JPH0339918U - - Google Patents
Info
- Publication number
- JPH0339918U JPH0339918U JP10163789U JP10163789U JPH0339918U JP H0339918 U JPH0339918 U JP H0339918U JP 10163789 U JP10163789 U JP 10163789U JP 10163789 U JP10163789 U JP 10163789U JP H0339918 U JPH0339918 U JP H0339918U
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- circuit
- supplied
- intermediate frequency
- signal
- 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 13
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000010363 phase shift Effects 0.000 description 1
Description
第１図は本考案の中間周波検波回路の一実施例
を示すブロツク図、第２図は具体例を示す図、第
３図Ａ，Ｂは第２図における各部の波形を示すグ
ラフ、第４図Ａ，Ｂは低域フイルタの一実施例を
示す回路図、第４図Ｃは第４図Ａ，Ｂに示した低
域フイルタの応答特性を示すグラフ、第５図及び
第６図は従来例を示すブロツク図である。
１，１３…端子、２…信号レベル検出回路、３
…自動利得調整回路（ＡＧＣ回路）、４…９０°
位相シフト回路、５…位相比較器、６…低域フイ
ルタ、７…直流増幅器、８…電圧制御発振器（Ｖ
ＣＯ）、９…同期検波回路、１０…ロツク検出回
路、１１，１４…時定数切換回路、１２…ＰＬＬ
、１５…外部コントロールスイツチ、ＳＷ…スイ
ツチ。
FIG. 1 is a block diagram showing one embodiment of the intermediate frequency detection circuit of the present invention, FIG. 2 is a diagram showing a specific example, FIGS. 3A and B are graphs showing waveforms of various parts in FIG. Figures A and B are circuit diagrams showing one embodiment of the low-pass filter, Figure 4C is a graph showing the response characteristics of the low-pass filter shown in Figures 4A and B, and Figures 5 and 6 are conventional FIG. 2 is a block diagram showing an example. 1, 13...Terminal, 2...Signal level detection circuit, 3
...Automatic gain adjustment circuit (AGC circuit), 4...90°
Phase shift circuit, 5... Phase comparator, 6... Low-pass filter, 7... DC amplifier, 8... Voltage controlled oscillator (V
CO), 9... Synchronous detection circuit, 10... Lock detection circuit, 11, 14... Time constant switching circuit, 12... PLL
, 15...external control switch, SW...switch.
Claims (1)
レベル検出を行う信号レベル検出回路と、 前記中間周波信号が供給され、この信号レベル
検出回路の出力によりこの中間周波信号の利得を
調整する自動利得調整回路と、 この自動利得調整回路の出力が供給され、位相
をロツクするフエーズ・ロツクト・ループと、 前記自動利得調整回路の出力とこのフエーズ・
ロツクト・ループの出力とが供給され、中間周波
検波出力信号を出力する同期検波回路と、 この同期検波回路の出力信号が供給され、この
フエーズ・ロツクト・ループのロツク状態を検出
するロツク検出回路と、 このロツク検出回路の出力信号により前記フエ
ーズ・ロツクト・ループの時定数を切り換える時
定数切換回路とよりなる中間周波検出回路におい
て、 前記信号レベル検出回路の出力を前記時定数回
路に供給し、中間周波信号のレベルに応じて前記
フエーズ・ロツクト・ループの時定数を可変する
ことを特徴とする中間周波検波回路。[Claims for Utility Model Registration] A signal level detection circuit to which an intermediate frequency signal is supplied and which detects the level of this intermediate frequency signal; an automatic gain adjustment circuit that adjusts the gain of the automatic gain adjustment circuit; a phase lock loop that is supplied with the output of the automatic gain adjustment circuit and locks the phase;
A synchronous detection circuit is supplied with the output of the lock loop and outputs an intermediate frequency detection output signal, and a lock detection circuit is supplied with the output signal of the synchronous detection circuit and detects the lock state of the phase lock loop. , an intermediate frequency detection circuit comprising a time constant switching circuit that switches the time constant of the phase lock loop according to the output signal of the lock detection circuit, the output of the signal level detection circuit being supplied to the time constant circuit; An intermediate frequency detection circuit characterized in that the time constant of the phase locked loop is varied according to the level of a frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10163789U JPH0339918U (en) | 1989-08-30 | 1989-08-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10163789U JPH0339918U (en) | 1989-08-30 | 1989-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0339918U true JPH0339918U (en) | 1991-04-17 |
Family
ID=31650581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10163789U Pending JPH0339918U (en) | 1989-08-30 | 1989-08-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0339918U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005263256A (en) * | 2004-03-18 | 2005-09-29 | Hosokawa Yoko Co Ltd | Goods storage bag |
-
1989
- 1989-08-30 JP JP10163789U patent/JPH0339918U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005263256A (en) * | 2004-03-18 | 2005-09-29 | Hosokawa Yoko Co Ltd | Goods storage bag |
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