JPS59191166A - VTR servo circuit - Google Patents
VTR servo circuitInfo
- Publication number
- JPS59191166A JPS59191166A JP58065560A JP6556083A JPS59191166A JP S59191166 A JPS59191166 A JP S59191166A JP 58065560 A JP58065560 A JP 58065560A JP 6556083 A JP6556083 A JP 6556083A JP S59191166 A JPS59191166 A JP S59191166A
- Authority
- JP
- Japan
- Prior art keywords
- pilot signal
- signal
- circuit
- reproduction
- comparison
- 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 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- WQGWDDDVZFFDIG-UHFFFAOYSA-N pyrogallol Chemical compound OC1=CC=CC(O)=C1O WQGWDDDVZFFDIG-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/46—Controlling, regulating, or indicating speed
- G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
Landscapes
- Control Of Velocity Or Acceleration (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
【発明の詳細な説明】
−〔発明の利用分野〕
本発明はＶ Ｔ Ｉ＜の再生時のキャプスタンモータ制
御回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION - [Field of Application of the Invention] The present invention relates to a capstan motor control circuit during regeneration of V T I<.
従来の再生時に映像トラック内に書き込まれていたパイ
ロット周波数を読み出して、キャプスタンモータを制御
し、ていたシステム図を第１図に示す。以下第１図をも
とに説明する。FIG. 1 shows a system diagram of a conventional system in which a pilot frequency written in a video track is read out during playback to control a capstan motor. This will be explained below based on FIG.
第１図において、１はビデオヘッド、２は記録再生用ア
ンプ、６は１７６回路、４はバンドパスフィルター、５
はアンプ、６はヘッド切換回路、７はパイロット信号発
生回路、８は平衡変調器、９はビート信号検出回路、
ＩＱはキャプスタンモータドライバー回路、である。In Figure 1, 1 is a video head, 2 is a recording/reproducing amplifier, 6 is a 176 circuit, 4 is a band pass filter, 5 is a
is an amplifier, 6 is a head switching circuit, 7 is a pilot signal generation circuit, 8 is a balanced modulator, 9 is a beat signal detection circuit,
IQ is a capstan motor driver circuit.
第１図のシステムでは、記録時にヘッド切換信号と同期
させて異なる周波数の４周波を１トラツクに１周波を割
当て４トラツクごとにくり返し、記録している。そこで
再生時に、再生されたパイロット信号と、パイロット信
号発生回路７とが平衡変調器８に入力され、その出力を
フィルター、積分回路からなる２つのビート信号検出回
路９，９によって検出し、へ、ソド切換回路によりキャ
プスタンモータドライバー１回路に入力するものである
。ビート信号検出回路９゜９を切換えるのは、２つのヘ
ッドによるｃｈｌ。In the system shown in FIG. 1, four different frequencies are assigned to one track in synchronization with a head switching signal during recording, and the recording is repeated every four tracks. Therefore, during reproduction, the reproduced pilot signal and the pilot signal generation circuit 7 are input to the balanced modulator 8, and the output thereof is detected by two beat signal detection circuits 9, 9 consisting of a filter and an integrating circuit, and The input signal is input to one capstan motor driver circuit by a switching circuit. The beat signal detection circuit 9°9 is switched by chl using two heads.
１？Ａ、２のトラックでトレースのずれによるビート信
号の周波数が左右で異なるためである。このシステムで
は、再生時の平衡変調器への比較パイロット信号（α）
は、再生されたパイロット周波数と無関係に平衡変調器
８に入力される。このためキャプスタンモータの位相制
御系の引込時間がかかり、ポータプルＶＴＲで不可欠な
機能である継ぎ撮りの時間がかかりすぎるという問題が
あった。さらに、記録済テープ途中に新たな映像を挿入
する際にも新旧映像のつなぎ目で同様の問題を含んでい
た。1? This is because the frequency of the beat signal on the left and right tracks is different due to the trace shift in tracks A and 2. In this system, the comparison pilot signal (α) to the balanced modulator during regeneration is
is input to the balanced modulator 8 regardless of the regenerated pilot frequency. For this reason, there is a problem in that it takes time to pull in the phase control system of the capstan motor, and it takes too much time to perform continuous shooting, which is an essential function in a portable VTR. Furthermore, when inserting new video into the middle of a recorded tape, a similar problem occurs at the joint between the old and new video.
本発明の目的は従来回路では時間のかかったキャプスタ
ンモータの位相引込時間を短縮したＶＴＲを提供するこ
とにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a VTR in which the capstan motor phase pull-in time, which took a long time in conventional circuits, is shortened.
本発明では、再生時の比較用パイロット信号娑再生バづ
ロット信号から作ることにより問題点を解決したもので
ある。In the present invention, the problem is solved by creating a pilot signal for comparison during reproduction from a reproduced batch signal.
本発明によるＶＴＲのシステム図を第２図に示す。第２
図において第１図と同じ番号のものは同じ回路であり、
１１はＰＬＬ回路である。A system diagram of a VTR according to the present invention is shown in FIG. Second
In the figure, the same numbers as in Figure 1 are the same circuits,
11 is a PLL circuit.
第２図のシステムでは、再生パイロｙ）信号（５＋をＰ
ＬＬ回路回路１付０
ことにより比較用パイロット信号（σ）は常に再生パイ
ロット信号と同じものが入る。この結果。In the system shown in Figure 2, the regenerated pyro y) signal (5+ is
LL circuit circuit 1 attached 0 Therefore, the comparison pilot signal (σ) is always the same as the reproduced pilot signal. As a result.
従来システムで問題となっていた，長生パイロット信号
と比較用パイロット信号が同一信号周波数になるまでの
時間を大巾に短縮することかり能となるものである。
゛
〔発明の効果〕
本発明によれば，従来システムで問題となっていた，キ
ャプスタンモータ制御回路の位相系引込時間が大巾に短
縮され、継ぎ撮り時、インサート記録時の不具合を解決
することができる。This greatly reduces the time it takes for the long-lived pilot signal and comparison pilot signal to reach the same signal frequency, which was a problem with conventional systems.
[Effects of the Invention] According to the present invention, the phase system pull-in time of the capstan motor control circuit, which was a problem with conventional systems, is greatly shortened, and problems during continuous shooting and insert recording are solved. be able to.
第１図は従来の制御システムの例を示す？゛ロック図．
第２図は本発明の一実施例を示すフ゛ロック図である。
１・・、ビデオヘッド
７・・・パイロット信号発生回路
８・・・平衡変調器
９・・・ビート信号検出回路
１０・・キャプスタンモータドライノく一回路１１・・
・ＰＬＬ回路Figure 1 shows an example of a conventional control system? Lock diagram.
FIG. 2 is a block diagram showing one embodiment of the present invention. 1...Video head 7...Pilot signal generation circuit 8...Balance modulator 9...Beat signal detection circuit 10...Capstan motor dry nozzle circuit 11...
・PLL circuit
Claims (1)
て再生サーボに使用するパイロット信号を書き込む第１
の手段、再生時て該パイロット信号を前記映像記録／再
生ヘッドを介して再生する第２の手段、第２の手段によ
り再生されたパイロット信号と比較用パイロット信号と
の差成分を取りだす第６の手段、該手段により得られた
情報により磁気テープの速度制御を行なうＶＴＲサーボ
回路において、前記第２の手段により得られた再生パイ
ロット信号ｆ Ｐ Ｌ Ｌに入力し、得られた出力信号
を前記比較用パイロット信号として使用することを特徴
としたＶＴ Ｒザーボ回路。The first one writes a pilot signal used for the playback servo through the video recording/playback head into the video track during recording.
a second means for reproducing the pilot signal through the video recording/reproducing head during reproduction; and a sixth means for extracting a difference component between the pilot signal reproduced by the second means and the comparison pilot signal. means, in a VTR servo circuit that controls the speed of the magnetic tape using the information obtained by the means, inputs the reproduction pilot signal fPLL obtained by the second means, and compares the obtained output signal with the A VTR servo circuit characterized by being used as a pilot signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58065560A JPS59191166A (en) | 1983-04-15 | 1983-04-15 | VTR servo circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58065560A JPS59191166A (en) | 1983-04-15 | 1983-04-15 | VTR servo circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59191166A true JPS59191166A (en) | 1984-10-30 |
Family
ID=13290511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58065560A Pending JPS59191166A (en) | 1983-04-15 | 1983-04-15 | VTR servo circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59191166A (en) |
-
1983
- 1983-04-15 JP JP58065560A patent/JPS59191166A/en active Pending
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