JPS62105678U - - Google Patents
Info
- Publication number
- JPS62105678U JPS62105678U JP19722585U JP19722585U JPS62105678U JP S62105678 U JPS62105678 U JP S62105678U JP 19722585 U JP19722585 U JP 19722585U JP 19722585 U JP19722585 U JP 19722585U JP S62105678 U JPS62105678 U JP S62105678U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- color
- oscillation
- outputs
- 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
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 7
- 239000002131 composite material Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Description
第１図ないし第３図はこの考案の色信号処理回
路の実施例を示し、第１図は１実施例のブロツク
図、第２図は他の実施例のブロツク図、第３図は
さらに他の実施例の一部のブロツク図、第４図は
従来の色信号処理回路のブロツク図である。
１……主周波数変換回路、７……第１制御発振
器、１０……第２制御発振器、１３……副周波数
変換回路、１４……欠落検出回路、１５……切換
スイツチ、１６……基準信号発生回路、１７……
同期検出回路、１８……ゲート回路。
1 to 3 show embodiments of the color signal processing circuit of this invention. FIG. 1 is a block diagram of one embodiment, FIG. 2 is a block diagram of another embodiment, and FIG. 3 is a block diagram of another embodiment. FIG. 4 is a block diagram of a conventional color signal processing circuit. DESCRIPTION OF SYMBOLS 1... Main frequency conversion circuit, 7... First controlled oscillator, 10... Second controlled oscillator, 13... Sub frequency conversion circuit, 14... Missing detection circuit, 15... Changeover switch, 16... Reference signal Generation circuit, 17...
Synchronization detection circuit, 18...gate circuit.
Claims (1)
れた低域変換出信号を周波数変換し、元の周波数
の再生色信号を出力する主周波数変換回路と、前
記再生色信号のカラーバースト期間の位相変動に
もとづく位相制御用の誤差信号によつて発振制御
され、前記再生色信号の搬送周波数を中心周波数
とする第１発振信号を出力する第１制御発振器と
、前記再生信号に含まれた水平同期信号の位相変
動にもとづく周波数制御用の誤差信号によつて発
振制御され、前記再生低域変換色信号の搬送周波
数に比例して変化する第２発振信号を出力する第
２制御発振器と、前記第１発振信号と前記第２発
振信号の分周信号との合成周波数の変換用周波数
信号を形成し、該周波数信号を前記主周波数変換
回路に出力する副周波数変換回路とを備えた色信
号処理回路において、前記第１発振信号をほぼ前
記再生色信号の搬送周波数に固定する位相制御基
準信号を出力する基準信号発生回路と、少なくと
も前記再生信号のカラーバースト期間の水平同期
信号期間の欠落を検出する欠落検出手段と、前記
欠落検出手段の出力信号にもとづき前記欠落の非
検出時に前記位相制御用の誤差信号を前記第１制
御発振器に供給し前記欠落の検出時に前記位相制
御基準信号を前記第１制御発振器に供給する切換
手段とを備えた色信号処理回路。 A main frequency conversion circuit that converts the frequency of a low-frequency conversion output signal included in a playback signal of a recording medium such as a video tape and outputs a playback color signal at the original frequency, and a phase variation in the color burst period of the playback color signal. a first control oscillator that outputs a first oscillation signal whose center frequency is the carrier frequency of the reproduced color signal, whose oscillation is controlled by an error signal for phase control based on the reproduction signal; and a horizontal synchronization signal included in the reproduction signal. a second controlled oscillator that outputs a second oscillation signal whose oscillation is controlled by an error signal for frequency control based on a phase variation of the reproduced low-pass conversion color signal, and which changes in proportion to the carrier frequency of the reproduced low-pass conversion color signal; A color signal processing circuit comprising: a sub frequency conversion circuit that forms a conversion frequency signal of a composite frequency of an oscillation signal and a frequency-divided signal of the second oscillation signal, and outputs the frequency signal to the main frequency conversion circuit. , a reference signal generation circuit that outputs a phase control reference signal that fixes the first oscillation signal approximately to the carrier frequency of the reproduced color signal; and a lack that detects at least a lack of a horizontal synchronizing signal period in a color burst period of the reproduced signal. a detection means, based on the output signal of the omission detection means, supplies the error signal for phase control to the first control oscillator when the omission is not detected, and controls the phase control reference signal to the first control oscillator when the omission is detected; A color signal processing circuit comprising switching means for supplying the signal to the oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19722585U JPS62105678U (en) | 1985-12-20 | 1985-12-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19722585U JPS62105678U (en) | 1985-12-20 | 1985-12-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62105678U true JPS62105678U (en) | 1987-07-06 |
Family
ID=31156755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19722585U Pending JPS62105678U (en) | 1985-12-20 | 1985-12-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62105678U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6449394A (en) * | 1987-08-19 | 1989-02-23 | Sanyo Electric Co | Chrominance signal processing circuit |
-
1985
- 1985-12-20 JP JP19722585U patent/JPS62105678U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6449394A (en) * | 1987-08-19 | 1989-02-23 | Sanyo Electric Co | Chrominance signal processing circuit |
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