JPS628775U - - Google Patents
Info
- Publication number
- JPS628775U JPS628775U JP9877085U JP9877085U JPS628775U JP S628775 U JPS628775 U JP S628775U JP 9877085 U JP9877085 U JP 9877085U JP 9877085 U JP9877085 U JP 9877085U JP S628775 U JPS628775 U JP S628775U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- reproduction
- switching
- dropout
- magnetic heads
- 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
- 238000001514 detection method Methods 0.000 claims 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Television Signal Processing For Recording (AREA)
Description
第１図、第９図夫々は本考案装置の各実施例の
ブロツク系統図、第２図は本考案装置に用いられ
る磁気ヘツドを説明するための図、第３図は従来
装置の一例のブロツク系統図、第４図は本考案装
置で再生されるテープの既記録映像トラツクパタ
ーンとその走査を説明するための図、第５図、第
８図夫々は第１図示の装置各部の信号波形図、第
６図は第１図示の装置の一部の回路図、第７図は
第６図示の回路各部の信号波形図である。
２ａ，２ｂ，３ａ，３ｂ……磁気ヘツド、１２
，２２，２５，２６……スイツチ、１３，１４…
…検波器、１５……比較器、２０……切換点パル
ス生成回路、２１……アンド回路、２４……ドロ
ツプアウト検出器、３１，５０……１Ｈ遅延回路
、４２，４４……インバータ、４３……イクスク
ルーシブオア回路、Ｃ１，Ｃ２……コンデンサ、
Ｒ１，Ｒ２……抵抗。
1 and 9 are block system diagrams of each embodiment of the device of the present invention, FIG. 2 is a diagram for explaining the magnetic head used in the device of the present invention, and FIG. 3 is a block diagram of an example of the conventional device. System diagram, FIG. 4 is a diagram for explaining the recorded video track pattern of the tape played back by the device of the present invention and its scanning, and FIGS. 5 and 8 are signal waveform diagrams of each part of the device shown in FIG. 1. , FIG. 6 is a circuit diagram of a part of the apparatus shown in FIG. 1, and FIG. 7 is a signal waveform diagram of each part of the circuit shown in FIG. 2a, 2b, 3a, 3b...magnetic head, 12
, 22, 25, 26... switch, 13, 14...
...Detector, 15...Comparator, 20...Switching point pulse generation circuit, 21...AND circuit, 24...Dropout detector, 31, 50...1H delay circuit, 42, 44...Inverter, 43... ... exclusive OR circuit, C 1 , C 2 ... capacitor,
R 1 , R 2 ...resistance.
Claims (1)
の２個の磁気ヘツドを少なくとも１組設けられて
おり、該２個の磁気ヘツド夫々で記録媒体の既記
録映像トラツクより再生された再生信号夫々を検
波した後比較して切換信号を生成し、該切換信号
に応じて該２個の磁気ヘツドの再生信号のうち再
生レベルの大なる方の再生信号を切換えて取り出
し、かつ取り出された再生信号のドロツプアウト
検出時にドロツプアウトの検出信号を用いて該再
生信号より復調された輝度信号を１Ｈ（Ｈは水平
走査周期）前の輝度信号に置き換えドロツプアウ
ト補償を行なう磁気再生装置において、該切換信
号から再生信号の切換タイミングに対応した切換
点信号を生成してドロツプアウト補償を行なう回
路に供給する切換点信号生成回路を設けてなり、
該切換点信号とドロツプアウトの検出信号とを用
いて該復調された輝度信号を１Ｈ前の輝度信号に
置き換えるよう構成した磁気再生装置。 At least one set of two magnetic heads having opposite azimuths is provided adjacent to each other in the rotational direction of the rotating body, and each of the two magnetic heads receives a reproduction signal reproduced from a recorded video track of a recording medium. After the detection, a switching signal is generated by comparing the signals, and according to the switching signal, the reproduction signal with a higher reproduction level of the reproduction signals of the two magnetic heads is switched and extracted, and the reproduction signal of the extracted reproduction signal is In a magnetic reproducing device that performs dropout compensation by replacing the luminance signal demodulated from the reproduced signal with the luminance signal 1H (H is a horizontal scanning period) earlier using the dropout detection signal when detecting a dropout, the reproduction signal is determined from the switching signal. A switching point signal generation circuit is provided which generates a switching point signal corresponding to the switching timing and supplies it to a circuit that performs dropout compensation,
A magnetic reproducing device configured to use the switching point signal and the dropout detection signal to replace the demodulated luminance signal with a luminance signal from 1H earlier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9877085U JPH0523029Y2 (en) | 1985-06-28 | 1985-06-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9877085U JPH0523029Y2 (en) | 1985-06-28 | 1985-06-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS628775U true JPS628775U (en) | 1987-01-20 |
| JPH0523029Y2 JPH0523029Y2 (en) | 1993-06-14 |
Family
ID=30967035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9877085U Expired - Lifetime JPH0523029Y2 (en) | 1985-06-28 | 1985-06-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0523029Y2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63249906A (en) * | 1987-04-07 | 1988-10-17 | Hitachi Ltd | Head switching circuit |
| JPH02121025U (en) * | 1989-03-17 | 1990-10-01 | ||
| JPH02121024U (en) * | 1989-03-17 | 1990-10-01 |
-
1985
- 1985-06-28 JP JP9877085U patent/JPH0523029Y2/ja not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63249906A (en) * | 1987-04-07 | 1988-10-17 | Hitachi Ltd | Head switching circuit |
| JPH02121025U (en) * | 1989-03-17 | 1990-10-01 | ||
| JPH02121024U (en) * | 1989-03-17 | 1990-10-01 | ||
| JPH0620505Y2 (en) * | 1989-03-17 | 1994-06-01 | 東洋ゴム工業株式会社 | Floor rub prevention mat |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0523029Y2 (en) | 1993-06-14 |
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