JPH0174672U - - Google Patents
Info
- Publication number
- JPH0174672U JPH0174672U JP1988151763U JP15176388U JPH0174672U JP H0174672 U JPH0174672 U JP H0174672U JP 1988151763 U JP1988151763 U JP 1988151763U JP 15176388 U JP15176388 U JP 15176388U JP H0174672 U JPH0174672 U JP H0174672U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- generates
- oscillator
- modulator
- 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
Landscapes
- Synchronizing For Television (AREA)
- Processing Of Color Television Signals (AREA)
Description
第１図は従来のＰＡＬ同期信号発生装置を示す
回路構成図、第２図は考案によるＰＡＬ同期信号
発生装置の一実施例を示す回路構成図である。
２０……電圧制御発信器、２４……信号発生器
、２６……基準発振器、２８……第１の変調器、
３０……分周回路、３２……比較器。
FIG. 1 is a circuit configuration diagram showing a conventional PAL synchronization signal generation device, and FIG. 2 is a circuit configuration diagram showing an embodiment of the PAL synchronization signal generation device according to the invention. 20... Voltage control oscillator, 24... Signal generator, 26... Reference oscillator, 28... First modulator,
30... Frequency dividing circuit, 32... Comparator.
Claims (1)
有する第１の信号を発生する電圧制御発振器と、
この発振器からの信号が導入され、この信号を分
周し、垂直走査周波数ｆＶを有する第２の信号及
び水平走査周波数の１／２の周波数１／２ｆＨを
有する第３の信号を発生する信号発生器と、副搬
送波周波数ｆＳＣの２倍の周波数（２ｆＳＣ＝２
×２８４ｆＨ―１／２ｆＨ＋ｆｖ）を有する第４
の信号を発生する基準発振器と、この基準発振器
からの第４の信号を前記第２の信号で変調し、前
記第１および第３の信号成分の周波数（２×２８
４ｆＨ―１／２ｆＨ）を有する第５の信号を導出
する変調器と、この変調器から第５の信号を１１
３５分の１分周し、前記第３の信号と同じ周波数
を有する信号を発生する分周回路と、この分周回
路からの信号及び前記第３の信号とを周波数比較
し差成分を導出する比較器と、この比較器の出力
によつて前記電圧制御発振器の第１の信号周波数
を制御する手段とを具備するＰＡＬ同期信号発生
装置。 a voltage controlled oscillator that generates a first signal having a frequency 2×284 times the horizontal scanning frequency fH;
A signal generation device in which a signal from this oscillator is introduced and divides this signal to generate a second signal having a vertical scanning frequency fV and a third signal having a frequency 1/2fH, which is 1/2 the horizontal scanning frequency. with a frequency twice the subcarrier frequency fSC (2fSC=2
×284fH−1/2fH+fv)
a reference oscillator that generates a signal; a fourth signal from the reference oscillator is modulated by the second signal, and the frequencies of the first and third signal components (2×28
4fH - 1/2fH) and a modulator for deriving a fifth signal from this modulator with a
A frequency dividing circuit that divides the frequency by 1/35 and generates a signal having the same frequency as the third signal, and compares the frequency of the signal from this frequency dividing circuit and the third signal to derive a difference component. A PAL synchronization signal generator comprising a comparator and means for controlling a first signal frequency of the voltage controlled oscillator by the output of the comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988151763U JPH0174672U (en) | 1988-11-24 | 1988-11-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988151763U JPH0174672U (en) | 1988-11-24 | 1988-11-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0174672U true JPH0174672U (en) | 1989-05-19 |
Family
ID=31426097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988151763U Pending JPH0174672U (en) | 1988-11-24 | 1988-11-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0174672U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5312229A (en) * | 1976-07-21 | 1978-02-03 | Toshiba Corp | Pal synchronous signal generator |
-
1988
- 1988-11-24 JP JP1988151763U patent/JPH0174672U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5312229A (en) * | 1976-07-21 | 1978-02-03 | Toshiba Corp | Pal synchronous signal generator |
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