JPH0476781U - - Google Patents
Info
- Publication number
- JPH0476781U JPH0476781U JP11938990U JP11938990U JPH0476781U JP H0476781 U JPH0476781 U JP H0476781U JP 11938990 U JP11938990 U JP 11938990U JP 11938990 U JP11938990 U JP 11938990U JP H0476781 U JPH0476781 U JP H0476781U
- Authority
- JP
- Japan
- Prior art keywords
- pll
- detection circuit
- wave
- synchronous detection
- carrier wave
- 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 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 1
Description
第１図は、本考案の一実施例のＰＬＬ同期検波
回路のブロツク図を示す。
符号の説明、１……振幅復調用検波器、２……
位相器、３……ＶＣＯ、４……ＬＰＦ（切換え回
路を含む）、５……ＢＰＦ、６……周波数復調用
検波器、７……入力信号、８……復調出力。
FIG. 1 shows a block diagram of a PLL synchronous detection circuit according to an embodiment of the present invention. Explanation of symbols, 1... Amplitude demodulation detector, 2...
Phase shifter, 3... VCO, 4... LPF (including switching circuit), 5... BPF, 6... Frequency demodulation detector, 7... Input signal, 8... Demodulation output.
Claims (1)
波回路において、 ＰＬＬループフイルタの時定数を切換える手段
と、映像変調波より搬送波を抜き取る手段と、こ
の搬送波の周波数変動量を検波する手段とを備え
、これにより前期ＰＬＬループフイルタの時定数
を切換えることを特徴とする、ＰＬＬ同期検波回
路。[Claim for Utility Model Registration] In a PLL type AM synchronous detection circuit of a television receiver, a means for switching the time constant of a PLL loop filter, a means for extracting a carrier wave from a video modulated wave, and a means for extracting a carrier wave from a video modulated wave, and a means for detecting a frequency fluctuation amount of this carrier wave. What is claimed is: 1. A PLL synchronous detection circuit, characterized in that the PLL synchronous detection circuit comprises means for detecting a wave, thereby switching a time constant of a first-stage PLL loop filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11938990U JPH0476781U (en) | 1990-11-16 | 1990-11-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11938990U JPH0476781U (en) | 1990-11-16 | 1990-11-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0476781U true JPH0476781U (en) | 1992-07-03 |
Family
ID=31867349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11938990U Pending JPH0476781U (en) | 1990-11-16 | 1990-11-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0476781U (en) |
-
1990
- 1990-11-16 JP JP11938990U patent/JPH0476781U/ja active Pending
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