JPS61140286A - Magnetic recording and reproducing method - Google Patents
Magnetic recording and reproducing methodInfo
- Publication number
- JPS61140286A JPS61140286A JP59262112A JP26211284A JPS61140286A JP S61140286 A JPS61140286 A JP S61140286A JP 59262112 A JP59262112 A JP 59262112A JP 26211284 A JP26211284 A JP 26211284A JP S61140286 A JPS61140286 A JP S61140286A
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- recording
- signal
- recorded
- head
- audio
- Prior art date
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Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はビデオテープレコーダ（以下ＶＴＲと称す）に
おける音声信号の品質を向上させることができるばかり
でなく記録媒体への記録密度を向上させることが可能な
磁気記録再生方法に関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention can not only improve the quality of audio signals in video tape recorders (hereinafter referred to as VTR), but also improve the recording density on recording media. This invention relates to a magnetic recording and reproducing method.
従来の技術
従来のＶＴＲにおいては映像信号は回転ヘッドにより、
音声信号は固定ヘッドによりそれぞれ磁気テープ上の専
用トラックに記録されていた。ところがＶＴＲの長時間
化にともないテープ走行速度が遅くなってきており、そ
の場合、音声信号の周波数特性やＳ／Ｎが劣化すること
になり、良質な再生音が得られない、という問題があっ
た。低テープ速度においても良質な再生音を得るために
、ＶＴＲのビデオトラックに、音声信号を変調して記録
しようとする方法（例えば電子退会磁気記録研究会資料
ＭＲ８３−１９，９〜１４ページ）が実用化されてきて
いる。その記録方式における周波数アロケーションを第
５図に、そして磁気テープの深さ方向への記録状態図を
第６図に示す。BACKGROUND OF THE INVENTION In conventional VTRs, video signals are transmitted by a rotating head.
Each audio signal was recorded on a dedicated track on the magnetic tape by a fixed head. However, as the length of time for VTRs increases, the tape running speed has become slower.In this case, the frequency characteristics and S/N of the audio signal deteriorate, resulting in the problem of not being able to obtain high-quality playback sound. Ta. In order to obtain high-quality playback sound even at low tape speeds, there is a method of modulating and recording audio signals on the video track of a VTR (e.g. Electronic Magnetic Recording Study Group material MR83-19, pages 9-14). It is being put into practical use. FIG. 5 shows the frequency allocation in this recording method, and FIG. 6 shows the recording state in the depth direction of the magnetic tape.
第５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）した信号であシ、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. 5, 1 is a luminance signal containing a frequency-modulated synchronization signal, and 2 is a low-band-converted carrier color signal. 3 is a signal obtained by frequency modulating (FM) 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 an audio dedicated head at an azimuth angle different from that of the video signal head. Ru.
第６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に記録され、映像信号はそのあとから磁性層
４の表層４ｂに記録されることになる。なお、６はベー
スフィ７レムを示す。As is clear from FIG. 6, 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 in the surface layer 4b of the magnetic layer 4. Note that 6 indicates base file 7 rem.
このような従来例の場合、音声信号はＦＭ記録されるた
めＳ／Ｎが大きくとれ、品質がよい上に、テープ走行速
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 audio signal is recorded in FM, so the S/N ratio is high, the quality is good, and the sound quality does not deteriorate even if the tape running speed is slowed down, so it is suitable for long-term VTR recording. It can be said that this is one of the most effective recording methods. Moreover, it is noteworthy that it utilizes the deep layer of the magnetic tape magnetic layer, which was not previously used.
しかしながら最近は、コンパクトディスクや放送衛星に
よる音声ＰＧＭ放送など高品質な音声ソースに接する機
会が多く、上述したＶＴＲの音声記録方式では十分満足
できないという声が強くなってきている。その主たる点
はヘッド切換ノイズの発生、ひずみ率が高い、アフタレ
コーディングが不可能などの点である。However, in recent years, there have been many opportunities to come into contact with high-quality audio sources such as compact discs and audio PGM broadcasts by broadcasting satellites, and there has been a growing consensus that the above-mentioned VTR audio recording system is not fully satisfactory. The main points are that head switching noise occurs, the distortion rate is high, and after-recording is impossible.
これらの問題点を一掃するには音声のＰＣＭ記録がよい
わけであるが、現在の民生用ＶＴＲではＰＣＭ化した広
帯域の音声信号を映像信号に付加して記録するだけの記
録密度がないと言える。PCM recording of audio is a good way to eliminate these problems, but current consumer VTRs do not have the recording density to record PCM wideband audio signals added to video signals. .
発明が解決しようとする問題点
以上のようにＶＴＲの高音質化を計るためには音声のＰ
ＣＭ記録が最も優れているが従来の民生用ＶＴＲでは映
像信号とともに音声ＰＧＭ信号を記録することは記録帯
域の点で不可能であるため音声のＦＭ記録が採用されて
いるのが実情で必ずしも満足のいく音声品質が得られて
いないという問題点があった。As mentioned above, in order to improve the sound quality of a VTR, it is necessary to improve the sound P.
CM recording is the best, but since it is impossible to record audio PGM signals along with video signals with conventional consumer VTRs due to recording bandwidth, FM recording of audio is adopted, which is not always satisfactory. There was a problem in that the audio quality was not as good as it could be.
本発明は上記問題点に鑑み、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声信号をＰＣＭした広帯域
なデジタル信号を記録して’ｌ／ＴＨの高音質化を実現
するとともに従来のＦＭ記録方式との互換性がとれるよ
う配慮されたもので、ＦＭ音声記録とＰＧＭ音声記録の
両立が可能な磁気記録再生方法を提供するとともに磁気
記録における高記録密度を実現することができるもので
ある。In view of the above-mentioned problems, the present invention records a wideband digital signal obtained by PCM'ing an audio signal in a shallow layer on a video track where a video signal is recorded, thereby achieving high sound quality of 'l/TH, and It is designed to be compatible with the FM recording system of It is.
問題点を解決するだめの手段
上記問題点を解決するために本発明の磁気記録再生方法
は、磁性媒体上に第１のヘッドにより第１の信号を記録
し、記録したトラック上に第２のヘッドにより第２の信
号を重ね記録し、さらに前記トラック上に第３のヘッド
にょシ第３の信号を重ね記録し、前記第１．第２．第３
の各ヘッドによシ前記第１．第２．第３の信号をそれぞ
れ再生するよう構成したものである。Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing method of the present invention records a first signal on a magnetic medium with a first head, and records a second signal on the recorded track. A second signal is superimposed on the track by the head, a third signal is superimposed on the track, and a third signal is superimposed on the track. Second. Third
For each head of the above-mentioned first. Second. The third signal is configured to be reproduced, respectively.
作用
本発明は上記した構成によって第１のヘッドにより周波
数変調した音声信号（以下ＦＭ音声）を大きな記録レベ
ルで磁性媒体磁性層厚の深層部にまで記録し、その上に
アジマス角の異なる第２のヘッド（よシ映像信号を記録
し、さらに第３のヘッドによシ音声信号を符号変調（Ｐ
ＧＭ）するなどして得たデジタル信号を最も小さな記録
レベルで記録することにより映像信号と同時にＦＭ記録
した音声信号およびＰＣＭ記録した音声信号をそれぞれ
のヘッドから再生することができる。これにより音声Ｆ
Ｍ記録と音声ＰＣＭ記録を、記録時と再生時で全く独立
に使い分けることができる。ため音声ＦＭ記録方式を有
する従来のＶＴＦｔと完全な互換を維持しつつ高性能な
音声ＰＣＭ記録が可能となる。Operation The present invention uses the above-described configuration to record a frequency-modulated audio signal (hereinafter referred to as FM audio) using a first head at a high recording level deep into the magnetic layer thickness of a magnetic medium, and then records a second head having a different azimuth angle. The third head records the video signal, and the third head encodes the audio signal (P
By recording the digital signal obtained by, for example, GM) at the lowest recording level, it is possible to reproduce the FM recorded audio signal and the PCM recorded audio signal from the respective heads at the same time as the video signal. This allows the audio F
M recording and audio PCM recording can be used completely independently during recording and during playback. Therefore, high-performance audio PCM recording is possible while maintaining complete compatibility with the conventional VTFt having the audio FM recording method.
実施例
以下本発明の一実施例の磁気記録再生方法について、図
面を参照しながら説明する。EXAMPLE Hereinafter, a magnetic recording and reproducing method according to an example of the present invention will be described with reference to the drawings.
第４図は本発明の磁気記録再生方法を実現するだめの回
転ヘッド群の構成例を示す図である。磁気テープ１０が
矢印方向ムに走行し、回転シリンダ１５が矢印Ｂ方向に
３０Ｈｚで回転する、いわニル回転２へソドヘリカル式
ＶＴＲである。同図において１３．１４は映像信号記録
再生用ヘッド（以下、映像ヘッドと略す）、８，９は７
Ｍ音声記録再生用へノド（同音声ヘッド）、そして１１
゜１２はデジタル信号記録再生用ヘッド（同デジタルヘ
ッド）である。この場合、テープのあるトラックに対し
、最初に音声ヘッド８が対接し、続いて映像ヘッド１３
．デジタルヘッド１１の順でテープに対接する。同様に
映像ヘッド１４は音声へノド９のあとからテープと対接
し、デジタルヘッド１２より先にテープに対接する。そ
して、たとえば映像ヘッド１３および１４のアジマス角
は±６° に設定しておき、音声ヘッド８，９のアジマ
ス角は±３０’、デジタルヘッド１１．１２のアジマス
角は＋３０°とする。この構成により、磁気テープ１０
上のトラックには、先に音声信号が記録され、続いて映
像信号が別アジマスのヘッドにより記録され、そのおと
浅層部にさらに別アジマスヘッドによりデジタル信号が
記録される。各ヘッドの記録電流は、映像ヘッド１３．
１４は最適記録電流に設定し、音声ヘッド８，９には十
分大きな記録電流を供給し、デジタルヘッド１１．１２
には最適記録電流の数分の１を供給する。その結果、音
声信号は磁性層の深くまで記録されその上に映像信号が
記録され、デジタル信号はテープ表面の浅層部分に浅く
記録される。FIG. 4 is a diagram showing an example of the configuration of a rotary head group for realizing the magnetic recording and reproducing method of the present invention. The magnetic tape 10 runs in the direction of the arrow B, and the rotary cylinder 15 rotates in the direction of the arrow B at a frequency of 30 Hz. In the same figure, 13 and 14 are video signal recording and reproducing heads (hereinafter abbreviated as video heads), and 8 and 9 are 7
M audio recording and playback head (the same audio head), and 11
12 is a digital signal recording/reproducing head (digital head). In this case, the audio head 8 first contacts a certain track of the tape, and then the video head 13
．． The digital head 11 is brought into contact with the tape in this order. Similarly, the video head 14 comes into contact with the tape after the audio head 9 and comes into contact with the tape before the digital head 12. For example, the azimuth angles of the video heads 13 and 14 are set to ±6°, the azimuth angles of the audio heads 8 and 9 are set to ±30', and the azimuth angles of the digital heads 11 and 12 are set to +30°. With this configuration, the magnetic tape 10
In the upper track, an audio signal is first recorded, then a video signal is recorded by a head of another azimuth, and a digital signal is recorded by another azimuth head in the shallower part. The recording current of each head is determined by the image head 13.
14 is set to the optimum recording current, a sufficiently large recording current is supplied to the audio heads 8 and 9, and the digital heads 11 and 12 are set to the optimum recording current.
is supplied with a fraction of the optimum recording current. As a result, audio signals are recorded deep into the magnetic layer, video signals are recorded thereon, and digital signals are recorded shallowly on the shallow layer of the tape surface.
第２図は本発明の詳細な説明するための図で、第４図に
示した回転シリンダ１５を用いて記録した場合の磁性層
深さ方向の記録状態図である。第６図で説明した従来の
７Ｍ音声記録ＶＴＲと同様に、まずＦＭ音声信号が大き
な記録レベルと広いギャップ長をもつヘッドによりテー
プ深層部６ｃにまで記録される。そのあと映像信号の記
録を従来通り最適記録電流にて回転ヘッドによシ磁気テ
ープに記録すると、その記録層の深さは記録波長の０．
２６〜０．３倍であり、現在の民生用ＶＴＲでは０．３
〜０．８μｍの深さにまで記録されていることになる。FIG. 2 is a diagram for explaining the present invention in detail, and is a diagram of the recording state in the depth direction of the magnetic layer when recording is performed using the rotating cylinder 15 shown in FIG. 4. Similar to the conventional 7M audio recording VTR described in FIG. 6, an FM audio signal is first recorded into the deep portion 6c of the tape by a head having a large recording level and a wide gap length. Thereafter, when a video signal is recorded on the magnetic tape by a rotary head at the optimum recording current as in the conventional method, the depth of the recording layer is 0.000000000000000000000000000000000000000000000000000000000000.
26 to 0.3 times, and 0.3 times for current consumer VTRs.
This means that it is recorded to a depth of ~0.8 μm.
一般の磁気テープの磁性層６の厚さが２〜４μｍ であ
ることからすると長波長（低周波帯域）の信号をテープ
深層部に記録する必要がある。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なわれている。Since the thickness of the magnetic layer 6 of a general magnetic tape is 2 to 4 μm, it is necessary to record long wavelength (low frequency band) signals in the deep part of the tape. The shallow layer of the tape magnetic layer is suitable for recording broadband signals, and in fact, video signals are recorded only on the very 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Ｓ／Ｎを必要としないことに着目し、映像信
号が記録された記録層６ｂのさらに浅層部に広帯域のデ
ジタル信号を記録し、デジタル信号記録層６＆とする。The present invention focuses on the fact that recording and reproducing digital signals does not require the same S/N ratio as recording and reproducing analog signals, and records broadband digital signals in a shallower layer of the recording layer 6b where video signals are recorded. and a digital signal recording layer 6 &.
なお、第２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１５ｄＢ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２
０〜３０ｄＢのＳ／Ｎが確保できれば十分である。Note that 7 in FIG. 2 indicates a base film. For reproducing digital signals, if the S/N is 15 dB, the code error rate will be about 10, which is close to a practical value. 2 with plenty of time
It is sufficient if a S/N of 0 to 30 dB can be secured.
したがって浅層に記録するデジタル信号はＳ／Ｎが上記
値を満足する程度の深さに記録すればよい。Therefore, digital signals to be recorded in a shallow layer may be recorded at a depth that satisfies the above-mentioned value for S/N.
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（再生出力が最大となる記録電流
値）で記録するとすれば、デジタル信号の記録電流はそ
のに〜輪でよい。当然ながら記録した映像信号のあとか
ら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
録層が極めて薄いため小さく、上記記録電流値を例にと
ると３〜６ｄＢにおさまる。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くくなり変調性雑音が軽減される
ため実質的な映像信号のＳ／Ｎ低下は２〜３ｄＢ程度に
と°どまる。この深層部に記録されている音声信号の再
生に対し浅層部のデジタル信号ははｉんど影響を与えず
互いのヘッドアジマス角に差をつけておけば十分である
。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２デジタμ信号を、そ
の上に記録することが可能である。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 maximizes the reproduction output), the recording current for the digital signal will be approximately good. Naturally, the digital signal is recorded in a shallow layer after the recorded video signal, so the playback output of the video signal decreases, but the extent of this is small because the digital signal recording layer is extremely thin. It falls within 3 to 6 dB. Moreover, since the noise due to the surface nature of the tape is recorded in the shallow layer of the digital signal, it is difficult to be directly involved in the reproduction of the video signal, and modulation noise is reduced, so the actual S/N reduction of the video signal is 2 to 3 dB. It stays at a moderate level. The digital signal in the shallow layer does not have any influence on the reproduction of the audio signal recorded in the deep layer, and it is sufficient to set the head azimuth angles different from each other. In this way, it is possible to suppress the S/N deterioration of the previously recorded video signal and to record a two-digital μ signal thereon with a practical bit error rate.
ところで映像信号と音声信号、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おるが、両信号が近接してい
る場合や重なっている場合を考慮すれば音声信号、映像
信号およびデジタル信号を記録再生する回転ヘッドのア
ジマス角を互いに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。By the way, when the occupied bands of the video signal, audio signal, and digital signal are far apart, it is possible to obtain the desired signal from the reproduced signal using a filter, but when the two signals are close to each other or overlap, Taking this into account, it is necessary to make the azimuth angles of the rotary heads for recording and reproducing audio signals, video signals, and digital signals different from each other. 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
したがって音声用回転ヘッドの再生出力は、映像信号記
録層６ｂとデジタル記録層ｅ＆に記録されている信号を
拾わず、映像信号用回転ヘッドの再生出力は、デジタｌ
し信号記録層６＆および音声信号記録層６Ｃ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
号用回転ヘッドの再生出力は映像信号記録層６ｂおよび
音声信号記録層６Ｇ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。However, Wnidrack width λ: recording wavelength Therefore, the playback output of the audio rotary head does not pick up the signals recorded on the video signal recording layer 6b and the digital recording layer e&, and the playback output of the video signal rotary head does not pick up the signals recorded on the video signal recording layer 6b and digital recording layer e&. l
It reproduces only the video signal without picking up the signals recorded on the signal recording layer 6& and the audio signal recording layer 6C, and the reproduction output of the digital signal rotary head picks up the signals recorded on the video signal recording layer 6b and the audio signal recording layer 6G. You can set the azimuth angle so that only the digital signal is played without being picked up.
たとえば映像用ヘッドを基準にして音声用ヘッドを＋３
０°とするとデジタル用ヘッドのアジマス角を一３０°
とすることにより実用的なトラック幅で１〜２ ＭＨｚ
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。その結果、第３図に示すように周波数変
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
多重して映像信号記録層６ｂに記録し、それらの信号と
同帯域内にあって広帯域なデジタル信号１６をデジタル
信号記録層６ａに、さらにＦＭ音声信号３は音声信号記
録層６Ｃに記録することができる。第４図に示した周波
数アロケーシヨンの場合、映像信号の５／Ｎ劣化は２〜
３ｄＢにとどまシ、約ａ ＭＨｚのデジタル信号と１．
５ ＭＨｚ近辺のＦＭ音声信号が記録可能なわけであり
、これは、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６図、第６図の従来例で
説明した音声ＦＭ記録が可能であるとともに、それに比
較してはるかに優れた音声信号のＰＣＭ記録再生も可能
となることを示している。For example, the audio head is +3 based on the video head.
If it is 0°, the azimuth angle of the digital head is -30°.
1 to 2 MHz with a practical track width.
It is possible to share the bands of both signals over all the above bands. As a result, as shown in FIG. 3, the frequency-modulated luminance signal 1 and the low frequency-converted carrier chrominance signal 2 are frequency-multiplexed and recorded on the video signal recording layer 6b. The digital signal 16 can be recorded on the digital signal recording layer 6a, and the FM audio signal 3 can be recorded on the audio signal recording layer 6C. In the case of the frequency allocation shown in Figure 4, the 5/N deterioration of the video signal is 2~
The signal remains at 3 dB and is approximately 1 MHz with a digital signal of 1.
FM audio signals around 5 MHz can be recorded, which means that, for example, audio signals can be converted into PCM and digitally recorded. This shows that it is possible to perform PCM recording and reproduction of audio signals, which is much better than that.
以上は３層全てに記録する場合について説明したが、第
１．第２．第３のヘッドを準備しておけばそれらを選択
して２層または１層のみ記録することはもちろん可能で
あシ、任意の層の信号を選択して再生することも可能で
ある。The above description has been about the case of recording on all three layers, but the first layer. Second. If a third head is prepared, it is of course possible to select them and record only two layers or one layer, and it is also possible to select and reproduce signals of any layer.
また、記録層の深さの制御は記録電流で行なう例につい
て説明したが、たとえばヘッドギャップ長をそれぞれ異
ならせて記録レベルを制御し第２図のような記録状態を
実現することも可能である。In addition, although we have explained an example in which the depth of the recording layer is controlled using a recording current, it is also possible to realize a recording state as shown in Figure 2 by controlling the recording level by varying the head gap length, for example. .
第１図は本発明の一実施例の要部ブロック構成図である
。本実施例は、映像信号の記録・再生と同時に音声のＰ
ＣＭ記録・再生が可能であるとともに音声信号が映像信
号の深層部にＦＭ記録されているいわゆるハイファイＶ
ＴＲとも互換性をもたせた構成を示している。同図にお
いて、端子１７には映像信号が与えられ、記録側映像信
号処理回路１８を経て記録増幅器１って増幅され、回転
ヘッド１３．１４を通して磁気テープに記録される。FIG. 1 is a block diagram of main parts of an embodiment of the present invention. In this embodiment, the audio P is recorded and played back simultaneously with the video signal.
So-called high-fidelity V, which is capable of recording and playing commercials and also records FM audio signals deep within the video signal.
It shows a configuration that is compatible with TR. In the figure, a video signal is applied to a terminal 17, passed through a recording side video signal processing circuit 18, amplified by a recording amplifier 1, and recorded on a magnetic tape through rotary heads 13 and 14.
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３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。次に端子２０に
与えられた音声信号はスイッチ２１および２２によシＦ
Ｍ記録またはＰＣＭ記録が選択されて、ＦＭ記録の場合
はＦＭ変調器２３を経て記録増幅器２５で増幅され、回
転ヘッド８，９により磁気テープに記録され、ＰＣＭ記
録の場合はＰＣＭ変調器２４．記録増幅器２６を経て回
転ヘッド１１．１２によシ記録される。The recording side video processing circuit 18 frequency-modulates the luminance signal, performs low frequency conversion on the carrier color signal, and converts it into the frequency bands of the luminance signal 1 and carrier color signal 2 shown in FIG. Next, the audio signal applied to terminal 20 is switched to F by switches 21 and 22.
M recording or PCM recording is selected, and in the case of FM recording, it is amplified by the recording amplifier 25 via the FM modulator 23, and recorded on the magnetic tape by the rotary heads 8 and 9, and in the case of PCM recording, it is amplified by the recording amplifier 25, and in the case of PCM recording, it is amplified by the recording amplifier 25. It is recorded by the rotary head 11.12 via the recording amplifier 26.
次に再生系について説明する。磁気テープに記録された
ＦＭ音声信号、映像信号およびＰＧＭデジタル信号をア
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３５で増幅したあと、再生側映像信号処理回路３６
に入力され、元の映像信号に復調し、端子３７に出力す
る。ＦＭ音声信号は回転ヘッド８および９で再生され、
増幅器２７で増幅したあと７Ｍ復調器２９で音声信号に
復調し、スイッチ３１を経て端子３３に音声信号を出力
する。ＰＣＭデジタル信号は回転ヘッド１１．１２で再
生され、増幅器２８で増幅したあとＰＣＭ復号器３０で
音声信号に復号されスイッチ３２を経て端子３４に音声
信号を出力する。Next, the reproduction system will be explained. FM audio signals, video signals, and PGM digital signals recorded on magnetic tape are reproduced by dedicated heads with different azimuth angles. The video signal is reproduced by the rotary heads 13 and 14, amplified by the amplifier 35, and then sent to the reproduction side video signal processing circuit 36.
The signal is input to the terminal 37, demodulated to the original video signal, and outputted to the terminal 37. The FM audio signal is played by rotating heads 8 and 9;
After being amplified by an amplifier 27, it is demodulated into an audio signal by a 7M demodulator 29, and the audio signal is outputted to a terminal 33 via a switch 31. The PCM digital signal is reproduced by the rotary head 11, 12, amplified by the amplifier 28, decoded into an audio signal by the PCM decoder 30, and outputted to the terminal 34 via the switch 32.
この再生音声信号はｐｃＭｌ、てデジタルで磁気テープ
に記録・再生したものでありテープの特性などに左右さ
れない良質な再生音が得られるのは言うまでもない。This reproduced audio signal is digitally recorded and reproduced on a magnetic tape using pcMl, and it goes without saying that high-quality reproduced sound can be obtained that is not affected by the characteristics of the tape.
本実施例によれば、スイッチ２１を選択して記録したＦ
Ｍ音声は従来の既成ＦＭ音声記録式’／ＴＲで再生する
ことができる。すなわち既成装置では深層に記録された
ＦＭ音声を再生する回転ヘッドおよびＦＭ復調器を備え
ているため音声回転ヘッドのアジマメ角を等しくしてお
くことと回転ヘッドの走査軌跡（テープ上でのトラック
）をほぼ合わせておくことにより十分な互換性を保ちう
る。According to this embodiment, the F recorded by selecting the switch 21
M audio can be reproduced using a conventional FM audio recording system '/TR. In other words, since the existing device is equipped with a rotary head and an FM demodulator for reproducing FM sound recorded in deep layers, it is necessary to keep the same azimuth angle of the sound rotary head and to keep the scanning locus (track on the tape) of the rotary head the same. Sufficient compatibility can be maintained by keeping them almost the same.
逆に、既成装置で深層に７Ｍ音声記録したテープを本実
施例による装置で再生することも可能である。この場合
、回転ヘッド８および９がその信号を拾い、７Ｍ復調器
２９で音声信号を復調する。On the other hand, it is also possible to reproduce a tape on which 7M audio has been recorded deep with an existing device using the device according to this embodiment. In this case, the rotating heads 8 and 9 pick up the signal and the 7M demodulator 29 demodulates the audio signal.
音声ヘッドのアジマメ角およびトラッキング条件を満足
しておく点は先の条件と同じである。以上のように本実
施例では従来のＦＭ音声記録式”／ＴＲと完全互換を成
立させることができるとともに音声信号をさらに高性能
化するＰＣＭ記録・再生をも可能とするのである。The conditions are the same as the previous one, as long as the azimuth angle of the audio head and the tracking conditions are satisfied. As described above, this embodiment can achieve complete compatibility with the conventional FM audio recording type "/TR" and also enables PCM recording and playback that further improves the performance of audio signals.
以上の説明ではデジタ）ｖ信号は音声のＰＣＭ侶号とし
ているが、ＰＧＭ音声の記録・再生が不要であれば他の
どのようなデジタル信号にも利用することが可能で、本
実施例は磁気記録における記録密度を磁性層厚み方向に
著しく向上させたものであるとも言える。In the above explanation, the digital (digital) v signal is referred to as an audio PCM signal, but it can be used with any other digital signal if recording and playback of PGM audio is not required. It can also be said that the recording density in recording is significantly improved in the direction of the thickness of the magnetic layer.
発明の効果
以上のように本実施例によれば、第１のヘッドにより音
声信号を記録し、記録したトラック上に第２のヘッドに
より映像信号を重ね記録し、さらに前記トラック上に第
３のヘッドによりデジタル信号を重ね記録し、前記第１
．第２．第３の各ヘッドにより音声信号、映像信号、デ
ジタル信号をそれぞれ再生するよう構成することにより
、既成フォーマットであるＦＭ音声記録ＶＴＲとの完全
な互換性を維持しつつ第３のヘッドで高性能な音声ＰＣ
Ｍ記録やその他のデジタル信号記録を行なうことができ
高密度磁気記録の一方法として位置づけることができる
ものである。Effects of the Invention As described above, according to this embodiment, an audio signal is recorded by the first head, a video signal is superimposed on the recorded track by the second head, and a third head is recorded on the recorded track. The head records digital signals in a superimposed manner, and the first
．． Second. By configuring the third head to play back audio signals, video signals, and digital signals, the third head can reproduce high-performance signals while maintaining complete compatibility with FM audio recording VTRs, which are existing formats. audio PC
This method can perform M recording and other digital signal recording, and can be positioned as a method for high-density magnetic recording.
第１図は本発明の一実施例における磁気記録再生方法を
適用した装置の構成図、第２図は本発明の詳細な説明す
るだめの磁気テープ深さ方向の記録状態図、第３図は周
波数プロケージ町ンの一例を示す特性図、第４図は本発
明に用いる磁気ヘッド群の構成図、第６図、第６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である。
１３．１４・・・・・・映像用回転ヘッド、８，９・・
・・・・音声用回転ヘッド、１１．１２・・・・・・デ
ジタル信号用回転ヘッド、６・・・・・・磁性層、６Ｃ
・・・・・・音声信号記録層、６ｂ・・・・・・映像信
号記録層、６ａ・・・・・・デジタル信号記録層、３・
・・・・・ＦＭ音声帯域、１６・・・・・・ＰＣＭ信号
帯域、２３・・−・・・ＦＭ変調器、２４・・・・・・
ＰＣＭ変調器、２９・・・・・・ＦＭ復調器、３ｏ・・
・・・・ＰＣＭ復号器。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第２
図
第３図 ３
闇瀘敏 （ｍｙ ］FIG. 1 is a configuration diagram of an apparatus to which a magnetic recording/reproducing method according to an embodiment of the present invention is applied, FIG. 2 is a recording state diagram in the depth direction of a magnetic tape, which is not sufficient to explain the present invention in detail, and FIG. A characteristic diagram showing an example of a frequency program; FIG. 4 is a configuration diagram of a magnetic head group used in the present invention; FIGS. It is a recording state diagram of a direction. 13.14... Image rotating head, 8, 9...
... Rotating head for audio, 11.12 ... Rotating head for digital signal, 6 ... Magnetic layer, 6C
...Audio signal recording layer, 6b...Video signal recording layer, 6a...Digital signal recording layer, 3.
...FM audio band, 16...PCM signal band, 23...FM modulator, 24...
PCM modulator, 29...FM demodulator, 3o...
...PCM decoder. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 3 Satoshi Yamiro (my]
Claims (5)
録し、記録したトラック上に第２のヘッドにより第２の
信号を重ね記録し、さらに前記トラック上に第３のヘッ
ドにより第３の信号を重ね記録し、前記第１，第２，第
３の各ヘッドにより、前記第１，第２，第３の信号をそ
れぞれ再生することを特徴とする磁気記録再生方法。(1) A first head records a first signal on a magnetic medium, a second signal is superimposed on the recorded track by a second head, and a third signal is recorded on the track by a third head. A magnetic recording and reproducing method characterized in that three signals are recorded in an overlapping manner, and the first, second, and third signals are respectively reproduced by the first, second, and third heads.
あって第３の信号をデジタル信号と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 first signal is an audio signal, the second signal is a video signal, and the third signal is a digital signal.
信号であって、第３の信号は音声信号を符号変調したデ
ジタル信号とすることを特徴とする特許請求の範囲第２
項記載の磁気記録再生方法。(3) The first signal is an analog signal obtained by frequency modulating the audio signal, and the third signal is a digital signal obtained by code modulating the audio signal.
2. Magnetic recording and reproducing method described in Section 1.
に異なる回転ヘッド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方法。(4) The magnetic recording and reproducing method according to claim 1, wherein each of the first, second, and third heads is a rotary head having a different azimuth angle.
Ｒ＿２：第２〃 Ｉ＿Ｒ＿３：第３〃 なる関係に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。(5) The relationship between the recording levels by each head is I_R_1>I_R_2>I_R_3 where (I_R_1: recording level by the first head I_
2. The magnetic recording and reproducing method according to claim 1, wherein the relationship is set as follows: R_2: second I_R_3: third.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59262112A JPS61140286A (en) | 1984-12-12 | 1984-12-12 | Magnetic recording and reproducing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59262112A JPS61140286A (en) | 1984-12-12 | 1984-12-12 | Magnetic recording and reproducing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61140286A true JPS61140286A (en) | 1986-06-27 |
Family
ID=17371202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59262112A Pending JPS61140286A (en) | 1984-12-12 | 1984-12-12 | Magnetic recording and reproducing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61140286A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0662426A (en) * | 1991-01-31 | 1994-03-04 | Victor Co Of Japan Ltd | Magnetic recording device and magnetic recording/ reproducing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5194711A (en) * | 1975-02-18 | 1976-08-19 | ||
| JPS58146011A (en) * | 1982-02-22 | 1983-08-31 | Matsushita Electric Ind Co Ltd | Video tape recorder |
| JPS58198973A (en) * | 1982-05-14 | 1983-11-19 | Matsushita Electric Ind Co Ltd | Video tape recorder |
| JPS59103478A (en) * | 1982-12-03 | 1984-06-14 | Sony Corp | Magnetic recording and reproducing device |
-
1984
- 1984-12-12 JP JP59262112A patent/JPS61140286A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5194711A (en) * | 1975-02-18 | 1976-08-19 | ||
| JPS58146011A (en) * | 1982-02-22 | 1983-08-31 | Matsushita Electric Ind Co Ltd | Video tape recorder |
| JPS58198973A (en) * | 1982-05-14 | 1983-11-19 | Matsushita Electric Ind Co Ltd | Video tape recorder |
| JPS59103478A (en) * | 1982-12-03 | 1984-06-14 | Sony Corp | Magnetic recording and reproducing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0662426A (en) * | 1991-01-31 | 1994-03-04 | Victor Co Of Japan Ltd | Magnetic recording device and magnetic recording/ reproducing device |
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