パルスを
用いて、↑８Ｇトラップ（ＬＰＦでもよい）を第１図で
説明した如く適宜切り替える。By setting the I4 ellipse to the above, the IH delay line was set to 2 when recording.
They are used to form a comb filter and perform Y/C separation.
Furthermore, a pilot burst signal is added. During reproduction, Y-NR is configured and the luminance signal is delayed by IH using the LH delay 11A51. Then, in order to prevent color moiré, the ↑8G trap (LPF may be used) is appropriately switched as explained in FIG. 1 using the discrimination pulse obtained from the mode discrimination circuit.
次に、他の実施例を第８図を用いて説明する。Next, another embodiment will be described using FIG. 8.
第８図は、第７図で示した実施例の５１〜５３゜５５〜
５９で構成されるＹ／Ｃ分離くし形フィルタを別の方法
で実現したものである。記録時、第７図と同様の経路で
入力されたコンポジットビデオ信号は、ＩＨ遅延線５１
．５２を通った信号と現信号を加算器６６で加算するこ
とにより輝度信号を分離しく輝度くし形フィルタ）減算
器７１で減算することによりクロマ信号を分離する（ク
ロマくし形フィルタ）、この時、遅延線５１．５２は、
ＣＣＤ （Ｃｈａｒｇｅｄ Ｃｏｕｐｌｅｄ Ｄｅｖｉ
ｃｅ ）等の遅延素子であり、直流成分から交流まで通
す、したがって、加算器６６の出力は、低域から高域ま
で全帯域でくし特性を示す、したがって、輝度くし形フ
ィルタの出力にクロマくし形フィルタの低域成分を加算
し、クロマ帯域のみくし特性にする必要がある。そこで
、輝度信号の低域を補間するために減算器７１の出力の
低域成分をＬＰＦ６９で抜き取り、加算器７０で輝度く
し形フィルタ出力（加算器６６出力）に加算する。その
時、スイッチ６７はＣ側に接続される。その他は、第７
図と同様である。FIG. 8 shows the 51-53°55-
This is a Y/C separation comb filter composed of 59 elements realized by another method. During recording, a composite video signal input through a path similar to that shown in FIG.
．． The signal passed through 52 and the current signal are added in an adder 66 to separate the luminance signal (luminance comb filter).The subtracter 71 separates the chroma signal (chroma comb filter). The delay lines 51 and 52 are
CCD (Charged Coupled Device)
ce), which passes from the DC component to the AC. Therefore, the output of the adder 66 exhibits comb characteristics in the entire band from low to high frequencies. It is necessary to add the low-frequency components of the shaped filter to obtain a chroma band combing characteristic. Therefore, in order to interpolate the low frequency range of the luminance signal, the low frequency component of the output of the subtracter 71 is extracted by the LPF 69 and added to the luminance comb filter output (output of the adder 66) by the adder 70. At that time, switch 67 is connected to the C side. Others are the 7th
It is similar to the figure.
次に、他の実施例を第９図を用いて説明する。Next, another embodiment will be described using FIG. 9.
第９図は、第７図で示した実施例に相関検出回路７４（
ライン毎の非相関部を検出しドツトと除去する技術を実
現する回路）と論理回路７５を加えたものである。記録
時に、相関検出回路７４を用いて相関検出パルスを発生
させて、ドツトを除去するためにｔｓｃトラップを切り
替える。その際。FIG. 9 shows a correlation detection circuit 74 (
This circuit includes a logic circuit 75 and a circuit for realizing a technique for detecting and eliminating uncorrelated portions on a line-by-line basis. During recording, correlation detection circuit 74 is used to generate a correlation detection pulse to switch the tsc trap to remove dots. that time.
再生時にカラーモアレを防ぐために用いた↑８ｃトラッ
プ１７と兼用化する。すなわち、記録時の相関検出パル
スと再生時のモード判別回Ｍ１８より発生するモード判
別パルスを論理回路７５を用いて制御しｔａｃトラップ
１７を適宜切り替える。その他は、第７図と同様である
。It is also used as the ↑8c trap 17 used to prevent color moiré during playback. That is, the correlation detection pulse during recording and the mode discrimination pulse generated from the mode discrimination circuit M18 during reproduction are controlled using the logic circuit 75, and the tac trap 17 is switched as appropriate. Others are the same as in FIG. 7.
次に他の実施例を第１０図、“第１１図を用いて説明す
る。第１０図は、ＶＴＲの記録再生を示した図であり、
７６はプリアンプ、７７はバイパスフィルタ（以下、Ｈ
ＰＦと略記）、７８はＬＰＦ。Next, another embodiment will be explained with reference to FIGS. 10 and 11. FIG. 10 is a diagram showing recording and reproduction of a VTR.
76 is a preamplifier, 77 is a bypass filter (hereinafter referred to as H
(abbreviated as PF), 78 is LPF.
７９はＦＭ等化回路、８０は、トラップ回路、８１は、
スイッチ回路、８２はＦＭ等化回路。79 is an FM equalization circuit, 80 is a trap circuit, 81 is
A switch circuit, 82 is an FM equalization circuit.
８３は再生Ｙ処理回路、８４はＩＨ遅延回路、８５は再
生Ｃ処理回路、８６は隣接妨害除去用のクロマくし形フ
ィルタ、８７はモード判別回路。83 is a reproduction Y processing circuit, 84 is an IH delay circuit, 85 is a reproduction C processing circuit, 86 is a chroma comb filter for removing adjacent interference, and 87 is a mode discrimination circuit.
８８は加算器を示す、記録時は、第１図と同様の動作を
する。Reference numeral 88 denotes an adder, which operates in the same manner as in FIG. 1 during recording.
まず、第１１図について説明する。一般に家庭用ＶＴＲ
においては、クロマ信号は低域変換し。First, FIG. 11 will be explained. Generally home VTR
In this case, the chroma signal is converted to low frequency.
輝度信号はＦＭ変調し、周波数多重して磁気テープ上に
記録している。第１１図は、磁気テープ上に記録される
信号スペクトラムを示したものである。８９は低域変換
クロマｔ８号、９０はＦＭｊ１度信号である。記録時の
Ｙ／Ｃ分離が不十分な場合輝度信号中に取れ残ったクロ
マ成分は、１７ Ｍ変調されて下側波帯中のｆｃ−ｔｓ
ｃ中心の周波数帯域に存在する残留クロマ成分９１（以
下、下側波帯の残留クロマ成分と称す）及び、上側波帯
中のｆｃ＋ｔｓｃ中心の周波数帯域に存在す残留クロマ
成分９２（以下、上側波帯の残留クロマ成分と称す）と
なる、ここで、ｔｃは、Ｉ？ Ｍキャリアの中心周波数
を意味する。再生されたＦＭ輝度信号が、再びＩ” Ｍ
復調されると、ＦＭ帯に存在する残留クロマ成分９１，
９２は、↑ｓｃ帯域の残留クロマ成分となり再生クロマ
信号と加算後ゼロビートを起こしカラーモアレが発生す
る。そこで−トラップ回路８０を用いて残留クロマ成分
を除去する。テープ、ヘッド系の性格上、上側波帯の残
留クロマ成分９２は、下側波帯の残留クロマ成分９１よ
りもレベルが低下する。即ち、スペーシングロス等によ
り高周波成分の再生レベルが低下するからである。した
がって、上側波帯の残留クロマ成分９２は、再生カラー
モアレの発生原因としては。The luminance signal is FM modulated, frequency multiplexed, and recorded on the magnetic tape. FIG. 11 shows a signal spectrum recorded on a magnetic tape. 89 is a low frequency conversion chroma t8, and 90 is an FMj 1 degree signal. If the Y/C separation during recording is insufficient, the chroma component remaining in the luminance signal is modulated by 17M and sent to the fc-ts in the lower sideband.
A residual chroma component 91 existing in the frequency band centered on c (hereinafter referred to as the residual chroma component of the lower sideband) and a residual chroma component 92 existing in the frequency band centered on fc+tsc in the upper sideband (hereinafter referred to as the upper sideband) (referred to as the residual chroma component of the band), where tc is I? M means the center frequency of the carrier. The reproduced FM luminance signal is again I”M
When demodulated, residual chroma components 91 existing in the FM band
92 becomes a residual chroma component in the ↑sc band, and after being added to the reproduced chroma signal, zero beat occurs and color moiré occurs. Therefore, the -trap circuit 80 is used to remove the residual chroma component. Due to the characteristics of the tape and head system, the residual chroma component 92 in the upper sideband has a lower level than the residual chroma component 91 in the lower sideband. That is, this is because the reproduction level of high frequency components decreases due to spacing loss and the like. Therefore, the residual chroma component 92 in the upper sideband is the cause of reproduced color moiré.
下側波帯の残留クロマ成分９１程大きなものではない、
したがって、この実施例では、下側波帯の残留クロマ成
分９１にのみトラップ回路８０を挿入しているが、上側
波帯の残留クロマ成分９２に対しトラップ回路８０を挿
入することもこの実施例の簡略である。プリアンプ７６
で十分増幅された再生信号は、ＨＰ Ｆ ７７とＬＰＦ
７８を用いて。It is not as large as the residual chroma component 91 in the lower sideband.
Therefore, in this embodiment, the trap circuit 80 is inserted only for the residual chroma component 91 in the lower sideband, but it is also possible to insert the trap circuit 80 for the residual chroma component 92 in the upper sideband. It is simple. Preamplifier 76
The playback signal that has been sufficiently amplified is the HP F 77 and LPF
Using 78.
ＦＭ輝度信号９０と低域変換クロマ信号８９に分離され
る。その後、ＦＭ輝度信号はＦＭ等化回路７９を経て、
第１図に示すモード判別回路８７より発生する制御パル
スより、Ｓ、モードの時は。It is separated into an FM luminance signal 90 and a low frequency converted chroma signal 89. After that, the FM luminance signal passes through the FM equalization circuit 79.
According to the control pulse generated by the mode discrimination circuit 87 shown in FIG. 1, when the mode is S.
スイッチａｉｅｂ側に接続し、Ｓ、モードの時は、α側
に接続する。そして、ＦＭ復調回路８２を含めた再生Ｙ
処理回路８３を通り、その後、第１図と同様の経路を通
る。ＬＰＦ７８により分離された低域変換クロマ信号８
９については、第１図と同様の経路である。上記の如く
、この実施例は。Connect to the aieb side of the switch, and connect to the α side when in S mode. Then, the reproduction Y including the FM demodulation circuit 82
It passes through the processing circuit 83 and then follows the same route as in FIG. Low frequency converted chroma signal 8 separated by LPF78
9 is the same route as in FIG. As mentioned above, this embodiment.
ＦＭ輝度信号中の残留クロマ成分に対しトラップを挿入
することを特徴とする特
次に、第１２図を用いて他の実施例を説明する。Another embodiment will be described with reference to FIG. 12, which is a special feature characterized by inserting a trap for residual chroma components in an FM luminance signal.
第１２図は、第１図の実施例中のモード判別回路１８を
表した図である。９３は、第１図のモード判別回路１８
と同じ動作をする自動モード判別回路であり、９４は、
マニュアルで制御しモードを決定する回路（以下１手動
判別回路と称す）であり、９５は、論理回路である。自
動判別回路以外は、第１図と同様であり同様の動作をす
る。自動判別回路９３により狭帯域モード（ｓｉモード
）と広帯域モード（ｓｉモード）を判別し、パルスを発
生させる。さらに、手動判別回路９４を用いて強制的に
手動で判別パルスを発生させ、論理回路９５で上記２つ
のパルスを演算処理し、新たに制御パルス（Ｎ）を発生
させｔ ｓｃ トラップ１７を挿入するか、挿入しない
かを決定する。上記の如く、この実施例は、ｆｓｃトラ
ップの挿入、非挿入を決定する制御パルスを発生させる
ために、第１図で示した自動判別回路９３と、外部より
手動で切り替えることができる手動判別回路９４を用い
。FIG. 12 is a diagram showing the mode discrimination circuit 18 in the embodiment of FIG. 1. 93 is the mode discrimination circuit 18 in FIG.
94 is an automatic mode discrimination circuit that operates in the same way as
This is a circuit for manually controlling and determining the mode (hereinafter referred to as 1 manual discrimination circuit), and 95 is a logic circuit. Components other than the automatic discrimination circuit are the same as in FIG. 1 and operate in the same manner. The automatic discrimination circuit 93 discriminates between narrowband mode (si mode) and wideband mode (si mode) and generates a pulse. Furthermore, the manual discrimination circuit 94 is used to forcibly generate a discrimination pulse manually, the logic circuit 95 processes the above two pulses, generates a new control pulse (N), and inserts the t sc trap 17. Decide whether to insert it or not. As described above, this embodiment uses the automatic discrimination circuit 93 shown in FIG. Use 94.
その２つの信号を論理演算することに特徴がある。The feature is that the two signals are subjected to logical operations.
本発明は、再生時のｆｓｃトラップの適宜切り替えによ
り広帯域モード（Ｓ２モード）時の高解像度を実現しつ
つ、狭帯域モード（ＳＺモード）時におけるカラーモア
レを防止するものである。また、ＦＭ輝度信号中の残留
クロマ成分に対し上記と同様にトラップの適宜切り替え
を行ないカラーモアレを防止するものである。The present invention prevents color moiré in narrowband mode (SZ mode) while achieving high resolution in wideband mode (S2 mode) by appropriately switching fsc traps during playback. Furthermore, traps are appropriately switched for residual chroma components in the FM luminance signal in the same way as described above to prevent color moiré.
なお、本実施例中のＩＨ遅廷線としては、ＣＣＤ （ｃ
ｈａｒｇｅｄ ｃｏｕｐｌｅｄ ｄｅｖｉｃｅ）及びラ
インメモリ（ディジタルメモリ）等で実現できる。In addition, as the IH delay line in this example, CCD (c
This can be realized using a harged coupled device), a line memory (digital memory), etc.
本発明によれば、記録時、Ｙ／Ｃ分離の不十分な場合（
狭帯域モード）とＹ／Ｃ分離の十分な場合（広帯域モー
ド）の違いによりパイロットバースト信号を付加し、再
生時、その信号のモードを判別することができる回路を
持つＶ Ｔ Ｒにおいて、その判別回路より制御パルス
を発生させて、↑ｓｃトラップの適宜切り替えを行ない
、広帯域モードでは、４００本以上の高解像度を実現し
、狭帯域モードでは、記録Ｙ／Ｃ分離が不十分なために
発生するカラーモアレを防止できる効果がある。According to the present invention, when Y/C separation is insufficient during recording (
A pilot burst signal is added depending on the difference between (narrowband mode) and when Y/C separation is sufficient (wideband mode), and the VTR has a circuit that can distinguish the mode of the signal during playback. A control pulse is generated from the circuit to switch the ↑sc trap as appropriate, and in wideband mode, a high resolution of 400 lines or more is achieved, while in narrowband mode, this occurs due to insufficient recording Y/C separation. It has the effect of preventing color moiré.
また、。記録時のＹ／Ｃ分離くし形フィルタに用いる遅
延線を再生時のＹ−ＮＲ（輝度ラインノイズリデューサ
）、ＩＨ遅延回路に用いることで、コスト低減を実現で
きる効果もある。Also,. By using the delay line used in the Y/C separation comb filter during recording in the Y-NR (luminance line noise reducer) and IH delay circuit during reproduction, it is possible to reduce costs.
第１図、第１０図は本発明の一実施例のブロック図、第
２図、第５図は、Ｙ／Ｃ分離ブロック図。
第３図はＶＴＲの記録再生系ブロック図、第４図は、カ
ラーモアレ発生要因図、ｆＪ４Ｂ図は、再生時における
クロマくし形フィルタによるＹ／Ｃ重心ずれを表した図
、第７図、第８図、第９図は本発明を実現する一具体例
のブロック図、第１１図は、ＦＭｊ１度信号中の残留ク
ロマ成分を表した図である。
８・・・パイロットバースト信号付加回路、１４・・・
ＩＨ遅延回路、
１６・・・クロマくし形フィルタ。
１７・・・ｔ ｇｃ トラップ。
１８・・・パイロットバースト信号のモード判別及びパ
ルス発生回路。
５１．５２・・・ＩＨＢ延線。
邪
肩
国
扇
？
口
邪
肥
高1 and 10 are block diagrams of an embodiment of the present invention, and FIGS. 2 and 5 are Y/C separation block diagrams. Fig. 3 is a block diagram of the recording/reproducing system of a VTR, Fig. 4 is a diagram showing the causes of color moiré, fJ4B is a diagram showing Y/C gravity center deviation due to the chroma comb filter during playback, Figs. 8 and 9 are block diagrams of a specific example of implementing the present invention, and FIG. 11 is a diagram showing residual chroma components in the FMj 1 degree signal. 8... Pilot burst signal addition circuit, 14...
IH delay circuit, 16...Chroma comb filter. 17...t gc trap. 18... Pilot burst signal mode discrimination and pulse generation circuit. 51.52...IHB line extension. Evil shoulder country fan? Bad mouth high
Claims (1)
波数多重されたコンポジットビデオ信号から輝度信号と
クロマ信号とを分離する分離回路と分離した上記輝度信
号とクロマ信号を磁気テープ上に記録する記録回路と、
分離後のクロマ信号よりクロマ信号中の残留輝度信号レ
ベルの大きな第１のモードと残留輝度レベルの小さな第
２のモードを判別する回路を用いて判別信号を記録回路
に付加する回路と前記磁気テープから再生された信号を
輝度信号とクロマ信号に分離し各々、再生処理する再生
回路を有するビデオテープレコーダにおいて、記録時に
付加した前記判別信号のモードを判別しそれに基づく制
御信号を発生させる回路を有し、かつ輝度信号とクロマ
信号を加算する以前の輝度信号に対し前記第１のモード
でクロマ信号を除去するトラップ回路を通過させ前記第
２のモードで前記トラップ回路を通過させないようなス
イッチ回路を有し、かつ前記スイッチ回路を前記制御信
号で制御することを特徴とするＹ／Ｃ分離回路。 ２、再生輝度信号処理回路に１水平周期遅延回路を設け
たことを特徴とする請求項１記載のＹ／Ｃ分離回路。 ３、記録時に、前記輝度信号とクロマ信号を分離する回
路を、２個の１水平周期遅延線を有するくし形フィルタ
で構成し、再生時に前記再生輝度信号処理回路中に設け
た１水平周期遅延回路を前記２個の１水平周期遅延線の
一方と兼用化することを特徴とする請求項２記載のＹ／
Ｃ分離回路。 ４、再生時に輝度ラインノイズリデューサー回路を前記
２個の１水平周期遅延線の一方で構成し、かつ前記１水
平周期遅延線の出力を取り出すことにより１水平周期遅
延回路を構成したことを特徴とする請求項３記載のＹ／
Ｃ分離回路。 ５、輝度信号とクロマ信号がインターリーブの関係で周
波数多重されたコンポジットビデオ信号から細度信号と
クロマ信号とを分離する分離回路と分離した上記輝度信
号とクロマ信号を磁気テープ上に記録する記録回路と、
分離後のクロマ信号よりクロマ信号中の残留輝度信号レ
ベルの大きな第１のモードと残留輝度レベルの小さな第
２のモードを判別する回路を用いて判別信号を記録回路
に付加する回路と前記磁気テープから再生された信号を
輝度信号とクロマ信号に分離し各々、ＦＭ変調信号を得
るＦＭ変調回路と、低域クロマ信号を得る低域変換回路
を有し、その出力を加算し周波数多重記録するビデオテ
ープレコーダにおいて、記録時に付加した前記判別信号
のモードを判別しそれに基づく制御信号を発生させる回
路を有し、再生ヘッドプリアンプで十分増幅された再生
ＦＭ輝度信号に対し、ＦＭ輝度信号のキャリア中心周波
数ｔｃからｔｓｃ（色副搬送波周波数）離れた（ｔｃ−
ｔｓｃ）に中心周波数を持つトラップ回路を有し、かつ
前記トラップ回路を前記第１のモードで通過させクロマ
信号を除去し、前記第２のモードで前記トラップ回路を
通過させないようなスイッチ回路を再生ヘッドプリアン
プの後段に有し、かつ前記スイッチ回路を前記制御信号
で制御することを特徴とするＹ／Ｃ分離回路。[Claims] 1. A separation circuit that separates the luminance signal and chroma signal from a composite video signal in which the luminance signal and chroma signal are frequency multiplexed in an interleaved relationship, and the separated luminance signal and chroma signal are recorded on a magnetic tape. a recording circuit that records on the
A circuit for adding a discrimination signal to a recording circuit using a circuit for discriminating between a first mode in which the residual luminance signal level is higher in the chroma signal and a second mode in which the residual luminance signal level is lower than the chroma signal after separation, and the magnetic tape. The video tape recorder has a reproduction circuit that separates a signal reproduced from a luminance signal into a luminance signal and a chroma signal, and reproduces each signal.The video tape recorder has a circuit that determines the mode of the discrimination signal added at the time of recording and generates a control signal based on the mode of the discrimination signal added at the time of recording. and a switch circuit that allows the luminance signal before adding the luminance signal and the chroma signal to pass through a trap circuit that removes the chroma signal in the first mode, and does not allow it to pass through the trap circuit in the second mode. and controlling the switch circuit with the control signal. 2. The Y/C separation circuit according to claim 1, wherein the reproduced luminance signal processing circuit is provided with a one horizontal period delay circuit. 3. During recording, the circuit for separating the luminance signal and chroma signal is configured with a comb filter having two 1-horizontal period delay lines, and during reproduction, a 1-horizontal period delay line provided in the reproduced luminance signal processing circuit is used. 3. The Y/R according to claim 2, wherein the circuit is also used as one of the two one-horizontal period delay lines.
C separation circuit. 4. A luminance line noise reducer circuit is configured at one of the two one-horizontal period delay lines during reproduction, and a one-horizontal period delay circuit is configured by taking out the output of the one-horizontal period delay line. Y/ according to claim 3
C separation circuit. 5. A separation circuit that separates a fineness signal and a chroma signal from a composite video signal in which the luminance signal and chroma signal are frequency multiplexed in an interleaved relationship, and a recording circuit that records the separated luminance signal and chroma signal on a magnetic tape. and,
A circuit for adding a discrimination signal to a recording circuit using a circuit for discriminating between a first mode in which the residual luminance signal level is higher in the chroma signal and a second mode in which the residual luminance signal level is lower than the chroma signal after separation, and the magnetic tape. A video system that separates the reproduced signal into a luminance signal and a chroma signal and obtains an FM modulated signal for each, and a low-frequency conversion circuit that obtains a low-frequency chroma signal, and adds the outputs and performs frequency multiplex recording. The tape recorder has a circuit that determines the mode of the discrimination signal added at the time of recording and generates a control signal based on the mode. tsc (color subcarrier frequency) away from tc (tc-
regenerating a switch circuit having a trap circuit having a center frequency at tsc), passing the trap circuit in the first mode to remove a chroma signal, and not allowing the trap circuit to pass in the second mode; A Y/C separation circuit, which is provided after a head preamplifier and controls the switch circuit with the control signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1004972A JP2690991B2 (en) | 1989-01-13 | 1989-01-13 | Y / C separation circuit |
| DE19904000790 DE4000790A1 (en) | 1989-01-13 | 1990-01-12 | Colour signal processor for PAL video tape recorder - has signal reproducer contg. separate luminance and chrominance signals, and identifying signal, to residual chrominance component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1004972A JP2690991B2 (en) | 1989-01-13 | 1989-01-13 | Y / C separation circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02186787A true JPH02186787A (en) | 1990-07-23 |
| JP2690991B2 JP2690991B2 (en) | 1997-12-17 |
Family
ID=11598513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1004972A Expired - Lifetime JP2690991B2 (en) | 1989-01-13 | 1989-01-13 | Y / C separation circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2690991B2 (en) |
| DE (1) | DE4000790A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5399675A (en) * | 1989-06-01 | 1995-03-21 | Pfizer Inc. | Acidic polycyclic ether antibiotics and microorganisms useful in the production thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4114605A1 (en) * | 1991-05-04 | 1992-12-03 | Telefunken Fernseh & Rundfunk | Compatible transmission of television signal mode additional information |
| DE4118673A1 (en) * | 1991-06-07 | 1992-12-10 | Thomson Brandt Gmbh | VIDEO RECORDER |
| EP0624042B1 (en) * | 1993-05-07 | 2000-08-09 | SONY DEUTSCHLAND GmbH | A television signal compatible with a conventional television standard signal, method of transmitting the television signal and equipment for processing the television signal |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4143397A (en) * | 1976-04-19 | 1979-03-06 | Rca Corporation | Comb filter apparatus |
| NL7803910A (en) * | 1978-04-13 | 1979-10-16 | Philips Nv | COMB FILTER CIRCUIT. |
-
1989
- 1989-01-13 JP JP1004972A patent/JP2690991B2/en not_active Expired - Lifetime
-
1990
- 1990-01-12 DE DE19904000790 patent/DE4000790A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5399675A (en) * | 1989-06-01 | 1995-03-21 | Pfizer Inc. | Acidic polycyclic ether antibiotics and microorganisms useful in the production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4000790A1 (en) | 1990-07-19 |
| DE4000790C2 (en) | 1992-02-20 |
| JP2690991B2 (en) | 1997-12-17 |
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