JPS5810259U - Head servo circuit - Google Patents
Head servo circuitInfo
- Publication number
- JPS5810259U JPS5810259U JP1981102474U JP10247481U JPS5810259U JP S5810259 U JPS5810259 U JP S5810259U JP 1981102474 U JP1981102474 U JP 1981102474U JP 10247481 U JP10247481 U JP 10247481U JP S5810259 U JPS5810259 U JP S5810259U
- Authority
- JP
- Japan
- Prior art keywords
- rotation
- speed
- converter
- servo circuit
- drum motor
- 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.)
- Granted
Links
Landscapes
- Control Of Electric Motors In General (AREA)
- Control Of Velocity Or Acceleration (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来回路の一例を示すブロック系統図、第２図
は本考案回路の一実施例を示すブロック系統図である。
１・・・・・・ドラムモータ、４，１５．２０・・・・
・・Ｆ−■コンバータ、６・・・・・・ドラムピックア
ップヘッド、１１・・・・・・位相比較器、１３．１９
・・・・・・切換スイッチ、１６・・・・・・基準電圧
源、１７・・・・・・再生水平同期信号入力端子、１８
・・・・・・１分周器、２１・・・・・・周波数発電機
（ＦＧ）。FIG. 1 is a block diagram showing an example of a conventional circuit, and FIG. 2 is a block diagram showing an embodiment of the circuit of the present invention. 1...Drum motor, 4,15.20...
...F-■ converter, 6 ... drum pickup head, 11 ... phase comparator, 13.19
......Selector switch, 16...Reference voltage source, 17...Reproduction horizontal synchronization signal input terminal, 18
...1 Frequency divider, 21 ... Frequency generator (FG).
Claims (1)
転させるドラムモータのサーボ回路において、少なくと
も高速再生以外の通常再生時に回転検出器より取り出さ
れた上記ドラムモータの回転速度に応じた繰り返し周波
数の回転検出パルスを周波数−電圧変換し、その出力電
圧を上記ドラムモータへ供給して回転速度制御を行なう
Ｆ−Ｖコンバータに対し、高速再生時は該回転検出パル
スに代えて再生水平同期信号又はこれと一定の周波数比
関係にある信号を供給し、該Ｆ−Ｖコンバータの出力電
圧と一定の基準電圧とにより高速再生時の再生水平走査
周波数が所定の一定値で再生されるように該Ｆ−Ｖコン
バータを高速再生時にも共用して該ドラムモータの回転
制御を行なうよう構成したヘッドサーボ回路。 ２ 高速再生時に該Ｆ−Ｖコンバータに供給される信号
周波数を、通常再生時の該回転検出器の出力回転検出パ
ルスの繰り返し周波数と同一とするよう構成した実用新
案登録請求の範囲第１項記載のへラドサーボ回路。[Claims for Utility Model Registration] 1. In a servo circuit for a drum motor that rotates a rotary head that reproduces a recorded green signal from a recording medium, at least the drum motor that is taken out from a rotation detector during normal playback other than high-speed playback. In contrast to the F-V converter, which performs frequency-to-voltage conversion of the rotation detection pulse with a repetition frequency corresponding to the rotation speed and supplies the output voltage to the drum motor to control the rotation speed, during high-speed reproduction, the rotation detection pulse is Instead, a reproduced horizontal synchronizing signal or a signal having a constant frequency ratio relationship therewith is supplied, and the reproduced horizontal scanning frequency during high-speed reproduction is maintained at a predetermined constant value by the output voltage of the F-V converter and a constant reference voltage. A head servo circuit configured to use the F-V converter also during high-speed reproduction to control the rotation of the drum motor. 2. Utility model registration claimed in claim 1, which is configured so that the signal frequency supplied to the F-V converter during high-speed reproduction is the same as the repetition frequency of the output rotation detection pulse of the rotation detector during normal reproduction. Herad servo circuit.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981102474U JPS5810259U (en) | 1981-07-10 | 1981-07-10 | Head servo circuit |
| US06/396,293 US4521815A (en) | 1981-07-10 | 1982-07-08 | Reproducing apparatus capable of performing high-speed reproduction of a video signal |
| KR2019820005434U KR900001541Y1 (en) | 1981-07-10 | 1982-07-10 | Recording reproducing apparatus |
| DE3225888A DE3225888C2 (en) | 1981-07-10 | 1982-07-10 | Video signal playback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981102474U JPS5810259U (en) | 1981-07-10 | 1981-07-10 | Head servo circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5810259U true JPS5810259U (en) | 1983-01-22 |
| JPS6245307Y2 JPS6245307Y2 (en) | 1987-12-03 |
Family
ID=29897117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1981102474U Granted JPS5810259U (en) | 1981-07-10 | 1981-07-10 | Head servo circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5810259U (en) |
-
1981
- 1981-07-10 JP JP1981102474U patent/JPS5810259U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6245307Y2 (en) | 1987-12-03 |
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