JPH0167882U - - Google Patents
Info
- Publication number
- JPH0167882U JPH0167882U JP1987164105U JP16410587U JPH0167882U JP H0167882 U JPH0167882 U JP H0167882U JP 1987164105 U JP1987164105 U JP 1987164105U JP 16410587 U JP16410587 U JP 16410587U JP H0167882 U JPH0167882 U JP H0167882U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- tracking
- reproduced
- pilot signal
- 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
- 238000005070 sampling Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
Description
第１図は一実施例のトラツキング制御装置を示
す構成図、第２図は静止画像再生を説明する図、
第３図は回転磁気ヘツド装置の一例を示す図、第
４図及び第５図は静止画像再生時の再生出力の一
例を示す波形図である。
Ｈａ，Ｈｂ……通常再生用回転ヘツド、Ｈｃ…
…静止画像再生専用回転ヘツド、１２……パイロ
ツト信号検出回路、１３……掛算回路、１５……
基準パイロツト信号発生回路、１６……スイツチ
回路、２７ａ……スイツチ切換え回路、３０……
制御回路、３１……タイミング信号発生回路、３
２……1/2分周及びスイツチ回路、３３……スイ
ツチ切換え回路、３４……比較回路。
FIG. 1 is a configuration diagram showing a tracking control device of one embodiment, FIG. 2 is a diagram illustrating still image reproduction,
FIG. 3 is a diagram showing an example of a rotating magnetic head device, and FIGS. 4 and 5 are waveform diagrams showing an example of playback output during still image playback. Ha, Hb...Rotary head for normal playback, Hc...
...Rotary head dedicated to still image reproduction, 12...Pilot signal detection circuit, 13...Multiplying circuit, 15...
Reference pilot signal generation circuit, 16... switch circuit, 27a... switch switching circuit, 30...
Control circuit, 31... Timing signal generation circuit, 3
2... 1/2 frequency division and switch circuit, 33... Switch switching circuit, 34... Comparison circuit.
Claims (1)
号とともに映像トラツクに記録し、再生された前
記パイロツト信号に基づいてトラツキングサーボ
をかけるようにしたものにおいて、静止画像再生
時、一対の回転ヘツドからそれぞれの映像トラツ
クに記録された前記パイロツト信号を再生する手
段と、この再生されたパイロツト信号と順次変化
する基準パイロツト信号とを掛算する手段と、ヘ
ツド切換え信号を1/2に分周する分周手段と、こ
の分周信号によつて前記掛算出力信号の極性を切
り換えてトラツキング信号を形成する手段と、一
方の回転ヘツドが記録媒体を１回走査する所定の
タイミングで前記トラツキング信号の瞬時レベル
をサンプリングする手段と、そのサンプリングさ
れた信号レベルと記録媒体上の回転ヘツドの正常
な走査位置で決まる所定の信号レベルとを比較す
る比較手段と、その比較手段の出力によつてトラ
ツキングを行なう制御手段とを備えたことを特徴
とする静止画像再生用トラツキング制御装置。 In an apparatus in which a plurality of pilot signals with different frequencies are recorded together with a video signal on a video track, and a tracking servo is applied based on the reproduced pilot signal, when a still image is reproduced, each image is output from a pair of rotating heads. means for reproducing the pilot signal recorded on the track; means for multiplying the reproduced pilot signal by a sequentially changing reference pilot signal; and frequency dividing means for dividing the head switching signal into 1/2; means for forming a tracking signal by switching the polarity of the multiplication output signal according to the frequency-divided signal; and means for sampling the instantaneous level of the tracking signal at a predetermined timing when one rotary head scans the recording medium once. and a comparison means for comparing the sampled signal level with a predetermined signal level determined by the normal scanning position of the rotary head on the recording medium, and a control means for performing tracking based on the output of the comparison means. A tracking control device for still image reproduction, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987164105U JPH0167882U (en) | 1987-10-26 | 1987-10-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987164105U JPH0167882U (en) | 1987-10-26 | 1987-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0167882U true JPH0167882U (en) | 1989-05-01 |
Family
ID=31449421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987164105U Pending JPH0167882U (en) | 1987-10-26 | 1987-10-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0167882U (en) |
-
1987
- 1987-10-26 JP JP1987164105U patent/JPH0167882U/ja active Pending
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