JPS63155404A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPS63155404A JPS63155404A JP30304386A JP30304386A JPS63155404A JP S63155404 A JPS63155404 A JP S63155404A JP 30304386 A JP30304386 A JP 30304386A JP 30304386 A JP30304386 A JP 30304386A JP S63155404 A JPS63155404 A JP S63155404A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- recording
- circuit
- recorded
- 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
- 238000001514 detection method Methods 0.000 claims description 20
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 101100113692 Caenorhabditis elegans clk-2 gene Proteins 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000001454 recorded image Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
Landscapes
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
Description
【発明の詳細な説明】
一産業上の利用分野一
本発明は、磁気記録再生装置、特にスチルビデオカメラ
の記録済み検出回路に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing device, particularly to a recorded detection circuit for a still video camera.
−発明の背景−
スチルビデオカメラ等の磁気記録再生装置では1画像信
号記録に際して、記録済みトラックを避けた記録ができ
るよう、磁気シートの各トラックについて記録の有無を
検出する記録済み検出回路を備える0例えば、スチルビ
デオカメラでは、光学系を通した被写体の駒画像を撮像
素子から読出し、この駒画像を映像信号として磁気シー
トに同心円記録し、その再生画像をテレビ等に表示でき
るようにされるが、B&磁気シート記録済みトラックを
避けた記録によって、以前に記録した画像の誤った消去
を防止する。- Background of the Invention - Magnetic recording and reproducing devices such as still video cameras are equipped with a recorded detection circuit that detects the presence or absence of recording on each track of a magnetic sheet so that recording can be performed while avoiding recorded tracks when recording one image signal. 0 For example, in a still video camera, frame images of a subject are read out from an image sensor through an optical system, these frame images are concentrically recorded on a magnetic sheet as video signals, and the reproduced images can be displayed on a television, etc. However, recording that avoids the B&magnetic sheet recorded tracks prevents previously recorded images from being accidentally erased.
第2図はスチルビデオカメラの記録回路と記録済み検出
回路の構成を示す。同期信号Sを含む輝度信号Y+Sを
輝度信号変調回路lによってFM変調し、線順次色差信
号R−Y/B−Yを色差信号変調回路2によってFM変
調し、再変調回路1.2の出力を混合回路3によって混
合し、記録アンプ4を介して記録再生ヘッド5に記録電
流として供給し、磁気シート6(フロッピーディスク)
の位置決めしたトラックに記録する。この記録信号は、
ヘッド5から再生アンプ7側に読出し、再生回路8によ
る再生で映像信号として取り出される。磁気シート6は
モータ9によって定速回転駆動され、これらモータ9の
速度制御や、ヘッド5の位置制御等はマイクロコンピュ
ータにされるシステムコントローラ10によって制御さ
れる。記録済み検出回路11は、再生アンプ7で再生さ
れるRF@号をレベル増幅回路12で増幅し、次いで積
分増幅器13で積分・増幅し、レベル比較回路14で基
準電圧と比較することでRF信号の有無、すなわち記録
の有無検出信号を得る。この信号に記録有りの信号があ
るときにはシステムコントローラ10がへラド5を次の
トラックに移動させ、再度の記録有無検出を待つ。FIG. 2 shows the configuration of a recording circuit and a recorded detection circuit of a still video camera. The luminance signal Y+S including the synchronization signal S is FM-modulated by the luminance signal modulation circuit 1, the line-sequential color difference signal R-Y/B-Y is FM-modulated by the color-difference signal modulation circuit 2, and the output of the re-modulation circuit 1.2 is Mixed by the mixing circuit 3 and supplied as a recording current to the recording/reproducing head 5 via the recording amplifier 4, the magnetic sheet 6 (floppy disk)
The recorded data is recorded on the positioned track. This recorded signal is
The signal is read out from the head 5 to the reproduction amplifier 7 side, and is reproduced by the reproduction circuit 8 to be taken out as a video signal. The magnetic sheet 6 is rotated at a constant speed by a motor 9, and the speed control of the motor 9, the position control of the head 5, etc. are controlled by a system controller 10 made up of a microcomputer. The recorded detection circuit 11 amplifies the RF@ signal reproduced by the reproduction amplifier 7 with a level amplification circuit 12, then integrates and amplifies it with an integrating amplifier 13, and compares it with a reference voltage with a level comparison circuit 14 to obtain an RF signal. In other words, a recording detection signal is obtained. When this signal includes a recording presence signal, the system controller 10 moves the helad 5 to the next track and waits for detection of recording presence/absence again.
一発明が解決しようとする問題点−
記Q済み検出回路11においては、ヘッド出力電圧的2
00〜300 JLVを再生アンプ7で増幅し、レベル
増幅器12、積分増幅器13によって再生RF信号を直
流成分に変換し、レベル比較回路14で比較する。Problems to be Solved by the Invention In the Q-completed detection circuit 11, the head output voltage is 2.
00 to 300 JLV is amplified by the reproduction amplifier 7, the reproduction RF signal is converted into a DC component by the level amplifier 12 and the integrating amplifier 13, and compared by the level comparison circuit 14.
このため、記録済み検出回路全体の増幅ゲインは、約8
0〜100dBにも及ぶ、このような高帯域高ゲイン増
幅回路の構成は、数段の増幅器を必要とし、回路規模の
大型化、部品点数の増大を招く問題があった。Therefore, the amplification gain of the entire recorded detection circuit is approximately 8
The configuration of such a high-band, high-gain amplifier circuit, which can range from 0 to 100 dB, requires several stages of amplifiers, which poses a problem of increasing the size of the circuit and the number of components.
本発明は、上述の問題点に鑑みてなされたもので、記録
済み検出回路の簡単化を図ることができる磁気記録再生
装置を提供することを目的とする。The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a magnetic recording/reproducing device that can simplify the recorded detection circuit.
一問題点を解決するための手段と作用一本発明は、画像
記録と記録済み検出とが同時に行われないことに着目し
、磁気記録回路に持つビデオヘッド駆動用記録アンプを
記録済み検出回路の読取再生信号増幅器として共用する
構成にし、記録済み検出回路としての総和的な増幅度を
小さくできるようにする。Means and Effects for Solving the Problem The present invention focuses on the fact that image recording and recorded detection are not performed at the same time, and uses a video head drive recording amplifier included in the magnetic recording circuit as a recorded detection circuit. The configuration is such that it is shared as a read and reproduced signal amplifier, so that the total amplification degree as a recorded detection circuit can be reduced.
−実施例−
第1図は本発明の一実施例を示す要部回路図である。同
図が第2図と異なる部分は、混合回路3の出力を切換ス
イッチ15を介して記録アンプ4の入力とし、記録アン
プ4の出力をスイッチ16を介して磁気へラド5の入力
とし、切換スイッチ15の他方の入力にレベル増幅器1
2の出力を与え、記録アンプ4の内部増幅信号出力を積
分増幅器13への入力とした点にある。切換スイッチ1
5とスイッチ16とは連動でシステムコントローラ10
によって切換えられる。-Embodiment- FIG. 1 is a circuit diagram of a main part showing an embodiment of the present invention. The difference between this figure and FIG. 2 is that the output of the mixing circuit 3 is input to the recording amplifier 4 via a changeover switch 15, and the output of the recording amplifier 4 is input to the magnetic head 5 via a switch 16. A level amplifier 1 is connected to the other input of the switch 15.
2, and the internally amplified signal output of the recording amplifier 4 is input to the integrating amplifier 13. Changeover switch 1
5 and switch 16 are linked to the system controller 10.
Switched by.
こうした構成において、映像信号の記録には切換スイッ
チ15を混合回路3側に切換えると共に、スイッチ16
を閉じ、スイッチ15.16を通して記録を行う、この
記録モードに対して、記録済み検出モードでは切換スイ
ッチ15をレベル増幅器lz側に切換ると共に、スイッ
チ16を開放し、記録へラド5からの再生信号を再生ア
ンプ7、レベル増幅器12、スイッチ15、記録アンプ
4の経路で積分増幅器13に導き、レベル比較回路14
で記録済みか否かの検出を行う。In such a configuration, when recording a video signal, the selector switch 15 is switched to the mixing circuit 3 side, and the switch 16 is switched to the mixing circuit 3 side.
is closed and recording is performed through switches 15 and 16. In contrast to this recording mode, in the recorded detection mode, the selector switch 15 is switched to the level amplifier lz side, and the switch 16 is opened, and playback from the RAD 5 to recording is performed. The signal is led to the integrating amplifier 13 via the path of the reproducing amplifier 7, the level amplifier 12, the switch 15, and the recording amplifier 4, and then the level comparing circuit 14.
Detects whether or not it has been recorded.
従って、記録済み検出回路としては、記録アンプ4を増
幅器として利用することができ、レベル増幅器12等の
増幅度を小さくして、すなわち回路規模を小型かつ部品
点数を少ないものにして十分な増幅度と帯域を持つ回路
構成にできる。Therefore, in the recorded detection circuit, the recording amplifier 4 can be used as an amplifier, and the amplification degree of the level amplifier 12 etc. can be made small, that is, the circuit scale can be made small and the number of parts can be reduced to obtain a sufficient amplification degree. It is possible to create a circuit configuration with a bandwidth of
なお、実施例においては、再生機能も持っスチルビデオ
カメラに適用した場合を示したが、本発明はこれに限定
されるものでなく、再生を磁気シート6の取り出しで再
生専用のプレーヤに装着して行うシステムのもの、さら
に他の磁気記録再生装置に適用して同等の作用効果を得
ることができるのは勿論である。In the embodiment, a case has been shown in which the present invention is applied to a still video camera that also has a playback function, but the present invention is not limited to this. It goes without saying that the present invention can be applied to other magnetic recording and reproducing apparatuses to obtain similar effects.
一発明の効果−
以上のとおり、本発明によれば、記録回路の記録アンプ
を記録済み検出回路のRF信号再生増幅のための増幅器
として利用するため、記録済み検出回路の回路規模及び
部品点数の減縮を図ることができる効果がある。Effects of the Invention As described above, according to the present invention, since the recording amplifier of the recording circuit is used as an amplifier for reproducing and amplifying the RF signal of the recorded detection circuit, the circuit scale and number of components of the recorded detection circuit can be reduced. This has the effect of reducing the amount of electricity.
第1図は本発明の一実施例を示す要部回路図、第2図は
従来の磁気記録再生装置の記録回路と記録済み検出回路
の回路図である。
3・・・混合回路、4・・・記録アンプ、5・・・磁気
ヘッド、6・・・磁気シート、7・・・再生アンプ。
8・・・再生回路、lO・・・システムコントローラ、
11・・・記録済み検出回路、12・・・レベル増幅器
、13・・・積分増幅器、14・・・レベル比較回路、
15・・・切換スイッチ、16・・・スイッチ。
特許出願人 小西六写真工業株式会社第2図FIG. 1 is a circuit diagram of a main part showing an embodiment of the present invention, and FIG. 2 is a circuit diagram of a recording circuit and a recorded detection circuit of a conventional magnetic recording/reproducing apparatus. 3...Mixing circuit, 4...Recording amplifier, 5...Magnetic head, 6...Magnetic sheet, 7...Reproducing amplifier. 8... Regeneration circuit, lO... System controller,
11... Recorded detection circuit, 12... Level amplifier, 13... Integrating amplifier, 14... Level comparison circuit,
15... Selector switch, 16... Switch. Patent applicant Konishiroku Photo Industry Co., Ltd. Figure 2
Claims (1)
て、磁気記録回路に持つビデオヘッド駆動用記録アンプ
を記録済み検出回路の読取再生信号増幅器として共用す
る構成にしたことを特徴とする磁気記録再生装置。1) A magnetic recording and reproducing device equipped with a recorded detection circuit, characterized in that a recording amplifier for driving a video head included in the magnetic recording circuit is also used as a reading and reproduction signal amplifier of the recorded detection circuit. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30304386A JPS63155404A (en) | 1986-12-19 | 1986-12-19 | Magnetic recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30304386A JPS63155404A (en) | 1986-12-19 | 1986-12-19 | Magnetic recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63155404A true JPS63155404A (en) | 1988-06-28 |
Family
ID=17916234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30304386A Pending JPS63155404A (en) | 1986-12-19 | 1986-12-19 | Magnetic recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63155404A (en) |
-
1986
- 1986-12-19 JP JP30304386A patent/JPS63155404A/en active Pending
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