JPH0310627U - - Google Patents
Info
- Publication number
- JPH0310627U JPH0310627U JP7112789U JP7112789U JPH0310627U JP H0310627 U JPH0310627 U JP H0310627U JP 7112789 U JP7112789 U JP 7112789U JP 7112789 U JP7112789 U JP 7112789U JP H0310627 U JPH0310627 U JP H0310627U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- intermediate frequency
- level
- detection
- frequency amplification
- 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 14
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図は本考案の一実施例を示す図、第２図は
そのフローチヤート、第３図は従来例を示す図で
ある。
１１……高周波増幅回路、１２……局部発振回
路、１３……コントローラ（制御手段）、１５…
…周波数変換回路、１６……中間周波増幅回路、
１７……検波回路、１８……第１レベル検出回路
、１９……第２レベル検出回路。
FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a flowchart thereof, and FIG. 3 is a diagram showing a conventional example. 11... High frequency amplifier circuit, 12... Local oscillation circuit, 13... Controller (control means), 15...
...Frequency conversion circuit, 16...Intermediate frequency amplification circuit,
17...Detection circuit, 18...First level detection circuit, 19...Second level detection circuit.
Claims (1)
発振手段からの発振信号と前記高周波増幅手段か
らの出力信号に基づき中間周波信号を導出する周
波数変換手段と、この周波数変換手段からの中間
周波信号を増幅する中間周波増幅手段と、この中
間周波増幅手段からの中間周波信号を検波する検
波手段とを備えたラジオ受信機であつて、前記局
部発振手段に制御信号を供給することにより自動
同調動作を制御する制御手段と、前記中間周波増
幅手段に接続され、前記中間周波信号が第１レベ
ル以上のとき、検出信号を制御手段に供給する第
１レベル検出手段と、前記中間周波増幅手段に接
続され、前記中間周波信号が前記第１レベルより
も大なる第２レベル以上のとき、検出信号を制御
手段に供給する第２レベル検出手段とを設け、前
記制御手段は前記第２レベル検出手段からの検出
信号に応じて自動同調動作を停止すると共に、前
記第１レベル検出手段からの検出信号のみに応じ
て所定期間、自動同調動作を停止するようになさ
れていることを特徴とするラジオ受信機。 a high frequency amplification means, a local oscillation means, a frequency conversion means for deriving an intermediate frequency signal based on an oscillation signal from the local oscillation means and an output signal from the high frequency amplification means, and a frequency conversion means for deriving an intermediate frequency signal from the frequency conversion means. A radio receiver comprising an intermediate frequency amplification means for amplifying an intermediate frequency signal and a detection means for detecting an intermediate frequency signal from the intermediate frequency amplification means, wherein an automatic tuning operation is performed by supplying a control signal to the local oscillation means. first level detection means connected to the intermediate frequency amplification means and supplying a detection signal to the control means when the intermediate frequency signal is at a first level or higher; and first level detection means connected to the intermediate frequency amplification means. , a second level detection means for supplying a detection signal to a control means when the intermediate frequency signal is at a second level or higher that is higher than the first level, and the control means receives a detection signal from the second level detection means. A radio receiver characterized in that the automatic tuning operation is stopped in response to a detection signal, and the automatic tuning operation is stopped for a predetermined period only in response to the detection signal from the first level detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7112789U JPH0310627U (en) | 1989-06-16 | 1989-06-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7112789U JPH0310627U (en) | 1989-06-16 | 1989-06-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0310627U true JPH0310627U (en) | 1991-01-31 |
Family
ID=31607884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7112789U Pending JPH0310627U (en) | 1989-06-16 | 1989-06-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0310627U (en) |
-
1989
- 1989-06-16 JP JP7112789U patent/JPH0310627U/ja active Pending
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