JPS55135310A - Video-head switching signal supply circuit - Google Patents
Video-head switching signal supply circuitInfo
- Publication number
- JPS55135310A JPS55135310A JP4108579A JP4108579A JPS55135310A JP S55135310 A JPS55135310 A JP S55135310A JP 4108579 A JP4108579 A JP 4108579A JP 4108579 A JP4108579 A JP 4108579A JP S55135310 A JPS55135310 A JP S55135310A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- video
- adjustment
- head
- video head
- 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
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
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
- G11B15/14—Masking or switching periodically, e.g. of rotating heads
Landscapes
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE:To simplify the adjustment of a circuit by generating a fixed pulse on detecting the rotary phase of a video head or a phase synchronizing with it, and by switching a video head signal by the pulse. CONSTITUTION:The rotary phase of a video head is detected by phase detector 1 and waveform-shaping circuit 2 shapes its detection signal A' into shaped signal B, which is changed into delay output D by monostable multivibrator 4. At the trailing edge of delay output D, pulse generator 13 is triggered to start counting clock signal G from internal signal source 14. Simultaneously, video head swtiching signal F' is changed from H-L and after clock signal G is counted as many as a fixed number, vedio-head switching signal F' is increased in level to H; and then pulse generator 13 is initialized to get ready for the next trigger input. Thus, the adjustement for the duty matching of the video-head switching signal is eliminated to shorten the time of the adjustment and reduce the number of adjustment points, so that the adjustment can be simplified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4108579A JPS55135310A (en) | 1979-04-06 | 1979-04-06 | Video-head switching signal supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4108579A JPS55135310A (en) | 1979-04-06 | 1979-04-06 | Video-head switching signal supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55135310A true JPS55135310A (en) | 1980-10-22 |
Family
ID=12598623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4108579A Pending JPS55135310A (en) | 1979-04-06 | 1979-04-06 | Video-head switching signal supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55135310A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5916107A (en) * | 1982-04-24 | 1984-01-27 | ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Circuit unit for video recorder |
-
1979
- 1979-04-06 JP JP4108579A patent/JPS55135310A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5916107A (en) * | 1982-04-24 | 1984-01-27 | ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Circuit unit for video recorder |
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