JPS6381574U - - Google Patents
Info
- Publication number
- JPS6381574U JPS6381574U JP17702686U JP17702686U JPS6381574U JP S6381574 U JPS6381574 U JP S6381574U JP 17702686 U JP17702686 U JP 17702686U JP 17702686 U JP17702686 U JP 17702686U JP S6381574 U JPS6381574 U JP S6381574U
- Authority
- JP
- Japan
- Prior art keywords
- switch
- output
- control signal
- pair
- switching
- 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 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は本考案の一実施例を示す回路ブロツク
図、第２図は再生走査跡と出力波形説明図をそれ
ぞれ顕わす。
Ｍ１，Ｍ２……主ヘツド、Ｓ１，Ｓ２……副ヘ
ツド、ＳＷ１，ＳＷ２……第１・第２スイツチ、
ＳＷ３……第３スイツチ、６……エンベロープ検
波回路、７……同期検波回路、８……キヤプスタ
ンサーボ回路。
FIG. 1 is a circuit block diagram showing an embodiment of the present invention, and FIG. 2 shows a reproduced scanning trace and an output waveform explanatory diagram. M1, M2...Main head, S1, S2...Sub head, SW1, SW2...First and second switches,
SW3...Third switch, 6...Envelope detection circuit, 7...Synchronized detection circuit, 8...Capstan servo circuit.
Claims (1)
ヘツド対と該主ヘツド対とはアジマス関係を逆に
して該主ヘツド対に近接して１８０°対向配置せ
しめられた副ヘツド対と、ＲＦスイツチングパル
スに基づき前記主ヘツド対の再生出力を選択する
第１スイツチと、前記ＲＦスイツチングパルスに
基づき前記副ヘツド対の再生出力を選択する第２
スイツチと、ｎ倍速再生時に再生コントロール信
号に基づきスイツチング制御信号を形成するスイ
ツチング制御信号発生回路と、該スイツチング制
御信号に基づいて前記第１・第２スイツチのスイ
ツチング出力を選択する第３スイツチとを配して
成るビデオテープレコーダに於て、 前記第３スイツチの出力を入力するエンベロー
プ検波回路と、 前記スイツチング制御信号の２倍の周波数を呈
する基準信号発生回路と、 前記エンベロープ検波回路の出力を前記基準信
号にて同期検波する同期検波回路と、 該同期検波回路の出力を位相制御入力するキヤ
プスタンサーボ回路とを、 それぞれ配して成る倍速再生用トラツキング制
御回路。[Claims for Utility Model Registration] A pair of main heads arranged 180° opposite each other with different azimuths, and the main head pair is arranged close to the main head pair 180° opposite each other with the azimuth relationship reversed. a first switch that selects the reproduction output of the pair of secondary heads based on the RF switching pulse; and a second switch that selects the reproduction output of the pair of secondary heads based on the RF switching pulse.
a switching control signal generation circuit that generates a switching control signal based on a playback control signal during n-times speed playback, and a third switch that selects switching outputs of the first and second switches based on the switching control signal. A video tape recorder comprising: an envelope detection circuit receiving the output of the third switch; a reference signal generating circuit exhibiting a frequency twice that of the switching control signal; and an output of the envelope detection circuit receiving the output of the third switch. A tracking control circuit for double-speed playback comprising a synchronous detection circuit that performs synchronous detection using a reference signal, and a capstan servo circuit that inputs the output of the synchronous detection circuit for phase control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17702686U JPS6381574U (en) | 1986-11-18 | 1986-11-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17702686U JPS6381574U (en) | 1986-11-18 | 1986-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6381574U true JPS6381574U (en) | 1988-05-28 |
Family
ID=31117838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17702686U Pending JPS6381574U (en) | 1986-11-18 | 1986-11-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6381574U (en) |
-
1986
- 1986-11-18 JP JP17702686U patent/JPS6381574U/ja active Pending
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