JPS6230430U - - Google Patents
Info
- Publication number
- JPS6230430U JPS6230430U JP12025986U JP12025986U JPS6230430U JP S6230430 U JPS6230430 U JP S6230430U JP 12025986 U JP12025986 U JP 12025986U JP 12025986 U JP12025986 U JP 12025986U JP S6230430 U JPS6230430 U JP S6230430U
- Authority
- JP
- Japan
- Prior art keywords
- frequency band
- level
- band pass
- received signal
- pass filter
- 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 description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Noise Elimination (AREA)
Description
第１図は本考案の超高周波帯のＦＭ受信機のＳ
Ｎ比改善装置の一実施例のブロツク図を、第２図
ａ及びｂは同上の要部の実施例の回路図をそれぞ
れ示す。
４：帯域通過フイルター（ＢＰＦ）、５：スイ
ツチング回路、６：第２ＩＦＡｍｐ、７：ＩＦレ
ベル検波、９：ＤＣレベル検出、１０５及び１０
６：ダイオード、ＳＷ：スイツチ手段。
Figure 1 shows the S of the ultra-high frequency band FM receiver of the present invention.
A block diagram of an embodiment of the N-ratio improvement device is shown, and FIGS. 2a and 2b are circuit diagrams of the embodiment of the same essential parts. 4: Band pass filter (BPF), 5: Switching circuit, 6: 2nd IFAmp, 7: IF level detection, 9: DC level detection, 105 and 10
6: Diode, SW: Switch means.
Claims (1)
帯における帯域通過フイルターとして広帯域通過
フイルターと狭帯域通過フイルターを設け、且つ
受信信号のレベルが所定のレベル以上の時に広帯
域通過フイルターを選択し、所定のレベル以下の
時に狭帯域通過フイルターを選択する選択回路を
設けてなり、受信信号の減衰が所定レベルに達し
たときに中間周波帯における帯域通過フイルター
の帯域巾を圧縮してスレシホールドレベルを低下
させることによりＳ／Ｎを大にしうるようにした
ことを特徴とする超高周波帯のＦＭ受信機のＳＮ
比改善装置。 In an ultra-high frequency band FM receiver, a wide band pass filter and a narrow band pass filter are provided as band pass filters in the intermediate frequency band, and when the level of the received signal is above a predetermined level, the wide band pass filter is selected, and when the level of the received signal is higher than a predetermined level, A selection circuit is provided to select a narrow bandpass filter in the following cases, and when the attenuation of the received signal reaches a predetermined level, the bandwidth of the bandpass filter in the intermediate frequency band is compressed to lower the threshold level. The SN of an FM receiver in an ultra-high frequency band, which is characterized by being able to increase the S/N by
Ratio improvement device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12025986U JPS6230430U (en) | 1986-08-04 | 1986-08-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12025986U JPS6230430U (en) | 1986-08-04 | 1986-08-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6230430U true JPS6230430U (en) | 1987-02-24 |
Family
ID=31008408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12025986U Pending JPS6230430U (en) | 1986-08-04 | 1986-08-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6230430U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5374816A (en) * | 1976-12-15 | 1978-07-03 | Nec Corp | Receiver |
-
1986
- 1986-08-04 JP JP12025986U patent/JPS6230430U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5374816A (en) * | 1976-12-15 | 1978-07-03 | Nec Corp | Receiver |
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