JPS6139784A - Magnetic recording and reproducing method - Google Patents
Magnetic recording and reproducing methodInfo
- Publication number
- JPS6139784A JPS6139784A JP16171384A JP16171384A JPS6139784A JP S6139784 A JPS6139784 A JP S6139784A JP 16171384 A JP16171384 A JP 16171384A JP 16171384 A JP16171384 A JP 16171384A JP S6139784 A JPS6139784 A JP S6139784A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- recording
- video signal
- recorded
- digital 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/78213—Television signal recording using magnetic recording on tape involving recording in different depths of the magnetic tape
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires
- G11B5/00813—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes
- G11B5/00847—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes on transverse tracks
- G11B5/0086—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes on transverse tracks using cyclically driven heads providing segmented tracks
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
-
- 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
- H04N9/802—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving processing of the sound signal
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Digital Magnetic Recording (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は映像信号を記録したトラック上に符号変調した
音声信号など他のデジタル信号を記録し、分離再生する
ことを可能とする高密度の磁気記録再生方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to high-density magnetic recording that allows other digital signals such as code-modulated audio signals to be recorded on tracks on which video signals have been recorded and to be separately reproduced. This relates to a reproduction method.
３へ−７
従来例の構成とその問題点
従来の磁気記録再生装置、例えば回転ヘッド式ビデオテ
ープレコーダ（′以下、ＶＴＲと略称する）においては
映像信号を形成する輝度信号と色信号をビデオトラック
に記録し、音声信号は別のオーディオトラックに記録す
るように構成し、映像信号記録のだめの２個の回転ヘッ
ドのアジマス角を異ならせた、いわめるアジマス記録に
よシ使用する磁気テープのほぼ全面を利用している。To 3-7 Conventional configuration and its problems In a conventional magnetic recording/reproducing device, for example, a rotating head video tape recorder (hereinafter abbreviated as VTR), the luminance signal and color signal forming the video signal are transferred to the video track. The magnetic tape used for so-called azimuth recording is structured so that the audio signal is recorded on a separate audio track, and the azimuth angles of the two rotating heads for recording the video signal are different. Almost the entire area is used.
最近、音声信号記録の性能向上を目的としてＶＴＲのビ
デオトラックに周波数変調した音声信号を映像信号とと
もに記録する方法が実用化されている。その記録方式に
おける周波数アロケーションを第１図に、そして磁気テ
ープの深さ、方向への記録状態図を第２図に示す。Recently, a method of recording a frequency-modulated audio signal together with a video signal on a video track of a VTR has been put into practical use for the purpose of improving the performance of audio signal recording. FIG. 1 shows the frequency allocation in this recording method, and FIG. 2 shows a diagram of the recording state in the depth and direction of the magnetic tape.
第１図において、１は周波数変調された同期信号を含む
輝度信号、２は低域変換された搬送色信号である。３は
音声信号を周波数変調（ＦＭ）した信号であり、低域変
換搬送色信号２とＦＭ輝度信号１との間の帯域に音声専
用ヘッドによって映像信号用ヘッドとは異なるアジマス
角で記録される。In FIG. 1, 1 is a luminance signal containing a frequency-modulated synchronization signal, and 2 is a carrier color signal that has been low-pass converted. 3 is a frequency modulated (FM) signal of an audio signal, which is recorded in the band between the low frequency conversion carrier color signal 2 and the FM luminance signal 1 by the audio dedicated head at an azimuth angle different from that of the video signal head. .
第２図から明らかなように、周波数変調された音声信号
は映像信号よりも先に大きな記録電流でもって磁性層４
の深層４ａに配録され、映像信号はそのあとから磁性層
４の表層４に記録されることになる。なお、５はベース
フィルムラ示ス。As is clear from FIG. 2, the frequency-modulated audio signal is transferred to the magnetic layer 4 with a large recording current before the video signal.
The video signal is then recorded on the surface layer 4 of the magnetic layer 4. Note that 5 indicates the base film layer.
このような従来例の場合、音声信号／ｄＦＭ記録される
だめＳ／Ｎが大きくとれ、品質がより上に、手−プ走行
速度を遅くしても音質が劣化しない特長があるため、長
時間ＶＴＲの記録方式として一つの有力な手段であると
言える。しかも従来使用していなかった磁気テープ磁性
層の深層を利用している点も注目に値する。In the case of such a conventional example, the S/N ratio of the audio signal/dFM recording is large, the quality is higher, and the sound quality does not deteriorate even if the hand speed is slowed down, so it can be used for a long time. It can be said that this is one of the most effective recording methods for VTRs. Moreover, it is noteworthy that it utilizes the deep layer of the magnetic tape magnetic layer, which was not previously used.
しかしながら、上述した従来例にはいくつかの問題点が
ある。その第１にはＦＭ音声信号を深層に記録するだめ
、記録ヘッドには大電流を供給する必要があり、そのた
め記録できる周波数帯域は比較的低い方に制限される点
である。その結果、音声信号のＦＭ記録よりさらに高品
質な符号変調 。However, the conventional example described above has several problems. Firstly, in order to record FM audio signals deeply, it is necessary to supply a large current to the recording head, which limits the frequency band that can be recorded to a relatively low range. The result is code modulation of higher quality than FM recording of audio signals.
５ヘーノ
（ＰＧＭ）記録への展開が不可能であったり（ＦＭより
広帯域を必要とするため）、音声信号を大電流で低域側
に記録しであるため映像信号を再生する際に深層に記録
されている音声信号の妨害が無視できなかったり、音声
信号記録のだめの大電流供給回路が大規模になる点、大
電流が他のビデオ回路へ及ぼす悪影響などを招く。第２
には、アフターレコーディングが不可能な点である。従
来、ＶＴＲでは、映像と音声が別々のトラックに記録さ
れているので、映像を再生しながら音声を後から記録す
る、いわゆるアフターレコーディングができる。しかし
第２図から明らかなように音声信号が深層に記録されて
いるため、それを消去したり再記録したりするには映像
信号も消えてしまうことになり、アフターレコーディン
グは不可能である。5 Henno (PGM) recording is not possible (because it requires a wider band than FM), and because the audio signal is recorded in the low frequency side with a large current, it is difficult to record the audio signal in the deep layer when playing back the video signal. This may result in non-negligible interference with the recorded audio signal, the large scale of the large current supply circuit for recording the audio signal, and the adverse effects of the large current on other video circuits. Second
However, after-recording is not possible. Conventionally, in a VTR, video and audio are recorded on separate tracks, so it is possible to record the audio later while playing the video, so-called after-recording. However, as is clear from Figure 2, the audio signal is recorded deep down, so if it were to be erased or re-recorded, the video signal would also disappear, making after-recording impossible.
発明の目的
本発明の目的は、上述した従来のＶＴＲがもつ問題点を
解決しようとするものであって、映像信号が記録されて
いる映像トラック上の浅層部に音６・、−７
声信号を符号化しだＰＧＭ信号など広帯域のデジタル信
号を記録してＶＴＲの高記録密度化を可能にするととも
に、浅層部に記録したデジタル信号の消去、再記録をも
可能とする磁気記録再生方法を提供せんとするものであ
る。OBJECT OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the conventional VTR. A magnetic recording and reproducing method that enables higher recording density in VTRs by recording wideband digital signals such as encoded PGM signals, and also enables erasing and re-recording of digital signals recorded in shallow layers. We aim to provide the following.
発明の構成
本発明の磁気記録再生方法は、映像信号を記録したトラ
ック上に、映像信号の記録ヘッドとアジマス角が異なる
ヘッドによりデジタル信号を変調して重ね記録し、互い
にアジマス角の異々るヘッドにより映像信号およびデジ
タル信号を再生するようにしたものであって、これによ
りＰＧＭ音声信号など高品質の信号再生を可能とし、ま
たデジタル信号の消去・再記録も可能であるため高密度
記録の一方法として多くの応用が可能である。Structure of the Invention The magnetic recording and reproducing method of the present invention modulates and overwrites a digital signal on a track on which a video signal is recorded by a head having a different azimuth angle from the recording head of the video signal, The head reproduces video signals and digital signals, which enables high-quality signal reproduction such as PGM audio signals, and also enables erasing and re-recording of digital signals, making it suitable for high-density recording. As a one-sided method, many applications are possible.
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図は本発明の詳細な説明するための磁性層
深さ方向の記録状態図である。DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a recording state diagram in the depth direction of the magnetic layer for explaining the present invention in detail.
映像信号の記録を従来通り回転ヘッドにより磁気テープ
に記録すると、その記録層の深さは記録波長の０・２５
〜０．３倍であり、現在の民生用ＶＴＲでば０・３〜０
．８μｍの深さにまで記録されていることになり、一般
の磁気テープの磁性層６の厚さが２〜４μｍであること
からすると、第３図に示すように無記録層６Ｃが存在す
る。第１図および第２図で説明した従来例は、この無記
録層を利用するものであるが、本質的に長波長（低周波
帯域）の信号しか記録できなかった。広帯域の信号を記
録するにはテープ磁性層の浅層部が適しており、事実、
映像信号の記録はごく表面部にのみ行々われでいる。When video signals are conventionally recorded on magnetic tape using a rotating head, the depth of the recording layer is 0.25 of the recording wavelength.
~0.3 times, which is 0.3 to 0 for current consumer VTRs.
．． Since the recording is made to a depth of 8 μm, and since the thickness of the magnetic layer 6 of a general magnetic tape is 2 to 4 μm, there is a non-recording layer 6C as shown in FIG. The conventional example explained in FIGS. 1 and 2 utilizes this non-recording layer, but essentially only signals with long wavelengths (low frequency band) can be recorded. In fact, the shallow part of the tape magnetic layer is suitable for recording broadband signals.
Video signals are recorded only on the surface.
本発明はデジタル信号の記録再生にはアナログ信号の記
録再生はど５７Ｎ−５，）必要とし力いことに着目し、
映像信号が記録された記録層６ｂの浅層部分に広帯域の
デジタル信号を記録し、デジタル信号記録層６ａとする
。なお、第３図中の７はベースフィルムを示す。デジタ
ル信号の再生には、Ｓ／Ｎが１５＋ｉＢあれば１０ 程
度の符号誤り率となり実用的な値に近づく。余裕をもっ
て２０〜３０（ｉＢのＳ／Ｎが確保できれば十分である
。したがって浅層に記録する変調を受けたデジタル信号
はＳ／Ｎが上記値を満足する程度の深さに記録すればよ
い。記録層の深さの制御は記録電流で行なうことができ
、映像信号を最適記録電流（再生出力が最大と々る記録
電流値）で記録するとすれば、デジタル信号の記録電流
はその％〜％でよい。The present invention focuses on the fact that recording and reproducing analog signals is necessary and powerful for recording and reproducing digital signals.
A broadband digital signal is recorded in the shallow layer portion of the recording layer 6b where the video signal is recorded, to form a digital signal recording layer 6a. Note that 7 in FIG. 3 indicates a base film. For reproduction of digital signals, if the S/N is 15+iB, the code error rate will be about 10, which is close to a practical value. It is sufficient to secure a S/N of 20 to 30 (iB) with a margin. Therefore, a modulated digital signal to be recorded in a shallow layer may be recorded at a depth to the extent that the S/N satisfies the above value. The depth of the recording layer can be controlled by the recording current, and if a video signal is recorded at the optimal recording current (the recording current value that gives the maximum reproduction output), the recording current for the digital signal will be % to % of that. That's fine.
当然ながら記録した映像信号のあとから変調したデジタ
ル信号を浅層記録するわけであるから映像信号の再生出
力が低下するが、その程度はデジタル信号の記録電流が
小さいため僅かであり、上記記録電流値を例にとる七２
〜５ｄＢにおさまる。Naturally, since the modulated digital signal is shallowly recorded after the recorded video signal, the playback output of the video signal decreases, but the extent of this is slight because the recording current of the digital signal is small, and the recording current Seventy-two with values as examples
It falls to ~5dB.
しかもテープの表面性による雑音が浅層に記録されたデ
ジタル信号のため映像信号の再生に直接関与しに〈〈な
り変調性雑音が軽減されるため実質、：。Furthermore, since the noise due to the surface nature of the tape is recorded in the shallow layer of the digital signal, it is not directly involved in the reproduction of the video signal, and the modulation noise is effectively reduced.
的な映像信号のＳ／Ｎ低下は２〜３ｄＢ程度にとどまる
。このように先に記録した映像信号のＳ／／Ｎ劣化を小
さく押え、実用的な符号誤り率をもつデ９、、−７・
ところで映像信号とデジタル信号の占有帯域が離れてい
る場合には再生信号からフィルタにより所望の信号を得
ることが可能であるが、両信号が近接している場合や重
々っている場合を考慮すれば映像信号を記録再生する回
転ヘッドのアジマス角とデジタル信号を記録再生する回
転ヘヅドのアジマス角とを異ならせる必要がある。一般
に記録ヘッドのギャップ方向に対して再生ヘッドのギャ
ップ方向がθだけ傾いていると、次のような損失りが生
じることが知られている。The S/N reduction of typical video signals remains at about 2 to 3 dB. In this way, the S//N deterioration of the previously recorded video signal can be suppressed to a minimum and the code error rate can be reduced to a practical level. It is possible to obtain the desired signal from the reproduced signal using a filter, but if you consider cases where the two signals are close to each other or overlap, it is possible to adjust the azimuth angle of the rotating head that records and reproduces the video signal and the digital signal. It is necessary to make the azimuth angle of the rotating head for recording and reproduction different. Generally, it is known that if the gap direction of the reproducing head is inclined by θ with respect to the gap direction of the recording head, the following loss will occur.
ただし、Ｗニドラック幅
λ：記録波長
したがって映像信号用回転ヘッドの再生出力は、デジタ
ル信号記録層６ａに記録されている信号を拾わず映像信
号のみを再生し、デジタル信号用回転ヘッドめ再生出力
は映像信号記録層６ｂの信号を拾わずデジタル信号のみ
を再生するようアジマス角を設定することができる。た
とえば映像用およびデジタル用ヘッドのアジマス角を３
０Ｆ’異ならせることにより実用的なトラック幅で１．
６〜２ＭＨｚ以上の全帯域にわたって両信号の帯域を共
有させることが可能である。However, Wnidrack width λ: recording wavelength Therefore, the reproduction output of the rotary head for video signals reproduces only the video signal without picking up the signal recorded on the digital signal recording layer 6a, and the reproduction output of the rotary head for digital signals is The azimuth angle can be set so that only the digital signal is reproduced without picking up the signal from the video signal recording layer 6b. For example, if the azimuth angle of the video and digital heads is set to 3
1. Practical track width by varying 0F'.
It is possible to share the band of both signals over the entire band of 6 to 2 MHz or more.
第４図は、本発明にょる一実施例の周波数アロケーショ
ン図である。この例は現存する民生用ＶＴＲに音声の符
号変調（ＰＧＭ）記録を可能とするものであり、デジタ
ル信号用記録再生ヘッドのギャップ長を少し短かくして
従来の記録可能帯域を高域側に少し伸ばしている。FIG. 4 is a frequency allocation diagram of an embodiment according to the present invention. This example enables code modulation (PGM) recording of audio on existing consumer VTRs, and by slightly shortening the gap length of the digital signal recording/playback head, the conventional recordable band is slightly extended toward the high frequency side. ing.
音声信号は、その忠実度が最も高く維持されるＰＣＭを
行なう。音声帯域２０ＫＨｚを１４ビツトでＡＤ変換し
２チャンネル分を合成し符号誤り訂正ビットを付加すれ
ば２ ＭＢ／ｓｅａのビットレートに変換できる。これ
をＮＲＺ符号に変換すれば約１ＭＨｚの基底帯域幅で済
む。The audio signal undergoes PCM where its fidelity is best preserved. If the audio band of 20 KHz is AD converted with 14 bits, the two channels are combined, and a code error correction bit is added, it can be converted to a bit rate of 2 MB/sea. If this is converted into an NRZ code, the base bandwidth will be about 1 MHz.
第４図は、とのＰＣＭされた約１ＭＨｚの基底帯域幅を
有する音声信号の記録方法を示しており、周波数変調し
た輝度信号１と低域変換した搬送色信号２を周波数多重
して第３図の映像信号記録層１１．７
６ｂとデジタル信号記録層６ａを含む層に記録する。そ
のあとＰＣＭ音声信号を振幅変調し、６〜８ＭＨｚの帯
域に変換した信号８をデジタル信号記録層６ａに記録す
ることにより同トラック上に映像信号と振幅変調したＰ
ＣＭ音声信号が重ね記録される。この場合、映像信号と
ＰＣＭ音声信号の占有帯域が一部重なることになるが、
前述したアジマス損失によりお互いの再生に対する不要
成分は押えられる。変調されたＰＣＭ音声信号から見れ
ば映像信号は妨害成分であり、その大きさはデビエイシ
ョン部分が最も太きい。第４図の実施例では、レベルが
低く記録されている変調されだＰＣＭ音声信号８は例え
ば６ ＭＨｚ以上のノーイパスフィルタを通すことによ
り分離することも可能でその場合妨害波として成分の大
きい映像信号のデビエイション部分はいっそう減衰させ
ることができ音声信号の再生が容易となる。第４図に示
した周波数アロケーションの場合、映像信号のＳ／Ｎ劣
化は２〜３ｄＢにとど捷り、約２ＭＢ／Ｓｈｏ、のデジ
タル信号が記録可能なわけであり、たとえば音声信号を
ＰＣＭしてデジタル記録できることを意味しており、第
１図、第２図の従来例で説明した音声ＦＭ記録に比較し
、はるかに優れた音声信号の記録再生が可能となること
を示している。もちろんデジタル信号はＰＣＭ音声信号
以外にも利用することができる。まだ記録可能帯域につ
いては金属テープなどを使用して従来帯域より伸ばし本
実施例を適用することも可能である。FIG. 4 shows a method for recording an audio signal having a base bandwidth of about 1 MHz, which has been subjected to PCM, and frequency-modulated luminance signal 1 and low-frequency converted carrier color signal 2 are frequency-multiplexed to produce a third signal. Recording is performed in a layer including a video signal recording layer 11.7 6b and a digital signal recording layer 6a in the figure. After that, the PCM audio signal is amplitude-modulated and the signal 8 converted to a band of 6 to 8 MHz is recorded on the digital signal recording layer 6a, thereby recording the amplitude-modulated PCM audio signal and the video signal on the same track.
CM audio signals are recorded overlappingly. In this case, the occupied bands of the video signal and the PCM audio signal will partially overlap,
Unnecessary components for mutual reproduction are suppressed by the azimuth loss described above. When viewed from the modulated PCM audio signal, the video signal is an interference component, and its magnitude is greatest in the deviation portion. In the embodiment shown in FIG. 4, the modulated PCM audio signal 8 recorded at a low level can be separated by passing it through a no-pass filter of, for example, 6 MHz or higher. The deviation portion of the signal can be further attenuated, making it easier to reproduce the audio signal. In the case of the frequency allocation shown in Figure 4, the S/N deterioration of the video signal is only 2 to 3 dB, and a digital signal of about 2 MB/Sho can be recorded. This means that it is possible to digitally record audio signals, and this shows that it is possible to record and reproduce audio signals much better than the audio FM recording described in the conventional example of FIGS. 1 and 2. Of course, digital signals can be used for other purposes than PCM audio signals. As for the recordable band, it is also possible to apply this embodiment by extending the band from the conventional band by using a metal tape or the like.
第６図は、本発明による他の実施例の周波数アロケーシ
ョン図である。この例は記録可能帯域が従来ＶＴＲのま
までＰＣ！音声信号記録を実現しようとするものである
。第４図の実施例と異なる点１４ＰｃＭされた約１ＭＨ
ｚ帯域を有する音声信号は９に示すように周波数変調し
て輝度信号１のデビエーションとほぼ同帯域に映像信号
のあとから記録される。この場合、映像信号と周波数変
調されだＰＣＭ音声信号はアジマス損失によって分離さ
れることになるがアジマス角が小さいと互いにクロスト
ークを生じ妨、害成分となる。しかしながら妨害成分の
大きいデビエーション部分は互いに周波数変調のキャリ
アー周波数近傍であり、周波数変調の三角ノイズの性質
から映像信号、ＰＣＭ音声信号ともほとんどＳ／Ｎ劣化
なく再生することが可能である。この場合、記録可能帯
域を広げること々（’ＰＧＭＰＣＭ音声信号することが
できるわけであり、狭帯域の民生用ＶＴＲにも十分適用
可能である。またＰＣＭ音声信号は周波数変調して記録
されるため磁気記録における周波数変調の数々の特徴が
生かされるのはもちろんである。FIG. 6 is a frequency allocation diagram of another embodiment according to the present invention. In this example, the recordable bandwidth remains the same as that of a conventional VTR, but it can be recorded on a PC! This is an attempt to realize audio signal recording. Approximately 1MH with 14PcM difference from the embodiment shown in FIG.
The audio signal having the z band is frequency modulated as shown in 9 and is recorded after the video signal in approximately the same band as the deviation of the luminance signal 1. In this case, the video signal and the frequency-modulated PCM audio signal are separated by azimuth loss, but if the azimuth angle is small, crosstalk occurs with each other and becomes a disturbance or harmful component. However, the deviation parts with large interference components are close to the carrier frequency of the frequency modulation, and due to the nature of the triangular noise of the frequency modulation, it is possible to reproduce both the video signal and the PCM audio signal with almost no S/N deterioration. In this case, the recordable band can be expanded ('PGMPCM audio signals can be recorded, which is fully applicable to narrowband consumer VTRs. Also, since PCM audio signals are frequency-modulated and recorded, Of course, many features of frequency modulation in magnetic recording can be utilized.
実施例では基底帯域のデジタル信号を振幅変調や周波数
変調をして輝度信号が記録されたトラック上の浅層部に
重ね記録しているが、デジタル信号の変調方式は、他の
どのようなものであっても適用しうる。In the embodiment, the baseband digital signal is amplitude-modulated and frequency-modulated and recorded in a shallow layer on the track where the luminance signal is recorded, but any other modulation method for the digital signal may be used. It can be applied even if
第６図は本発明の磁気記録再生方法を実現するだめの回
転２ヘッド群の構成例を示す図である。磁気テープ１０
が矢印方向Ａに走行し、回転シリンダ１５が矢印Ｂ方向
に３０Ｈ２で回転する、いわゆる回転へソドヘリカル式
ＶＴＲである。この場合、映像信号ヘッド１３はデジタ
ル信号ヘッド１１より先にテープに対接し、映像信号ヘ
ッド１４はデジタル信号ヘッド１２より先にテープに対
接する。そして、たとえば映像信号ヘッド１３および１
４のアジマス角は±６に設定しておき、デジタルヘッド
１１および１２のアジマス角は±３０とする。この構成
により、磁気テープ上のトラックには先に映像信号が記
録され、そのあと浅層部に別アジマスヘッドによりデジ
タル信号が変調を受けて記録される。各ヘッドの記録電
流は、映像信号ヘッド１３．１４は最適記録電流に設定
し、デジタル信号ヘッドには上記最適電流の数分の１を
供給し、変調を受けたデジタル信号は浅層部分にのみ記
録されるように設定する。FIG. 6 is a diagram showing an example of the configuration of a two-rotation head group for realizing the magnetic recording and reproducing method of the present invention. magnetic tape 10
This is a so-called rotating helical type VTR in which the rotary cylinder 15 rotates in the direction of arrow A at a speed of 30H2. In this case, the video signal head 13 contacts the tape before the digital signal head 11, and the video signal head 14 contacts the tape before the digital signal head 12. For example, the video signal heads 13 and 1
The azimuth angle of the digital heads 11 and 12 is set to ±6, and the azimuth angle of the digital heads 11 and 12 is set to ±30. With this configuration, a video signal is first recorded on the track on the magnetic tape, and then a digital signal is modulated and recorded in the shallow layer by a separate azimuth head. The recording current of each head is set to the optimal recording current for the video signal heads 13 and 14, and a fraction of the above optimal current is supplied to the digital signal head, and the modulated digital signal is applied only to the shallow layer. Set it to be recorded.
第７図は本発明の一実施例の要部ブロック構成図である
。同図において端子１７には映像信号が与えられ、記録
側映像処理回路１８を経て記録増幅器１９で増幅され、
回転ヘッド１３．１４を通して磁気テープに記録される
。記録側映像処理回路１８は輝度信号を周波数変調し、
搬送色信号を低域変換し、第４図および第５図に示す輝
度信号１および搬送色信号２の周波数帯域に変換する。FIG. 7 is a block diagram of main parts of an embodiment of the present invention. In the figure, a video signal is applied to a terminal 17, passes through a recording side video processing circuit 18, is amplified by a recording amplifier 19,
The information is recorded on the magnetic tape through rotating heads 13, 14. The recording side video processing circuit 18 frequency-modulates the luminance signal,
The carrier chrominance signal is low-band converted to the frequency bands of the luminance signal 1 and the carrier chrominance signal 2 shown in FIGS. 4 and 5.
次に端子２０に与えられた音声信号は符号変調器２１で
ＰＣＭされ、ローパスフィルタ（ＬＰＦ）２７で必要帯
域のみに制限され、変調器２８で例えば周波数変調して
第５図の９で示す信号に変換され、記録増幅器２２で増
幅され、回転ヘッド１１゜１２を通して磁気テープに記
録される。Next, the audio signal applied to the terminal 20 is subjected to PCM by a code modulator 21, limited to only the necessary band by a low-pass filter (LPF) 27, and frequency-modulated by a modulator 28 to produce a signal shown at 9 in FIG. The signal is amplified by the recording amplifier 22, and recorded on the magnetic tape through the rotary heads 11 and 12.
磁気テープに記録された映像信号と周波数変調されたデ
ジタル化音声信号をアジマス角を異ならせたそれぞれの
専用ヘッドで再生する。映像信号は回転ヘッド１３およ
び１４で再生され、増幅器２３で増幅したあと、再生側
映像信号処理回路２４に入力され、元の映像信号に復調
し、端子２５に出力される。音声信号は回転ヘッド１１
および１２で再生され、増幅器２６で増幅したあと復調
器２９で基底帯域のＰＣＭ音声信号に復調される。ＦＭ
復調されたデジタル信号はさらに復号器３０によりアナ
ログ信号、つまり音声信号に復号され、ローパスフィル
タ（ＬＰＦ）３１を経て端子３２に出力される。Video signals recorded on magnetic tape and frequency-modulated digitized audio signals are played back using dedicated heads with different azimuth angles. The video signal is reproduced by the rotary heads 13 and 14, amplified by an amplifier 23, and then input to a reproduction side video signal processing circuit 24, demodulated to the original video signal, and output to a terminal 25. The audio signal is sent from the rotating head 11.
and 12, amplified by an amplifier 26, and then demodulated by a demodulator 29 into a baseband PCM audio signal. FM
The demodulated digital signal is further decoded by a decoder 30 into an analog signal, that is, an audio signal, which is output to a terminal 32 via a low-pass filter (LPF) 31.
本実施例の場合、デジタル化された音声信号は、磁性層
のごく表面部に記録されているため、弱い記録電流で新
だな信号に書き換えることが容易であるし、寸だ、消去
も容易に行なうことができる。In the case of this example, since the digitized audio signal is recorded on the very surface of the magnetic layer, it is easy to rewrite it to a new signal with a weak recording current, and it is also easy to erase it. can be done.
消去捷たは再記録の電流を適当に設定すれば映像信号へ
与える影響けほとんどない。If the erasing or re-recording current is set appropriately, it will have almost no effect on the video signal.
発明の効果
以上詳述したように、本発明は映像信号を記録したトラ
ック上に映像信号の記録ヘッドとアジマス角が異なるヘ
ッドによりデジタル信号を変調して浅層記録し、互いに
アジマス角の異なるヘッドにより映像信号およびデジタ
ル信号を別々に再生することができるものであり、映像
信号の品質劣化をほとんど生じるとと々く別のデジタル
信号を記録することができる。すなわち磁性層の深さ方
向に対する記録層を記録電流で制御し、両信号間の分離
はアジマス損失を利用して行なうものであり、極めて高
密度な記録方法であるといえる。Effects of the Invention As detailed above, the present invention modulates and records digital signals in a shallow layer on a track on which a video signal is recorded by a head with a different azimuth angle from the recording head of the video signal, The video signal and the digital signal can be reproduced separately, and as soon as the quality of the video signal is almost degraded, another digital signal can be recorded. That is, the recording layer in the depth direction of the magnetic layer is controlled by a recording current, and separation between both signals is performed using azimuth loss, which can be said to be an extremely high-density recording method.
浅層に記録されるデジタル信号は、映像信号との帯域共
有が可能であり、極めて広帯域なものが１７へ−７・
実現し得るし、浅層にあるため消去および書き換えが容
易であるという優れた特長ももつ。したがって音声のＰ
ＧＭ記録にこのデジタル信号を利用することは容易であ
シ、その場合、音声信号のＳ／Ｎ、周波数特性、ひずみ
率、ワウ、フラッタなどの性能が著しく向上するととも
に、従来のＦＭ音声記録では不可能であったアフターレ
コーディ 。The digital signal recorded in the shallow layer can share the band with the video signal, making it possible to achieve an extremely wide band, and it also has the advantage of being easy to erase and rewrite because it is in the shallow layer. It also has other features. Therefore, the voice P
It is easy to use this digital signal for GM recording, and in that case, the performance of the audio signal in terms of S/N, frequency characteristics, distortion rate, wow, flutter, etc. will be significantly improved, and conventional FM audio recording will An after-record that was impossible.
ングも可能となり、極めて優れた音質をもつＶＴＲが実
現できる。This also makes it possible to create a VTR with extremely excellent sound quality.
第１図および第２図はそれぞれ従来例を説明するための
周波数アロケーション図と磁気テープ′深さ方向の記録
状態図、第３図は本発明の原理を説 明するための磁性
層深さ方向の記録状態図、第４図、第５図は実施例の周
波数アロケーションを示す図、第６図は本発明に用いる
磁気ヘッド群の構成を示す図、第７図は本発明による磁
気記録再生方法を用いた装置の要部ブロック構成図であ
る。
１・・・・・・ＦＭ輝度信号、２・・・・・・低域変換
搬送色信号、６・・・・・・磁性層、６＆・・・・・・
デジタル信号記録層、６ｂ・・・・・・映像信号記録層
、１０・・・・・・磁気テープ、１１．１２・・・・・
・デジタル信号ヘッド、１３．１４・・・・・・映像信
号ヘッド、１６・・印・回転シリンダ、３・・・・・・
被変調デジタル信号、４・・・・・・周波数変調された
ＰＣＭ音声信号。
代理人の氏名 弁理士 中 尾 敏 男 はが１名第１
図
／ｆｌ破歓（朋ＺＪ
第２図
第３図Figures 1 and 2 are a frequency allocation diagram and a recording state diagram in the depth direction of a magnetic tape, respectively, to explain the conventional example, and Figure 3 is a diagram in the depth direction of the magnetic layer to explain the principle of the present invention. FIG. 4 and FIG. 5 are diagrams showing the frequency allocation of the embodiment, FIG. 6 is a diagram showing the configuration of the magnetic head group used in the present invention, and FIG. 7 is a diagram showing the magnetic recording and reproducing method according to the present invention. FIG. 2 is a block diagram of main parts of a device using. 1...FM luminance signal, 2...Low frequency conversion carrier color signal, 6...Magnetic layer, 6 &...
Digital signal recording layer, 6b...Video signal recording layer, 10...Magnetic tape, 11.12...
・Digital signal head, 13.14...Video signal head, 16...mark ・Rotating cylinder, 3...
Modulated digital signal, 4... Frequency modulated PCM audio signal. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure/fl Hakan (Tomo ZJ Figure 2 Figure 3
Claims (8)
録ヘッドとアジマス角が異なるヘッドによりデジタル信
号を変調して重ね記録し、互いにアジマス角の異なるヘ
ッドにより映像信号およびデジタル信号を再生すること
を特徴とする磁気記録再生方法。(1) On a track where a video signal is recorded, a digital signal is modulated and overlaid by a head having a different azimuth angle from the recording head for the video signal, and the digital signal is overwritten, and the video signal and the digital signal are reproduced by heads having different azimuth angles. A magnetic recording and reproducing method characterized by:
た搬送色信号で構成し、デジタル信号より先に記録する
ことを特徴とする特許請求の範囲第（１）項記載の磁気
記録再生方法。(2) The magnetic recording and reproducing method according to claim (1), wherein the video signal is composed of a frequency-modulated luminance signal and a low-frequency-converted carrier color signal, and is recorded before the digital signal. .
録することを特徴とする特許請求の範囲第（１）項記載
の磁気記録再生方法。(3) The magnetic recording and reproducing method according to claim (1), wherein the digital signal is amplitude-modulated and recorded after the video signal.
記録することを特徴とする特許請求の範囲第（１）項記
載の磁気記録再生方法。(4) The magnetic recording and reproducing method according to claim (1), wherein the digital signal is frequency-modulated and recorded after the video signal.
域の高域側に配置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方法。(5) The magnetic recording and reproducing method according to claim (1), characterized in that the modulated digital signal is placed on the higher side of the occupied band of the video signal.
れた映像信号とほぼ同帯域に配置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方法。(6) The magnetic recording and reproducing method according to claim (1), characterized in that the frequency-modulated digital signal is arranged in substantially the same band as the frequency-modulated video signal.
ル信号の記録電流を小さく設定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方法。(7) The magnetic recording and reproducing method according to claim (1), characterized in that the recording current of the modulated digital signal is set smaller than the recording current of the video signal.
ることを特徴とする特許請求の範囲第（１）項記載の磁
気記録再生方法。(8) The magnetic recording and reproducing method according to claim (1), wherein the digital signal is a signal obtained by code-modulating an audio signal.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16171384A JPS6139784A (en) | 1984-07-31 | 1984-07-31 | Magnetic recording and reproducing method |
| US06/675,395 US4679097A (en) | 1983-11-30 | 1984-11-27 | Method of recording and reproducing video and audio signals on a magnetic tape |
| EP84308256A EP0143654B1 (en) | 1983-11-30 | 1984-11-28 | Magnetic recording and reproducing method and apparatus for carrying out such a method |
| KR1019840007445A KR890003197B1 (en) | 1983-11-30 | 1984-11-28 | Method of writting recording |
| DE8484308256T DE3482067D1 (en) | 1983-11-30 | 1984-11-28 | METHOD FOR MAGNETIC RECORDING AND PLAYBACK AND ARRANGEMENT FOR REALIZING THE METHOD. |
| AU35953/84A AU556113B2 (en) | 1983-11-30 | 1984-11-28 | Analog/digital video/audio recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16171384A JPS6139784A (en) | 1984-07-31 | 1984-07-31 | Magnetic recording and reproducing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6139784A true JPS6139784A (en) | 1986-02-25 |
Family
ID=15740460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16171384A Pending JPS6139784A (en) | 1983-11-30 | 1984-07-31 | Magnetic recording and reproducing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6139784A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6459848B1 (en) | 1997-08-06 | 2002-10-01 | Victor Company Of Japan, Ltd. | Magnetic recording apparatus and method, and magnetic recording medium |
-
1984
- 1984-07-31 JP JP16171384A patent/JPS6139784A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6459848B1 (en) | 1997-08-06 | 2002-10-01 | Victor Company Of Japan, Ltd. | Magnetic recording apparatus and method, and magnetic recording medium |
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