JPS6146691A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPS6146691A JPS6146691A JP59168251A JP16825184A JPS6146691A JP S6146691 A JPS6146691 A JP S6146691A JP 59168251 A JP59168251 A JP 59168251A JP 16825184 A JP16825184 A JP 16825184A JP S6146691 A JPS6146691 A JP S6146691A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- color
- vertical correlation
- recording
- comb
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (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、搬送色信号低域変換記録方式を用いたビデオ
テープレコーダなどの磁気記録再生装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording/reproducing apparatus such as a video tape recorder using a carrier color signal low frequency conversion recording method.
従来例の構成とその問題点
近年、ビデオテープレコーダ、（以下ＶＴＲと略称する
）の普及はめざましいが、その大半は搬送色信号低域変
換記録方式により記録再生が行なわれている。従来の記
録再生系のブロック図を第１図、第２図に示す。Conventional Structures and Their Problems In recent years, video tape recorders (hereinafter referred to as VTRs) have become widespread, and most of them perform recording and reproduction using a carrier color signal low frequency conversion recording method. Block diagrams of conventional recording and reproducing systems are shown in FIGS. 1 and 2.
入力端子１よシ入力した映像信号は、１Ｈ遅延線（Ｈは
水平周期）を構成要素とするくし型フィルタ（００ＭＢ
２）により、輝度信号（以下Ｙ信号と略称する）と色信
号（以下Ｃ信号と略称する）に分離される。The video signal input from input terminal 1 is passed through a comb filter (00MB
2), the signal is separated into a luminance signal (hereinafter abbreviated as Y signal) and a color signal (hereinafter abbreviated as C signal).
Ｙ信号はローパスフィルタ（以下ＬＰＦと略称する）３
により帯域を制限された後Ｙ系４でＦＭ変調等の処理を
うけ、バイパスフィルタ（以下Ｈ３ベ−ノ
ＰＦと略称する）５を通った後混合器６によりＣ信号と
混合され、記録アンプ７を通してヘッド１１により記録
される。一方、Ｃ信号はＣ０ＭＢ２で分離された後バン
ドパスフィルタ（以下ＢＰＦと略称する）８により帯域
制限された後Ｃ系９で低域変換等の処理をうけＬＰＦｌ
ｏを通った後混合器６で混合される。The Y signal is a low pass filter (hereinafter abbreviated as LPF) 3
After the band is limited by , it undergoes processing such as FM modulation in the Y system 4, passes through a bypass filter (hereinafter abbreviated as H3 Vano PF) 5, is mixed with the C signal in a mixer 6, and is sent to a recording amplifier 7. The image is recorded by the head 11 through the image. On the other hand, the C signal is separated by C0MB2, band-limited by a band pass filter (hereinafter abbreviated as BPF) 8, and then processed by a C system 9 such as low-pass conversion, and then processed by LPF1.
After passing through o, it is mixed in mixer 6.
ここでＣ信号は、くし型フィルタ２を通す場合と通さ々
い場合がある。Here, the C signal may or may not pass through the comb filter 2.
次に再生時では、ヘッド１２によシ再生された再生信号
は、ヘッドアンプ１３で増幅された後ＨＰＦ１４とＬＰ
Ｆ１９によりＹ信号とＣ信号が分離される。Ｙ信号はＹ
系１５でＦＭ復調等の処理をうけた後、ＬＰＦｌ ６を
通して混合器１７へ送られ、Ｃ信号と混合された後端子
１８に出力される。一方、Ｃ信号はＬＰＦ１９によシ分
離され、Ｃ系２０により高域変換等の処理をうけた後、
ＢＰＦ２１を通って混合器１７へ送られる。ここでＣ系
では、くシ型フィルタＣ０ＭＢ２２を用いて色信号のＳ
／Ｎ改善が行なわれることが多い。Next, during playback, the playback signal played by the head 12 is amplified by the head amplifier 13 and then passed through the HPF 14 and the LP.
F19 separates the Y signal and C signal. Y signal is Y
After being subjected to processing such as FM demodulation in the system 15, it is sent to the mixer 17 through the LPF 16, where it is mixed with the C signal and output to the terminal 18. On the other hand, the C signal is separated by the LPF 19, and after being subjected to processing such as high frequency conversion by the C system 20,
It passes through the BPF 21 and is sent to the mixer 17. Here, in the C system, a comb-shaped filter C0MB22 is used to
/N improvements are often made.
ここでくし型フィルタＣ０ＭＢ２は、１Ｈ以前の信号と
の和、差をとることによりＹ信号とＣ信号を分離するも
のであるが、これはＣ信号の垂直相関が強いために可能
となっている。Here, the comb filter C0MB2 separates the Y signal and the C signal by taking the sum and difference with the signals before 1H, but this is possible because the vertical correlation of the C signal is strong. .
しかし、垂直相関の弱い期間または垂直相関のない期間
ではＹ、Ｃの分離がうまく行なわれず、すなわち、Ｙ信
号にＣ信号の３．５８ ＭＨｚ成分がもれこんだり、ま
たはＣ信号に色むら、色だれを発生させていた。However, in periods where the vertical correlation is weak or there is no vertical correlation, separation of Y and C is not performed well, which means that the 3.58 MHz component of the C signal leaks into the Y signal, or the C signal has color irregularities. It was causing discoloration.
特に、記録、再生系共に色信号系にくし型フィルタを挿
入するシステムでは、色だれか大きく、画質を劣化させ
る原因となっていた。In particular, in a system in which a comb filter is inserted into the color signal system of both the recording and reproducing systems, the color difference is large, causing deterioration of image quality.
発明の目的
本発明の目的は、くし型フィルタによる色だれによって
生じる再生画像の劣化を、改善することを可能にした磁
気記録再生装置を提供することにある。OBJECTS OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing apparatus that makes it possible to improve the deterioration of reproduced images caused by color fading caused by a comb filter.
発明の構成
本発明による磁気記録再生装置は、色信号の垂直相関を
検出し、前記垂直相関が所定量より弱い５ベー、・
時は、色信号を色信号の記録もしくは再生系に含まれて
いるくし型フィルタを通さないように構成したものであ
り、これによりくし型フィルタによる色だれを軽減した
再生画像を提供するものである。Structure of the Invention The magnetic recording and reproducing apparatus according to the present invention detects the vertical correlation of color signals, and when the vertical correlation is weaker than a predetermined amount, the magnetic recording and reproducing device detects the vertical correlation of the color signal. It is configured so that the image does not pass through the comb filter, thereby providing a reproduced image with reduced color blur caused by the comb filter.
実施例の説明
以下、本発明の一実施例について、図面を参照しながら
説明する。本発明の原理をより理解するために第３図に
従来例の波形を示す。第３図ａ。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In order to better understand the principle of the present invention, FIG. 3 shows waveforms of a conventional example. Figure 3a.
ｂ、ｃ、ｄは第１図、第２図の回路ブロックのａ。b, c, and d are a of the circuit blocks in FIGS. 1 and 2.
ｂ、ｃ、ｄの波形を示している。Waveforms b, c, and d are shown.
入力映像信号ａは、Ｙ信号にＣ信号が重畳している波形
を示している。Ｃ０ＭＢ２でＹ、Ｃ分離されるが、色の
Ｈ相関のないＨ区間は正確に分離され々い。このため、
ｂのＹ信号中に信号Ｓ１としてＣ信号がもれることにな
る。Input video signal a has a waveform in which a C signal is superimposed on a Y signal. Although Y and C are separated in C0MB2, the H section, which has no H color correlation, cannot be accurately separated. For this reason,
The C signal is leaked as the signal S1 into the Y signal of b.
まだＣ信号は、Ｃ０ＭＢ２の影響で垂直相関のない区間
では振幅が減り色だれを生じる（Ｓ２）。The amplitude of the C signal is still reduced in the section where there is no vertical correlation due to the influence of C0MB2, causing color blurring (S2).
これら信号を記録、再生した場合、記録再生帯域２〜３
ＭＨ２の家庭用ＶＴＲでは、３．５８ ＭＨｚ成 。When recording and reproducing these signals, recording and reproducing bands 2 to 3
The MH2 home VTR has a frequency of 3.58 MHz.
６Ａ−ノ
分であるノイズＳ１は記録再生されず問題とはならナイ
カ、色信号Ｃは、Ｃ０ＭＢ２とＣ０ＭＢ２２ （７）影
響をうけて、再生時には大きく色だれを起こしてしまう
。これをｄの８３に示す。The noise S1 corresponding to 6A- is not recorded or reproduced and is not a problem, but the color signal C is affected by C0MB2 and C0MB22 (7) and causes a large color blur during reproduction. This is shown in 83 of d.
次に第４図に本発明による回路ブロック図を示す。また
第６図に第４図に対応する各部波形図を示す。第４図と
従来例第１図と比較すると、スイッチ回路（Ｓ Ｗ ）
２７と比較回路２６ Ｂ Ｐ Ｆ ２４゜２６が追加
されていることがわかる。くし型フィルタＣ０ＭＢ２は
、少し詳しく示しただけであり従来例との差はない。こ
こでＤＬ２３は１Ｈ遅延素子である。Next, FIG. 4 shows a circuit block diagram according to the present invention. Further, FIG. 6 shows waveform diagrams of various parts corresponding to FIG. 4. Comparing Fig. 4 with the conventional example Fig. 1, the switch circuit (S W )
27 and a comparison circuit 26 B P F 24° 26 are added. The comb filter C0MB2 is only shown in some detail, and there is no difference from the conventional example. Here, DL23 is a 1H delay element.
この各部の動作と第５図を用いて説明する。The operation of each part will be explained using FIG. 5.
ここで第５図ａ＋ ｂ＋ Ｃ＊ ｄ＋ ｅ＋ ｆ＋ ｑ
は、それぞれ第４図と対応している。Here, Fig. 5 a+ b+ C* d+ e+ f+ q
correspond to FIG. 4, respectively.
入力信号ａはＣ０ＭＢ２によりＹ信号すとＣ信号ｆに分
離される。一方、入力信号ａと１Ｈ遅延された信号の３
．５８ ＭＨｚ成分はＢＰＦ２５．ＢＰＦ２４を通シ、
信号ｃ、ｄとなって比較回路２６へ送られる。比較回路
２６では信号Ｃと信号ｄの振幅も７ベ啼
しくけ位相を比較し、差に応じてｅの如き信号を発生す
る。ここで、振幅もしくは位相を比較する回路は従来技
術で種々考えられるため、本実施例ではブロック図を示
すにとどめる。さて、スイッチ回路５Ｗ２７は、制御信
号ｅを入力し、信号ｅがローレベルの時Ｃ０ＭＢ２の出
力信号ｆを選択し、信号ｅがハイレベルの時入力信号ａ
を選択する。The input signal a is separated into a Y signal and a C signal f by C0MB2. On the other hand, 3 of the input signal a and the signal delayed by 1H
．． 58 MHz component has BPF25. Through BPF24,
The signals become signals c and d and are sent to the comparison circuit 26. The comparison circuit 26 also compares the amplitudes and phases of the signals C and d, and generates a signal such as e according to the difference. Here, since various circuits for comparing amplitude or phase can be considered in the prior art, only a block diagram is shown in this embodiment. Now, the switch circuit 5W27 inputs the control signal e, selects the output signal f of C0MB2 when the signal e is at a low level, and selects the input signal a when the signal e is at a high level.
Select.
ここで、信号ｆと信号ａのレベルは同レベルになるよう
にＣ０ＭＢ２で調整されているのが望ましい。Here, it is desirable that the levels of the signal f and the signal a be adjusted by C0MB2 so that they are at the same level.
この結果色信号はｑに示す如き波形となシ色だれか改善
されているのがわかる。As a result, the color signal has a waveform as shown in q, and it can be seen that the color has been improved.
さて、本発明は、ＶＴＲの再生系においても同様に言え
る。再生系のブロック図を第６図に示す。Now, the present invention can be similarly applied to a reproduction system of a VTR. A block diagram of the reproduction system is shown in FIG.
従来例での第２図に比べて、比較回路３０とスイッチ回
路２８が追加されているのは、記録系での追加と同様で
ある。Ｃ０ＭＢ２２の内容を詳しく示しているが、従来
と変化するものではない。ここでＤＬ２９は１Ｈ遅延素
子である。Compared to the conventional example shown in FIG. 2, a comparator circuit 30 and a switch circuit 28 are added in the same manner as in the recording system. Although the content of C0MB22 is shown in detail, it is not different from the conventional one. Here, DL29 is a 1H delay element.
今、従来回路で、記録したテープを再生するとする。そ
の時の波形を第７図ａ、ｂ、Ｃ，ｄ、ｅ。Suppose now that a recorded tape is to be played back using a conventional circuit. The waveforms at that time are shown in Figure 7 a, b, c, d, and e.
ｆに示す。ここで記録時Ｃ信号はＣ０ＭＢ２と通してい
ないものとする。Shown in f. Here, it is assumed that the C signal is not passed through C0MB2 during recording.
本発明により、再生色信号すと１Ｈ遅延した色信号Ｃを
比較回路に入力し、振幅もしくは位相を比較する。その
結果、信号ｄを出力するのは、記録系で述べたのと同様
である。According to the present invention, the reproduced color signal and the color signal C delayed by 1H are input to a comparison circuit, and the amplitudes or phases are compared. As a result, the signal d is output in the same way as described for the recording system.
信号ｄ カローレベルの時、５Ｗ２８にて、Ｃ信号はＣ
０ＭＢ２２の出力信号ｅを選択し、Ｓ／Ｎの改善が行な
われ、丑だ信号ｄがハイレベルの時、５Ｗ２Ｂにてくし
型フィルタをパスする。これにより再生色信号はｆに示
す如く色だれを起さず、かつほとんどの区間でＳハ改善
効果を維持している。When the signal d is color level, the C signal is C at 5W28.
The output signal e of 0MB22 is selected, the S/N is improved, and when the waste signal d is at a high level, it passes the comb filter at 5W2B. As a result, the reproduced color signal does not suffer from color fading as shown in f, and the improvement effect of S is maintained in most sections.
次に第７図ｑは、第５図入力信号ａを記録再生系共くし
型フィルタを挿入した時の再生波形を示しており、２Ｈ
にわたり色だれＳ４が発生しているのを示している。Next, FIG. 7q shows the reproduced waveform when a comb filter is inserted in the recording and reproducing system for the input signal a in FIG.
It is shown that color smudge S4 occurs over the entire area.
ｈは記録、再生系井水発明を用いた時の再生波形を示し
ている。ｑとｈを比較すれば、色だれの改善効果は明ら
かである。h shows a reproduced waveform when using the recording and reproducing system Isui Invention. Comparing q and h, the effect of improving color bleeding is clear.
９ページ
このように本発明は、記録、もしくは再生系のいずれか
で行なっても、また両方の系で行なってもよい。Page 9 As described above, the present invention may be implemented in either the recording or reproducing system, or in both systems.
また、実施例において比較回路２６．３０の出力は、入
力される色信号の振幅もしくは位相の差に応じてレベル
が変化するアナログ信号でもよく、また２人力が所定の
差以上になった時にハイレベルを出力するディジタル信
号でもよい。Further, in the embodiment, the output of the comparator circuits 26 and 30 may be an analog signal whose level changes depending on the amplitude or phase difference of the input color signals, and the output becomes high when the two human powers exceed a predetermined difference. It may also be a digital signal that outputs a level.
同様に、スイッチ回路２７．２８は、比較回路２６．３
０からの信号レベルに応じて２つの入力信号の混合比を
アナログ的に変化させる構成でもよく、またディジタル
的に処理する回路でもよい。Similarly, switch circuits 27.28 and comparator circuits 26.3
The configuration may be such that the mixing ratio of the two input signals is changed in an analog manner depending on the signal level from 0, or the circuit may be configured to perform digital processing.
また色の記録再生系に挿入されているくし型フィルタは
両方の系に挿入してもよく、又いずれか一方挿入するだ
けでもよい。Further, the comb filter inserted in the color recording/reproducing system may be inserted in both systems, or only in one of them.
発明の効果
以上の説明から明らかなように、本発明による磁気記録
再生装置は、色信号の垂直相関を検出し、垂直相関が弱
い時には色信号を、色信号の記録も゛シフは再生系に含
まれているくし型フィルタを通１０ベーッ
さすにパスすることにより、色だれを大幅に軽減した再
生画像を提供するものであり、特にくし型フィルタを複
数個使用するＶＴＲにとって、その効果は大なるものが
ある。Effects of the Invention As is clear from the above explanation, the magnetic recording and reproducing apparatus according to the present invention detects the vertical correlation of color signals, and when the vertical correlation is weak, the color signal is recorded, and the recording of the color signal is also shifted to the reproduction system. By passing the included comb filter every 10 times, it provides a reproduced image with significantly reduced color blur, and this is especially effective for VTRs that use multiple comb filters. There is something.
第１図、第２図はそれぞれ従来の磁気記録再生装置にお
ける記録再生系回路のブロック図、第３図はその信号波
形図、第４図は本発明の一実施例による磁気記録再生装
置の記録系のブロック図、第６図はその信号波形図、第
６図は上記実施例の再生系のブロック図、第７図はその
信号波形図である。
２．２２・・・・・・くシ形フィルタ、２３．２９・・
・・・・遅延素子、２４．２５・・・・・ＢＰＦ、２６
．３０・・・・・・比較回路、２７．２８・・・・・・
スイッチ回路。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名Ｃ−
始 ４ （）
（５−ゞ1 and 2 are block diagrams of recording and reproducing circuits in a conventional magnetic recording and reproducing device, FIG. 3 is a signal waveform diagram thereof, and FIG. 4 is a recording and reproducing circuit of a magnetic recording and reproducing device according to an embodiment of the present invention. FIG. 6 is a block diagram of the reproduction system of the above embodiment, and FIG. 7 is a signal waveform diagram thereof. 2.22...Comb filter, 23.29...
...Delay element, 24.25...BPF, 26
．． 30... Comparison circuit, 27.28...
switch circuit. Name of agent: Patent attorney Toshio Nakao and one other person C-
Beginning 4 () (5-ゞ
Claims (4)
直相関が所定量より弱い時に、前記色信号が色信号の記
録もしくは再生系に含まれているくし型フィルタを通過
することを阻止する手段とを設けたことを特徴とする磁
気記録再生装置。(1) Detection means for detecting vertical correlation of color signals, and when the vertical correlation is weaker than a predetermined amount, preventing the color signals from passing through a comb filter included in the color signal recording or reproduction system. 1. A magnetic recording and reproducing device, characterized in that it is provided with means for.
前の色信号との振幅もしくは位相の相関を検出すること
を特徴とする特許請求の範囲第（１）項記載の磁気記録
再生装置。(2) The vertical correlation of color signals is determined by detecting the amplitude or phase correlation between the color signal and a color signal before one horizontal period. Device.
像信号を輝度信号と色信号に分離するためのくし型フィ
ルタであることを特徴とする特許請求の範囲第（１）項
記載の磁気記録再生装置。(3) The comb filter included in the recording system is a comb filter for separating an input video signal into a luminance signal and a color signal. Magnetic recording and reproducing device.
信号のノイズ低減に使用されていることを特徴とする特
許請求の範囲第（１）項記載の磁気記録再生装置。(4) The magnetic recording and reproducing apparatus according to claim (1), wherein the comb-shaped filter included in the reproduction system is used to reduce noise in the reproduced color signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59168251A JPS6146691A (en) | 1984-08-11 | 1984-08-11 | Magnetic recording and reproducing device |
| KR1019850005779A KR900005604B1 (en) | 1984-08-11 | 1985-08-10 | Magnetic recording and playback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59168251A JPS6146691A (en) | 1984-08-11 | 1984-08-11 | Magnetic recording and reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6146691A true JPS6146691A (en) | 1986-03-06 |
| JPH0222598B2 JPH0222598B2 (en) | 1990-05-21 |
Family
ID=15864545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59168251A Granted JPS6146691A (en) | 1984-08-11 | 1984-08-11 | Magnetic recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6146691A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5048199A (en) * | 1989-01-06 | 1991-09-17 | Wen-Don Corporation | Dewatering composition |
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| JPS538836U (en) * | 1976-07-08 | 1978-01-25 | ||
| JPS55150688A (en) * | 1979-05-15 | 1980-11-22 | Sony Corp | Separating circuit of color video signal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51109393A (en) * | 1975-03-20 | 1976-09-28 | Santo Tekkosho Kk | SENJOSOCHI |
-
1984
- 1984-08-11 JP JP59168251A patent/JPS6146691A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5193121A (en) * | 1975-02-13 | 1976-08-16 | ||
| JPS538836U (en) * | 1976-07-08 | 1978-01-25 | ||
| JPS55150688A (en) * | 1979-05-15 | 1980-11-22 | Sony Corp | Separating circuit of color video signal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5048199A (en) * | 1989-01-06 | 1991-09-17 | Wen-Don Corporation | Dewatering composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0222598B2 (en) | 1990-05-21 |
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