JPS6157774U - - Google Patents
Info
- Publication number
- JPS6157774U JPS6157774U JP14303884U JP14303884U JPS6157774U JP S6157774 U JPS6157774 U JP S6157774U JP 14303884 U JP14303884 U JP 14303884U JP 14303884 U JP14303884 U JP 14303884U JP S6157774 U JPS6157774 U JP S6157774U
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- head
- tape
- field period
- brake
- 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
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 238000001514 detection method Methods 0.000 claims 2
- 230000008929 regeneration Effects 0.000 claims 1
- 238000011069 regeneration method Methods 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Description
第１図ないし第３図はこの考案のビデオテープ
レコーダの１実施例を示し、第１図はキヤプスタ
ン制御部のブロツク図、第２図ａ〜ｑは第１図の
動作説明用タイミングチヤート、第３図はヘツド
トレースの説明図、第４図は従来のヘツドトレー
スの説明図、第５図は従来のキヤプスタン制御部
のブロツク図、第６図ａ〜ｎは第５図の動作説明
用タイミングチヤートである。
２，４，４３…分周器、３…トラツキングモノ
マルチ、５…スタートパルスモノマルチ、６，１
４，２５…ダイオード、８，２１，２７…インバ
ータ、９…フリツプフロツプ、１１…ＦＧアンプ
、１２…三角波作成回路、１３…ピークホールド
回路、１５，３８…スイツチ、１７…正極用アン
プ、１９，２２…アンドゲート、２０，４１…オ
アゲート、２３…トラツキングモノマルチ、２４
…ブレーキパルスモノマルチ、２８〜３１…ゲー
トパルス作成回路、３６…カウンタ、３７…デコ
ーダ、４４…位相比較回路、４５…サンプルホー
ルド回路、４８…速度制御用アンプ。
1 to 3 show one embodiment of the video tape recorder of this invention, FIG. 1 is a block diagram of the capstan control section, FIGS. 2 a to q are timing charts for explaining the operation of FIG. 1, and FIG. 3 is an explanatory diagram of head tracing, FIG. 4 is an explanatory diagram of conventional head tracing, FIG. 5 is a block diagram of a conventional capstan control section, and FIGS. 6 a to n are timing charts for explaining the operation of FIG. 5. It is. 2, 4, 43...Frequency divider, 3...Tracking monomulti, 5...Start pulse monomulti, 6,1
4, 25... Diode, 8, 21, 27... Inverter, 9... Flip-flop, 11... FG amplifier, 12... Triangular wave creation circuit, 13... Peak hold circuit, 15, 38... Switch, 17... Positive electrode amplifier, 19, 22 ...and gate, 20,41...or gate, 23...tracking mono multi, 24
...brake pulse monomulti, 28-31... gate pulse generation circuit, 36... counter, 37... decoder, 44... phase comparison circuit, 45... sample hold circuit, 48... speed control amplifier.
Claims (1)
アジマス角の異なる一方の主、副ビデオヘツドを
有する一方のダブルアジマスヘツド部と、前記一
方の副ビデオヘツドと同一アジマス角の他方の主
ヘツドと前記一方の主ビデオヘツドと同一アジマ
ス角の他方の副ビデオヘツドを有する他方のダブ
ルアジマスヘツド部が設けられ、かつ、前記ヘツ
ドベースの回転検出により形成され１フイールド
期間毎にレベルが反転するＲＦスイツチングパル
スを２／Ｎ（Ｎは３以上の正整数からなるスロー
比の設定数）分周する分周器と、該分周器の出力
信号の立上りまたは立下りにもとづく所定のタイ
ミングでキヤプスタンモータを停止からテープの
標準走行に起動する起動期間設定用のスタートパ
ルスを形成して出力するスタートパルス形成部と
、前記モータの回転検出信号にもとづき前記標準
走行のサーボ制御用の速度制御信号を形成して出
力する速度制御信号形成部と、テープが２トラツ
ク再生される毎に所定のタイミングで正極パルス
と正極パルスとつぎの正極パルスとの間の負極パ
ルスとからなるテープの再生コントロール信号に
もとづき前記スタートパルスの形成からほぼ１フ
イールド期間後に前記モータを前記標準走行から
停止まで制御する制動期間設定用のブレーキパル
ス形成部と、１／Ｎスローモーシヨン再生時に前
記スタートパルス、該スタートパルスの形成から
前記ブレーキパルスの形成までの間の前記速度制
御信号および前記ブレーキパルスを前記モータの
駆動部に供給するゲート部と、前記１／Ｎスロー
モーシヨン再生時に、前記一方の主ビデオヘツド
と前記他方の副ビデオヘツドの１フイールド期間
毎の交互再生と、前記他方の主ビデオヘツドと前
記一方の副ビデオヘツドの１フイールド期間毎の
交互再生とをＮフイールド毎に交互に行なわせる
ヘツド切換部とを備え、前記１／Ｎスローモーシ
ヨン再生時にほぼ１フイールド期間のテープの標
準再生とほぼＮ−１フイールド期間の停止再生と
をくり返すビデオテープレコーダにおいて、前記
ブレーキパルス形成部を、前記正極パルスにより
セツトされるとともに前記回転検出信号を分周し
、前記正極パルスからＮフイールド期間後に擬似
コントロールパルスを出力する擬似コントロール
パルス形成回路と、前記正極パルスと前記擬似コ
ントロールパルスに同期した所定のタイミングで
前記ブレーキパルスを形成するブレーキパルス形
成回路とにより形成したビデオテープレコーダ。 擬似コントロールパルス形成回路を、キヤプ
スタンモータの記録時の位相制御部に設けられた
カウンタと、該カウンタの出力信号をデコードし
て擬似コントロールパルスを出力するデコーダと
により形成した実用新案登録請求の範囲第１項に
記載のビデオテープレコーダ。[Claims for Utility Model Registration] At opposing positions on the circumference of the rotating head base,
One double azimuth head section has main and sub video heads with different azimuth angles, the other main head has the same azimuth angle as the one sub video head, and the other main video head has the same azimuth angle as the one main video head. The other double azimuth head section having a sub-video head is provided, and an RF switching pulse whose level is inverted every field period and which is formed by detecting the rotation of the head base is 2/N (N is a positive integer of 3 or more). a set number of slow ratios consisting of a frequency divider that divides the frequency, and a startup period that starts the capstan motor from stop to normal tape running at a predetermined timing based on the rise or fall of the output signal of the frequency divider. a start pulse forming unit that forms and outputs a start pulse for setting; a speed control signal forming unit that forms and outputs a speed control signal for servo control of the standard travel based on a rotation detection signal of the motor; and a tape. At a predetermined timing every time two tracks are played back, based on a tape playback control signal consisting of a positive pulse and a negative pulse between the positive pulse and the next positive pulse, the start pulse is started approximately one field period after the start pulse is formed. a brake pulse forming unit for setting a braking period that controls the motor from the standard running to a stop, the start pulse during 1/N slow motion regeneration, and the speed control from the formation of the start pulse to the formation of the brake pulse. a gate section for supplying the signal and the brake pulse to the drive section of the motor; and during the 1/N slow motion reproduction, alternately reproducing the one main video head and the other sub video head every one field period; and a head switching unit for alternately reproducing the other main video head and the one sub video head every one field period every N fields; In a video tape recorder that repeatedly performs standard playback of a tape and stop playback for approximately N-1 field period, the brake pulse forming section is set by the positive pulse and divides the frequency of the rotation detection signal, A video tape formed by a pseudo control pulse forming circuit that outputs a pseudo control pulse after an N field period from the pulse, and a brake pulse forming circuit that forms the brake pulse at a predetermined timing synchronized with the positive pulse and the pseudo control pulse. recorder. Claim for utility model registration in which a pseudo control pulse forming circuit is formed by a counter provided in a phase control section of a capstan motor during recording, and a decoder that decodes the output signal of the counter and outputs a pseudo control pulse. A videotape recorder according to scope 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984143038U JPH0741263Y2 (en) | 1984-09-20 | 1984-09-20 | Video tape recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984143038U JPH0741263Y2 (en) | 1984-09-20 | 1984-09-20 | Video tape recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6157774U true JPS6157774U (en) | 1986-04-18 |
| JPH0741263Y2 JPH0741263Y2 (en) | 1995-09-20 |
Family
ID=30701351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984143038U Expired - Lifetime JPH0741263Y2 (en) | 1984-09-20 | 1984-09-20 | Video tape recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0741263Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02266775A (en) * | 1989-04-07 | 1990-10-31 | Sanyo Electric Co Ltd | Helical scan type video tape recorder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57170681A (en) * | 1981-04-13 | 1982-10-20 | Matsushita Electric Ind Co Ltd | Rotary head type magnetic picture recorder/reproducer |
| JPS5875387A (en) * | 1981-10-29 | 1983-05-07 | Sony Corp | Reproducer of video signal |
| JPS5922491A (en) * | 1982-07-29 | 1984-02-04 | Toshiba Corp | Intermittent slow reproducer |
-
1984
- 1984-09-20 JP JP1984143038U patent/JPH0741263Y2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57170681A (en) * | 1981-04-13 | 1982-10-20 | Matsushita Electric Ind Co Ltd | Rotary head type magnetic picture recorder/reproducer |
| JPS5875387A (en) * | 1981-10-29 | 1983-05-07 | Sony Corp | Reproducer of video signal |
| JPS5922491A (en) * | 1982-07-29 | 1984-02-04 | Toshiba Corp | Intermittent slow reproducer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02266775A (en) * | 1989-04-07 | 1990-10-31 | Sanyo Electric Co Ltd | Helical scan type video tape recorder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0741263Y2 (en) | 1995-09-20 |
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