JPH0298573U - - Google Patents
Info
- Publication number
- JPH0298573U JPH0298573U JP606489U JP606489U JPH0298573U JP H0298573 U JPH0298573 U JP H0298573U JP 606489 U JP606489 U JP 606489U JP 606489 U JP606489 U JP 606489U JP H0298573 U JPH0298573 U JP H0298573U
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- level
- value
- output
- switch
- 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 8
- 238000010586 diagram Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 2
Landscapes
- Television Signal Processing For Recording (AREA)
Description
第１図は本考案の実施例を示す回路図、第２図
はレベル検出回路例の図、第３図は第１図の各部
に対応する波形を示す図、第４図はＤＯパルス分
離回路の他の例のブロツク図、第５図は第４図の
各部の波形を示す図である。第６図は従来のドロ
ツプアウト検出回路を示すブロツク図で、第７図
は第６図の各部に対応する波形を示す図である。
１……レベル検出回路、１１……エンベロープ
検波器、１２……電圧比較器、２……基準電圧回
路、３……スイツチ回路、４……ＤＯパルス分離
回路、〔ａ〕……ＲＦ信号、〔ｂ〕……レベル検
出回路出力、〔ｃ〕……第２ＤＯパルス、〔ｄ〕
……第１ＤＯパルス。
Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a diagram of an example of a level detection circuit, Fig. 3 is a diagram showing waveforms corresponding to each part of Fig. 1, and Fig. 4 is a DO pulse separation circuit. FIG. 5 is a block diagram of another example of the present invention, and is a diagram showing waveforms at various parts in FIG. FIG. 6 is a block diagram showing a conventional dropout detection circuit, and FIG. 7 is a diagram showing waveforms corresponding to each part of FIG. 6. 1 ... Level detection circuit, 11... Envelope detector, 12... Voltage comparator, 2... Reference voltage circuit, 3... Switch circuit, 4... DO pulse separation circuit, [a]... RF signal, [b]...Level detection circuit output, [c]...Second DO pulse, [d]
...First DO pulse.
Claims (1)
プ検波器と、該エンベロープ検波器の出力を基準
電圧と比較する電圧比較器とを有するレベル検出
回路を有し、 前記基準電圧を第１の値と第２の値とに切換え
るスイツチ回路を有し、 該スイツチ回路は、前記レベル検出回路の出力
レベルの高低に応じて該出力レベルが反転する側
へ前記第１の値と第２の値とを切換えるように配
されることを特徴とするドロツプアウト検出回路
。[Claims for Utility Model Registration] A level detection circuit having an envelope detector that detects the envelope of an input signal and a voltage comparator that compares the output of the envelope detector with a reference voltage; 1 and a second value, and the switch circuit switches the first value and the second value to the side where the output level is inverted depending on the level of the output level of the level detection circuit. A dropout detection circuit characterized in that the dropout detection circuit is arranged to switch between the values of .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP606489U JPH0298573U (en) | 1989-01-24 | 1989-01-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP606489U JPH0298573U (en) | 1989-01-24 | 1989-01-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0298573U true JPH0298573U (en) | 1990-08-06 |
Family
ID=31209981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP606489U Pending JPH0298573U (en) | 1989-01-24 | 1989-01-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0298573U (en) |
-
1989
- 1989-01-24 JP JP606489U patent/JPH0298573U/ja active Pending