JPS62176393A - Magnetic picture recording system - Google Patents

Magnetic picture recording system

Info

Publication number
JPS62176393A
JPS62176393A JP61018878A JP1887886A JPS62176393A JP S62176393 A JPS62176393 A JP S62176393A JP 61018878 A JP61018878 A JP 61018878A JP 1887886 A JP1887886 A JP 1887886A JP S62176393 A JPS62176393 A JP S62176393A
Authority
JP
Japan
Prior art keywords
signal
signals
luminance signal
phase
frequency component
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
Application number
JP61018878A
Other languages
Japanese (ja)
Inventor
Hiromichi Shibatani
柴谷 弘道
Koji Kamijo
晃司 上條
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Broadcasting Corp
Original Assignee
Nippon Hoso Kyokai NHK
Japan Broadcasting Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Hoso Kyokai NHK, Japan Broadcasting Corp filed Critical Nippon Hoso Kyokai NHK
Priority to JP61018878A priority Critical patent/JPS62176393A/en
Publication of JPS62176393A publication Critical patent/JPS62176393A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To obtain the video signal of high resolution by separating a wide band luminance signal into a low frequency component and a high frequency component, converting the high frequency component into the low frequency component, right angle two phase modulating both low frequency components by a sub-carrier and right angle two phase modulating both chrominance signals by the sub-carrier having a phase shifted by 45 deg.. CONSTITUTION:The luminance signal Y is passed through an LPF 27 to form the low frequency luminance signal YL, the Y signal and the YL signal are applied to a differential amplifier 30 to have the high frequency luminance signal YH, it is guided to a frequency shift circuit 31 to convert into a converted high frequency luminance signal YH'. The output of a crystal oscillator 34 is guided to a 45 deg. phase shifting device 35, the obtained sub-carrier SC' and the signals YL, YH' are guided to the right angle two phase modulator 32 to form the modulated luminance signal Y', the chrominance signals CW and CN are guided to the right angle two phase modulator 33 to obtain the modulated chrominance signal C'. The output of a synchronizing signal generator 37 and a burst signal from a burst forming circuit 36 are supplied to mixing circuits 38, 39, added to the modulated signals Y', C' to form signals Ysb, Csb and they are recorded on a tape 46 by recording heads 44, 45 of two channels through FM modulators 40, 41, and amplifiers 42, 43.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は簡易型VTRなどに好適な磁気録画方式に係り
、特に従来より帯域の広い映像信号を磁気テープ上に少
数チャネルで録画し、複雑な時間軸補正装置(TBC)
なしで再生可能とした磁気録画方式に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording system suitable for simple VTRs, etc., and in particular records a video signal with a wider band than conventionally on a magnetic tape with a small number of channels, thereby reducing the complexity time base correction device (TBC)
This invention relates to a magnetic recording method that allows playback without the use of magnetic tape.

〔従来の技術〕[Conventional technology]

従来から、家庭用などの簡易型VTRは、(CO)γ−
FeJ3などの酸化物磁性粉塗布型テープ(酸化物テー
プ)、フェライトコアヘッド(フェライトヘッド)、低
域変換カラー信号記録方式(日本放送協会編放送技術双
書rVTR技術」第176頁参照)による信号処理回路
の組み合せで構成されている。
Traditionally, simple VTRs for home use, etc., have (CO)γ-
Signal processing using oxide magnetic powder coated tape (oxide tape) such as FeJ3, ferrite core head (ferrite head), and low-frequency conversion color signal recording method (see page 176 of Broadcasting Technology Book RVTR Technology edited by Japan Broadcasting Corporation) It is made up of a combination of circuits.

第3図は従来の簡易型VTRの映像信号系ブロックを、
第4図はその記録信号周波数配列を示す。
Figure 3 shows the video signal system block of a conventional simple VTR.
FIG. 4 shows the recording signal frequency array.

第3図において、1はローパスフィルタ(LPF) 、
2はバントパスフィルタ(口PF) 、  3はY/C
分1411回路、4はFM変調器、5は局部発振器、6
は周波数シフト回路、7は加算器、8は記録増幅器、9
は記録ヘッド、lOはテープ、11は再生ヘッド、12
は再生増幅器、13はバイパスフィルタ(HPF) 、
+4はローパスフィルタ(LPF) 、15はFM復調
器、16は周波数シフト回路、17は周波数変換器、1
8は電圧制御発振器(Vfl:0) 、19は位相比較
器、20は局部発振器、21は同期分離回路、22はロ
ーパスフィルタ、23はバンドパスフィルタ、24は加
算器、25はY/C合成回路である。
In FIG. 3, 1 is a low-pass filter (LPF),
2 is a band pass filter (mouth PF), 3 is Y/C
1411 circuits, 4 is FM modulator, 5 is local oscillator, 6 is
is a frequency shift circuit, 7 is an adder, 8 is a recording amplifier, 9
is the recording head, lO is the tape, 11 is the playback head, 12
is a regenerative amplifier, 13 is a bypass filter (HPF),
+4 is a low pass filter (LPF), 15 is an FM demodulator, 16 is a frequency shift circuit, 17 is a frequency converter, 1
8 is a voltage controlled oscillator (Vfl: 0), 19 is a phase comparator, 20 is a local oscillator, 21 is a synchronous separation circuit, 22 is a low-pass filter, 23 is a band-pass filter, 24 is an adder, 25 is a Y/C synthesizer It is a circuit.

従来の酸化物テープおよびフェライトヘッドの組み合せ
において、最短記録波長は0.8μmであり、記録周波
数の上限は〔記録周波数=相対速度/記録波長〕の関係
から、テープヘッド相対速度(相対速度)が7 m/s
のとき約8.5Ml+zとなる。
In the combination of conventional oxide tape and ferrite head, the shortest recording wavelength is 0.8 μm, and the upper limit of the recording frequency is determined by the relationship of [recording frequency = relative speed / recording wavelength], so the relative speed (relative speed) of the tape head is 7 m/s
When this happens, it becomes approximately 8.5Ml+z.

[発明が解決しようとする問題点] 上述したように、従来のテープ・ヘッド系である酸化物
テープとフェライトヘッドとの組み合せでは、最短記録
波長か0.8μmであったが、最近実用化され始めたF
e、Goなどのメタル粉末塗布型テープ(メタルテープ
)、あるいは現在研究開発の途上にあるFe、Goなど
の蒸着テープ、Daミツエライト微結晶塗布型テープと
センダスト(Fe−5i−A1合金)などをコアとする
メタルヘラS9の組み合わせでは、最短記録波長は0.
4μmまで短縮され、相対速度が7 m/sの場合、記
録周波数の上限は17.5MHzに達する。
[Problems to be solved by the invention] As mentioned above, in the combination of an oxide tape and a ferrite head, which is a conventional tape/head system, the shortest recording wavelength was 0.8 μm, but recently it has been put into practical use. Started F
Metal powder coated tapes (metal tapes) such as e and Go, evaporated tapes such as Fe and Go which are currently in the process of research and development, Da Mitsuelite microcrystal coated tapes and Sendust (Fe-5i-A1 alloy), etc. In the combination of the metal spatula S9 as the core, the shortest recording wavelength is 0.
When shortened to 4 μm and the relative velocity is 7 m/s, the upper limit of the recording frequency reaches 17.5 MHz.

従来の技術に関して先に述べたように、記録周波数の上
限が約8.5MHzの場合、記録信号の周波数配列では
第4図のようになり、輝度(Y)信号の帯域は3MHz
、色(C)信号の帯域は650kl(zと狭いものであ
る。
As mentioned earlier regarding the conventional technology, when the upper limit of the recording frequency is approximately 8.5 MHz, the frequency arrangement of the recording signal is as shown in Fig. 4, and the band of the luminance (Y) signal is 3 MHz.
, the band of the color (C) signal is as narrow as 650 kl (z).

よって本発明の目的は、テープとヘッドの相対速度を従
来と同じに保ったまま、記録再生できる周波数帯域を、
例えば輝度信号については2倍、クロミナンス信号につ
いては5倍まで引き上げ、もって従来に比してはるかに
解像度の高い映像信号を得るようにした磁気録画方式を
提供することにある。
Therefore, an object of the present invention is to increase the frequency band in which recording and playback can be performed while keeping the relative speed between the tape and the head the same as before.
For example, the object of the present invention is to provide a magnetic recording system that increases the luminance signal by twice and the chrominance signal by up to five times, thereby obtaining a video signal with a much higher resolution than the conventional one.

例えば、木発明を実施することにより、記録周波数の上
限が17.5M)lzに達する新らしいテープヘッド系
を有効に利用して、Y信号帯域6MHz。
For example, by implementing the tree invention, a new tape head system with an upper limit of recording frequency reaching 17.5 MHz can be effectively utilized to achieve a Y signal band of 6 MHz.

C信号帯域3 MHzの広帯域映像信号を記録・再生し
ようとするものである。
This is intended to record and reproduce a wideband video signal in the C signal band of 3 MHz.

[問題点を解決するための手段] 本発明に係る磁気録画方式では、録画時においては、広
帯域輝度信号を低域成分および高域成分に分離し、高域
成分を低域変換し、これら両低域信号を副搬送波で直角
2相変調すると共に、広帯域および狭帯域の肉色イ3号
を45°移相した副搬送波で直角2相変調し、バースト
状の副搬送波とともにこれら輝度信号成分および色信号
成分をFM変調記録し、再生時においては、FM復調後
に連続再生した副搬送波で同期検波し、原信号を復元す
るものである。
[Means for Solving the Problems] In the magnetic recording system according to the present invention, during recording, a wideband luminance signal is separated into a low frequency component and a high frequency component, the high frequency component is converted to a low frequency component, and both of these components are separated. The low-frequency signal is quadrature two-phase modulated with a subcarrier, and the wideband and narrowband flesh color A3 are quadrature two-phase modulated with a 45° phase-shifted subcarrier, and these luminance signal components and color are modulated with the burst subcarrier. Signal components are recorded using FM modulation, and during reproduction, synchronous detection is performed using subcarriers that are continuously reproduced after FM demodulation to restore the original signal.

(実施例) 次に、図面を参照して木発明の詳細な説明する。(Example) Next, the tree invention will be described in detail with reference to the drawings.

第1図は、本発明を適用した簡易型VTRの映像信号系
ブロック図である。本図において、26はマトリクス回
路、27,28.29はローパスフィルタ、30は差動
増幅器、31は周波数シフト回路、32.33は直角二
相変調器、34は水晶発振器、35は45゜穆相器、3
6はバースト形成回路、37は同期信号発生器、38.
39は混合回路、40.41はFM変調器、42.43
は記録増幅器、44.45は記録ヘッド、46はテープ
、47.48は再生ヘッド、49.50は再生増幅器、
51.52はRF等化器、53.54はFM復調器、5
5.56は分配器、57.58はバースト抜取回路、5
9.60は電圧制御発振器(Vfl:O) 、61は4
5°移相回路、62.63は同期検波器、64は周波数
シフト回路、65は加算回路、66はマトリクス回路、
67は同期分離回路である。
FIG. 1 is a block diagram of a video signal system of a simple VTR to which the present invention is applied. In this figure, 26 is a matrix circuit, 27, 28, 29 are low-pass filters, 30 is a differential amplifier, 31 is a frequency shift circuit, 32, 33 is a quadrature two-phase modulator, 34 is a crystal oscillator, and 35 is a 45° square Aiki, 3
6 is a burst forming circuit, 37 is a synchronization signal generator, 38.
39 is a mixing circuit, 40.41 is an FM modulator, 42.43
is a recording amplifier, 44.45 is a recording head, 46 is a tape, 47.48 is a playback head, 49.50 is a playback amplifier,
51.52 is an RF equalizer, 53.54 is an FM demodulator, 5
5.56 is a distributor, 57.58 is a burst extraction circuit, 5
9.60 is voltage controlled oscillator (Vfl:O), 61 is 4
5° phase shift circuit, 62.63 is a synchronous detector, 64 is a frequency shift circuit, 65 is an addition circuit, 66 is a matrix circuit,
67 is a synchronous separation circuit.

また、第2図(A)は第1図に示したVTRの記録信号
周波数配列を、第2図(B)は同VTRの記録信号波形
を、第2図(C)は直角二相変調信号Y’  、C’ 
 とバーストBどの位相関係を示す図である。
In addition, Fig. 2 (A) shows the recording signal frequency array of the VTR shown in Fig. 1, Fig. 2 (B) shows the recording signal waveform of the same VTR, and Fig. 2 (C) shows the quadrature two-phase modulation signal. Y', C'
FIG. 3 is a diagram showing the phase relationship between burst B and burst B.

次に、第1図および第2図(A)〜(C)を参照して、
本実施例の動作を説明する。
Next, with reference to FIG. 1 and FIGS. 2 (A) to (C),
The operation of this embodiment will be explained.

まず、カラーカメラからの三原色信号R,G。First, the three primary color signals R and G from the color camera.

B(帯域各々6〜8 M)Iz)をマトリックス回路2
6に導入し、帯域6 MH2の輝度信号Yおよび帯域3
MHzの色信号Cwt、CHを得る。
B (bandwidth 6 to 8 M each) Iz) to matrix circuit 2
6, the luminance signal Y of band 6 MH2 and band 3
MHz color signals Cwt and CH are obtained.

Y信号については、帯域3 MHzの二系統の信号をつ
くるために、最初にローパスフィルタ(遮断周波数3M
)Iz)27を通して周波数スペクトラムが0〜3 M
Hzの低域輝度信号YLを形成する。次に、Y信号とこ
のYL信号とを差動増幅器30に加え、周波数スペクト
ラムが3〜6 MHzの高域輝度信号YHを得る。
For the Y signal, in order to create two signals with a band of 3 MHz, we first applied a low-pass filter (cutoff frequency 3 MHz).
) Iz) The frequency spectrum is 0 to 3 M through 27
A low frequency luminance signal YL of Hz is formed. Next, the Y signal and this YL signal are applied to the differential amplifier 30 to obtain a high frequency luminance signal YH having a frequency spectrum of 3 to 6 MHz.

更に、YH信号を周波数シフト回路31に導入すること
により、周波数スペクトラムが0〜3 MHzである変
換高域輝度信号YH′ に変換する。かくして、帯域0
〜6M)IzのY信号を帯域0〜3MHzの二系統の信
号YLとYH′に分割できる。
Furthermore, by introducing the YH signal into the frequency shift circuit 31, it is converted into a converted high-frequency luminance signal YH' having a frequency spectrum of 0 to 3 MHz. Thus, band 0
~6M) Iz Y signal can be divided into two systems of signals YL and YH' with a band of 0 to 3MHz.

一方、3.58M)lzの水晶発振器34を用意し、こ
の出力を45°移相器35に導入して得た副搬送波sc
′と、上述した二系統の信号(YL 、YH’ ) と
を直角二相変調器32に導き、変調輝度信号Y′を得る
On the other hand, a 3.58 M)lz crystal oscillator 34 is prepared, and its output is introduced into a 45° phase shifter 35 to obtain a subcarrier sc.
' and the aforementioned two systems of signals (YL, YH') are guided to a quadrature two-phase modulator 32 to obtain a modulated luminance signal Y'.

色信号については、各々帯域が3MIIzであるC11
l、  CN信号を別の直角二相変調器33に導き、変
調色信号C′を形成する。このとき、副搬送波には水晶
発振器34の出力を直接使用する。
For color signals, C11 each has a band of 3 MIIz.
1, CN signals to another quadrature two-phase modulator 33 to form a modulated color signal C'. At this time, the output of the crystal oscillator 34 is directly used as the subcarrier.

次いで、同期信号発生器37の出力、ならびに、バース
ト形成回路36から得られる3、58MI(zのバース
ト信号を混合回路38.39に供給することにより、第
2図(B)に示すように変調信号Y′およびC′ に付
加し、もって信号YSb、(:sbを形成する。
Next, by supplying the output of the synchronizing signal generator 37 and the burst signal of 3,58 MI (z) obtained from the burst forming circuit 36 to the mixing circuit 38, 39, the modulation is performed as shown in FIG. 2(B). It is added to signals Y' and C' to form signals YSb, (:sb).

ここで、変調信号Y′およびC′の位相関係は、第2図
(C)に示すとおりである。
Here, the phase relationship between modulated signals Y' and C' is as shown in FIG. 2(C).

信号YsbおよびCsbについては、それぞれFM変調
器40.41でFM変調し、記録増幅器42.43を介
して2チヤネルの記録ヘッド44.45によりテープ4
6に記録する。この記録信号の周波数配列は、第2図(
A)に示すとおりである。
The signals Ysb and Csb are FM modulated by FM modulators 40 and 41, and sent to tape 4 by a two-channel recording head 44 and 45 via recording amplifiers 42 and 43, respectively.
Record in 6. The frequency array of this recording signal is shown in Figure 2 (
As shown in A).

次に、再生ヘッド47.48によりテープ46から再生
された信号は、再生増幅器49.50を介してRF等化
器51.52に導入され、復調に適したRF倍信号等化
される。更に、FM復調器53.54により復調し、復
調信号Ysb’  、Csb’ を得る(第2図(B)
 、(C)参照)。
Next, the signal reproduced from the tape 46 by the reproduction head 47.48 is introduced into an RF equalizer 51.52 via a reproduction amplifier 49.50, where it is equalized by RF times suitable for demodulation. Further, demodulation is performed by FM demodulators 53 and 54 to obtain demodulated signals Ysb' and Csb' (Fig. 2(B)
, (C)).

信号YSb’  、csb’ は分配器55.56を介
して映像信号系統(V)および副搬送波再現系統(SC
)に分配する。
The signals YSb' and csb' are passed through distributors 55 and 56 to a video signal system (V) and a subcarrier reproduction system (SC).
).

副搬送波再現系統では、信号Ysb’ 、Csb’ か
らバースト抜取回路57.58によりバースト信号Bを
抜き取り、このバースト信号Bに同期した3、58MH
zの連続波SCを電圧制御発振器(VCO)59.60
で生成する。VCO59の出力は456穆相回路61を
介して同期検波器62に導くことによって、再生Y信号
の低域成分YL (0〜3M)Iz)および変換高域成
分YH’(0〜3MIIz)を取り出す。後者の変換高
域成分YH′ は周波数シフト回路64に導入され、3
〜6MHzの周波数スペクトラムにシフトされる。そし
て、前者の低域成分YLとともに加算回路65に加えら
れ、連続した周波数スペクトラム(0〜6 Ml(z)
の再生Y信号が形成される。
In the subcarrier reproduction system, the burst signal B is extracted from the signals Ysb' and Csb' by burst extraction circuits 57 and 58, and the 3.58 MHz signal is synchronized with this burst signal B.
z continuous wave SC with voltage controlled oscillator (VCO) 59.60
Generate with . The output of the VCO 59 is led to a synchronous detector 62 via a 456 phase circuit 61 to extract the low-frequency component YL (0 to 3M) Iz) and converted high-frequency component YH' (0 to 3MIIz) of the reproduced Y signal. . The latter converted high frequency component YH' is introduced into the frequency shift circuit 64 and
~6MHz frequency spectrum. Then, it is added to the adder circuit 65 together with the former low frequency component YL, and the continuous frequency spectrum (0 to 6 Ml(z)
A reproduced Y signal is formed.

再生信号Csb’ およびVCO60の出力は別個の同
期検波器63に導入され、周波数スペクトラム0〜3 
MHzのCW、  CN信号が出力される。そして、上
述したY信号とともにマトリックス回路66に人力され
、帯域幅6 MHzの再生R,G、B信号が得られる。
The reproduced signal Csb' and the output of the VCO 60 are introduced into a separate synchronous detector 63, which divides the frequency spectrum 0 to 3.
MHz CW and CN signals are output. Then, along with the Y signal described above, the signal is inputted to the matrix circuit 66 to obtain reproduced R, G, and B signals with a bandwidth of 6 MHz.

また、Ysb’信号を同期分離回路67に導入し、RG
Bカラーモニタの外部同期入力端子に供給するための再
生水平駆動パルスHDおよび再生垂直駆動パルスVDを
得る。
Further, the Ysb' signal is introduced into the synchronous separation circuit 67, and the RG
A reproduction horizontal drive pulse HD and a reproduction vertical drive pulse VD are obtained to be supplied to the external synchronization input terminal of the B color monitor.

上述の説明において、変調輝度信号Y′および変調色信
号C′ における副搬送波の位相を45°シフトしたの
は、次の理由による。すなわち、テープ上には信号Y′
およびC′が並んで記録されるので、再生の際にヘッド
走査のトラッキング誤差により信号Y用のヘッド47で
テープ上の信号Cのトラックの一部を再生し、他方、信
号C用のヘッド48でテープ上の信号Yのトラックの一
部を再生することがある。そこで、これら不要信号が同
期検波器62.83に人力されたときにも、検波出力と
して不要信号か抑圧されて出力されるよう考慮したため
である。
In the above explanation, the phase of the subcarrier in the modulated luminance signal Y' and the modulated color signal C' is shifted by 45° for the following reason. In other words, there is a signal Y′ on the tape.
and C' are recorded side by side, so during playback, the head 47 for signal Y plays back part of the track of signal C on the tape due to a tracking error in head scanning, while the head 47 for signal C plays back a part of the track of signal C on the tape. A part of the track of signal Y on the tape may be played back. Therefore, even when these unnecessary signals are manually input to the synchronous detectors 62 and 83, consideration has been given to ensuring that the unnecessary signals are suppressed and output as the detection output.

また、副搬送波を信号YL 、YH’  、Cw、 C
NIでそれぞれ直角二相変調する変調方式としては、両
側波帯変調、残留側波帯変調、単側波帯変調のいずれを
適用してもよい。
Also, subcarriers are used as signals YL, YH', Cw, C
Any of double sideband modulation, vestigial sideband modulation, and single sideband modulation may be applied as a modulation method for quadrature two-phase modulation with NI.

(発明の効果〕 従来家庭用VTRに通用されていた酸化物テープとフェ
ライトヘッドとの組み合わせから、メタルテープ、蒸着
テープ、 Baフェライトテープとメタルヘッドとの組
み合わせが用いられるようになり、最短記録波長が従来
に比して1/2に短縮されたが、本発明によれば、この
現象を記録・再生信号の帯域を拡大する方向に積極的に
適用することができる。
(Effects of the invention) The combination of oxide tape and ferrite head, which was conventionally used in home VTRs, has now been replaced by metal tape, vapor-deposited tape, and combinations of Ba ferrite tape and metal head, and the shortest recording wavelength has been improved. However, according to the present invention, this phenomenon can be positively applied to expand the band of recording/reproducing signals.

すなわち、本発明を実施することにより、従来と同じ相
対速度で記録・再生できる周波数帯域を、例えばY信号
については2倍、C信号については5倍にすることがで
きるので、従来よりはるかに解像度の高い映像信号を録
画・再生することか可能となる。
In other words, by implementing the present invention, the frequency band that can be recorded and reproduced at the same relative speed as before can be doubled for Y signals and 5 times for C signals, so the resolution is much higher than before. It becomes possible to record and play back high-quality video signals.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明を適用した簡易型VTRの映像信号系を
示すブロック図、 第2図(A)は第1図に示したVTRの記録信号周波数
配列を示す線図、 第2図(B)は第1図に示したVTRの記録信号を示す
波形図、 第2図(C)は、直角二相変調信号Y’  、C’  
とバースト信号Bどの位相関係を示す線図、 第3図は従来の簡易型VTRの映像信号系を示すブロッ
ク図、 第4図は第3図に示したVTRの記録信号周波数配列を
示す線図である。 1・・・ローパスフィルタ(LPF)、2・・・バンド
パスフィルタ(BPF)、3・・・Y/C分離回路、 4・・・FM変調器、 5・・・局部発振器、 6・・・周波数シフト回路、 7・・・加算器、 8・・・記録増幅器、 9・・・記録ヘッド、 10・・・テープ、 11・・・再生ヘッド、 12・・・再生増幅器、 13・・・バイパスフィルタ(HPF)、14・・・ロ
ーパスフィルタ(LPF)、15・・・FM復調器、 16・・・周波数シフト回路、 17・・・周波数変換器、 18・・・電圧制御発娠器(VCO)、19・・・位相
比較器、 20・・・局部発振器、 21・・・同期分離回路、 22・・・ローパスフィルタ、 23・・・バンドパスフィルタ、 24・・・加算器、 25・・・Y/C合成回路、 26・・・マトリクス回路、 27.28.29・・・ローパスフィルタ、30・・・
差動増幅器、 31・・・周波数シフト回路、 32.33・・・直角二相変調器、 34・・・水晶発振器、 35・・・45°移相器、 36・・・バースト形成回路、 37・・・同期信号発生器、 38.39・・・混合回路、 40.41 ・・・F精麦調器、 42.43・・・記録増幅器、 44.45・・・記録ヘッド、 46・・・テープ、 47.48・・・再生ヘッド、 49.50・・・再生増幅器、 51.52・・・RF等化器、 53.54・・・FM復調器、 55.56・・・分配器、 57.58・・・バースト抜取回路、 59.60 ・・・電圧制御発振器(VCO)、61・
・・45°移相回路、 62.63・・・同期検波器、 64・・・周波数シフト回路、 65・・・加算回路、 66・・・マトリクス回路、 67・・・同期分離回路。
FIG. 1 is a block diagram showing the video signal system of a simple VTR to which the present invention is applied, FIG. 2 (A) is a diagram showing the recording signal frequency arrangement of the VTR shown in FIG. 1, and FIG. ) is a waveform diagram showing the recording signal of the VTR shown in FIG. 1, and FIG.
Figure 3 is a block diagram showing the video signal system of a conventional simple VTR; Figure 4 is a diagram showing the recording signal frequency arrangement of the VTR shown in Figure 3. It is. 1...Low pass filter (LPF), 2...Band pass filter (BPF), 3...Y/C separation circuit, 4...FM modulator, 5...Local oscillator, 6... Frequency shift circuit, 7... Adder, 8... Recording amplifier, 9... Recording head, 10... Tape, 11... Playback head, 12... Playback amplifier, 13... Bypass Filter (HPF), 14...Low pass filter (LPF), 15...FM demodulator, 16...Frequency shift circuit, 17...Frequency converter, 18...Voltage controlled generator (VCO) ), 19... Phase comparator, 20... Local oscillator, 21... Synchronization separation circuit, 22... Low pass filter, 23... Band pass filter, 24... Adder, 25...・Y/C synthesis circuit, 26... Matrix circuit, 27.28.29... Low pass filter, 30...
Differential amplifier, 31... Frequency shift circuit, 32.33... Quadrature two-phase modulator, 34... Crystal oscillator, 35... 45° phase shifter, 36... Burst forming circuit, 37 ...Synchronizing signal generator, 38.39...Mixing circuit, 40.41...F wheat adjuster, 42.43...Recording amplifier, 44.45...Recording head, 46... tape, 47.48... reproducing head, 49.50... reproducing amplifier, 51.52... RF equalizer, 53.54... FM demodulator, 55.56... distributor, 57.58... Burst extraction circuit, 59.60... Voltage controlled oscillator (VCO), 61.
...45° phase shift circuit, 62.63... Synchronous detector, 64... Frequency shift circuit, 65... Addition circuit, 66... Matrix circuit, 67... Synchronous separation circuit.

Claims (1)

【特許請求の範囲】[Claims] 1)録画時においては、広帯域輝度信号を低域成分およ
び高域成分に分離し、前記高域成分を低域変換し、これ
ら両低域信号を副搬送波で直角2相変調すると共に、広
帯域および狭帯域の両色信号を45°移相した前記副搬
送波で直角2相変調し、バースト状の副搬送波とともに
これら輝度信号成分および色信号成分をFM変調記録し
、再生時においては、FM復調後に連続再生した副搬送
波で同期検波し、原信号を復元するようにしたことを特
徴とする磁気録画方式。
1) During recording, a wideband luminance signal is separated into a low frequency component and a high frequency component, the high frequency component is converted to a low frequency range, and both of these low frequency signals are quadrature two-phase modulated with a subcarrier. The narrowband bichromatic signal is quadrature-two-phase modulated using the subcarrier with a 45° phase shift, and the luminance signal component and color signal component are FM-modulated and recorded along with the burst-like subcarrier, and during playback, after FM demodulation. A magnetic recording method characterized by synchronous detection using continuously reproduced subcarriers to restore the original signal.
JP61018878A 1986-01-30 1986-01-30 Magnetic picture recording system Pending JPS62176393A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61018878A JPS62176393A (en) 1986-01-30 1986-01-30 Magnetic picture recording system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61018878A JPS62176393A (en) 1986-01-30 1986-01-30 Magnetic picture recording system

Publications (1)

Publication Number Publication Date
JPS62176393A true JPS62176393A (en) 1987-08-03

Family

ID=11983808

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61018878A Pending JPS62176393A (en) 1986-01-30 1986-01-30 Magnetic picture recording system

Country Status (1)

Country Link
JP (1) JPS62176393A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009061226A (en) * 2007-09-10 2009-03-26 Tokyo Electric Power Co Inc:The Fire door

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009061226A (en) * 2007-09-10 2009-03-26 Tokyo Electric Power Co Inc:The Fire door

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