JPH0520826B2 - - Google Patents
Info
- Publication number
- JPH0520826B2 JPH0520826B2 JP58118093A JP11809383A JPH0520826B2 JP H0520826 B2 JPH0520826 B2 JP H0520826B2 JP 58118093 A JP58118093 A JP 58118093A JP 11809383 A JP11809383 A JP 11809383A JP H0520826 B2 JPH0520826 B2 JP H0520826B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- data
- pulse
- pcm
- synchronization
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 3
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ビデオテープレコーダ（以下VTR
と呼ぶ）又は、その一部を利用して標準テレビジ
ヨン信号に準拠したRCM信号を録音再生する
PCM録音再生装置に関し、VTRから再生される
際のジツターやドロツプアウト等により、あるい
は早送り再生や巻戻し再生モードにした時に信号
が短時間途切れたり、あるいはつなぎ録音した時
のつなぎ目のフルイレースされた未記録部分の再
生時には正確な信号処理が行なわれないので、そ
の時には瞬間にデジタル信号あるいはアナログ信
号の出力にミユーテイングをかけ誤まつた信号を
出さないよう信号処理を行ない、正確なPCM信
号再生が行なえるようにしたものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention applies to video tape recorders (hereinafter referred to as VTRs).
) or use part of it to record and play back RCM signals compliant with standard television signals.
Regarding PCM recording and playback equipment, the signal may be interrupted for a short time due to jitter or dropout when playing back from a VTR, or when switching to fast forward playback or rewind playback mode, or full erased unused material at the joint when recording continuously. Accurate signal processing is not performed when playing back the recorded portion, so at that time, the output of the digital signal or analog signal is instantaneously muted to perform signal processing to prevent the output of erroneous signals, and to perform accurate PCM signal playback. It was designed so that
（従来例の構成とその問題点）
第１図ａはPCM信号の垂直区間、第１図ｂは
PCM信号の水平区間、第１図ｃは水平同期信号
とデータ同期信号、１０１０の相対関係を示した
ものである。このPCM信号フオーマツトの垂直
同期信号、水平同期信号、データ同期信号が途絶
えると雑音発生の原因となり、何らかの手段で補
なつてやるか信号出力を遮断したりする必要があ
る。(Conventional configuration and its problems) Figure 1a shows the vertical section of the PCM signal, Figure 1b shows the vertical section of the PCM signal.
The horizontal interval of the PCM signal, FIG. 1c, shows the relative relationship between the horizontal synchronization signal and the data synchronization signal 1010. If the vertical synchronization signal, horizontal synchronization signal, and data synchronization signal of this PCM signal format are interrupted, it will cause noise generation, and it is necessary to compensate for it by some means or to cut off the signal output.
（発明の目的）
本発明は、信号処理に必要な同期信号がなくな
つた時には、信号出力を遮断して不要な音を出さ
ないようにミユーテイングをかけたPCM録音再
生装置を提供するものである。(Object of the Invention) The present invention provides a PCM recording and playback device that mutes so that when a synchronization signal necessary for signal processing is lost, signal output is cut off and unnecessary sound is not emitted. .
（発明の構成）
本発明は、水平同期信号を検出してからデータ
同期信号を検出するまでの時間幅を検出し、その
幅が標準フオーマツト信号幅に対してある一定幅
である場合にはパルスを発生させて、そのパルス
が途絶えた場合には出力を遮断して雑音の発生を
防止するようにうしたものである。(Structure of the Invention) The present invention detects the time width from when a horizontal synchronization signal is detected to when a data synchronization signal is detected, and when the width is a certain width with respect to the standard format signal width, a pulse is generated. is generated, and when the pulse is interrupted, the output is cut off to prevent the generation of noise.
（実施例の説明）
第２図は本発明の一実施例を示すブロツク図で
ある。１はVTRから再生されたPCM信号の入力
端子、２は第１図のスライスレベルＤでPCM信
号をスライスしたデータ信号で、３はそのデータ
信号２中よりデータ同期信号１０１０を検出した
信号、４は同様に第１図のスライスレベルＳでス
ライスした同期信号、５はその同期信号４より水
平同期信号を検出した信号である。(Description of Embodiment) FIG. 2 is a block diagram showing an embodiment of the present invention. 1 is the input terminal of the PCM signal reproduced from the VTR, 2 is the data signal obtained by slicing the PCM signal at the slice level D in FIG. 1, 3 is the signal in which the data synchronization signal 1010 is detected from the data signal 2, 4 is a synchronization signal similarly sliced at the slice level S in FIG. 1, and 5 is a signal obtained by detecting a horizontal synchronization signal from the synchronization signal 4.
第２図のＡ部は、水平同期検出信号５とデータ
同期検出信号３との幅を検出し、標準フオーマツ
ト信号幅に対して、ある一定幅以内である場合に
はパルス６を発生させるものである。第２図のＢ
部は、パルス６がくると17水平区間以上のパルス
７を発生させるものであり、連続してパルス６が
くるとパルス７も連続して発生しつづける。ここ
で、17水平区間以上のパルス７を発生する理由
は、データ信号の存在する区間が制御信号として
のパルス７によつて特定することができ、再生す
るのに好まざる影響を及ぼす信号、例えば、標準
の水平同期信号の前部の欠落、データ信号の一部
が欠落、水平同期信号とデータ信号に疑似信号が
発生して、再生時にデータの頭出し同期が誤つた
り、データを復調出来なかつたり、誤り検出訂正
が不能になつたりする、いわゆる不要なデータを
通過させないよつに制御できる。この場合、各フ
イールドにおいて、1Hあるいは2Hの余裕を考慮
して、かつ、精度を上げるには、信号再生期間を
奇数フイールド区間で18H、偶数フイールド区間
では17Hとすることが最良である。第２図のＣ部
は、パルス７が発生している間は入力信号８をそ
のまま出力し、パルス７が途絶えたら出力信号９
へ、入力してくる信号８を遮断しようとするもの
である。ここで扱う入力信号は、デジタル信号で
あつたりアナログ信号であつたりする。 Part A in Fig. 2 detects the width of the horizontal synchronization detection signal 5 and data synchronization detection signal 3, and generates a pulse 6 if the width is within a certain width with respect to the standard format signal width. be. B in Figure 2
The part generates pulses 7 over 17 horizontal sections when pulse 6 comes, and when pulses 6 come consecutively, pulses 7 also continue to be generated continuously. Here, the reason for generating pulses 7 over 17 horizontal sections is that the section in which the data signal exists can be specified by the pulse 7 as a control signal, and signals that have an unfavorable influence on reproduction, such as , the front part of the standard horizontal sync signal is missing, a part of the data signal is missing, a pseudo signal is generated between the horizontal sync signal and the data signal, and the synchronization at the beginning of the data may be incorrect during playback, or the data may not be demodulated. It is possible to control so-called unnecessary data that does not pass through, or that makes error detection and correction impossible. In this case, in order to take into account a margin of 1H or 2H in each field and to improve accuracy, it is best to set the signal reproduction period to 18H in the odd field section and 17H in the even field section. Section C in Fig. 2 outputs the input signal 8 as is while the pulse 7 is occurring, and when the pulse 7 is interrupted, the output signal 9 is output.
This is intended to block the input signal 8. The input signals handled here can be digital signals or analog signals.
なお、遮断手段回路Ｃにおいて、入力されるア
ナログ信号が、たとえ無信号であつたとしても、
水平同期信号やデータ信号がなくなるわけではな
いので、水平同期信号やデータ信号の欠落や、疑
似信号がなければ、入力してくる信号８は遮断さ
れずに出力信号９として出力される。 In addition, even if the input analog signal is no signal in the interrupting means circuit C,
Since the horizontal synchronization signal and data signal do not disappear, unless the horizontal synchronization signal or data signal is missing or there is no pseudo signal, the input signal 8 is not blocked and is output as the output signal 9.
（発明の効果）
本発明は、PCM信号中の水平同期信号とデー
タ同期信号の相対関係が所定のフオーマツトでな
くなつた時には入力信号を遮断して、雑音等の発
生のない高品位のPCM録音再生を可能にするも
のである。(Effects of the Invention) The present invention cuts off the input signal when the relative relationship between the horizontal synchronization signal and the data synchronization signal in the PCM signal is no longer in a predetermined format, and enables high-quality PCM recording without noise. It enables playback.
第１図はPCM信号フオーマツトを示す図、第
２図は本発明のブロツク図である。
１……入力端子、２……データ信号、３……デ
ータ同期検出信号、４……同期信号、５……水平
同期検出信号、６……所定フオーマツト時のパル
ス発生信号、７……17水平区間以上のパルス発生
信号、８……入力信号、９……出力信号。
FIG. 1 is a diagram showing a PCM signal format, and FIG. 2 is a block diagram of the present invention. 1...Input terminal, 2...Data signal, 3...Data synchronization detection signal, 4...Synchronization signal, 5...Horizontal synchronization detection signal, 6...Pulse generation signal at predetermined format, 7...17 horizontal Pulse generation signal over the interval, 8...input signal, 9...output signal.
Claims (1)
の水平同期信号と、データ同期信号との相対時間
差が一定幅以内である場合にパルスを発生させる
第１の手段と、その第１の手段のパルスが発生す
るとデータ信号の存在する区間を特定し、かつ再
生時にデータの頭出し同期の誤り、データを復調
出来なかつたり、誤り検出訂正が不能になつたり
する不要なデータを通過させないようにするため
偶数フイールド区間を基に定めた17水平同期区間
以上のパルスを発生する第２の手段と、第２の手
段によるパルスが発生している時は入力信号をそ
のまま出力し、第２の手段によるパルスが発生し
ていない時には入力信号を遮断する第３の手段と
を備えたことを特徴とするPCM記録再生装置。1. A first means for generating a pulse when the relative time difference between a horizontal synchronization signal of a PCM signal conforming to a standard television signal and a data synchronization signal is within a certain width, and a pulse of the first means is generated. Then, in order to identify the section where the data signal exists, and to prevent unnecessary data from passing through that would cause an error in data cue synchronization, inability to demodulate data, or inability to perform error detection and correction during playback, an even field is set. A second means that generates pulses for 17 horizontal synchronization intervals or more determined based on the interval, and when a pulse is generated by the second means, the input signal is output as is, and a pulse is generated by the second means. A PCM recording and reproducing device characterized by comprising: third means for cutting off an input signal when the input signal is not being input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11809383A JPS6013359A (en) | 1983-07-01 | 1983-07-01 | Pulse code modulation recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11809383A JPS6013359A (en) | 1983-07-01 | 1983-07-01 | Pulse code modulation recording and reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6013359A JPS6013359A (en) | 1985-01-23 |
| JPH0520826B2 true JPH0520826B2 (en) | 1993-03-22 |
Family
ID=14727821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11809383A Granted JPS6013359A (en) | 1983-07-01 | 1983-07-01 | Pulse code modulation recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6013359A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0529030Y2 (en) * | 1988-06-08 | 1993-07-26 | ||
| JPH02100467U (en) * | 1989-01-30 | 1990-08-09 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5654612A (en) * | 1979-10-05 | 1981-05-14 | Trio Kenwood Corp | Muting control circuit for reproducer of pcm signal |
| JPS5687208A (en) * | 1979-12-17 | 1981-07-15 | Pioneer Electronic Corp | Data section extracting circuit in reproducing device of video format pcm signal |
-
1983
- 1983-07-01 JP JP11809383A patent/JPS6013359A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5654612A (en) * | 1979-10-05 | 1981-05-14 | Trio Kenwood Corp | Muting control circuit for reproducer of pcm signal |
| JPS5687208A (en) * | 1979-12-17 | 1981-07-15 | Pioneer Electronic Corp | Data section extracting circuit in reproducing device of video format pcm signal |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6013359A (en) | 1985-01-23 |
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