JPH0356232U - - Google Patents
Info
- Publication number
- JPH0356232U JPH0356232U JP11574489U JP11574489U JPH0356232U JP H0356232 U JPH0356232 U JP H0356232U JP 11574489 U JP11574489 U JP 11574489U JP 11574489 U JP11574489 U JP 11574489U JP H0356232 U JPH0356232 U JP H0356232U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- variable bandwidth
- switching frequency
- detection
- comparison
- 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
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Noise Elimination (AREA)
Description
第１図はこの考案の１つの実施例に係るＦＭダ
イバーシテイチユーナを示すブロツク図、第２図
は第１図中の切換頻度検出回路と帯域幅可変制御
回路の具体的な構成を示す回路図、第３図は従来
のＦＭダイバーシテイチユーナを示すブロツク図
、第４図は第３図中の受信状態検出回路と比較回
路の具体的な構成を示す回路図である。
主な符号の説明、１０，１８……アンテナ、１
２，２０……フロントエンド、１４，１４Ａ，２
２……中間周波増幅回路、１６，２４……ＦＭ検
波器、２６，２８……受信状態検出回路、３６…
…比較回路、４０……帯域幅可変ＩＦフイルタ回
路、５６……切換頻度検出回路、６２……帯域幅
可変制御回路、ＳＷ……切り換えスイツチ。
FIG. 1 is a block diagram showing an FM diversity tuner according to one embodiment of this invention, and FIG. 2 is a circuit showing the specific configuration of the switching frequency detection circuit and variable bandwidth control circuit in FIG. 1. 3 is a block diagram showing a conventional FM diversity tuner, and FIG. 4 is a circuit diagram showing a specific configuration of the reception state detection circuit and comparison circuit in FIG. 3. Explanation of main symbols, 10, 18...Antenna, 1
2, 20...Front end, 14, 14A, 2
2... Intermediate frequency amplification circuit, 16, 24... FM detector, 26, 28... Reception state detection circuit, 36...
...comparison circuit, 40...variable bandwidth IF filter circuit, 56...switching frequency detection circuit, 62...variable bandwidth control circuit, SW...changeover switch.
Claims (1)
、検波器が複数系統装備され、各系統別に設けた
受信状態検出回路の検出出力を比較回路で比較し
、比較回路の比較結果に基づき切り換えスイツチ
で各系統の検波出力の中から最良の受信状態のも
のを選択するようにしたダイバーシテイチユーナ
において、 各系統の内、少なくとも１つの系統の中間周波
数増幅回路のＩＦフイルタ回路を、帯域幅が可変
な帯域幅可変ＩＦフイルタ回路とし、 切り換えスイツチの切り換え頻度を検出する切
換頻度検出回路と、 切換頻度検出回路で検出した切り換え頻度に基
づき、帯域幅可変ＩＦフイルタ回路に対する帯域
幅可変制御を行う帯域幅可変制御回路と、 を備えたことを特徴とするダイバーシテイチユー
ナ。[Claim for Utility Model Registration] Multiple systems are equipped with antennas, front ends, intermediate frequency amplification circuits, and detectors, and the detection outputs of reception state detection circuits provided for each system are compared by a comparison circuit, and the comparison results of the comparison circuits are provided. In a diversity tuner in which a changeover switch selects the one with the best reception condition from the detection output of each system based on the , a variable bandwidth IF filter circuit with a variable bandwidth, a switching frequency detection circuit that detects the switching frequency of the changeover switch, and a variable bandwidth IF filter circuit for the variable bandwidth IF filter circuit based on the switching frequency detected by the switching frequency detection circuit. A diversity tuner comprising: a variable bandwidth control circuit for performing control;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11574489U JPH0450668Y2 (en) | 1989-09-30 | 1989-09-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11574489U JPH0450668Y2 (en) | 1989-09-30 | 1989-09-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0356232U true JPH0356232U (en) | 1991-05-30 |
| JPH0450668Y2 JPH0450668Y2 (en) | 1992-11-30 |
Family
ID=31664062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11574489U Expired JPH0450668Y2 (en) | 1989-09-30 | 1989-09-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0450668Y2 (en) |
-
1989
- 1989-09-30 JP JP11574489U patent/JPH0450668Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0450668Y2 (en) | 1992-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE50100506D1 (en) | Antenna diversity system with phase-controlled summation of antenna signals | |
| JPH0356232U (en) | ||
| JPH0358047U (en) | ||
| JP2745081B2 (en) | Multi-wave simultaneous receiver | |
| JPH02130137U (en) | ||
| JP2525423Y2 (en) | Automatic IF band switching circuit for FM radio receiver for vehicle | |
| JPH062354Y2 (en) | Diversity receiver | |
| JPS61174239U (en) | ||
| JPH0270131A (en) | Vehicle mounted tv receiver | |
| JPS5821247Y2 (en) | FM car radio | |
| JPH0456425A (en) | Diversity receiver for rolling stock | |
| JPH0510431Y2 (en) | ||
| JPH0312542U (en) | ||
| JPS62177139U (en) | ||
| JPS6238353Y2 (en) | ||
| JPH0182531U (en) | ||
| JPH0457935U (en) | ||
| JPH01122638U (en) | ||
| JPS63169707U (en) | ||
| JPH0554734B2 (en) | ||
| JPS6193048U (en) | ||
| JPS63173945U (en) | ||
| JPH01119126A (en) | On-vehicle radio receiver | |
| JPH0427629U (en) | ||
| JPH0186737U (en) |