JPS63102373U - - Google Patents
Info
- Publication number
- JPS63102373U JPS63102373U JP19643486U JP19643486U JPS63102373U JP S63102373 U JPS63102373 U JP S63102373U JP 19643486 U JP19643486 U JP 19643486U JP 19643486 U JP19643486 U JP 19643486U JP S63102373 U JPS63102373 U JP S63102373U
- Authority
- JP
- Japan
- Prior art keywords
- video
- tuning
- circuit
- signal
- detuning
- 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
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は、本考案の一実施例を示す回路図、第
２図は従来のビデオ同期検波回路を示す回路図、
及び第３図は第１図の説明に供する為の波形図で
ある。
３…ビデオ検波器、４…位相比較器、５…ロー
パスフイルタ、６…ＶＣＯ、２４…ＩＦＡＧＣ回
路、２３…第１差動増幅回路、２５…第２差動増
幅回路。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing a conventional video synchronous detection circuit,
and FIG. 3 are waveform diagrams for explaining FIG. 1. 3... Video detector, 4... Phase comparator, 5... Low pass filter, 6... VCO, 24... IFAGC circuit, 23... First differential amplifier circuit, 25... Second differential amplifier circuit.
Claims (1)
ら成るＰＬＬ回路の出力信号を用いて、ビデオＩ
Ｆ信号を同期検波するビデオ同期検波回路におい
て、検波されたビデオ信号のレベルを検出し、前
記ローパスフイルタの時定数を離調時に大、同期
時に小となる様に切換える同調・離調判別回路と
、受信信号の電界強度を検出し、同調時で弱電界
のとき前記ローパスフイルタの時定数が大となる
様に前記同調・離調判別回路の動作を制御する制
御回路とを備えることを特徴とするビデオ同期検
波回路。 Video I
In a video synchronous detection circuit for synchronously detecting an F signal, a tuning/detuning discrimination circuit detects the level of the detected video signal and switches the time constant of the low-pass filter so that it becomes large when detuned and small when synchronized. and a control circuit that detects the electric field strength of the received signal and controls the operation of the tuning/detuning discrimination circuit so that the time constant of the low-pass filter becomes large when the electric field is weak during tuning. video synchronous detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986196434U JPH0756544Y2 (en) | 1986-12-19 | 1986-12-19 | Video synchronous detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986196434U JPH0756544Y2 (en) | 1986-12-19 | 1986-12-19 | Video synchronous detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63102373U true JPS63102373U (en) | 1988-07-04 |
| JPH0756544Y2 JPH0756544Y2 (en) | 1995-12-25 |
Family
ID=31155250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986196434U Expired - Lifetime JPH0756544Y2 (en) | 1986-12-19 | 1986-12-19 | Video synchronous detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0756544Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0344280A (en) * | 1989-07-12 | 1991-02-26 | Mitsubishi Electric Corp | Video intermediate frequency signal processing circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5880903A (en) * | 1981-11-09 | 1983-05-16 | Matsushita Electric Ind Co Ltd | Television signal processor |
| JPS5896404A (en) * | 1981-12-04 | 1983-06-08 | Hitachi Ltd | Synchronous detection circuit |
| JPS5896406A (en) * | 1981-12-03 | 1983-06-08 | Matsushita Electric Ind Co Ltd | Bias circuit |
-
1986
- 1986-12-19 JP JP1986196434U patent/JPH0756544Y2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5880903A (en) * | 1981-11-09 | 1983-05-16 | Matsushita Electric Ind Co Ltd | Television signal processor |
| JPS5896406A (en) * | 1981-12-03 | 1983-06-08 | Matsushita Electric Ind Co Ltd | Bias circuit |
| JPS5896404A (en) * | 1981-12-04 | 1983-06-08 | Hitachi Ltd | Synchronous detection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0344280A (en) * | 1989-07-12 | 1991-02-26 | Mitsubishi Electric Corp | Video intermediate frequency signal processing circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0756544Y2 (en) | 1995-12-25 |
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