JPH0363969A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPH0363969A JPH0363969A JP1201946A JP20194689A JPH0363969A JP H0363969 A JPH0363969 A JP H0363969A JP 1201946 A JP1201946 A JP 1201946A JP 20194689 A JP20194689 A JP 20194689A JP H0363969 A JPH0363969 A JP H0363969A
- Authority
- JP
- Japan
- Prior art keywords
- frequency modulator
- signal
- frequency
- video signal
- output
- 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
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
Landscapes
- Television Signal Processing For Recording (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明ば、ＶＴＲなどに用いることができる磁気記録再
生装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a magnetic recording and reproducing device that can be used in VTRs and the like.
従来の技術
第２図は、従来の磁気記録再生装置のブロック図を示す
ものである。第２図にかいて、１は映像信号入力端子で
ある。２は周波数変調器、３は記録増幅器、４は基準発
振器である。ちと９は切り換えスイッチである。６は記
録ヘッド、７は再生ヘッドである。８は前置増幅器、１
０は復調器、１１は映像信号出力端子である。BACKGROUND OF THE INVENTION FIG. 2 shows a block diagram of a conventional magnetic recording/reproducing apparatus. In FIG. 2, 1 is a video signal input terminal. 2 is a frequency modulator, 3 is a recording amplifier, and 4 is a reference oscillator. Chito 9 is a changeover switch. 6 is a recording head, and 7 is a reproducing head. 8 is a preamplifier, 1
0 is a demodulator, and 11 is a video signal output terminal.
以上のように構成された磁気記録再生装置について、以
下その動作について説明する。The operation of the magnetic recording/reproducing apparatus configured as described above will be described below.
１ず、映像信号入力端子１から入力された映像信号は、
周波数変調器で周波数変調される。その周波数変調され
た信号は記録増幅器３で増幅され、記録ヘッド６によっ
て磁気テープ１２に記録される。再生時には、磁気テー
プ１２に記録された信号を再生ヘッド７で再生し、前置
増幅器８によって増幅される。再生時には切り換えスイ
ッチ９はａ側に閉じて訃り、そのスイッチを通り復調器
１ｏによって元の映像信号に復調され、映像信号出力端
子１１に出力される。なか、以上に示した磁気テープ１
２金介した信号の流れ金板下にＶ−Ｖ系と述べる。1. The video signal input from the video signal input terminal 1 is
The frequency is modulated by a frequency modulator. The frequency-modulated signal is amplified by a recording amplifier 3 and recorded on a magnetic tape 12 by a recording head 6. During reproduction, the signal recorded on the magnetic tape 12 is reproduced by the reproduction head 7 and amplified by the preamplifier 8. During playback, the selector switch 9 is closed to side a, and the signal passes through the switch and is demodulated to the original video signal by the demodulator 1o, which is output to the video signal output terminal 11. Among them, the magnetic tape 1 shown above
The flow of signals through two metals is described as a V-V system below the metal plate.
Ｖ−Ｖ系の信号の流れに対し、切り換えスイッチ６がａ
側、切り換えスイッチ９がｂ側に閉じている状態の信号
の流れ１Ｘ−１系という。この場合には映像信号入力端
子１から入力された映像信号音周波数変調器２で周波数
変調し、切り換えスイッチ５、切り換えスイッチ９を通
り、復調器１０で復調し、映像信号出力端子１１に出力
される。Ｅ−Ｅ系では映像信号は磁気ヘッドや磁気テー
プ金通らない系となっている。For the V-V system signal flow, the selector switch 6 is
side, the signal flow in the state where the changeover switch 9 is closed to the b side is called the 1X-1 system. In this case, the video signal input from the video signal input terminal 1 is frequency-modulated by the sound frequency modulator 2, passes through the changeover switch 5 and changeover switch 9, is demodulated by the demodulator 10, and is output to the video signal output terminal 11. Ru. In the E-E system, the video signal does not pass through magnetic heads or magnetic tapes.
第２図に督いて、周波数変調器２は入力された映像信号
のレベルに応じた周波敷金発生する。すなわち電圧−周
波数変換器である。Ｖ’ｒＲなどの磁気記録再生装置で
は、池の機器との互換金床つ意味から入力映像信号レベ
ルに対する変調周波数の割り当てが正確に規定されてか
り、第２図の周波数変調器２はその規定されている値を
満足するように調整する必要がある。そこで第２図の基
準発振器４であらかじめ映像信号の基準レベルに相当す
る周波数を発生するようにしてかき、切り換えスイッチ
５を周期的に切り換えることによってｂ側に閉じた切り
換えスイッチ９、復調器１０金通り、映像信号出力端子
１１で入力信号と基準発振器４の発振周波数に相当する
レベルが観測できる。したがって、この映像信号出力端
子１１の出力を観測し、基準発振器４の発信周波数に相
当する映像レベルと基準発振器４によるレベルが同じに
なるように周波数変調器２の調整を行うことができる。As shown in FIG. 2, the frequency modulator 2 generates a frequency deposit according to the level of the input video signal. That is, it is a voltage-frequency converter. In magnetic recording and reproducing devices such as V'rR, the assignment of modulation frequencies to input video signal levels is precisely specified for compatibility with Ike's equipment, and the frequency modulator 2 shown in Fig. 2 conforms to this specification. It is necessary to adjust the value to satisfy the given value. Therefore, the reference oscillator 4 shown in FIG. As shown, a level corresponding to the input signal and the oscillation frequency of the reference oscillator 4 can be observed at the video signal output terminal 11. Therefore, by observing the output of the video signal output terminal 11, it is possible to adjust the frequency modulator 2 so that the video level corresponding to the oscillation frequency of the reference oscillator 4 and the level generated by the reference oscillator 4 are the same.
発明が解決しようとする課題
しかしながら、上記の従来の構成では、変調器の調整の
ために最低２種類の周波敷金発生する基準発振器金持た
なければならず、しかもその基準発振器は周波数精度も
要求されるため、一般的には水晶発振器が用いられ、高
価であるという欠点余有していた。また、この基準発振
器は磁気記録再生装置の通常の記録再生などの使用では
不要なものであるが、変調器の調整のためには必要であ
るため、回路的に用意しなければならないという欠点を
有していた。Problems to be Solved by the Invention However, in the above conventional configuration, it is necessary to have a reference oscillator that generates at least two types of frequency deposits in order to adjust the modulator, and the reference oscillator also requires frequency accuracy. Therefore, a crystal oscillator is generally used, which has the drawback of being expensive. In addition, although this reference oscillator is not necessary for normal recording and reproduction of the magnetic recording and reproducing device, it is necessary for adjusting the modulator, so it has the disadvantage of having to be prepared in the circuit. had.
本発明は、上記従来の課題上解決するもので、回路的に
基準発振器を持たずに容易に変調器の調整が行える磁気
記録再生装置を提供することを目的とする。The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a magnetic recording/reproducing device in which a modulator can be easily adjusted without having a reference oscillator in terms of circuitry.
課題を解決するための手段
本発明は、映像信号上周波数変調する周波数変調器と、
該周波数変調器の出力を記録増幅器を介して磁気テープ
に記録する記録ヘッドと、前記磁気テープよシ信号金読
み出す再生ヘッドと、前記再生ヘッドの増幅出力金復調
する復調器と金右する磁気記録再生装置にかいて基準と
なる磁気媒体の再生時に基準の映像信号を入力したとき
の前記周波数変調器より得られる信号及び再生ヘッドよ
シ得られる信号を前記復調器により復調した信号レベル
が同一になるように前記周波数変調器を調整するべく、
前記変調器の出力及び前記再生ヘッドの出力を周期的に
切り換える切換回路を設けたことを特徴とするものであ
る。Means for Solving the Problems The present invention provides a frequency modulator that performs frequency modulation on a video signal;
a recording head for recording the output of the frequency modulator on a magnetic tape via a recording amplifier; a reproducing head for reading out a signal from the magnetic tape; a demodulator for demodulating the amplified output of the reproducing head; When a reference video signal is input to the playback device during playback of a reference magnetic medium, the signal level obtained by demodulating the signal obtained from the frequency modulator and the signal obtained from the playback head by the demodulator is the same. In order to adjust the frequency modulator so that
The apparatus is characterized in that a switching circuit is provided for periodically switching the output of the modulator and the output of the reproducing head.
作用
この構成によって、入力映像信号を周波数変調した信号
とあらかじめ規定された周波数割当で記録された磁気媒
体を再生した信号を切り換えて周波数変調器、復調器よ
り得られる信号が同一レベルとなるように周波数変調器
の調整を行うことができる。もって、別途、基準発振器
を回路的に準備する必要はない。Effect: With this configuration, the signals obtained from the frequency modulator and demodulator are switched between a signal obtained by frequency modulating the input video signal and a signal obtained by reproducing a magnetic medium recorded with a predefined frequency allocation, so that the signals obtained from the frequency modulator and demodulator have the same level. Frequency modulator adjustments can be made. Therefore, there is no need to prepare a separate reference oscillator circuit.
実施例
以下本発明の一実施例について、図面金参照しながら説
明する。EXAMPLE An example of the present invention will be described below with reference to the drawings.
第１図は本発明の実施例に釦ける磁気記録再生装置のブ
ロック図金示すものである。第１図に３いて、１は映像
信号入力端子、２は周波数変調器、３は記録増幅器であ
る。６は記録ヘッド、７は再生ヘッド、８は前置増幅器
、９は切り換えスイッチである。１０は復調器、１１は
映像信号出力端子、１２は磁気テープである。FIG. 1 shows a block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 3 denotes a video signal input terminal, 2 a frequency modulator, and 3 a recording amplifier. 6 is a recording head, 7 is a reproducing head, 8 is a preamplifier, and 9 is a changeover switch. 10 is a demodulator, 11 is a video signal output terminal, and 12 is a magnetic tape.
以上のように構成された磁気記録再生装置について、以
下その動作を説明する。The operation of the magnetic recording/reproducing apparatus configured as described above will be described below.
通常の記録再生での信号の流れは、従来例と同様である
から説明金省略する。本実施例において周波数変調器２
の調整時には、あらかじめ規定された周波数側シ当てで
記録された基準となる磁気テープ１２を再生ヘッド７で
再生し、前置増幅器８で増幅した信号と映像入力端子１
より入力された基準となる映像信号上周波数変調器２で
周波数変調した信号を切り換えスイッチ９で周期的に切
り換える。そして切り換えスイッチ９の出力を復調器１
０で復調し、映像信号出力端子１１を観測して切り換え
の前後で出力が同一となるように調整する。すなわち、
映像信号出力端子１１を観測し、基準となる磁気テープ
１２からの信号に対し入力信号からのに−に系の信号レ
ベ／′Ｉ／ヲ周波数変調器２で調整することによって周
波数変調器の調整が可能である。The flow of signals during normal recording and reproduction is the same as in the conventional example, so explanation will be omitted. In this embodiment, the frequency modulator 2
During adjustment, a reference magnetic tape 12 recorded at a predefined frequency side is played back by the playback head 7, and the signal amplified by the preamplifier 8 and the video input terminal 1 are played back by the playback head 7.
A signal that is frequency-modulated by a frequency modulator 2 on a video signal that is input as a reference is periodically switched by a changeover switch 9. Then, the output of the changeover switch 9 is sent to the demodulator 1.
0, monitor the video signal output terminal 11, and adjust so that the output is the same before and after switching. That is,
The frequency modulator is adjusted by observing the video signal output terminal 11 and adjusting the signal level of the input signal with the frequency modulator 2 relative to the signal from the reference magnetic tape 12. is possible.
なか、第１図に訃いて切り換えスイッチ９ば、調整以外
の通常の状態では、ａ側でＶ−Ｖ系、ｂ側でに−ＩＣ系
を切り換えるものであるが、周波数変調器の調整時には
、ａ側とｂ側合交互に切り換える動作をする。Among them, the changeover switch 9 shown in Fig. 1 is used to switch the V-V system on the a side and the -IC system on the b side in normal conditions other than adjustment, but when adjusting the frequency modulator, The operation is performed to alternately switch between the a side and the b side.
以上のように本実施例によれば、入力信号と基準となる
磁気テープからの信号を周期的に切り換えるスイソチ金
設けることにより、基準発振器を持たずして周波数変調
器の調整を行うことができる。As described above, according to this embodiment, by providing a switch that periodically switches the input signal and the signal from the reference magnetic tape, it is possible to adjust the frequency modulator without having a reference oscillator. .
発明の効果
以上のように本発明は、周波数変調器と磁気媒体とそれ
らからの信号を周期的に切り換えるスイッチを設けるこ
とにより、基準発振器を持たずして、周波数変調器の調
整金行うことができる優れた磁気記録再生袋＠金実現で
きるものである。Effects of the Invention As described above, the present invention provides a frequency modulator, a magnetic medium, and a switch that periodically switches the signals from them, thereby making it possible to adjust the frequency modulator without having a reference oscillator. An excellent magnetic recording and reproducing bag @gold can be realized.
第１図は本発明の一実施例に訃ける磁気記録再生装置の
ブロック図、第２図は従来の磁気記録再生装置のブロッ
ク図である。
１・・・・・・映像入力端子、２・・・・・周波数変調
器、３・・・・・・記録増幅器、６・・・・・・記録ヘ
ッド、７・・・・・再生ヘッド、８・・・・・前置増幅
器、９・・・・・・切り換えスイッチ、１０・・・・・
・復調器、１１・・・・・・映像信号出力端子、１２・
−・・・・磁気テープ。FIG. 1 is a block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional magnetic recording/reproducing apparatus. 1... Video input terminal, 2... Frequency modulator, 3... Recording amplifier, 6... Recording head, 7... Playback head, 8... Preamplifier, 9... Changeover switch, 10...
・Demodulator, 11...Video signal output terminal, 12.
-...Magnetic tape.
Claims (1)
調器の出力を記録増幅器を介して磁気テープに記録する
記録ヘッドと、前記磁気テープより信号を読み出す再生
ヘッドと、前記再生ヘッドの増幅出力を復調する復調器
とを有する磁気記録再生装置において基準となる磁気媒
体の再生時に基準の映像信号を入力したときの前記周波
数変調器より得られる信号及び再生ヘッドより得られる
信号を前記復調器により復調した信号レベルが同一にな
るように前記周波数変調器を調整するべく、前記変調器
の出力及び前記再生ヘッドの出力を周期的に切り換える
切換回路を設けたことを特徴とする磁気記録再生装置。A frequency modulator that modulates the frequency of a video signal, a recording head that records the output of the frequency modulator onto a magnetic tape via a recording amplifier, a playback head that reads signals from the magnetic tape, and an amplified output of the playback head. In a magnetic recording and reproducing apparatus having a demodulator for demodulating, the demodulator demodulates the signal obtained from the frequency modulator and the signal obtained from the reproduction head when a reference video signal is input during reproduction of a reference magnetic medium. 1. A magnetic recording and reproducing apparatus comprising: a switching circuit that periodically switches the output of the modulator and the output of the reproducing head in order to adjust the frequency modulator so that the signal levels obtained by the recording head are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1201946A JPH0363969A (en) | 1989-08-02 | 1989-08-02 | Magnetic recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1201946A JPH0363969A (en) | 1989-08-02 | 1989-08-02 | Magnetic recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0363969A true JPH0363969A (en) | 1991-03-19 |
Family
ID=16449397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1201946A Pending JPH0363969A (en) | 1989-08-02 | 1989-08-02 | Magnetic recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0363969A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007027374A (en) * | 2005-07-15 | 2007-02-01 | Nippon Mektron Ltd | Reinforcing film for flexible printed circuit board |
-
1989
- 1989-08-02 JP JP1201946A patent/JPH0363969A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007027374A (en) * | 2005-07-15 | 2007-02-01 | Nippon Mektron Ltd | Reinforcing film for flexible printed circuit board |
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