JPS6421586U - - Google Patents
Info
- Publication number
- JPS6421586U JPS6421586U JP11547487U JP11547487U JPS6421586U JP S6421586 U JPS6421586 U JP S6421586U JP 11547487 U JP11547487 U JP 11547487U JP 11547487 U JP11547487 U JP 11547487U JP S6421586 U JPS6421586 U JP S6421586U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- circuit
- color
- detection circuit
- burst
- 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 5
- 230000004913 activation Effects 0.000 claims 1
- 230000010355 oscillation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Processing Of Color Television Signals (AREA)
Description
第１図は、本考案の一実施例に基づくブロツク
図、第２図は第１図中のブロツク図中、バースト
立ち上がり検出回路、ゲート信号発生回路の一実
施例の回路図、第３図は第２図の回路の各部波形
図である。
１……サブキヤリア周波数、位相にもとづく基
準クロツク、２……水平同期信号、３……位相比
較器、４……ループフイルタ、５……ＶＣＯ、６
……分周カウンタ、７……バースト立ち上がり検
出回路、８……分周カウンタ起動制御回路、９…
…水平同期信号の不連続性検出回路、１０……ゲ
ート信号発生回路、１１……分周カウンタ位相制
御信号、１２……バースト立ち上がり検出用ゲー
ト信号、１３……水平周期信号、１４……入力バ
ースト信号（二値化したもの）、１５……パルス
幅可変用可変抵抗器及びコンデンサ、１６……単
安定マルチバイブレータ、１７……遅延素子、１
８……Ｄフリツプフロツプ。
FIG. 1 is a block diagram based on one embodiment of the present invention, FIG. 2 is a circuit diagram of one embodiment of the burst rise detection circuit and gate signal generation circuit in the block diagram in FIG. 1, and FIG. 3 is a waveform diagram of each part of the circuit of FIG. 2. FIG. 1...Reference clock based on subcarrier frequency and phase, 2...Horizontal synchronization signal, 3...Phase comparator, 4...Loop filter, 5...VCO, 6
...Division counter, 7...Burst rise detection circuit, 8...Divide counter start control circuit, 9...
... Horizontal synchronization signal discontinuity detection circuit, 10 ... Gate signal generation circuit, 11 ... Frequency division counter phase control signal, 12 ... Gate signal for burst rising edge detection, 13 ... Horizontal periodic signal, 14 ... Input Burst signal (binarized), 15... Variable resistor and capacitor for variable pulse width, 16... Monostable multivibrator, 17... Delay element, 1
8...D flipflop.
Claims (1)
ースト周波数にロツクするためのＰＬＬ回路に、
単安定マルチバイブレータ遅延素子を主要回路素
子とするカラーバースト立ち上がり検出回路付加
し、バーストの立ち上がり信号により分周カウン
タの起動を制御するように構成することを特徴と
する色副搬送波発振回路。 In the PLL circuit for locking the frequency multiplied by the subcarrier frequency to the color burst frequency,
1. A color subcarrier oscillation circuit comprising: a color burst rise detection circuit having a monostable multivibrator delay element as a main circuit element; and a color burst rise detection circuit configured to control activation of a frequency division counter by a burst rise signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11547487U JPS6421586U (en) | 1987-07-27 | 1987-07-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11547487U JPS6421586U (en) | 1987-07-27 | 1987-07-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6421586U true JPS6421586U (en) | 1989-02-02 |
Family
ID=31357165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11547487U Pending JPS6421586U (en) | 1987-07-27 | 1987-07-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6421586U (en) |
-
1987
- 1987-07-27 JP JP11547487U patent/JPS6421586U/ja active Pending
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