JPS60150205A - Varying device for recording signal level of magnetic recorder - Google Patents
Varying device for recording signal level of magnetic recorderInfo
- Publication number
- JPS60150205A JPS60150205A JP522384A JP522384A JPS60150205A JP S60150205 A JPS60150205 A JP S60150205A JP 522384 A JP522384 A JP 522384A JP 522384 A JP522384 A JP 522384A JP S60150205 A JPS60150205 A JP S60150205A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- recording
- control
- level
- converter
- 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
-
- 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
- G11B5/027—Analogue recording
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は磁気記録装置の記録信号レベル可変装置に係り
、記録信号レベルをデジタル制御信号によって可変でき
る記録信号レベル可変装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording signal level variable device for a magnetic recording device, and more particularly to a recording signal level variable device capable of varying the recording signal level using a digital control signal.
従来技術
磁気記録再生装置において、信号の磁気テープへの最適
記録レベルをめるに際し、従来、予め標準磁気テープの
特性を測定して記録レベルの設定値をめておき、次に標
準信号を入力し、磁気ヘッドの記録電流が上記設定値に
なるように記録アンプの入力調整用半固定抵抗を調整し
ていた。Conventional technology In magnetic recording and reproducing devices, when determining the optimal recording level of a signal onto a magnetic tape, conventionally, the characteristics of the standard magnetic tape are measured in advance to determine the set value of the recording level, and then the standard signal is input. However, the semi-fixed resistor for input adjustment of the recording amplifier was adjusted so that the recording current of the magnetic head would be at the above set value.
発明が解決しようとする問題点
ところが上記従来の方法では、人手及び手間を多く必要
とし、これにより製造コストが高くなる問題点があった
。又、このものは機械的調整であるので経年変化を生じ
易い問題点があった。更に、特性の異なる磁気テープの
性能を十分に引出し得ない問題点があった。。Problems to be Solved by the Invention However, the above-mentioned conventional method requires a lot of manpower and effort, which has the problem of increasing manufacturing costs. Furthermore, since this method is mechanically adjusted, it has the problem of being susceptible to deterioration over time. Furthermore, there is a problem in that the performance of magnetic tapes having different characteristics cannot be fully exploited. .
問題点を解決するための手段
本発明は、磁気ヘッドに供給する記録信号のレベルをデ
ジタル制御信号によって可変する手段と、デジタル制御
信号のデータを格納されており、デジタル制御信号を所
定タイミングで順次送出する手段とからなる構成として
上記問題点を解決したものであり、以下、図面と共にそ
の一実施例について説明する。Means for Solving the Problems The present invention includes means for varying the level of a recording signal supplied to a magnetic head using a digital control signal, and a means for storing data of the digital control signal. The above-mentioned problem is solved by a configuration consisting of a sending means, and one embodiment thereof will be described below with reference to the drawings.
実施例
近年、テレビジョン信号をデジタル信号処理して映像す
るテレビジョソ受像機が開発されているが（例えば、［
日経エレクトロニクスＪ １９８１．．１．１−２３、
Ｐ、２３３〜２４７） 、本願発明のものもデジタル
信号処理を行なう磁気記録再生装置に適用される。Examples In recent years, television receivers have been developed that digitally process television signals and display images (for example, [
Nikkei Electronics J 1981. ．． 1.1-23,
P, 233-247), the invention of the present application is also applied to a magnetic recording/reproducing device that performs digital signal processing.
記録時、第１図（Ａ）に示すように、端子１に入来した
信号はアンプ２にて増幅された後Ａ、Ｄ変換器３にてデ
ジタル信号に変換され、信号処理回路４に供給されてこ
こで周知の如き輝度信号・搬送色信号分離、ＦＭ変調、
搬送色信号周波数変換。During recording, as shown in FIG. 1(A), the signal that enters the terminal 1 is amplified by the amplifier 2, then converted to a digital signal by the A/D converter 3, and then supplied to the signal processing circuit 4. Here, the well-known luminance signal/carrier color signal separation, FM modulation,
Carrier color signal frequency conversion.
ＡＰＣ，ＡＣＣ，プリエンファシス等の各動作をデジタ
ル信号で処理され、しかφ後ＡＤ換器５でアナログ信号
に変換され、アンプ６にて増幅された後磁気ヘッド７に
て磁気テープ８に記録される。Each operation such as APC, ACC, and pre-emphasis is processed as a digital signal, which is then converted into an analog signal by an AD converter 5, amplified by an amplifier 6, and then recorded on a magnetic tape 8 by a magnetic head 7. Ru.
一方、再生時、同図（Ｂ”）に示すように、磁気テープ
８から磁気ヘッド７にて再生された映像信号はプリアン
プ９にて増幅された後ＡＤ変換器１０にてデジタル信号
に変換され、信号処理回路１１に供給されてここで周知
の如き輝度ＦＭ信号・搬送色信号分離、ＦＭ復調、搬送
色信号周波数変換、ＡＰＣ，ＡＣＣ，ディエンファシス
、ノイズ制限等の各動作をデジタル信号で処理され、し
かる後Ｄ’Ａ変換器１２でアナログ信号に変換されて端
子１３より取出される。On the other hand, during playback, as shown in FIG. , is supplied to the signal processing circuit 11, where the well-known operations such as luminance FM signal/carrier color signal separation, FM demodulation, carrier color signal frequency conversion, APC, ACC, de-emphasis, noise restriction, etc. are processed using digital signals. After that, it is converted into an analog signal by the D'A converter 12 and taken out from the terminal 13.
第２図（Ａ）、（Ｂ）は夫々本発明になる磁気記録装置
の記録信号レベル可変装置を適用し得る磁気記録再生装
置の記録系及び再生系のブロック系統図を示す。１４は
例えばＣＰＵ等にて構成された制御回路であり、メモリ
（例えば電源が遮断されても情報内容が失なわれないＥ
ＥＰＲＯＭ（エレクトリック・イレーザブル・プログラ
マブル・ＲＯＭ）’）２２内のプログラムに応じて第３
図に示すフローチャートに従った動作が行なわれる。FIGS. 2A and 2B are block diagrams of a recording system and a reproducing system of a magnetic recording and reproducing apparatus to which the variable recording signal level device for a magnetic recording apparatus according to the present invention can be applied, respectively. Reference numeral 14 denotes a control circuit composed of, for example, a CPU, and a memory (for example, an E memory whose information content is not lost even if the power is cut off).
Depending on the program in the EPROM (Electric Erasable Programmable ROM) 22,
Operations according to the flowchart shown in the figure are performed.
記録時、第２図（Δ）において、制御回路１４からイン
タフェース１８を介して第４図（Ａ）に示すスイッチン
グ信号ａが取出され、スイッチ回路１５はオフとされて
（第、３図中ステップ５０）ＡＤ変換器３から、の信号
が遮断され、これに代って５ＭＨｚのキャリア周波数信
号（テスト用信号）がインタフェース１９を介して取出
される（ステップ５１）。テスト用信号は加算器１６を
介して信号処理回路４のＦＭ変調器４ａに供給されてＦ
Ｍ変調され、ＤΔ変換器５にてアナログ信号に変換され
て電圧制御アンプ１７に供給される。During recording, in FIG. 2 (Δ), the switching signal a shown in FIG. 4 (A) is taken out from the control circuit 14 via the interface 18, and the switch circuit 15 is turned off (step 50) The signal from the AD converter 3 is cut off, and instead, a 5 MHz carrier frequency signal (test signal) is taken out via the interface 19 (step 51). The test signal is supplied to the FM modulator 4a of the signal processing circuit 4 via the adder 16.
The signal is M-modulated, converted into an analog signal by the DΔ converter 5, and supplied to the voltage control amplifier 17.
ここで、制御回路１４のゲイン可変部１４１から動作時
間制御部１４２の動作タイミングに応じたゲイン可変制
御信号が取出され、インタフェース２０を介してＤＡ変
換器２１にてアナログ信号に変換されて電圧制御アンプ
１７に制御電圧として供給され、電圧制御アンプ１７の
ゲインをステップ状に可変する（ステップ５２）。これ
により、テスト用信号は記録レベルをステップ状に可変
され、磁気テープ８に第４図（Ｂ）に示すように記録さ
れる。Here, a variable gain control signal corresponding to the operation timing of the operation time control section 142 is taken out from the variable gain section 141 of the control circuit 14, and is converted into an analog signal by the DA converter 21 via the interface 20, and is used for voltage control. The voltage is supplied to the amplifier 17 as a control voltage, and the gain of the voltage control amplifier 17 is varied in steps (step 52). As a result, the recording level of the test signal is varied stepwise and recorded on the magnetic tape 8 as shown in FIG. 4(B).
テスト用信号の記録レベルをステップ状に可変する手段
としては上記実施例のものの他に、第５図（Ａ＞、（Ｂ
）に示す回路が考えられる。同図（Ａ）に示す回路は、
アンプ２３の入出力端間に設けられたＤＡ変換器２４（
実質的には負帰還紙５−
抗）の抵抗値をメモリ２２からのゲイン可変制御信号で
可変してアンプ２３のゲインを可変し、アンプ２３の出
力を記録アンプ２５を介して取出す。In addition to the means of the above embodiment, means for varying the recording level of the test signal in steps are shown in FIGS.
) can be considered. The circuit shown in Figure (A) is
A DA converter 24 (
Substantially, the resistance value of the negative feedback paper 5 is varied by a gain variable control signal from the memory 22 to vary the gain of the amplifier 23, and the output of the amplifier 23 is taken out via the recording amplifier 25.
同図（Ｂ）に示す回路は、ＤＡ変換器２６の抵抗値をメ
モリ２２からのゲイン可変制御信号で可変して入力信号
のレベルを可変し、ＤＡ変換器２６の出力を記録アンプ
２５を介して取出す。The circuit shown in FIG. 2B changes the resistance value of the DA converter 26 using a variable gain control signal from the memory 22 to vary the level of the input signal, and outputs the output of the DA converter 26 via the recording amplifier 25. and remove it.
再生時、第２図（Ｂ）において、テスト用信号を記録さ
れた磁気テープ８は制御回路１４からのテープ巻戻し制
御信号５より巻戻されて再生され（ステップ５３）、再
生出力レベルは例えば第４図（Ｃ）に示す波形とされる
。During playback, in FIG. 2(B), the magnetic tape 8 on which the test signal has been recorded is rewound and played back by the tape rewind control signal 5 from the control circuit 14 (step 53), and the playback output level is, for example, The waveform is shown in FIG. 4(C).
制御回路１４の動作時間制御部１４２からの動作タイミ
ング制御信号がインタフェース２８を介′してサンプリ
ング・レベル・デテクタ２７に供給され、サンプリング
・レベル・デテクタ２７の動作タイミンクが順次可変さ
れる（ステップ５４）。The operation timing control signal from the operation time control section 142 of the control circuit 14 is supplied to the sampling level detector 27 via the interface 28, and the operation timing of the sampling level detector 27 is sequentially varied (step 54). ).
各動作時間における再生出力レベルが常に監視されてお
り、時刻ｔで再生出力の最大値が検出されると（ステッ
プ５５）、記録時この信号を記録し−〇−
た時［のＤＡ変換器２１のレジスタの値がメモリ２２に
格納される（ステップ５６）。この値が最適記録できる
アンプ１７のゲインを得る値である。The playback output level at each operating time is constantly monitored, and when the maximum value of the playback output is detected at time t (step 55), when this signal is recorded at the time of recording, the DA converter 21 The value of the register is stored in the memory 22 (step 56). This value is the value for obtaining the gain of the amplifier 17 that allows optimal recording.
」：記調整を磁気ヘッドの右チャンネル及び左チャンネ
ルについて夫々行なう。”: Perform the above adjustment for the right channel and left channel of the magnetic head, respectively.
なお、第４図（Δ）に示す信号ａをドラムパルスとして
１フィールド期間において記録レベルを可変して記録す
る他、数フィールドを１単位として記録レベルを可変し
て記録するようにしてもよい。In addition to recording with the signal a shown in FIG. 4 (Δ) being a drum pulse and varying the recording level in one field period, it is also possible to record with varying the recording level in units of several fields.
効果
上述の如く、本発明になる磁気記録装置の記録信号レベ
ル可変装置は、磁気ヘッドに供給する記録信号のレベル
をデジタル制御信号によって可変する手段と、デジタル
制御信号のデータを格納されており、デジタル制御信号
を所定タイミングで順次送出する手段とよりなるため、
記録信号レベルをＣＰＵ等のデジタル制御信号を用いて
可変でき、これににす、例えば、磁気テープからの信号
レベルを上記所定タイミングで検出してその最大再生レ
ベルを検出する装置に適用でき、このため、最適記録レ
ベルを自動的に設定し得、アンプの入力調整用半固定抵
抗を調整していた従来のものに比して人手や手間が少な
くて済み、製造コストが低く、又、電子的調整であるの
で経年変化を生じることはなく、更に、磁気テープの特
性に合った最適記録レベルを設定し得る等の特長を有す
る。Effects As described above, the recording signal level variable device for a magnetic recording device according to the present invention includes means for varying the level of the recording signal supplied to the magnetic head using a digital control signal, and data for the digital control signal is stored. It consists of a means for sequentially sending digital control signals at predetermined timing,
The recorded signal level can be varied using a digital control signal from a CPU or the like, and it can be applied to, for example, a device that detects the signal level from a magnetic tape at the predetermined timing and detects its maximum playback level. Therefore, the optimum recording level can be automatically set, requiring less manpower and effort compared to the conventional method of adjusting semi-fixed resistors for input adjustment of the amplifier, lowering manufacturing costs, and reducing electronic Since it is an adjustment, it does not change over time, and it also has the advantage of being able to set the optimum recording level that matches the characteristics of the magnetic tape.
第１図（Ａ）、（Ｂ）は夫々デジタル信号処理可能な一
般の磁気記録再生装置の概略ブロック系統図、第２図（
Ａ）、（Ｂ）は夫々本発明装置の一実施例を適用し得る
磁気記録再生装置の記録系及び再生系のブロック系統図
、第３図は本発明装置の動作説明用フローチャート、第
４図（Ａ）〜（Ｃ）は本発明装置の動作説明用タイミン
グチャート、第５図（、Ａ）、（Ｂ）は本発明装置の他
の実施例の一部のブロック系塾図である。
１・・・入力端子、３．１０・・・ＡＤ変換器、５゜１
２．２１．２’４．２６・・・ＤＡ変換器、７・・・磁
気ヘッド、８・・・磁気テープ、１４・・・制御回路、
１４電・・・ゲイン可変部、１４２・・・動作時間制御
部、１７・・・電圧制御アンプ、１８．１９．２０．２
８・・・インタフェース、２２・・・メモリ、２３．２
５・・・アンプ、２７・・・サンプリング・レベル・デ
テクタ。
９−
第１頁の続き
０発 明 者 吉 １） 政 二 横浜市神奈Ｊ１社内Figures 1 (A) and (B) are schematic block diagrams of a general magnetic recording/reproducing device capable of digital signal processing, and Figure 2 (
A) and (B) are block system diagrams of a recording system and a reproducing system of a magnetic recording/reproducing apparatus to which an embodiment of the apparatus of the present invention can be applied, FIG. 3 is a flowchart for explaining the operation of the apparatus of the present invention, and FIG. 5A to 5C are timing charts for explaining the operation of the device of the present invention, and FIGS. 5A and 5B are block diagrams of a part of another embodiment of the device of the present invention. 1...Input terminal, 3.10...AD converter, 5゜1
2.21.2'4.26...DA converter, 7...Magnetic head, 8...Magnetic tape, 14...Control circuit,
14... Gain variable section, 142... Operating time control section, 17... Voltage control amplifier, 18.19.20.2
8... Interface, 22... Memory, 23.2
5...Amplifier, 27...Sampling level detector. 9- Continued from page 1 0 Inventor Yoshi 1) Seiji Yokohama City Kana J1 Company
Claims (1)
信号によって可変する手段と、該デジタル制御信号のデ
ータを格納されており、該デジタル制御信号を所定タイ
ミングで順次送出する手段とにりなることを特徴とする
磁気記録装置の記録信号レベル可変装置。It is characterized by comprising means for varying the level of the recording signal supplied to the magnetic head using a digital control signal, and means for storing data of the digital control signal and sequentially transmitting the digital control signal at a predetermined timing. A recording signal level variable device for a magnetic recording device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP522384A JPS60150205A (en) | 1984-01-13 | 1984-01-13 | Varying device for recording signal level of magnetic recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP522384A JPS60150205A (en) | 1984-01-13 | 1984-01-13 | Varying device for recording signal level of magnetic recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60150205A true JPS60150205A (en) | 1985-08-07 |
Family
ID=11605191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP522384A Pending JPS60150205A (en) | 1984-01-13 | 1984-01-13 | Varying device for recording signal level of magnetic recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60150205A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6258402A (en) * | 1985-09-06 | 1987-03-14 | Sony Corp | Method and instrument for measuring optimum recording current in video tape recorder |
| JPH02121160A (en) * | 1988-10-28 | 1990-05-09 | Akai Electric Co Ltd | Recording level controller for signal recording/ reproducing device of helical scan system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5358212A (en) * | 1976-11-08 | 1978-05-26 | Hitachi Denshi Ltd | Magnetic current optimization system |
-
1984
- 1984-01-13 JP JP522384A patent/JPS60150205A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5358212A (en) * | 1976-11-08 | 1978-05-26 | Hitachi Denshi Ltd | Magnetic current optimization system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6258402A (en) * | 1985-09-06 | 1987-03-14 | Sony Corp | Method and instrument for measuring optimum recording current in video tape recorder |
| JPH02121160A (en) * | 1988-10-28 | 1990-05-09 | Akai Electric Co Ltd | Recording level controller for signal recording/ reproducing device of helical scan system |
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