JPS5868328A - Space diversity reception system - Google Patents
Space diversity reception systemInfo
- Publication number
- JPS5868328A JPS5868328A JP56165801A JP16580181A JPS5868328A JP S5868328 A JPS5868328 A JP S5868328A JP 56165801 A JP56165801 A JP 56165801A JP 16580181 A JP16580181 A JP 16580181A JP S5868328 A JPS5868328 A JP S5868328A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- circuits
- receiving
- components
- intermediate frequency
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
- H04B7/082—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection selecting best antenna path
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はスペースダイバシティ方式に関し、詳しくは例
えばカーラジオにおけるＦＭ−ｒルチパスノイズの低減
回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a space diversity system, and more particularly to a circuit for reducing FM-r multipath noise in, for example, a car radio.
従来の５トルチパスノイズの低減法としては、第１図に
示すように、中間周波回路５よりキャリア信号を取り出
し、該キャリアレベルによりて、へマルチプレックス５
のステレオセパレージ嘗ンと、高域の周波数特性を下げ
、マルチパスノイズを聴感的に緩和するものがある。As shown in FIG. 1, the conventional method for reducing 5-torchipath noise is to extract a carrier signal from an intermediate frequency circuit 5, and to multiplex it to 5 according to the carrier level.
There are stereo separation methods and methods that lower the high frequency response to audibly alleviate multipath noise.
しかし、この方法では、マルチパスノイズが完全には、
キャリアレベルの変化に対応していないため、マルチパ
スノイズを完全になくすことはできないという欠点があ
った。However, this method does not completely eliminate multipath noise.
Since it does not correspond to changes in the carrier level, it has the disadvantage that multipath noise cannot be completely eliminated.
本発明の目的は上記した従来技術の欠点をなくシ、マル
チパスノイズを低減するためのスペースダイバシティ方
式の制御方式を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and provide a space diversity control method for reducing multipath noise.
マルチパスノイズの発生時には、キャリアレベルの変化
の他に、中間周波信号に、原変調成分が発生する。従っ
てこの周成分を検出し、スペースダイパシティ方式の制
御信号として、２系統の受信回路を切換えれば、マルチ
パスノイズ除去に効果がある。When multipath noise occurs, in addition to changes in carrier level, an original modulation component is generated in the intermediate frequency signal. Therefore, if this frequency component is detected and used as a control signal for the space-diaperity method to switch between the two receiving circuits, multipath noise can be effectively removed.
以下、本発明の実施例を第２図により説明する。この回
路は、２つの受信回路ＡＩＡから成り、該受信回路の検
波回路４．４′の検波出力信号は夫々信号切換回路１２
に供給され、該回路にて一方の検波出力信号が選択され
て後段の出力回路に導かれる。また中間周波回路３，３
′の中間周波信号は個検波回路８，８により、個検波さ
れその出力には個変調成分のみが取り出される。この個
変詞成分はバンドパスフィルタ９，９′に供給され、該
フィルタに”（１９）Ｇ（Ｚ〜６０ＫＨ１の成分を取り
出される。この出力信号は整流回路Ｉ Ｑ 、 １０’
にて整流され、次段の比較回路１１にてそのレベルを比
較され、比較回路１１はこの時耐変調成分の小さい側の
受信回路の信号を出力回路に導く如く上記信号切換回路
を制御する信号を出力する。Embodiments of the present invention will be described below with reference to FIG. This circuit consists of two receiving circuits AIA, and the detection output signals of the detection circuits 4 and 4' of the receiving circuits are sent to the signal switching circuits 12 and 12, respectively.
One of the detection output signals is selected by the circuit and guided to the subsequent output circuit. Also, intermediate frequency circuits 3, 3
The intermediate frequency signal ' is individually detected by the individual detection circuits 8, 8, and only the individual modulation components are taken out as the output. This individual particle component is supplied to band pass filters 9 and 9', and the filter extracts the component of "(19)G(Z~60KH1").This output signal is sent to the rectifier circuit IQ, 10'
The comparator circuit 11 in the next stage compares the levels, and the comparator circuit 11 then outputs a signal that controls the signal switching circuit so as to guide the signal from the receiving circuit with the smaller modulation resistance component to the output circuit. Output.
要するに本発明はマルチパスノイズ発生時に発生する成
分を取り出し、この成分を利用して信号切換回路の切換
えを制御してなるものであルチバスによって生じる成分
以外の靴音も入っていることから誤動作が発生する。し
かしマルチパスノイズがステレオ放送時に特に顕著であ
ることを考えて、この周成分のうち、ステレオパイロッ
ト信号である１ ９ＩＧ（ｚからステレオ信号成分の６
０Ｋｌ（ｚまでの周成分を取り出し、これを制御信号と
している上記実施例によれば、誤動作は解消できる。In short, the present invention extracts the component that occurs when multipath noise occurs and uses this component to control switching of the signal switching circuit. Malfunctions occur because shoe sounds other than components generated by multipath noise are also included. do. However, considering that multipath noise is particularly noticeable during stereo broadcasting, among these frequency components, the stereo pilot signal 19IG (from z to the stereo signal component 6
According to the above embodiment in which the frequency component up to 0Kl(z is extracted and used as the control signal), malfunctions can be eliminated.
以上述べた本発明によれば、従来、キャリアレベルを制
御信号としていたため、マルチパスノイズの発生時にキ
ャリアレベルが変化しない場合に誤動作していたが、本
発明は、マルチパスノイズ発生時に発生するへ変調成分
を制御信号として、２つの受信回路を切換え、歪のない
電波を受信することができるので、スペースダイバシテ
ィ方式として、誤動作なく、マルチパスノイズを低減で
きるという効果がある。According to the present invention described above, since the carrier level was conventionally used as a control signal, malfunction occurred if the carrier level did not change when multipath noise occurred. Since the two receiving circuits can be switched using the modulated component as a control signal and receive undistorted radio waves, the space diversity method has the effect of reducing multipath noise without malfunction.
第１図は従来のセパレーション制御回路の、ブロック図
、第２図は本発明の一実施例を示すスペースダイバシテ
ィ方式のブロック図である。
１・・・・・・アンテナ、 ２・・・・・・耐フ
ロントエ／ド、３・・・・・・ＩＦ回路、
４・・・・・・検波回路、５・・・・・・へマルチ回路
、 ６・・・・・・オーディオ回路、７・・・・・・
スピーカー、 ８・・・・・・個検波回路、９・・
・・・・バンドパスフィルタ、
１０・・・・・・倍電圧整流回路、１１・・・・・・比
較回路、１２・・・・・・切換回路、 １・・・
・・・サブアンテナ。
２：・・・・・サブフロントエンド、
５′・・・・・・サブ検波回路、 ４′・・・・・
・サブ検波回路、８′・・・・・・サブＡＭ検波回路、
９′・・・・・・す７’ １９ＫＨｚ ／＜ンドバスフ
ィルタ、１０′・・・・・・サブ倍電圧整流回路。
代理人弁理士 薄 １）利 幸−
７禍１
才 １ 記FIG. 1 is a block diagram of a conventional separation control circuit, and FIG. 2 is a block diagram of a space diversity system showing an embodiment of the present invention. 1...Antenna, 2...Front E/D resistance, 3...IF circuit,
4...Detection circuit, 5...Multi circuit, 6...Audio circuit, 7...
Speaker, 8... Individual detection circuit, 9...
... Band pass filter, 10 ... Voltage doubler rectifier circuit, 11 ... Comparison circuit, 12 ... Switching circuit, 1 ...
...Sub antenna. 2:...Sub front end, 5'...Sub detection circuit, 4'...
・Sub detection circuit, 8'...Sub AM detection circuit, 9'...7'19KHz/< bus filter, 10'...Sub voltage doubler rectifier circuit. Representative Patent Attorney Susuki 1) Yuki Toshi - 7magai 1 year old 1 year old
Claims (1)
の出力を切換選択して出力回路に導く信号切換回路と、
上記第１．第２の受信回路の中間周波信号を２ｍ検波す
る第１．第２の検波回路と、該第１．第２の検波回路の
検波出力から１９ＫＨｚ〜６ＤＫＨｚまでのＡＭ成分を
抽出する第１．第２のバンドパスフィルタと、該フィル
タをバスした周成分を整流する第１゜第２の整流回路と
、該第１．第２の整流回路に結合され、該整流信号のレ
ベルを比較し、上記信号切換回路を上記第１．第２の受
信回路の上記周成分の小さい側に切換える制御信号を出
力する比較器とからなることを特徴とするスペースダイ
バシティ受信方式。t 1st. a second receiving circuit; a signal switching circuit that switches and selects the output of the second receiving circuit and guides it to the output circuit;
Above 1. The first one detects the intermediate frequency signal of the second receiving circuit by 2m. a second detection circuit; The 1st. a second band-pass filter; a first and second rectifier circuit that rectifies the frequency components passed through the filter; The signal switching circuit is connected to the first rectifier circuit, compares the levels of the rectified signals, and connects the signal switching circuit to the first rectifier circuit. A space diversity receiving system comprising: a comparator that outputs a control signal for switching the second receiving circuit to the side where the frequency component is smaller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56165801A JPS5868328A (en) | 1981-10-19 | 1981-10-19 | Space diversity reception system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56165801A JPS5868328A (en) | 1981-10-19 | 1981-10-19 | Space diversity reception system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5868328A true JPS5868328A (en) | 1983-04-23 |
| JPH0150146B2 JPH0150146B2 (en) | 1989-10-27 |
Family
ID=15819245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56165801A Granted JPS5868328A (en) | 1981-10-19 | 1981-10-19 | Space diversity reception system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5868328A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4823398A (en) * | 1985-12-23 | 1989-04-18 | Kazuya Hashimoto | Diversity receiver |
| US4864642A (en) * | 1987-04-08 | 1989-09-05 | Pioneer Electronic Corporation | Space diversity receiving system |
| US4882589A (en) * | 1986-12-29 | 1989-11-21 | Hughes Aircraft Company | Coherent switching system for a multiple beam antenna |
-
1981
- 1981-10-19 JP JP56165801A patent/JPS5868328A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4823398A (en) * | 1985-12-23 | 1989-04-18 | Kazuya Hashimoto | Diversity receiver |
| US4882589A (en) * | 1986-12-29 | 1989-11-21 | Hughes Aircraft Company | Coherent switching system for a multiple beam antenna |
| US4864642A (en) * | 1987-04-08 | 1989-09-05 | Pioneer Electronic Corporation | Space diversity receiving system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0150146B2 (en) | 1989-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3823268A (en) | Dynamic stereo separation control | |
| CN101359920B (en) | FM tuner | |
| US20050020220A1 (en) | Radio receiver | |
| US5432854A (en) | Stereo FM receiver, noise control circuit therefor | |
| JPH04246936A (en) | Ultrashort-wave car radio | |
| JPS5868328A (en) | Space diversity reception system | |
| JPS5999886A (en) | Voice information detector | |
| US4620315A (en) | Automatic frequency control circuit in a stereo FM radio receiver | |
| JPH07193553A (en) | Detector device of adjacent channel fault | |
| US5136649A (en) | Fm stereophonic receiver | |
| JPH0150145B2 (en) | ||
| US4769841A (en) | Receiver for compatible FM stereophonic system utilizing companding of difference signal | |
| JPS5910080A (en) | Receiver for television sound multiplex broadcast | |
| JPS6029260Y2 (en) | Audio multiplex broadcast control signal detection circuit | |
| JP3120457B2 (en) | Diversity type FM receiver | |
| JPS61134130A (en) | Car radio receiving set | |
| JPS596700A (en) | Synthesizer receiver | |
| JPH0317486Y2 (en) | ||
| JPS6135079A (en) | Receiver of sound multiplex broadcast | |
| JP3119490B2 (en) | Diversity type FM receiver | |
| JP2895858B2 (en) | FM stereo receiver | |
| JPS598442A (en) | Receiver | |
| JP2583757B2 (en) | Sound field control circuit | |
| JPH06197087A (en) | Stereo broadcast signal receiver | |
| JPS59190747A (en) | Multipath distortion reducing device of fm receiver |