JPH0748242B2 - Magnetic recording / reproducing device - Google Patents

Magnetic recording / reproducing device

Info

Publication number
JPH0748242B2
JPH0748242B2 JP1279489A JP1279489A JPH0748242B2 JP H0748242 B2 JPH0748242 B2 JP H0748242B2 JP 1279489 A JP1279489 A JP 1279489A JP 1279489 A JP1279489 A JP 1279489A JP H0748242 B2 JPH0748242 B2 JP H0748242B2
Authority
JP
Japan
Prior art keywords
recording
circuit
signal
magnetic tape
reproduction
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.)
Expired - Fee Related
Application number
JP1279489A
Other languages
Japanese (ja)
Other versions
JPH02192001A (en
Inventor
健一 平田
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1279489A priority Critical patent/JPH0748242B2/en
Publication of JPH02192001A publication Critical patent/JPH02192001A/en
Publication of JPH0748242B2 publication Critical patent/JPH0748242B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、例えばHiFiオーディオ信号をテープの深層
部分に、映像信号を表層部分に記録する多層記録方式の
磁気記録再生装置(以下、「VTR」という)に関し、詳
しくはそれぞれの記録条件を最適に自動制御する方式に
関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a magnetic recording / reproducing apparatus of a multi-layer recording system (hereinafter, referred to as "VTR", for recording a HiFi audio signal in a deep layer portion of a tape and a video signal in a surface layer portion, for example. In detail, it relates to a method for automatically controlling each recording condition optimally.

[従来の技術] 第4図はVHS−HiFi方式のブロック回路図であり、回転
ドラム上にオーデイオ用ヘッドを配置し、オーデイオ信
号をFM変調して磁気テープに厚み方向(垂直方向)の深
層記録するものである。
[Prior Art] FIG. 4 is a block circuit diagram of the VHS-HiFi system, in which an audio head is arranged on a rotating drum, and the audio signal is FM-modulated to perform deep recording in the thickness direction (vertical direction) on a magnetic tape. To do.

図において、(1)はオーデイオ信号入力端子、(2)
はプリエンフアシス回路、(3)ノイズリダクシヨン回
路、(4)はFM変調回路、(5)は記録増幅器で、
(2)〜(5)でオーデイオ信号記録回路(60)を構成
している。
In the figure, (1) is an audio signal input terminal, (2)
Is a pre-emphasis circuit, (3) is a noise reduction circuit, (4) is an FM modulation circuit, and (5) is a recording amplifier.
The audio signal recording circuit (60) is composed of (2) to (5).

(21)はビデオ信号入力端子、(22)はプリエンフアシ
ス回路、(23)はホワイトクリツプ・ダーククリツプ回
路、(24)はFM変調回路、(25)は記録増幅器で、(2
2)〜(25)でビデオ信号記録回路(80)を構成してい
る。
(21) is a video signal input terminal, (22) is a pre-emphasis circuit, (23) is a white clip / dark clip circuit, (24) is an FM modulation circuit, (25) is a recording amplifier, and (2)
2) to (25) form a video signal recording circuit (80).

また、(6),(17),(26),(27)は録画、再生で
切換わるスイツチ、(10),(20)は回転トランス、
(40)は回転ドラム、(41),(42)はオーデイオヘツ
ド、(43),(44)はビデオヘツド、(50)は磁気テー
プである。
In addition, (6), (17), (26) and (27) are switches that switch between recording and playback, (10) and (20) are rotary transformers,
(40) is a rotary drum, (41) and (42) are audio heads, (43) and (44) are video heads, and (50) is a magnetic tape.

また、(15),(16)はオーデイオ用の再生プリアン
プ、(14)はチヤンネルスイツチ回路、(13)はAGC回
路、(12)は復調回路、(11)は復調出力端子で、(1
2)〜(16)でオーデイオ信号再生回路(70)を構成し
ている。
Also, (15) and (16) are reproduction preamplifiers for audio, (14) is a channel switch circuit, (13) is an AGC circuit, (12) is a demodulation circuit, and (11) is a demodulation output terminal.
2) to (16) constitute an audio signal reproduction circuit (70).

また、(35),(36)はビデオ用の再生プリアンプ、
(34)はチヤンネルスイツチ回路、(33)はAGC回路、
(32)は復調回路、(31)は復調出力端子で、(32)〜
(36)でビデオ信号再生回路(90)を構成している。
Also, (35) and (36) are playback preamplifiers for video,
(34) is a channel switch circuit, (33) is an AGC circuit,
(32) is a demodulation circuit, (31) is a demodulation output terminal,
(36) constitutes a video signal reproducing circuit (90).

つぎに動作について説明する。オーデイオ信号はRチヤ
ンネル,Lチヤンネルの2チヤンネルあるが、ここでは説
明を簡単にするために1チヤンネルのみ考える。入力端
子(1)から入力されたオーデイオ信号は、プリエンフ
アシス回路(2)、ノイズリダクシヨン回路(3)の処
理を経てFM変調回路(4)にてFM変調される(Rチヤン
ネル1.3MHz、Lチヤネル1.7MHz)。この変調されたオー
デイオ信号は、記録増幅器(5)にて電流増幅され、ス
イツチ(6)を経て回転トランス(10)へ供給され、オ
ーデイオヘツド(41),(42)で磁気テープ(50)の深
層部に記録される。
Next, the operation will be described. There are 2 channels of R channel and L channel, but here, only 1 channel is considered to simplify the explanation. The audio signal input from the input terminal (1) is processed by the pre-emphasis circuit (2) and the noise reduction circuit (3) and then FM-modulated by the FM modulation circuit (4) (R channel 1.3 MHz, L channel). 1.7MHz). The modulated audio signal is current-amplified by the recording amplifier (5), supplied to the rotary transformer (10) via the switch (6), and is transferred to the magnetic tape (50) by the audio heads (41) and (42). It is recorded in the deep part.

一方、入力端子(21)に入力されたオーデイオ信号は、
プリエンフアシス回路(22)、ホワイトクリツプ・ダー
ククリツプ回路(23)の処理を経てFM変調回路(24)に
てFM変調される(VHS方式;同期信号−3.4MHz、白信号
−4.4MHz)。FM信号は記録増幅器(25)、スイツチ(2
6)を経て回転トランス(30)に供給され、ビデオヘツ
ド(43),(44)で磁気テープ(50)の表面部に記録さ
れる。
On the other hand, the audio signal input to the input terminal (21) is
After being processed by the pre-emphasis circuit (22) and the white clip / dark clip circuit (23), it is FM-modulated by the FM modulation circuit (24) (VHS system; synchronization signal -3.4 MHz, white signal -4.4 MHz). FM signal is recorded amplifier (25), switch (2
It is supplied to the rotary transformer (30) via 6) and recorded on the surface of the magnetic tape (50) by the video heads (43) and (44).

つぎに再生モードを考える。磁気テープ(50)に記録さ
れたオーデイオ信号は、オーデイオヘツド(41),(4
2)にて取り出され、回転トランス(10)、スイツチ
(6),(17)を経て再生プリアンプ(15),(16)に
て増幅された後、チヤンネルスイツチ回路(14)にて連
続した再生FM信号に復元される。さらに、AGC回路(1
3)を経てFM復調回路(12)にて復調され、復調出力が
出力端子(11)から出力される。
Next, consider the playback mode. The audio signal recorded on the magnetic tape (50) is transferred to the audio head (41), (4
Taken out in 2), passed through rotary transformer (10), switches (6), (17), amplified in preamplifiers (15), (16), and then continuously reproduced in channel switch circuit (14). Restored to FM signal. In addition, the AGC circuit (1
After 3), it is demodulated by the FM demodulation circuit (12) and the demodulated output is output from the output terminal (11).

ビデオ信号の再生動作も、ビデオ信号再生回路(90)で
全く同様に行なわれるので、詳細な説明は省略する。
Since the video signal reproducing operation is performed in the video signal reproducing circuit (90) in exactly the same manner, detailed description thereof will be omitted.

このように、オーデイオ信号とビデオ信号とは磁気テー
プ(50)上で重ね書きされるが、両信号のクロストーク
はビデオヘツドは±6゜、オーデイオヘツドは±30゜と
いうアジマス角を設けて除去している。しかしながら、
オーデイオ信号の表層部は後から記録されるビデオ信号
により消去され、再生出力は約12dbも減磁されることに
なり、それぞれの記録レベルの管理を厳密に行なう必要
がある。図には示していないが、生産工程内で記録増幅
器(5),(25)のレベルを個々に調整管理している。
In this way, the audio signal and the video signal are overwritten on the magnetic tape (50), but the crosstalk between both signals is removed by providing an azimuth angle of ± 6 ° for the video head and ± 30 ° for the audio head. is doing. However,
The surface layer of the audio signal will be erased by the video signal recorded later, and the reproduction output will be demagnetized by about 12db, so it is necessary to strictly control each recording level. Although not shown in the figure, the levels of the recording amplifiers (5) and (25) are individually adjusted and controlled in the production process.

[発明が解決しようとする課題] 従来の磁気記録再生装置は以上のように構成され、オー
デイオヘツド,ビデオヘツドの記録再生感度、バラツキ
を含めて記録に際してある決められた値にそれぞれ調整
を行なう必要があつた。ヘツドのバラツキを考えれば、
個々のヘツドに応じて記録レベルを調整すれば良いが、
それには記録・再生時の確認を個々に行なう必要が生
じ、生産工程内では時間がかかりすぎる等の問題があり
実施されていないのが実情である。
[Problems to be Solved by the Invention] The conventional magnetic recording / reproducing apparatus is configured as described above, and it is necessary to adjust the recording / reproducing sensitivity of the audio head and the video head to a predetermined value for recording, including variations. I got it. Considering the variation of the head,
You can adjust the recording level according to each head,
For that purpose, it is necessary to individually confirm at the time of recording / reproducing, and there is a problem that it takes too much time in the production process, and the fact is that it is not implemented.

この発明は上記のような問題点を解消するためになされ
たもので、多層記録を行なう複数のヘツドの最適記録状
態を自動的に実現せしめる磁気記録再生装置を得ること
を目的とする。
The present invention has been made to solve the above problems, and an object of the present invention is to provide a magnetic recording / reproducing apparatus capable of automatically realizing an optimum recording state of a plurality of heads for performing multi-layer recording.

[課題を解決するための手段] この発明に係る磁気記録再生装置は、記録一時停止状態
においてある一定時間磁気テープの巻戻しを行ない、そ
の期間内、または一時停止解除後の位相合わせ再生期間
内を再生処理回路を動作モードにして再生された信号の
レベルを検出し、このレベルをA/D変換して演算処理を
行なうマイクロプロセツサーに入力して初期設定レベル
と比較演算して各ヘツドの記録、再生感度を補正して最
適の記録レベルにする補正出力を作成し、各記録増幅器
の利得を補正するように構成したものである。
[Means for Solving the Problems] A magnetic recording / reproducing apparatus according to the present invention rewinds a magnetic tape for a certain period of time in a recording suspended state, and within that period, or within a phase adjustment reproducing period after the suspension is released. The playback processing circuit is set to the operating mode, the level of the reproduced signal is detected, and this level is input to the microprocessor that performs A / D conversion and arithmetic processing, and is compared with the initial setting level to calculate each head. The recording and reproducing sensitivities are corrected to produce a correction output for obtaining the optimum recording level, and the gain of each recording amplifier is corrected.

[作 用] この発明における磁気記録再生装置は、記録一度停止モ
ード時に、記録された各信号のレベルを検出し、この検
出レベルが初期設定レベルとなるように各記録増幅器の
利得を制御する。
[Operation] The magnetic recording / reproducing apparatus of the present invention detects the level of each recorded signal in the recording once stop mode, and controls the gain of each recording amplifier so that the detected level becomes the initial setting level.

[発明の実施例] 以下、この発明の一実施例を図について説明する。第1
図において、第4図と同一部分には同一符号を付して説
明を省略する。
[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, the same parts as those in FIG.

(61)は再生FMオーデイオ信号をピーク検波する検波回
路、(63)は再生FMビデオ信号をピーク検波する検波回
路、(62),(64)はA/D変換器、(65)はマイクロプ
ロセツサ(以下、「CPU」という)で、(61)〜(65)
で演算利得制御回路(100)を構成しており、CPU(65)
はA/D変換器(62),(64)から入力される信号および
記録一時停止および記録開始のタイミングを決めるため
の制御信号(66),(67)を受けて、記録一時停止、記
録開始のタイミングに合わせて適当な時間スイツチ
(6),(17),(26),(37)を再生側に切換える制
御信号(70)を発生するとともに、再生信号レベルと初
期設定値との差を検出し、記録増幅器(5)および(2
5)の利得を制御する信号(68),(69)を演算して発
生させる。
(61) is a detection circuit for peak detection of the reproduction FM audio signal, (63) is detection circuit for peak detection of the reproduction FM video signal, (62) and (64) are A / D converters, and (65) is a micro processor. Set (61) to (65) on the processor (hereinafter referred to as "CPU")
Computational gain control circuit (100) is composed of and CPU (65)
Receives the signals input from the A / D converters (62) and (64) and the control signals (66) and (67) for determining the timings of recording pause and recording start, and recording pause and recording start The control signal (70) for switching the switches (6), (17), (26), (37) to the reproduction side at an appropriate time according to the timing of is generated, and the difference between the reproduction signal level and the initial setting value is set. Detect and record amplifiers (5) and (2
The signals (68) and (69) that control the gain of 5) are calculated and generated.

第2図はこの実施例の動作を説明するための図で、(5
1)は音声トラツク、(52)はビデオトラツク、(53)
はコントロールトラツク、(54)はコントロール信号で
ある。
FIG. 2 is a diagram for explaining the operation of this embodiment.
1) is audio track, (52) is video track, (53)
Is a control track, and (54) is a control signal.

つぎに動作について説明する。Next, the operation will be described.

第3図はこの実施例の動作を説明するためのタイミング
図である。
FIG. 3 is a timing chart for explaining the operation of this embodiment.

通常、記録一時停止時には、つなぎ録り時の画像の乱れ
等を除去するため、磁気テープ(50)を所定時間だけ巻
戻して停止状態となし、記録開始時には、巻戻した時間
の間に位相合わせ再生状態としてから録画を開始させる
位相合わせが行なわれている。第2図でさらに説明する
と、記録一時停止(REC PAUSE)が指令されると、磁気
テープ(50)は、コントロールパルス(記録時に1フレ
ーム毎にコントロールトラツクに記録される)33ケ分巻
戻されて一時停止状態となる(第3図(a)参照)。さ
らに、録画開始モードに移行すると、約1秒(30フレー
ム)間位相合わせ再生状態となり、前に記録されたコン
トロール信号と同期合わせを行なつたのち録画状態に切
換わる。制御信号(66)(第3図(b)参照)はREC PA
USE時に切換わる信号であり、制御信号(67)はREC開始
後位相合わせ再生終了時点で切換わる信号である。切換
制御パルス(70)は上記2つの制御信号(66),(67)
より発生される制御信号である。CPU(65)に入力され
る制御信号(66),(67)より切換制御パルス(70)が
発生すると、各スイツチ(6),(17),(26),(3
7)が再生側に切換わると同時に再生回路(70),(9
0)も再生状態となり、位相合わせ再生期間の間、それ
ぞれの再生信号は検波回路(61),(63)で検波され、
A/D変換器(62),(64)を通してCPU(65)へ入力させ
る。CPU(65)は初期設定レベルと比較演算を行ない、
その差出力により記録増幅器(5),(25)の利得を決
定する利得制御信号(68),(69)を出力する。記録増
幅器(5),(25)は、それぞれ利得制御信号(68),
(69)により利得が制御されて最適な記録条件となり、
磁気テープ(50)への記録が開始される。
Normally, when recording is paused, the magnetic tape (50) is rewound for a specified period of time to stop it in order to eliminate image distortion during splicing and recording. Phase matching is performed so that recording is started after the matched reproduction state. To further explain with reference to FIG. 2, when a recording pause (REC PAUSE) is instructed, the magnetic tape (50) is rewound by 33 control pulses (recorded in the control track every frame at the time of recording). Is temporarily stopped (see FIG. 3 (a)). Further, when the mode is shifted to the recording start mode, the phase-matching reproduction state is maintained for about 1 second (30 frames), and after synchronizing with the previously recorded control signal, the mode is switched to the recording state. The control signal (66) (see Fig. 3 (b)) is REC PA.
The signal is switched at the time of USE, and the control signal (67) is a signal switched at the time of ending the phase matching reproduction after the start of REC. The switching control pulse (70) is the above two control signals (66), (67).
Is a control signal generated by When the switching control pulse (70) is generated from the control signals (66) and (67) input to the CPU (65), the respective switches (6), (17), (26), (3)
At the same time that 7) switches to the playback side, playback circuits (70), (9
0) also becomes a reproduction state, and during the phase matching reproduction period, each reproduction signal is detected by the detection circuits (61) and (63),
Input to CPU (65) through A / D converters (62) and (64). The CPU (65) performs a comparison operation with the default level,
Gain control signals (68) and (69) for determining the gains of the recording amplifiers (5) and (25) are output based on the difference output. The recording amplifiers (5) and (25) have gain control signals (68) and (25), respectively.
The gain is controlled by (69) and the optimum recording condition is obtained.
Recording on the magnetic tape (50) starts.

なお、上記実施例では、オーデイオ信号はR,Lチヤンネ
ルを区別せずに説明したが、各チヤンネル毎に位相組合
わせ再生期間中に各チヤンネルの再生信号のレベルを検
出し、各チヤンネル毎に記録レベルを調整するようにし
てもよい。
In the above embodiment, the audio signal is explained without distinguishing between R and L channels, but the level of the reproduced signal of each channel is detected during the phase combination reproduction period for each channel and recorded for each channel. The level may be adjusted.

また、上記実施例では、磁気テープにHiFiオーデイオ信
号とビデオ信号とを2層記録する例を示したが、PCMオ
ーデイオ信号を含めた3層記録にも同様に適用でき、こ
の場合の記録レベルのバランスは非常にクリテイカルと
なるので、特に大きな効果が得られる。
Further, in the above-described embodiment, an example in which the HiFi audio signal and the video signal are recorded on the magnetic tape in two layers is shown, but the invention can be similarly applied to the three layer recording including the PCM audio signal. The balance is so critical that it can be very effective.

[発明の効果] 以上のように、この発明によれば記録一時停止後の記録
開始時の一定時間内に、記録された各ヘツドの再生信号
のレベルを検出し初期値との差を比較演算し、その出力
により自動的に各ヘツド記録レベルを最適値に補正する
ように構成したので、生産工程内の工数が増えずに最適
な性能が無調整で実現できる磁気記録再生装置が得られ
る効果がある。
[Effects of the Invention] As described above, according to the present invention, the level of the reproduced signal of each recorded head is detected within a certain time at the start of recording after the recording is paused, and the difference from the initial value is compared and calculated. However, since the output is automatically corrected to each head recording level to the optimum value, it is possible to obtain a magnetic recording / reproducing apparatus that can realize optimum performance without adjustment without increasing man-hours in the production process. There is.

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

第1図はこの発明の一実施例のブロツク回路図、第2図
はこの実施例の動作を説明するための磁気テープの走行
パターンを示す図、第3図はこの実施例の記録一時停止
時のタイミング図、第4図は従来の磁気記録再生装置の
構成を示すブロツク回路図である。 (6),(17),(26),(37)……スイツチ、(50)
……磁気テープ、(60)……オーデイオ信号記録回路、
(70)……オーデイオ信号再生回路、(80)……ビデオ
信号機録回路、(90)……ビデオ信号再生回路、(10
0)……演算利得制御回路。 なお、各図中、同一符号は同一、または相当部分を示
す。
FIG. 1 is a block circuit diagram of an embodiment of the present invention, FIG. 2 is a diagram showing a running pattern of a magnetic tape for explaining the operation of this embodiment, and FIG. 3 is a recording pause of this embodiment. FIG. 4 is a block circuit diagram showing the structure of a conventional magnetic recording / reproducing apparatus. (6), (17), (26), (37) ... Switch, (50)
...... Magnetic tape, (60) …… Audio signal recording circuit,
(70) …… Audio signal reproduction circuit, (80) …… Video signal recording circuit, (90) …… Video signal reproduction circuit, (10
0) ... Computation gain control circuit. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】磁気テープ上の垂直方向に多層記録を行な
うヘリカルスキヤン方式の磁気記録再生装置であつて、
記録一時停止時にある一定時間磁気テープを巻戻し状態
とする手段と、その巻戻し期間内もしくは一時停止解除
後の位相組合わせ期間内に再生モードに切換え、多層記
録されたそれぞれの信号レベルを検出して初期設定値と
の差を演算する手段と、記録モードに切換わつた時点で
この演算出力により多層記録を行なうそれぞれの記録増
幅器の利得を制御して記録電流を補正する手段とを備え
た磁気記録再生装置。
1. A helical scan type magnetic recording / reproducing apparatus for performing multi-layer recording in a perpendicular direction on a magnetic tape, comprising:
Means to put the magnetic tape in the rewind state for a certain period of time when recording is paused, and switch to the replay mode during the rewinding period or within the phase combination period after releasing the pause, and detect the respective signal levels recorded in multiple layers. And means for calculating the difference from the initial set value and means for correcting the recording current by controlling the gain of each recording amplifier for performing multi-layer recording by this arithmetic output when the recording mode is switched. Magnetic recording / reproducing device.
JP1279489A 1989-01-19 1989-01-19 Magnetic recording / reproducing device Expired - Fee Related JPH0748242B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1279489A JPH0748242B2 (en) 1989-01-19 1989-01-19 Magnetic recording / reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1279489A JPH0748242B2 (en) 1989-01-19 1989-01-19 Magnetic recording / reproducing device

Publications (2)

Publication Number Publication Date
JPH02192001A JPH02192001A (en) 1990-07-27
JPH0748242B2 true JPH0748242B2 (en) 1995-05-24

Family

ID=11815303

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1279489A Expired - Fee Related JPH0748242B2 (en) 1989-01-19 1989-01-19 Magnetic recording / reproducing device

Country Status (1)

Country Link
JP (1) JPH0748242B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3148814B2 (en) * 1990-02-06 2001-03-26 株式会社日立製作所 Magnetic recording / reproducing device

Also Published As

Publication number Publication date
JPH02192001A (en) 1990-07-27

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