JPH03125594A - Video signal recorder - Google Patents
Video signal recorderInfo
- Publication number
- JPH03125594A JPH03125594A JP1264412A JP26441289A JPH03125594A JP H03125594 A JPH03125594 A JP H03125594A JP 1264412 A JP1264412 A JP 1264412A JP 26441289 A JP26441289 A JP 26441289A JP H03125594 A JPH03125594 A JP H03125594A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- band
- recording
- color signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005236 sound signal Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 101000860173 Myxococcus xanthus C-factor Proteins 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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などの映像信号記録装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a video signal recording device such as a video tape recorder.
従来の技術
家庭用ビデオテープレコーダ（ＶＨ３方式）における映
像信号処理は、輝度信号（Ｙ信号）を３．４〜４．４Ｍ
Ｈｚ帯域にＦＭ変調し、色信号（Ｃ信号）は６２９ｋｚ
に周波数変換し輝度信号のＦＭ波に重畳する方式を採用
している。この低域変換色信号記録方式では、色信号の
帯域が４００ｋＨｚに制限されている。また輝度信号の
帯域も高画質化のためには十分とはいえず、画質向上の
ためには基本的にこれらの帯域をさらに広げることが重
要である。Conventional technology Video signal processing in a home video tape recorder (VH3 system) converts a luminance signal (Y signal) to 3.4 to 4.4M.
FM modulated in Hz band, color signal (C signal) is 629kHz
A method is adopted in which the frequency is converted and superimposed on the FM wave of the luminance signal. In this low frequency conversion color signal recording method, the color signal band is limited to 400 kHz. Furthermore, the band of the luminance signal is not sufficient for improving image quality, and it is basically important to further widen these bands in order to improve image quality.
近年、ビデオテープレコーダの高画質化の要望が高まり
、従来方式との上位互換性を持つ５−ＶＨ３方式が開発
され実用化されている。Ｓ−ＶＨＳ方式における映像信
号処理では、輝度信号をＦＭ変調する際に、キャリア周
波数を高く設定し、５．４〜７ 、０ Ｍ Ｈｚに周波
数帯域を広げることにより高画質化（高精細化）を図っ
ている。また色信号については、ＶＨ３方式の帯域とほ
とんど変わらず、画質向上の点からはこの帯域はさらに
拡大することが必要である。In recent years, there has been an increasing demand for higher image quality in video tape recorders, and the 5-VH3 system, which is upwardly compatible with conventional systems, has been developed and put into practical use. In video signal processing in the S-VHS system, when performing FM modulation on a luminance signal, the carrier frequency is set high and the frequency band is widened from 5.4 to 7.0 MHz to achieve high image quality (high definition). We are trying to Furthermore, the color signal band is almost the same as the band of the VH3 system, and from the viewpoint of improving image quality, it is necessary to further expand this band.
そこで、この色信号の帯域を拡大するだめの手法として
ラインサブナイキスト法による色信号帯Ｎｏ、 ４．
ｐｐ、 ３２４−３２５． １９８９）発明が解決し
ようとする課題
上記の手法によれば、色信号帯域が４００ ｋ ＆から
７００ｋＨｚに拡大され、画質は向上することが確認さ
れている。しかしながら従来方式との互換性については
標準モード（ＳＰモード）では互換性が確保されてはい
るものの、３倍モード（ＬＰモード）では現存機種との
互換において、隣接トラックの折り返し成分が妨害とな
って従来方式との互換性は成立しないといった問題点が
あった。Therefore, as a method to expand the color signal band, the color signal band No. 4 is determined by the line sub-Nyquist method.
pp, 324-325. 1989) Problems to be Solved by the Invention It has been confirmed that according to the above method, the color signal band is expanded from 400 kHz to 700 kHz, and the image quality is improved. However, although compatibility with conventional methods is ensured in standard mode (SP mode), aliasing components of adjacent tracks interfere with compatibility with existing models in triple mode (LP mode). However, there was a problem that compatibility with conventional methods was not established.
課題を解決するための手段
本発明は、上述の課題を解決するため、映像信号をＦＭ
変調して記録する記録装置であって、前記ＦＭ変調信号
のホワイトクリップ周波数より高い周波数帯域に情報信
号を多重して記録する記録装置から構成されたものであ
る。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention converts video signals into FM
This is a recording apparatus that performs modulation and recording, and is comprised of a recording apparatus that multiplexes and records information signals in a frequency band higher than the white clip frequency of the FM modulation signal.
作用
本発明は、上述した構成により、従来方式との互換性を
保ったまま、大幅に画質あるいは音質を改善できる機器
を提供できるという効果がある。Effects The present invention has the effect of providing a device that can significantly improve image quality or sound quality while maintaining compatibility with conventional systems due to the above-described configuration.
実施例
以下、本発明の一実施例について図面を参照にして説明
する。第１図は多重化する情報信号として色信号を選ん
だ場合の本発明の要部構成を示すブロック図であり、（
ａ）は記録系、（ｂ）は再生系を示す。入力端子１には
ビデオカメラあるいは映像信号源からの輝度信号、入力
端子２には色信号が入力される。輝度信号は、従来方式
と同様に、ＬＰＦ３、エンファシス回路４を経てＦＭ変
調器５に入力され、ＨＰＦ６を通って周波数多重位置１
１へ出力される。また色信号は周波数変換回路７、ＬＰ
Ｆ８によって輝度信号帯域よりも低域に周波数変換され
、４００ｋＨｚに帯域制限される。またＨＰＦ９で取り
出された色信号の高周波成分をホワイトクリップ周波数
よりも高い周波数帯域に、ＦＭ変調器１０で変調する。EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the main configuration of the present invention when a color signal is selected as the information signal to be multiplexed.
(a) shows a recording system, and (b) shows a reproduction system. A luminance signal from a video camera or a video signal source is input to an input terminal 1, and a color signal is input to an input terminal 2. As in the conventional system, the luminance signal is input to the FM modulator 5 via the LPF 3 and the emphasis circuit 4, and then passes through the HPF 6 to the frequency multiplexing position 1.
Output to 1. In addition, the color signal is transmitted to the frequency conversion circuit 7, LP.
The frequency is converted to a frequency lower than the luminance signal band by F8, and the band is limited to 400 kHz. Further, the high frequency component of the color signal extracted by the HPF 9 is modulated into a frequency band higher than the white clip frequency by the FM modulator 10.
このようにして得られた３種類の信号を周波数多重器１
１で重畳し、記録アンプ１２で増幅した後、ヘッド１３
を通してテープ１４に記録する。このときの周波数アロ
ケーションを第２図に示す。ただし、従来方式としては
５−ＶＨ８方式を想定している。The three types of signals obtained in this way are transferred to the frequency multiplexer 1.
1 and amplified by the recording amplifier 12, the head 13
The information is recorded on the tape 14 through the recording medium. The frequency allocation at this time is shown in FIG. However, the 5-VH8 system is assumed as the conventional system.
このようにして記録された信号は、再生時に、ヘッド１
６によって再生される。再生時のテープ／ヘッド系は記
録時のテープ／ヘッド系と同一であっても、またヘッド
が異なっていても差し支えない。再生アンプ１７によっ
て増幅された出力信号は、各帯域ごとにフィルタによっ
て取り出される。輝度信号はＢＰＦ１８、リミッタ−回
路１９、ＦＭ復調器２０、デイエンファシス回路２１を
経て出力端子２２に取り出される。また従来方式の色信
号はＬ ＰＦ２３、周波数変換器２４を経て出力される
。当然この色信号は、４００ ｋ Ｈｚに帯域制限され
る色信号である。そしてさらにＨＰＦ２５、リミッタ−
回路２６、ＦＭ復調回路２７によって高域の周波数領域
に多重した情報信号、この場合は色信号の高周波成分を
取り出し、前述の帯域制限された色信号に周波数多重器
２８で重畳することで、出力端子２９に広帯域の色信号
を再生することができる。When the signal recorded in this way is played back, the head 1
Reproduced by 6. The tape/head system during playback may be the same as the tape/head system during recording, or the heads may be different. The output signal amplified by the reproduction amplifier 17 is extracted by a filter for each band. The luminance signal is taken out to an output terminal 22 via a BPF 18, a limiter circuit 19, an FM demodulator 20, and a de-emphasis circuit 21. Further, the conventional color signal is outputted through the LPF 23 and the frequency converter 24. Naturally, this color signal is band-limited to 400 kHz. And further HPF25, limiter
The information signal multiplexed in the high frequency range by the circuit 26 and the FM demodulation circuit 27, in this case the high frequency component of the color signal, is taken out and superimposed on the band-limited color signal mentioned above by the frequency multiplexer 28, and output. A wideband color signal can be reproduced at the terminal 29.
本発明で用いるヘッド／テープ系は、従来方式で用いら
れていたものと比較して、より単波長領域で使用するこ
とになるために、ヘッド側では透磁率が高く、しかもギ
ャップ長が短いヘッドを、テープ側では磁気特性のより
優れたテープを用いることが望ましい。ただし互換性を
考えて、テープの保磁力は従来のビデオテープと同程度
にする必要がある。The head/tape system used in the present invention is used in a more single wavelength region than that used in conventional systems, so the head side has a high magnetic permeability and a short gap length. However, it is desirable to use a tape with better magnetic properties on the tape side. However, for compatibility, the tape's coercive force must be at the same level as conventional video tape.
また本発明による記録方式を機器側で自動的に判断でき
るように、ビデオテープのカセットハーフ裏面に第３図
に示すような検出孔３２を設けておくと、テープ使用時
の操作ミスを防ぐことができる。なお、第３図において
、３０はテープ裏面、３１は５−ＶＨ３検出孔、３３は
背面である。Furthermore, if a detection hole 32 as shown in FIG. 3 is provided on the back of the videotape cassette half so that the recording method according to the present invention can be automatically determined on the equipment side, operational errors when using the tape can be prevented. I can do it. In FIG. 3, 30 is the back surface of the tape, 31 is the 5-VH3 detection hole, and 33 is the back surface.
以上、情報信号として色信号を選択した場合について述
べたが、輝度信号や音声信号の変調信号を高域に多重し
た場合においても、従来の記録方式を妨害することなく
、画質あるいは音質の改善が可能であることは言うまで
もない。The above has described the case where a color signal is selected as an information signal, but even when a modulation signal of a luminance signal or an audio signal is multiplexed in a high frequency range, it is possible to improve image or sound quality without interfering with conventional recording methods. It goes without saying that it is possible.
また、色信号の変調、復調方式をＦＭとして説明したが
、ＡＭ、ＰＭなどの変調方式であってもかまわない。Moreover, although the modulation and demodulation method of the color signal is described as FM, it may be a modulation method such as AM or PM.
発明の効果
以上のように本発明によれば、家庭用ビデオテープレコ
ーダの従来の記録方式との互換性を保ちながら、新たに
情報信号を付加することで画質あるいは音質を容易に改
善できるという効果がある。Effects of the Invention As described above, according to the present invention, the image quality or sound quality can be easily improved by adding new information signals while maintaining compatibility with the conventional recording method of home video tape recorders. There is.
第１図は本発明の一実施例における要部構成を示すブロ
ック図、第２図は本発明の一実施例における各信号の周
波数アロケーション図、第３図は本発明による記録方式
用のビデオカセットハーフの外観図である。
１・・・・・・輝度信号入力端子、２・・・・・・色信
号入力端子、３，８．２３・・・・・・ＬＰＦ （ロー
パスフィルタ）、４・・・・・・エンファシス回路、５
，１０・・・・・・Ｆ Ｍ 変調Ｒｘ、６．９．２５・
・・・・・ＨＰＦ （バイパスフィルタ）、７２４・・
・・・・周波数変換器、１１．２８・・・・・・周波数
多重器、１２・・・・・・記録アンプ、１３．１６・・
・・・・ヘッド、１４．１５・・・・・・テープ、１７
・・・・・・再生アンプ、１８・・・・・・ＢＰＦ （
バンドパスフィルタ） 、１９．２６・・・・・・リミ
ッタ−回路、２０、２７・・・・・・Ｆ Ｍ復調器、２
１・・・・・・デイエンファシス回路、２２・・・・・
・輝度信号出力端子、２９・・・・・・色信号出力端子
。FIG. 1 is a block diagram showing the configuration of main parts in an embodiment of the present invention, FIG. 2 is a frequency allocation diagram of each signal in an embodiment of the present invention, and FIG. 3 is a video cassette for the recording method according to the present invention. It is an external view of the half. 1... Luminance signal input terminal, 2... Color signal input terminal, 3, 8.23... LPF (low pass filter), 4... Emphasis circuit ,5
,10...F M modulation Rx, 6.9.25.
...HPF (bypass filter), 724...
...Frequency converter, 11.28...Frequency multiplexer, 12...Recording amplifier, 13.16...
...Head, 14.15...Tape, 17
......Reproduction amplifier, 18...BPF (
Bandpass filter), 19.26...Limiter circuit, 20, 27...FM demodulator, 2
1... De-emphasis circuit, 22...
- Luminance signal output terminal, 29... Color signal output terminal.
Claims (5)
て、前記ＦＭ変調信号のホワイトクリップ周波数より高
い周波数帯域に情報信号を多重して記録することを特徴
とする映像信号記録装置。(1) A video signal recording device that performs FM modulation on a video signal and records the video signal, the video signal recording device being characterized in that information signals are multiplexed and recorded in a frequency band higher than the white clip frequency of the FM modulation signal.
ことを特徴とする請求項（１）記載の映像信号記録装置
。(2) The video signal recording device according to claim (1), wherein a signal obtained by modulating an audio signal is used as the information signal.
とを特徴とする請求項（１）記載の映像信号記録装置。(3) The video signal recording apparatus according to claim (1), wherein a signal obtained by modulating a color signal is used as the information signal.
ことを特徴とする請求項（１）記載の映像信号記録装置
。(4) The video signal recording device according to claim (1), wherein a signal obtained by modulating a luminance signal is used as the information signal.
調して記録する記録装置であって、前記ＦＭ変調信号の
ホワイトクリップ周波数より高い周波数帯域に前記色信
号の高周波成分を変調した信号を多重して記録すること
を特徴とする映像信号記録装置。(5) A recording device that frequency-converts a color signal to a low frequency band and performs FM modulation on a luminance signal and records the same, the high-frequency component of the color signal being modulated to a frequency band higher than the white clip frequency of the FM modulation signal. A video signal recording device characterized by multiplexing and recording signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1264412A JPH03125594A (en) | 1989-10-11 | 1989-10-11 | Video signal recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1264412A JPH03125594A (en) | 1989-10-11 | 1989-10-11 | Video signal recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03125594A true JPH03125594A (en) | 1991-05-28 |
Family
ID=17402808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1264412A Pending JPH03125594A (en) | 1989-10-11 | 1989-10-11 | Video signal recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03125594A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51135519A (en) * | 1975-05-19 | 1976-11-24 | Sony Corp | Recording method of video signal and aural signal |
| JPS5287933A (en) * | 1976-01-19 | 1977-07-22 | Sony Corp | Recording method of video signal |
-
1989
- 1989-10-11 JP JP1264412A patent/JPH03125594A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51135519A (en) * | 1975-05-19 | 1976-11-24 | Sony Corp | Recording method of video signal and aural signal |
| JPS5287933A (en) * | 1976-01-19 | 1977-07-22 | Sony Corp | Recording method of video signal |
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