JP3024165B2 - Magnetic recording / reproducing device - Google Patents
Magnetic recording / reproducing deviceInfo
- Publication number
- JP3024165B2 JP3024165B2 JP2135940A JP13594090A JP3024165B2 JP 3024165 B2 JP3024165 B2 JP 3024165B2 JP 2135940 A JP2135940 A JP 2135940A JP 13594090 A JP13594090 A JP 13594090A JP 3024165 B2 JP3024165 B2 JP 3024165B2
- Authority
- JP
- Japan
- Prior art keywords
- video signal
- output
- signal
- circuit
- control signal
- 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
Links
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、映像信号がない場合に内部発生映像信号を
出力する回路を有する磁気記録再生装置に関するもので
ある。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus having a circuit for outputting an internally generated video signal when there is no video signal.
従来の技術 映像信号無入力時および再生映像信号のないノイズ画
面の状態の時その代わりに内部発生映像信号を出力する
回路を搭載したVTRがある。このVTRの内部発生映像信号
出力のブロック図第２図を用いて従来の構成を説明す
る。ヘッド１より再生された信号は、再生増幅器２より
映像信号処理回路３に入り再生映像信号５として出力さ
れる。また外部映像信号入力４の出力として外部映像信
号６があり、再生時には、再生映像信号５が、記録時に
は外部映像信号６が出力される。出力された映像信号７
は、映像信号判別回路９に入力される。映像信号７が有
る場合は、制御信号10により、映像信号７を選択し11に
出力される。また、出力に映像信号７がない場合は、制
御信号10により内部映像信号発生回路８で、作成された
内部発生映像信号12を選択し11に出力する構成となって
いる。2. Description of the Related Art There is a VTR equipped with a circuit for outputting an internally generated video signal instead of a video signal when there is no input and when there is a noise screen without a reproduced video signal. A conventional configuration will be described with reference to FIG. 2 which is a block diagram of an output of an internally generated video signal of the VTR. The signal reproduced from the head 1 enters the video signal processing circuit 3 from the reproduction amplifier 2 and is output as the reproduced video signal 5. An external video signal 6 is provided as an output of the external video signal input 4. The reproduced video signal 5 is output during reproduction, and the external video signal 6 is output during recording. Output video signal 7
Is input to the video signal determination circuit 9. If there is a video signal 7, the video signal 7 is selected by the control signal 10 and output to 11. When the output does not include the video signal 7, the internal video signal generation circuit 8 selects the generated internally generated video signal 12 based on the control signal 10 and outputs it to the output 11.
発明が解決しようとする課題 映像信号の記録状態が悪い減磁したテープ、ダビング
をくり返し行ったテープ及び磁気テープ上の記録パター
ンがＨ並びしていないテープでの特殊再生時に映像信号
判別回路は、映像信号が有る場合でもノイズ，スキュー
歪により映像信号を検出できなくなり、再生映像信号と
内部発生映像信号を交互に、出力してしまうといったチ
ャタリング状態を起こすこともあり、非常に見苦しい再
生画面となっていた。Problems to be Solved by the Invention A video signal discriminating circuit is used during special reproduction on a demagnetized tape having a bad recording state of a video signal, a tape on which dubbing is repeated, and a tape on which a recording pattern on a magnetic tape is not arranged in H, Even if there is a video signal, the video signal cannot be detected due to noise and skew distortion, and a chattering state in which the reproduced video signal and the internally generated video signal are alternately output may occur, resulting in a very unsightly reproduced screen. I was
課題を解決するための手段 上記課題を解決するために本発明は、映像信号判別出
力に関係なく常に特殊再生時は、内部発生映像信号に切
り換わらないように禁止する構成にしたものである。Means for Solving the Problems In order to solve the above problems, the present invention is configured to always inhibit the switching to the internally generated video signal during the special reproduction regardless of the video signal discrimination output.
作用 本発明は、上記した構成によって、特殊再生時は、再
生映像信号と内部発生映像信号の切り換えを行っている
映像信号判別出力を、特殊再生制御信号で、内部発生映
像信号に切り換わらないように禁止し、常に再生映像信
号を出力することができる。Operation The present invention, with the above-described configuration, prevents a video signal discrimination output that switches between a reproduced video signal and an internally generated video signal from being switched to an internally generated video signal with a special reproduction control signal during special reproduction. And a reproduced video signal can always be output.
実施例 以下、本発明の磁気記録再生装置の一実施例について
図面を参照しながら説明する。Hereinafter, an embodiment of the magnetic recording / reproducing apparatus of the present invention will be described with reference to the drawings.
第１図は、本実施例の構成図である。ヘッド１より再
生された信号は、再生増幅器２より映像信号処理回路３
に入り、再生映像信号５として出力される。再生時には
再生映像信号５が、７に出力される。７に出力された映
像信号は、映像信号判別回路10に入力される。映像信号
が有る場合でかつ通常再生時には制御信号12が13に出力
され、映像信号７を選択し15に出力する。また７の出力
に映像信号のない場合でかつ通常再生時は制御信号12が
13に出力され、内部映像信号発生回路８で作成された内
部映像信号９を選択し、15に出力する。次に特殊再生時
には、映像信号判別回路10の出力12の制御信号が13に出
力されないように、特殊再生制御信号11の出力14により
禁止する構成とした磁気記録再生装置である。FIG. 1 is a configuration diagram of the present embodiment. The signal reproduced from the head 1 is supplied from a reproduction amplifier 2 to a video signal processing circuit 3.
And output as a reproduced video signal 5. During playback, the playback video signal 5 is output to 7. The video signal output to 7 is input to the video signal determination circuit 10. When there is a video signal and at the time of normal reproduction, the control signal 12 is output to 13, and the video signal 7 is selected and output to 15. Also, when there is no video signal at the output of 7 and during normal playback, the control signal 12
The internal video signal 9 output by the internal video signal generating circuit 8 is selected, and is output to 15. Next, the magnetic recording / reproducing apparatus is configured to inhibit the control signal of the output 12 of the video signal discriminating circuit 10 from being output to 13 during the special reproduction by the output 14 of the special reproduction control signal 11.
発明の効果 以上のように本発明によれば、映像信号判別回路が特
殊再生時に再生映像信号を検出できない場合でも、内部
発生映像信号を誤って出力することなく、再生映像信号
を出力するといった効果を得ることができる。As described above, according to the present invention, even when the video signal discriminating circuit cannot detect the reproduced video signal during the special reproduction, the reproduced video signal is output without erroneously outputting the internally generated video signal. Can be obtained.
第１図は本発明の磁気記録再生装置の一実施例の構成を
示すブロック図、第２図は従来例の構成を示すブロック
図である。 ２……再生増幅器、３……映像信号処理回路、４……外
部映像信号入力、８……内部映像信号発生回路、10……
映像信号判別回路、11……特殊再生制御信号。FIG. 1 is a block diagram showing a configuration of an embodiment of a magnetic recording / reproducing apparatus of the present invention, and FIG. 2 is a block diagram showing a configuration of a conventional example. 2 ... Reproduction amplifier, 3 ... Video signal processing circuit, 4 ... External video signal input, 8 ... Internal video signal generation circuit, 10 ...
Video signal discrimination circuit, 11 ... Special reproduction control signal.
Claims (1)
る映像信号と、内部映像信号を出力する内部映像信号発
生回路と、前記映像信号と前記内部映像信号とを切り換
えて出力する第１の切換回路と、前記映像信号が有る場
合には前記第１の切換回路が前記映像信号を選択するた
めの制御信号を出力し前記映像信号のない場合には前記
第１の切換回路が前記内部映像信号を選択するための制
御信号を出力する映像信号判別回路と、特殊再生時に出
力される特殊再生制御信号と、前記特殊再生制御信号が
出力される場合には前記制御信号が第１の切換回路を制
御することを禁止し前記特殊再生制御信号が出力されな
い場合には前記制御信号が第１の切換回路を制御するこ
とを禁止しない第２の切換回路とを具備し、前記第１の
切換回路は前記第２の切換回路により制御することを禁
止された場合には前記映像信号を出力することを特徴と
した磁気記録再生装置。1. A video signal comprising a reproduced video signal reproduced from a head, an internal video signal generating circuit for outputting an internal video signal, and a first switch for switching and outputting the video signal and the internal video signal. A circuit, and when the video signal is present, the first switching circuit outputs a control signal for selecting the video signal, and when there is no video signal, the first switching circuit outputs the internal video signal. A video signal discriminating circuit that outputs a control signal for selecting a video signal, a special reproduction control signal that is output at the time of special reproduction, and the control signal, when the special reproduction control signal is output, the first switching circuit. A second switching circuit that prohibits control and does not prohibit the control signal from controlling the first switching circuit when the special reproduction control signal is not output, wherein the first switching circuit is The said Magnetic recording and reproducing apparatus and outputs the video signal when it is prohibited to be controlled by the switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2135940A JP3024165B2 (en) | 1990-05-25 | 1990-05-25 | Magnetic recording / reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2135940A JP3024165B2 (en) | 1990-05-25 | 1990-05-25 | Magnetic recording / reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0472882A JPH0472882A (en) | 1992-03-06 |
| JP3024165B2 true JP3024165B2 (en) | 2000-03-21 |
Family
ID=15163402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2135940A Expired - Fee Related JP3024165B2 (en) | 1990-05-25 | 1990-05-25 | Magnetic recording / reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3024165B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2792536B2 (en) * | 1995-09-26 | 1998-09-03 | 日本電気株式会社 | Resonant DC-DC converter |
| JP3317950B2 (en) | 2000-01-24 | 2002-08-26 | 甲府日本電気株式会社 | Active clamp forward converter |
-
1990
- 1990-05-25 JP JP2135940A patent/JP3024165B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0472882A (en) | 1992-03-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |