JPH0181041U - - Google Patents
Info
- Publication number
- JPH0181041U JPH0181041U JP1987175760U JP17576087U JPH0181041U JP H0181041 U JPH0181041 U JP H0181041U JP 1987175760 U JP1987175760 U JP 1987175760U JP 17576087 U JP17576087 U JP 17576087U JP H0181041 U JPH0181041 U JP H0181041U
- Authority
- JP
- Japan
- Prior art keywords
- level
- received input
- expander
- predetermined level
- stage
- 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
- 238000001514 detection method Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 9
- 230000005684 electric field Effects 0.000 description 1
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Noise Elimination (AREA)
Description
第１図は本考案のＦＭ無線受信機の一実施例を
示す構成図、第２図は従来のＦＭ無線受信機の一
例を示す構成図、第３図は従来のＦＭ無線受信機
の他の例を示す構成図、第４図ａ，ｂは圧縮器を
備えたＦＭ無線送信機及び伸張器を備えたＦＭ無
線受信機を示す構成図、第５図は伸張器の一例を
示す回路図、第６図は受信入力レベルと出力レベ
ルとの関係図、第７図は雑音低減効果の測定のよ
うすを示す図、第８図ａ，ｂは第７図の装置によ
る雑音信号の出力波形図である。
５０…電界検出回路、５１…比較器、５４…切
替回路、５５…伸張器。
Fig. 1 is a block diagram showing an embodiment of the FM radio receiver of the present invention, Fig. 2 is a block diagram showing an example of a conventional FM radio receiver, and Fig. 3 is a block diagram showing an example of a conventional FM radio receiver. A configuration diagram showing an example; FIGS. 4a and 4b are configuration diagrams showing an FM radio transmitter equipped with a compressor and an FM radio receiver equipped with an expander; FIG. 5 is a circuit diagram showing an example of an expander; Figure 6 is a diagram showing the relationship between the received input level and output level, Figure 7 is a diagram showing how the noise reduction effect is measured, and Figures 8a and b are output waveform diagrams of the noise signal by the device in Figure 7. be. 50... Electric field detection circuit, 51... Comparator, 54... Switching circuit, 55... Expander.
Claims (1)
を比較する比較器と、 検波後の信号を伸張する伸張器と、 前記比較結果に基づいて受信入力レベルが所定
のレベル以下の時は検波段と音声周波増幅段との
間に前記伸張器を挿入し、所定のレベルより大き
い時は検波段と音声周波増幅段とを直結する切替
回路とを備えた ことを特徴とするＦＭ無線受信機。[Claims for Utility Model Registration] A level detection circuit that detects a received input level; a comparator that compares the detected received input level with a predetermined level; an expander that expands the detected signal; and the comparison. Based on the results, when the received input level is below a predetermined level, the expander is inserted between the detection stage and the audio frequency amplification stage, and when it is higher than the predetermined level, the detection stage and the audio frequency amplification stage are directly connected. An FM radio receiver comprising a switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17576087U JPH0528834Y2 (en) | 1987-11-19 | 1987-11-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17576087U JPH0528834Y2 (en) | 1987-11-19 | 1987-11-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0181041U true JPH0181041U (en) | 1989-05-31 |
| JPH0528834Y2 JPH0528834Y2 (en) | 1993-07-23 |
Family
ID=31467541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17576087U Expired - Lifetime JPH0528834Y2 (en) | 1987-11-19 | 1987-11-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0528834Y2 (en) |
-
1987
- 1987-11-19 JP JP17576087U patent/JPH0528834Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0528834Y2 (en) | 1993-07-23 |
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