JPH028224U - - Google Patents
Info
- Publication number
- JPH028224U JPH028224U JP8534488U JP8534488U JPH028224U JP H028224 U JPH028224 U JP H028224U JP 8534488 U JP8534488 U JP 8534488U JP 8534488 U JP8534488 U JP 8534488U JP H028224 U JPH028224 U JP H028224U
- Authority
- JP
- Japan
- Prior art keywords
- field strength
- electric field
- tuning
- section
- detects
- 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 9
- 230000005684 electric field Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
Description
第１図はこの考案の１つの実施例に係るＦＭ受
信機のブロツク図、第２図は第１図中のマイクロ
コンピユータの動作を示すフローチヤート、第３
図は第１図のＦＭ受信機の動作を示すタイムチヤ
ート、第４図は従来のＦＭ受信機のブロツク図、
第５図は第１図と第４図中の電界強度検出回路の
出力と同調周波数変化の関係及び同調検出回路の
出力と同調周波数変化との関係を示す線図、第６
図は第４図中のマイクロコンピユータの動作を示
すフローチヤート、第７図は第４図のＦＭ受信機
の動作を示すタイムチヤートである。
１２：高周波増幅回路、１４：周波数混合回路
、１６：ＰＬＬ回路、１８：周波数弁別器、３８
：可変分周器、４６：電界強度検出回路、４８：
ＡＦＣ回路、５０：同調検出回路、５４Ａ：マイ
クロコンピユータ、７０，７２：比較回路。
FIG. 1 is a block diagram of an FM receiver according to one embodiment of this invention, FIG. 2 is a flowchart showing the operation of the microcomputer in FIG. 1, and FIG.
The figure is a time chart showing the operation of the FM receiver in Figure 1, and Figure 4 is a block diagram of a conventional FM receiver.
Figure 5 is a diagram showing the relationship between the output of the field strength detection circuit and the change in tuning frequency in Figures 1 and 4, and the relationship between the output of the tuning detection circuit and change in the tuning frequency;
This figure is a flowchart showing the operation of the microcomputer in FIG. 4, and FIG. 7 is a time chart showing the operation of the FM receiver in FIG. 4. 12: High frequency amplifier circuit, 14: Frequency mixing circuit, 16: PLL circuit, 18: Frequency discriminator, 38
: variable frequency divider, 46: electric field strength detection circuit, 48:
AFC circuit, 50: Tuning detection circuit, 54A: Microcomputer, 70, 72: Comparison circuit.
Claims (1)
出部と、 周波数データを入力して周波数制御信号を形成
しＦＭフロントエンドへ出力して同調周波数を可
変させるＰＬＬ部と、 自動選局指令に基づき、電界強度検出部が所定
レベル以上の電界強度を検出するまでは短い時間
間隔で所定単位ずつ変化する周波数データをＰＬ
Ｌ部へ出力し、電界強度検出部が所定レベル以上
の電界強度を検出したあとはＰＬＬ部へ出力する
周波数データの変化間隔を長くし、電界強度検出
部が所定レベル以上の電界強度を検出し、同調検
出部が同調を検出したとき周波数データの変化を
止める自動選局制御部と、 を含むことを特徴とするＦＭ受信機の自動選局装
置。[Scope of Claim for Utility Model Registration] An electric field strength detection section that detects received electric field strength, a tuning detection section that inputs an FM detection signal to detect tuning, and an FM front that inputs frequency data to form a frequency control signal. A PLL section that outputs to the end to vary the tuned frequency, and a PLL section that outputs frequency data that changes by a predetermined unit at short time intervals based on an automatic tuning command until the field strength detection section detects a field strength of a predetermined level or higher.
After the electric field strength detecting section detects the electric field strength of a predetermined level or higher, the change interval of the frequency data output to the PLL section is lengthened, and the electric field strength detecting section detects the electric field strength of a predetermined level or higher. An automatic tuning device for an FM receiver, comprising: an automatic tuning control unit that stops changing frequency data when the tuning detection unit detects tuning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8534488U JPH028224U (en) | 1988-06-28 | 1988-06-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8534488U JPH028224U (en) | 1988-06-28 | 1988-06-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH028224U true JPH028224U (en) | 1990-01-19 |
Family
ID=31310016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8534488U Pending JPH028224U (en) | 1988-06-28 | 1988-06-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH028224U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06296144A (en) * | 1993-04-01 | 1994-10-21 | Fujitsu Ten Ltd | Radio receiver |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57170617A (en) * | 1981-04-13 | 1982-10-20 | Nec Corp | Receiver |
-
1988
- 1988-06-28 JP JP8534488U patent/JPH028224U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57170617A (en) * | 1981-04-13 | 1982-10-20 | Nec Corp | Receiver |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06296144A (en) * | 1993-04-01 | 1994-10-21 | Fujitsu Ten Ltd | Radio receiver |
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