JPH03198487A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPH03198487A JPH03198487A JP1339549A JP33954989A JPH03198487A JP H03198487 A JPH03198487 A JP H03198487A JP 1339549 A JP1339549 A JP 1339549A JP 33954989 A JP33954989 A JP 33954989A JP H03198487 A JPH03198487 A JP H03198487A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- video
- counting
- time
- video 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.)
- Pending
Links
- 238000000926 separation method Methods 0.000 claims description 29
- 230000001360 synchronised effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000005236 sound signal Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
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- Television Signal Processing For Recording (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、再生する信号が映像信号であることを判別し
、映像信号のみを再生する磁気記録再生装置に関するも
のである、
従来の技術
従来の磁気記録再生装置の一例を第３図のビデオフロッ
ピー再生装置のブロック図に基づいて説明する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording and reproducing device that determines that a signal to be reproduced is a video signal and reproduces only the video signal. An example of a recording and reproducing apparatus will be explained based on the block diagram of a video floppy reproducing apparatus shown in FIG.
従来のフロッピー再生装置は、ビデオフロッピー１に記
録した信号をピックアップする磁気ヘッド２、磁気ヘッ
ド２でピックアップしたＦＭ信号を増幅する再生増幅回
路３、再生増幅回路３で増幅したＦＭ信号をＦＭ復調す
るＦ ｂｌ復調回路４゜ＦＭ復調した信号の映像信号処
理を行う映像信号処理回路５．および映像信号処理回路
５で処理した映像信号を出力するビデオ出力回路６から
構成されている。A conventional floppy playback device includes a magnetic head 2 that picks up a signal recorded on a video floppy 1, a playback amplification circuit 3 that amplifies the FM signal picked up by the magnetic head 2, and an FM demodulation of the FM signal amplified by the playback amplification circuit 3. F bl demodulation circuit 4° Video signal processing circuit that performs video signal processing of the FM demodulated signal 5. and a video output circuit 6 that outputs the video signal processed by the video signal processing circuit 5.
以下、Ｌ記従来のビデオフロッピー再生装置の動作を説
明する。The operation of the conventional video floppy playback device will be described below.
ビデオフロッピーエに記録された信号を再生する場合、
ビデオフロッピー１に記録された信号を１ａ気ヘツド２
でピックアップし、ピックアップしたＦＭ信号を再生増
幅回路３で増幅し、ＦＭ復調回路４で復調し、映像信号
処理回路５で信号処理を行い ビデオ出力回路６で出力
し、テレビモニタやビデオプリンタなどに接続し再生す
る。When playing back signals recorded on a video floppy disk,
Transfer the signal recorded on video floppy 1 to 1a head 2.
The picked-up FM signal is amplified by a regenerative amplifier circuit 3, demodulated by an FM demodulation circuit 4, processed by a video signal processing circuit 5, and outputted by a video output circuit 6 to a TV monitor, video printer, etc. Connect and play.
発明が解決しようとする課題
しかしながらｔ記のような構成ではビデオフロッピーｌ
に記録した信号を再生したときに、ビデオフロッピー１
に記録された信号が映像信号以外ノ信号、たとえば音声
信号の場合、テレビモニタに再生したときに音声信号特
有の信号パターンが再生され非常に見苦しいという問題
があった。Problems to be Solved by the Invention However, in the configuration described in T, video floppy l
When playing back the signal recorded on the video floppy 1
When the recorded signal is a signal other than a video signal, for example an audio signal, there is a problem in that when the signal is reproduced on a television monitor, a signal pattern peculiar to the audio signal is reproduced, making it very unsightly.
本発明はｔ記課題を解決するものであり、映像信号以外
の特有の信号パターンの再生を防止した磁気記録再生装
置を提供することを目的とするものである。The present invention has been made to solve the above problem, and aims to provide a magnetic recording/reproducing device that prevents the reproduction of unique signal patterns other than video signals.
課題を解決するための手段
を記問題を解決するため本発明の磁気記録再生装置は、
磁気記録媒体に記録した信号を再生する再生手段と、前
記再生手段の出力信号が映像信号か否かを判別する映像
信号判別手段を備えたものである。Means for Solving the Problems In order to solve the problems, the magnetic recording and reproducing apparatus of the present invention has the following features:
The apparatus includes a reproducing means for reproducing a signal recorded on a magnetic recording medium, and a video signal determining means for determining whether the output signal of the reproducing means is a video signal.
第２の発明は、Ｆ記第１の発明の映像信号判別手段を、
再生手段の出力信号から同期パルスを分離する信分分離
手段と、前記信分分離手段で分離された同期パルスが映
像同期パルスか否かを判別することにより前記再生手段
の出力信号が映像信号か否かを判別する判定手段から構
成したものであり、第３の発明はこの第２の発明の判定
手段を、信分分離手段で分離された同期パルスの数を計
数する時間を設定する計数時間設定手段と、前記計数時
間設定手段で設定された時間中の前記信分分離手段の同
期パルスの数を計数し、その計数値が所定値内にあれば
前記信分分離手段の同期パルスを映像同期パルスと判別
する計数手段から構成したものである。また第４の発明
は、第２の発明の判定手段を、信分分離手段で分離され
た同期パルスの時間幅を計数し、所定の時間幅の同期パ
ルスのみを出力する第１の計数手段と、前記信分分離手
段の同期パルスの数を計数する時間を設定する計数時間
設定手段と、前記計数時間設定手段で設定された時間中
の前記第１の計数手段の出力パルスの数を計数し、その
計数値が所定値内にあれば。A second invention provides the video signal discriminating means of the first invention described in F,
A signal separation means for separating a synchronization pulse from an output signal of the reproduction means, and determining whether the output signal of the reproduction means is a video signal by determining whether or not the synchronization pulse separated by the signal separation means is a video synchronization pulse. A third invention comprises a determining means for determining whether or not the signal is rejected, and a third invention is characterized in that the determining means of the second invention includes a counting time for setting a time for counting the number of synchronizing pulses separated by the signal separation means. counting the number of synchronous pulses of the signal separating means during the time set by the setting means and the counting time setting means, and if the counted value is within a predetermined value, the synchronous pulse of the signal separating means is imaged. It consists of a counting means for distinguishing it from a synchronous pulse. Further, a fourth invention provides a first counting means for counting the time width of the synchronizing pulses separated by the signal separation means and outputting only the synchronizing pulses having a predetermined time width. , counting time setting means for setting a time for counting the number of synchronous pulses of the signal separation means, and counting the number of output pulses of the first counting means during the time set by the counting time setting means. , if the count value is within the predetermined value.
信分分離手段の同期パルスを映像同期パルスと判別する
第２の計数手段から構成したものである。The second counting means distinguishes the synchronizing pulse of the signal separation means from the video synchronizing pulse.
作用
丘記第１の発明の構成により、磁気記録媒体に記録され
た信号を再生するとき、再生された信号が映像信号かど
うかが判別され、映像信号のみを再生出力することが可
能となる。According to the configuration of the first aspect of the invention, when a signal recorded on a magnetic recording medium is reproduced, it is determined whether the reproduced signal is a video signal or not, and it becomes possible to reproduce and output only the video signal.
また第２の発明の構成により、信分分離手段によって再
生信号から分離した同期パルスを映像同期パルスと判別
することで、再生信号が映像信号と判別され、さらに第
３の発明あるいは第４の発明の構成により、信分分離手
段の同期パルスの数。Further, according to the configuration of the second invention, the synchronization pulse separated from the reproduction signal by the signal separation means is determined to be a video synchronization pulse, whereby the reproduction signal is determined to be a video signal. Due to the configuration of the number of synchronization pulses of the signal separation means.
あるいはパルスの時間幅で選択された同期パルスの数を
設定時間中計数し計数値が所定値内であれば信分分離手
段の同期パルスが映像同期パルスと判別される。Alternatively, the number of synchronization pulses selected by the pulse time width is counted during a set time, and if the counted value is within a predetermined value, the synchronization pulse of the signal separation means is determined to be a video synchronization pulse.
実施例
以下、本発明の一実施例を図面に基づいて説明する。な
お、従来例の第３図の構成と同一の構成には同一の符号
を付して説明を省略する。EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. It should be noted that the same components as those of the conventional example shown in FIG.
第１図は本発明の一実施例を示すビデオフロッビー再生
装置のブロック図である。FIG. 1 is a block diagram of a video floppy playback device showing an embodiment of the present invention.
本発明のビデオフロッピー装置は、従来の再生増幅回路
３．ＦＭ復調回路４．映像信号処理回路５、ビデオ出力
回路６に新たに、映像信号処理回路５の出力信号から同
期パルスを分離する信号分離回路７と、信号分離回路７
で分離された同期パルスの数のカウントを行い、カウン
ト値が２６２から２８２の同になれば再生した信号を映
像信号と判別しビデオ出力回路６の出力を許可する許可
信号を出力する同期パルスカウンタ８と、同期パルスカ
ウンタ８がカウントする時間を１垂直向期期間に設定す
るカウント時間設定回路９とを付加して構成している。The video floppy device of the present invention differs from the conventional regenerative amplifier circuit 3. FM demodulation circuit 4. The video signal processing circuit 5 and the video output circuit 6 are newly provided with a signal separation circuit 7 that separates a synchronization pulse from the output signal of the video signal processing circuit 5, and a signal separation circuit 7.
A synchronous pulse counter that counts the number of synchronous pulses separated by , and when the count value becomes the same from 262 to 282, it determines that the reproduced signal is a video signal and outputs a permission signal to permit the output of the video output circuit 6. 8 and a count time setting circuit 9 for setting the time counted by the synchronous pulse counter 8 to one vertical synchronization period.
なお、映像信号と判別するパルス数を２６２から２８２
の間にした理由は、正規の映像同期パルス数は１垂直向
期期間内に２７２（ＮＴＳＣ方式）であり、信号分離回
路７にノイズの多い映像信号が入力されたとき、信号分
離回路７の出力ζこノイズ部分のパルスが発生し、映像
信号を映像信号ではないと誤判別する可能性が有るため
ト限を余裕を設けて２８２に設定し、通常音声信号を再
生したとき、信号分離回路７の出力パルス数は映像信号
再生時の数倍になるが１トラツク中の無音部分が多い場
合、映像信号再生時より少なくなる可能性があるため下
限を２６２に設定した。In addition, the number of pulses to be determined as a video signal is set from 262 to 282.
The reason for this is that the normal number of video synchronization pulses is 272 (NTSC system) within one vertical synchronization period, and when a noisy video signal is input to the signal separation circuit 7, the signal separation circuit 7 Since pulses in the noise part of the output may occur and the video signal may be misjudged as not being a video signal, the limit is set to 282 with a margin, and when a normal audio signal is played back, the signal separation circuit The number of output pulses of 7 is several times as large as when reproducing a video signal, but if there are many silent parts in one track, there is a possibility that the number of output pulses will be less than when reproducing a video signal, so the lower limit was set to 262.
Ｅ記構成のビデオフロッピー再生装置の動作を説明する
。The operation of the video floppy playback device having the configuration described in E will be explained.
信号分離回路７から出力された同期パルスを。The synchronization pulse output from the signal separation circuit 7.
映像同期パルスカウンタ１０でカウントしカウント値が
２６２から２８２の間になれば再生した信号を映像信号
と判別してビデオ出力回路６Ｉこ出力許可信号を入力し
再生を許可する。The video synchronization pulse counter 10 counts and when the count value is between 262 and 282, the reproduced signal is determined to be a video signal and an output permission signal is input to the video output circuit 6I to permit reproduction.
このように、信号分離回路７の出力同期パルス数をカウ
ントすることにより映像信号の判別ができ、映像信号の
みを再生することができ、映像信号以外の信号特有の見
苦しい信号パターンの再生を防止することができる。さ
らにアナログ再生信号から映像信号を検出するより判別
精度がよくすることができ、また回路を簡素化できる。In this way, by counting the number of output synchronization pulses of the signal separation circuit 7, it is possible to distinguish the video signal, and only the video signal can be reproduced, thereby preventing the reproduction of unsightly signal patterns peculiar to signals other than video signals. be able to. Furthermore, the discrimination accuracy can be improved compared to detecting a video signal from an analog playback signal, and the circuit can be simplified.
本発明の他の実施例を第２図に示すビデオフロッピー再
生装置のブロック図に基づいて説明する。Another embodiment of the present invention will be described based on the block diagram of a video floppy playback device shown in FIG.
なお、第１図の実施例と同一の構成には同一の符号を付
して説明を省略する。Note that the same components as those in the embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.
第２図に示すビデオフロッピー再生装置は、信号分離回
路７から出力された同期パルスの時間幅をカウントし、
４μｓｅｃから６μｓｅｃ 期間に入るパルスのみを
出力するパルス時間カウンタ１０を設け。The video floppy playback device shown in FIG. 2 counts the time width of the synchronization pulses output from the signal separation circuit 7,
A pulse time counter 10 is provided that outputs only pulses within a period of 4 μsec to 6 μsec.
映像同期パルスカウンタ８でパルス時間カウンタ１０の
出力パルスをカウントするように構成している。４μｓ
ｅｃから６μｓｅｃ期間のパルスを抜き出すことにより
、音声信号を再生したときの信号分離回路１０の出力を
禁止し、水平同期パルスのみを抜き出し、ノイズによる
誤判別を防止する。The video synchronous pulse counter 8 is configured to count the output pulses of the pulse time counter 10. 4μs
By extracting a pulse with a period of 6 μsec from ec, the output of the signal separation circuit 10 is inhibited when an audio signal is reproduced, and only the horizontal synchronizing pulse is extracted, thereby preventing misjudgment due to noise.
以下、第２図に示すビデオフロッピー再生装置の動作を
説明する。The operation of the video floppy playback apparatus shown in FIG. 2 will be explained below.
信号分離回路７から出力された同期パルスの時間幅をパ
ルス時間カウンタ１０でカウントし、４μＳｅｃから６
μＳｅｃ期間のパルスのみ出力し、映像同期パルスカウ
ンタ１０でカウントし、カウント値が２６２から２８２
の間になれば再生した信号を映像信号と判別してビデオ
出力回路６に出力許可信号を入力し再生を許可する。The time width of the synchronization pulse output from the signal separation circuit 7 is counted by the pulse time counter 10, and the time width is counted from 4 μSec to 6
Output only pulses with a period of μSec and count them with the video synchronization pulse counter 10, and the count value will be between 262 and 282.
If the reproduced signal is determined to be a video signal, an output permission signal is input to the video output circuit 6 to permit reproduction.
このように、カウント時間設定回路９で設定された時間
内に信号分離回路７から出力され、たノイズに対する映
像信号の誤判別の防止が可能になり。In this way, it is possible to prevent misjudgment of the video signal due to noise that is output from the signal separation circuit 7 within the time set by the count time setting circuit 9.
判別精度を向丘させることができる。Discrimination accuracy can be improved.
発明の効果
以上のように第１の発明によれば、磁気記録媒体に記録
された信号が映像信号かどうかを判別することにより映
像信号のみを再生することが可能となり、映像信号以外
の信号、たとえば音声信号を再生した場合、音声信号特
有の見苦しい信号パターンの再生を防止することができ
る。Effects of the Invention As described above, according to the first invention, by determining whether the signal recorded on the magnetic recording medium is a video signal, it is possible to reproduce only the video signal, and it is possible to reproduce signals other than the video signal, For example, when an audio signal is reproduced, it is possible to prevent unsightly signal patterns peculiar to the audio signal from being reproduced.
また第２の発明によれば、信分分離手段の同期パルスが
映像同期パルスか否かを判別することにより、アナログ
再生信号から映像信号を検出するよりも判別精度が良く
なるという効果を得ることができる。Further, according to the second invention, by determining whether or not the synchronizing pulse of the signal separation means is a video synchronizing pulse, it is possible to obtain an effect that the determination accuracy is better than that of detecting a video signal from an analog playback signal. I can do it.
さらに第３の発明によれば、信分分離手段の同期パルス
の数を計数することにより非常に回路が簡素化でき、ま
た第４の発明によれば、信分分離手段の同期パルスの時
間幅をカウントすることにより、さらに判別精度が良く
なるという効果を得ることができる。Furthermore, according to the third invention, the circuit can be greatly simplified by counting the number of synchronizing pulses of the signal separating means, and according to the fourth invention, the time width of the synchronizing pulse of the signal separating means By counting , it is possible to obtain the effect of further improving the discrimination accuracy.
第１図は本発明の磁気記録再生装置の一実施例を示すビ
デオフロッピー再生装置のブロック図。
第２図は本発明の磁気記録再生装置の他の実施例を示す
ビデオフロッピー再生装置のブロック図。
第３図は従来のビデオフロッピー再生装置のブロック図
である。
１・・・ビデオフロッピー、２・・・磁気ヘッド、３・
・・再生増幅回路、４・・・ＦＭ復調回路、５・・・映
像信号処理回路、６・・・ビデオ出力回路、７・・・信
号分離回路％８・・・映像同期パルスカウンタ、９・・
・カウント時間設定回路、 １０・−・パルス時間カウ
ンタ。FIG. 1 is a block diagram of a video floppy playback device showing an embodiment of the magnetic recording and playback device of the present invention. FIG. 2 is a block diagram of a video floppy playback device showing another embodiment of the magnetic recording and playback device of the present invention. FIG. 3 is a block diagram of a conventional video floppy playback device. 1...Video floppy, 2...Magnetic head, 3.
... Regenerative amplifier circuit, 4... FM demodulation circuit, 5... Video signal processing circuit, 6... Video output circuit, 7... Signal separation circuit %8... Video synchronization pulse counter, 9.・
・Count time setting circuit, 10.--Pulse time counter.
Claims (1)
、前記再生手段の出力信号が映像信号か否かを判別する
映像信号判別手段を備えた磁気記録再生装置。 ２、映像信号判別手段を、再生手段の出力信号から同期
パルスを分離する信号分離手段と、前記信号分離手段で
分離された同期パルスが映像同期パルスか否かを判別す
ることにより前記再生手段の出力信号が映像信号か否か
を判別する判定手段から構成した請求項１記載の磁気記
録再生装置。 ３、判定手段を、信号分離手段で分離された同期パルス
の数を計数する時間を設定する計数時間設定手段と、前
記計数時間設定手段で設定された時間中の前記信号分離
手段の同期パルスの数を計数し、その計数値が所定値内
にあれば前記信号分離手段の同期パルスを映像同期パル
スと判別する計数手段から構成した請求項２記載の磁気
記録再生装置。 ４、判定手段を、信号分離手段で分離された同期パルス
の時間幅を計数し、所定の時間幅の同期パルスのみを出
力する第１の計数手段と、前記信号分離手段の同期パル
スの数を計数する時間を設定する計数時間設定手段と、
前記計数時間設定手段で設定された時間中の前記第１の
計数手段の出力パルスの数を計数し、その計数値が所定
値内にあれば、信分分離手段の同期パルスを映像同期パ
ルスと判別する第２の計数手段から構成した請求項２記
載の磁気記録再生装置。[Scope of Claims] 1. A magnetic recording and reproducing apparatus comprising a reproducing means for reproducing a signal recorded on a magnetic recording medium, and a video signal determining means for determining whether an output signal of the reproducing means is a video signal. 2. The video signal discriminating means includes a signal separating means for separating the synchronizing pulse from the output signal of the reproducing means, and a signal separating means for separating the synchronizing pulse from the output signal of the reproducing means by determining whether or not the synchronizing pulse separated by the signal separating means is a video synchronizing pulse. 2. The magnetic recording and reproducing apparatus according to claim 1, further comprising determining means for determining whether the output signal is a video signal. 3. The determination means includes a counting time setting means for setting a time for counting the number of synchronization pulses separated by the signal separation means, and a counting time setting means for setting the time for counting the number of synchronization pulses separated by the signal separation means, and a count time setting means for setting the time for counting the number of synchronization pulses separated by the signal separation means, and a count time setting means for setting the time for counting the number of synchronization pulses separated by the signal separation means, and a count time setting means for setting the number of synchronization pulses of the signal separation means during the time set by the counting time setting means. 3. The magnetic recording and reproducing apparatus according to claim 2, further comprising a counting means for counting the number of signals and determining the synchronizing pulse of the signal separating means as a video synchronizing pulse if the counted value is within a predetermined value. 4. The determination means includes a first counting means that counts the time width of the synchronization pulses separated by the signal separation means and outputs only synchronization pulses with a predetermined time width; a counting time setting means for setting the counting time;
The number of output pulses of the first counting means during the time set by the counting time setting means is counted, and if the counted value is within a predetermined value, the synchronization pulse of the signal separation means is set as the video synchronization pulse. 3. The magnetic recording and reproducing apparatus according to claim 2, further comprising second counting means for determining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1339549A JPH03198487A (en) | 1989-12-26 | 1989-12-26 | Magnetic recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1339549A JPH03198487A (en) | 1989-12-26 | 1989-12-26 | Magnetic recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03198487A true JPH03198487A (en) | 1991-08-29 |
Family
ID=18328522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1339549A Pending JPH03198487A (en) | 1989-12-26 | 1989-12-26 | Magnetic recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03198487A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6275264B1 (en) | 1997-01-17 | 2001-08-14 | Samsung Electronics Co., Ltd. | Method and apparatus for detecting a synchronous signal |
| US6606410B2 (en) | 1997-01-17 | 2003-08-12 | Samsung Electronics Co., Ltd. | Method and apparatus for detecting a synchronous signal |
-
1989
- 1989-12-26 JP JP1339549A patent/JPH03198487A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6275264B1 (en) | 1997-01-17 | 2001-08-14 | Samsung Electronics Co., Ltd. | Method and apparatus for detecting a synchronous signal |
| US6606410B2 (en) | 1997-01-17 | 2003-08-12 | Samsung Electronics Co., Ltd. | Method and apparatus for detecting a synchronous signal |
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