JPH02134781U - - Google Patents
Info
- Publication number
- JPH02134781U JPH02134781U JP1989044751U JP4475189U JPH02134781U JP H02134781 U JPH02134781 U JP H02134781U JP 1989044751 U JP1989044751 U JP 1989044751U JP 4475189 U JP4475189 U JP 4475189U JP H02134781 U JPH02134781 U JP H02134781U
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- video
- output
- filter
- controlled oscillator
- 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 9
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 1
- 230000001360 synchronised effect 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図、第２図は
要部具体回路を示す図である。
３…映像検波回路、４…ＶＣＯ、６…位相検波
器、７…フイルタ、９…乗算器、１１…ロツク検
出回路、１２…ミユーテイング信号発生回路。
FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a main part specific circuit. 3... Video detection circuit, 4... VCO, 6... Phase detector, 7... Filter, 9... Multiplier, 11... Lock detection circuit, 12... Muting signal generation circuit.
Claims (1)
振出力と映像中間周波数信号とを位相検波する位
相検波器及びこの位相検波器の出力を前記電圧制
御発振器に供給するためのフイルタよりなる完全
同期検波方式の映像検波回路と、この映像検波回
路の出力に基づき前記映像検波回路のロツク状態
を検出し、アンロツク時に前記フイルタの時定数
を切換える信号を出力するロツク検出回路と、こ
のロツク検出回路の出力に応答し、前記フイルタ
の時定数が切換えられるとき、ミユーテイング信
号を発生するミユーテイング信号発生回路とを具
備したことを特徴とする映像機器のミユーテイン
グ回路。 A fully synchronous detection system comprising a voltage controlled oscillator, a phase detector for phase detecting the oscillation output from the voltage controlled oscillator and the video intermediate frequency signal, and a filter for supplying the output of the phase detector to the voltage controlled oscillator. a video detection circuit; a lock detection circuit that detects the locked state of the video detection circuit based on the output of the video detection circuit and outputs a signal for switching the time constant of the filter when unlocked; and a lock detection circuit that responds to the output of the lock detection circuit. A muting circuit for video equipment, comprising: a muting signal generation circuit that generates a muting signal when the time constant of the filter is switched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989044751U JPH02134781U (en) | 1989-04-17 | 1989-04-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989044751U JPH02134781U (en) | 1989-04-17 | 1989-04-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02134781U true JPH02134781U (en) | 1990-11-08 |
Family
ID=31558325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989044751U Pending JPH02134781U (en) | 1989-04-17 | 1989-04-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02134781U (en) |
-
1989
- 1989-04-17 JP JP1989044751U patent/JPH02134781U/ja active Pending