JPS63111035U - - Google Patents
Info
- Publication number
- JPS63111035U JPS63111035U JP149987U JP149987U JPS63111035U JP S63111035 U JPS63111035 U JP S63111035U JP 149987 U JP149987 U JP 149987U JP 149987 U JP149987 U JP 149987U JP S63111035 U JPS63111035 U JP S63111035U
- Authority
- JP
- Japan
- Prior art keywords
- external control
- control signal
- level
- amplifier
- attenuation
- 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.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
第１図は本考案の一実施例のブロツク図、第２
図は第１図におけるコンパレータ７の動作を説明
するための図、第３図は本考案の実施例の動作を
説明するためのＳ／Ｎ特性図、第４図は従来のＡ
ＧＣループのブロツク図、第５図は第４図の動作
を説明するためのＳ／Ｎ特性図。
図中、２……ＡＧＣ増幅器、３……プログラマ
ブル減衰器、４……レベル検出器、５……ＡＧＣ
ループフイルタ、６……直流増幅器、７……コン
パレータ、８……レベル変換器、９……復調器。
Fig. 1 is a block diagram of an embodiment of the present invention;
The figure is a diagram for explaining the operation of the comparator 7 in Figure 1, Figure 3 is an S/N characteristic diagram for explaining the operation of the embodiment of the present invention, and Figure 4 is a diagram for explaining the operation of the comparator 7 in Figure 1.
5 is a block diagram of the GC loop, and FIG. 5 is an S/N characteristic diagram for explaining the operation of FIG. 4. In the figure, 2...AGC amplifier, 3...Programmable attenuator, 4...Level detector, 5...AGC
Loop filter, 6... DC amplifier, 7... Comparator, 8... Level converter, 9... Demodulator.
Claims (1)
Ｃ増幅器と、レベル検出器と、ループフイルタ及
び直流増幅器とを含むＡＧＣループにおいて、利
得又は減衰量が外部制御信号によつて決定される
プログラマブル減衰器と、ＡＧＣ電圧をあらかじ
め定められた基準電圧と比較する手段と、該比較
手段の出力信号を前記外部制御信号に変換するレ
ベル変換器とを付加したことを特徴とする自動Ｓ
／Ｎ改善回路。 AG that suppresses input signal level changes to a constant level
In an AGC loop including a C amplifier, a level detector, a loop filter, and a DC amplifier, a programmable attenuator whose gain or attenuation is determined by an external control signal, and a programmable attenuator whose gain or attenuation is determined by an external control signal; An automatic S characterized in that it further comprises a comparing means and a level converter for converting the output signal of the comparing means into the external control signal.
/N improvement circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987001499U JPH0528837Y2 (en) | 1987-01-10 | 1987-01-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987001499U JPH0528837Y2 (en) | 1987-01-10 | 1987-01-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63111035U true JPS63111035U (en) | 1988-07-16 |
| JPH0528837Y2 JPH0528837Y2 (en) | 1993-07-23 |
Family
ID=30779462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987001499U Expired - Lifetime JPH0528837Y2 (en) | 1987-01-10 | 1987-01-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0528837Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998010514A1 (en) * | 1996-09-05 | 1998-03-12 | Mitsubishi Denki Kabushiki Kaisha | Gain controlling method and receiver |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6091730A (en) * | 1983-10-26 | 1985-05-23 | Matsushita Electric Ind Co Ltd | Radio receiver |
-
1987
- 1987-01-10 JP JP1987001499U patent/JPH0528837Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6091730A (en) * | 1983-10-26 | 1985-05-23 | Matsushita Electric Ind Co Ltd | Radio receiver |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998010514A1 (en) * | 1996-09-05 | 1998-03-12 | Mitsubishi Denki Kabushiki Kaisha | Gain controlling method and receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0528837Y2 (en) | 1993-07-23 |