JPS633636U - - Google Patents
Info
- Publication number
- JPS633636U JPS633636U JP1986094626U JP9462686U JPS633636U JP S633636 U JPS633636 U JP S633636U JP 1986094626 U JP1986094626 U JP 1986094626U JP 9462686 U JP9462686 U JP 9462686U JP S633636 U JPS633636 U JP S633636U
- Authority
- JP
- Japan
- Prior art keywords
- detection
- output
- input
- amplifier
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 5
Description
第１図は本考案に係るＦＭ受信機の入力レベル
検出装置の一実施例を示すブロツク図、第２図は
従来のＦＭ受信機の入力レベル検出装置を示すブ
ロツク図、第３図は本考案で用いるハイパスフイ
ルタの回路図、第４図、第５図は本考案の説明に
供するための特性図である。
ＩＮ：ローノイズブロツクダウンコンバータ（
図示せず）からの出力が入力される入力端子、１
１：第１ＩＦ段、１２：ミキサー、１３：局部発
振器、１４：第２ＩＦ段、１５：ＦＭ検波器、１
６：ＡＭ検波器、１７：３．５８ＭＨｚ×３の周
波数において１０ｄＢ以上、それ以下のベースバ
ンド周波数において３０ｄＢの減衰量を有するハ
イパスフイルタ、１８：増幅器、ＯＵＴ１１：映
像信号出力端子、ＯＵＴ２１：入力レベル出力端
子。
FIG. 1 is a block diagram showing an embodiment of an input level detection device for an FM receiver according to the present invention, FIG. 2 is a block diagram showing a conventional input level detection device for an FM receiver, and FIG. 3 is a block diagram showing an example of an input level detection device for an FM receiver according to the present invention. The circuit diagrams of the high-pass filter used in FIGS. 4 and 5 are characteristic diagrams for explaining the present invention. IN: Low noise block down converter (
Input terminal 1 to which the output from (not shown) is input
1: 1st IF stage, 12: Mixer, 13: Local oscillator, 14: 2nd IF stage, 15: FM detector, 1
6: AM detector, 17: High pass filter having an attenuation of 10 dB or more at a frequency of 3.58 MHz x 3 and 30 dB at a baseband frequency below that, 18: Amplifier, OUT11: Video signal output terminal, OUT21: Input level Output terminal.
Claims (1)
つ少なくとも映像信号でＦＭ変調されている信号
を入力信号とするＦＭ受信機において、ＦＭ検波
回路のＦＭ検波出力を入力するとともに、３．５
８ＭＨｚ×３の周波数において１０ｄＢ以上、そ
れ以下のベースバンド周波数において３０ｄＢの
減衰量を有するハイパスフイルタと、前記ハイパ
スフイルタにより取り出されたノイズ成分を増幅
する増幅器と、前記増幅器の出力をＡＭ検波して
、直流分を出力するＡＭ検波器とを備え、上記Ａ
Ｍ検波器の出力を表示器に供給して、受信入力信
号のクオリテイーを表示することを特徴としたＦ
Ｍ受信機の入力レベル検出装置。 In an FM receiver whose input signal is a signal with a carrier noise ratio of about 0 to 20 dB and which is FM modulated with at least a video signal, the FM detection output of the FM detection circuit is input, and the FM detection output of the FM detection circuit is input.
a high-pass filter having an attenuation amount of 10 dB or more at a frequency of 8 MHz x 3 and 30 dB at a baseband frequency below that; an amplifier that amplifies the noise component extracted by the high-pass filter; and an amplifier that performs AM detection on the output of the amplifier. , and an AM detector that outputs a DC component,
F characterized in that the output of the M detector is supplied to a display device to display the quality of the received input signal.
M receiver input level detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986094626U JPH0336124Y2 (en) | 1986-06-23 | 1986-06-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986094626U JPH0336124Y2 (en) | 1986-06-23 | 1986-06-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS633636U true JPS633636U (en) | 1988-01-11 |
| JPH0336124Y2 JPH0336124Y2 (en) | 1991-07-31 |
Family
ID=30958276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986094626U Expired JPH0336124Y2 (en) | 1986-06-23 | 1986-06-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0336124Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0477847U (en) * | 1990-11-11 | 1992-07-07 |
-
1986
- 1986-06-23 JP JP1986094626U patent/JPH0336124Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0477847U (en) * | 1990-11-11 | 1992-07-07 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0336124Y2 (en) | 1991-07-31 |
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