JPS6259939B2 - - Google Patents

Info

Publication number
JPS6259939B2
JPS6259939B2 JP56020619A JP2061981A JPS6259939B2 JP S6259939 B2 JPS6259939 B2 JP S6259939B2 JP 56020619 A JP56020619 A JP 56020619A JP 2061981 A JP2061981 A JP 2061981A JP S6259939 B2 JPS6259939 B2 JP S6259939B2
Authority
JP
Japan
Prior art keywords
electric field
antenna
circuit
output
comparison circuit
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.)
Expired
Application number
JP56020619A
Other languages
Japanese (ja)
Other versions
JPS57135533A (en
Inventor
Noryuki Kawamoto
Hideo Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP56020619A priority Critical patent/JPS57135533A/en
Publication of JPS57135533A publication Critical patent/JPS57135533A/en
Publication of JPS6259939B2 publication Critical patent/JPS6259939B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802Diversity 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
    • H04B7/0805Diversity 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 single receiver and antenna switching
    • H04B7/0814Diversity 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 single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold

Description

【発明の詳細な説明】 本発明は、最良のダイバーシテイ受信ができる
ように妨害レベル発生ひん度に応じてダイバーシ
テイ受信切換感度を制御するようにしたダイバー
シテイ受信装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diversity receiving device that controls diversity reception switching sensitivity according to the frequency of interference level occurrence so as to achieve the best diversity reception.

従来のFMダイバーシテイ受信装置の一例を第
1図に示す。これを説明すると、1,2はダイバ
ーシテイ受信用のアンテナ、3はアンテナ1,2
を切換えて受信するためのスイツチング用ダイオ
ードを用いた電子的な切換スイツチ、4はFM受
信機20のチユーナ部、5は中間周波増幅部、6
はFM検波部、7はFMステレオ復調部と電力増
幅部、8はスピーカである。また、9はFM受信
機20より検波出力を取出すための復調出力端
子、10は復調信号の歪(高調波成分)を取出す
ための100KHz以上の周波数信号を通過させるハ
イパスフイルタ、11は検出した歪を正のレベル
にするための検波回路、12は歪レベルと基準電
圧源14の基準電圧Esを比較するための比較回
路、13は比較回路12の出力によつてアンテナ
1または2の切換えを行なうためのフリツプフロ
ツプ回路、15はフリツプフロツプ回路13の出
力より制御信号を受けてアンテナ1,2を切換え
るための切換スイツチ3の制御端子である。
An example of a conventional FM diversity receiving device is shown in FIG. To explain this, 1 and 2 are antennas for diversity reception, and 3 is antenna 1 and 2.
4 is a tuner section of the FM receiver 20, 5 is an intermediate frequency amplification section, and 6 is an electronic changeover switch using a switching diode for switching and receiving.
is an FM detection section, 7 is an FM stereo demodulation section and a power amplification section, and 8 is a speaker. Further, 9 is a demodulation output terminal for extracting the detection output from the FM receiver 20, 10 is a high-pass filter that passes a frequency signal of 100 KHz or higher for extracting distortion (harmonic components) of the demodulated signal, and 11 is the detected distortion. 12 is a comparison circuit for comparing the distortion level with the reference voltage Es of the reference voltage source 14. 13 is a detection circuit for switching the antenna 1 or 2 according to the output of the comparison circuit 12. A flip-flop circuit 15 is a control terminal of a changeover switch 3 for receiving a control signal from the output of the flip-flop circuit 13 to switch between the antennas 1 and 2.

以上の構成において、例えば、今、アンテナ1
でFM受信機20が作動しているとすると、アン
テナ1で受信した高周波信号は切換スイツチ3を
通つてFM受信機20のチユーナ部4、中間周波
増幅部5を経てFM検波部6で低周波信号に復調
され、ステレオ信号の場合はFMステレオ復調部
と電力増幅部7を通してスピーカ8より発音され
る。
In the above configuration, for example, now antenna 1
When the FM receiver 20 is operating, the high frequency signal received by the antenna 1 passes through the changeover switch 3, the tuner section 4 of the FM receiver 20, the intermediate frequency amplification section 5, and then the FM detection section 6 outputs the low frequency signal. The signal is demodulated into a stereo signal, and in the case of a stereo signal, it is output from a speaker 8 through an FM stereo demodulator and a power amplifier 7.

一方、FM検波部6における復調信号の出力の
一部が復調出力端子9から取出される。
On the other hand, a part of the output of the demodulated signal from the FM detection section 6 is taken out from the demodulation output terminal 9.

そして、その復調信号の一部が、遮断周波数が
純粋な復調信号のスペクトラム以上(例えば
100KHz)のハイパスフイルタ10に通されるこ
とで、復調信号に含まれる高周波歪成分が抜き出
される。その歪成分は検波回路11で検波され、
比較回路12で基準電圧Esと比較される。ここ
で、もし、基準電圧Esよりも大きな電圧が加わ
れば、この受信系がマルチパスや妨害信号などよ
り悪くなつたとして、フリツプフロツプ回路13
を動作させて切換スイツチ3の制御端子15に制
御信号を加え、アンテナ1よりアンテナ2に切換
える。そして、また前記に説明した状態で動作を
繰返す。受信状態が良好な場合は歪が発生しない
ため、当然、アンテナの切換は行なわれない。し
たがつて、この受信系はアンテナ1または2の受
信において受信状態が悪くなればアンテナを切換
えて良好な受信をしようというものである。しか
し、比較回路12には、ある基準電圧Esが与え
られているため、それ以上の復調信号の歪レベル
が発生すればアンテナ切換え動作をする。すなわ
ち、これはSN比がある程度劣化すると切換わる
ことを意味している。したがつて、例えば、中・
強電界で40dB以上のSN比を得るように基準電圧
sを与えると、弱電界ではマルチパスなどの歪
がなくとも受信系で高SN比が確保できないた
め、比較回路が動作し、アンテナ切換えが連続的
となり、受信系に連続切換ノイズなどが発生し、
かえつて悪影響をおよぼす。また、アンテナ1,
2共に悪い状態の時も同時に連続切換えが起こ
る。また、逆に弱電界のSN比に着目して基準電
圧を与えても、強電界ではSN比が全般的に良い
ため、アンテナ切換え動作をしなくなる。
Then, a part of the demodulated signal has a cut-off frequency higher than the spectrum of the pure demodulated signal (for example,
By passing the signal through a high-pass filter 10 (100KHz), high-frequency distortion components contained in the demodulated signal are extracted. The distortion component is detected by the detection circuit 11,
Comparison circuit 12 compares it with reference voltage Es . Here, if a voltage larger than the reference voltage E s is applied, the reception system becomes worse due to multipath or interference signals, and the flip-flop circuit 13
is operated and a control signal is applied to the control terminal 15 of the changeover switch 3 to switch from antenna 1 to antenna 2. Then, the operation is repeated again in the state described above. When the reception condition is good, no distortion occurs, so naturally the antenna is not switched. Therefore, this receiving system is designed to switch antennas in order to obtain good reception if the reception condition of antenna 1 or 2 becomes poor. However, since a certain reference voltage E s is applied to the comparator circuit 12, if a distortion level of the demodulated signal higher than that occurs, the antenna switching operation is performed. In other words, this means that switching occurs when the SN ratio deteriorates to a certain extent. Therefore, for example,
If the reference voltage E s is applied to obtain an SN ratio of 40 dB or more in a strong electric field, a high SN ratio cannot be secured in the receiving system in a weak electric field even without distortion such as multipath, so the comparison circuit operates and the antenna is switched. becomes continuous, causing continuous switching noise etc. in the receiving system,
On the contrary, it has a negative effect. Also, antenna 1,
Continuous switching occurs at the same time when both conditions are bad. On the other hand, even if a reference voltage is applied by focusing on the SN ratio in a weak electric field, the antenna switching operation will not occur because the SN ratio is generally good in a strong electric field.

本発明は、そのような問題を解決するもので、
比較回路に与える基準電圧を電界強度に応じて変
化させることにより、良好な受信を行なうように
したものである。以下、本発明の実施例を第2図
とともに説明するが、図中、1〜13までのブロ
ツクは第1図で説明したものと構成的にも、動作
的にも同様であるので、ここでの重複する説明に
ついては省略する。第2図において、中間周波増
幅部5より、電界強度に応じた電圧(たとえば
AGC電圧)を端子16から取出す。この電界強
度に応じた電圧を、比較回路12に最適基準電圧
s′として与えるために、第3図のような特性を
持つ補正回路17に与え、その出力を基準電圧源
14′の基準電圧とする。
The present invention solves such problems,
Good reception is achieved by changing the reference voltage applied to the comparator circuit in accordance with the electric field strength. An embodiment of the present invention will be described below with reference to FIG. 2. In the figure, blocks 1 to 13 are similar in structure and operation to those explained in FIG. 1, so they will not be described here. Duplicate explanations will be omitted. In FIG. 2, a voltage (for example,
AGC voltage) is taken out from terminal 16. In order to provide a voltage corresponding to this electric field strength to the comparator circuit 12 as the optimum reference voltage Es ', it is applied to the correction circuit 17 having the characteristics as shown in FIG. 3, and its output is used as the reference voltage of the reference voltage source 14'. shall be.

このようにすることにより、弱電界では中間周
波増幅部5からの電界レベル電圧を高いレベルの
基準電圧Es′に変換して比較回路12に与えるこ
とにより比較回路12は動作しにくくなり、かな
り悪いSN比(マルチパス、ピケツトフエンシン
グ)の時だけアンテナ切換を行なうようになる。
また、強電界では上記とは逆に基準電圧Es′は低
くなるため、比較回路12は、ちよつとした歪
(マルチパスやピケツトフエンシング)にも動作
をし、SN比の高い領域でアンテナの切換えが行
なわれる。
By doing this, in a weak electric field, the electric field level voltage from the intermediate frequency amplifying section 5 is converted into a high level reference voltage E s ', which is applied to the comparator circuit 12, making it difficult for the comparator circuit 12 to operate, and it becomes considerably difficult to operate. Antenna switching is performed only when the signal-to-noise ratio (multipath, picket fencing) is poor.
In addition, in a strong electric field, contrary to the above, the reference voltage E s ' becomes low, so the comparator circuit 12 operates even with small distortions (multipath and picket fencing), and in a region with a high S/N ratio. Antenna switching takes place.

第4図a,bは前記補正回路17の回路構成例
を示す図で、そのほかにも種々の構成が考えられ
ることはいうまでもない。
FIGS. 4a and 4b are diagrams showing examples of circuit configurations of the correction circuit 17, and it goes without saying that various other configurations are possible.

このように本発明は弱電界から強電界に至るま
で比較回路の基準電圧を電界に応じて変化させる
ことにより、最適なダイバーシテイ受信を可能と
するものである。
As described above, the present invention enables optimal diversity reception by changing the reference voltage of the comparator circuit according to the electric field from a weak electric field to a strong electric field.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来のダイバーシテイ受信装置の一例
を示すブロツク図、第2図は本発明の一実施例を
示すブロツク図、第3図は本発明におけるダイバ
ーシテイ受信の電界と制御電圧の関係を示す補正
曲線図、第4図a,bは本発明で使用し得る補正
回路の例を示す回路図である。 1,2……ダイバーシテイ受信用のアンテナ、
3……切換スイツチ、9……復調出力端子、10
……ハイパスフイルタ、11……検波回路、12
……比較回路、13……フリツプフロツプ回路、
14′……基準電圧源、17……補正回路、20
……FM受信機。
Fig. 1 is a block diagram showing an example of a conventional diversity receiving device, Fig. 2 is a block diagram showing an embodiment of the present invention, and Fig. 3 shows the relationship between the electric field and control voltage in diversity reception in the present invention. The correction curve diagrams shown in FIGS. 4a and 4b are circuit diagrams showing examples of correction circuits that can be used in the present invention. 1, 2... Antenna for diversity reception,
3...Selector switch, 9...Demodulation output terminal, 10
...High pass filter, 11...Detection circuit, 12
... Comparison circuit, 13 ... Flip-flop circuit,
14'... Reference voltage source, 17... Correction circuit, 20
...FM receiver.

Claims (1)

【特許請求の範囲】[Claims] 1 ダイバーシテイ受信用の複数のアンテナと、
それらのアンテナを選択するごとく切換える切換
スイツチと、その切換スイツチからのアンテナ出
力が与えられる受信機と、ダイバーシテイ受信制
御部を含み、前記受信機の復調出力に生じるマル
チパスや電界定在波によるスキツプノイズなどの
歪(高調波成分)を検知してアンテナを切換え制
御する装置であつて、電界のレベルを検出する電
界レベル検出回路と、妨害レベル検出回路と、比
較回路を具備し、前記妨害レベル検出回路の出力
を前記比較回路の一方の入力端子に与え、前記電
界レベル検出回路の出力を前記比較回路の他方の
入力端子に与えて強電界から弱電界に対応した基
準電圧を前記比較回路に与えるようにし、電界強
度に応じて最良のアンテナ切換を行なうように構
成したことを特徴とするダイバーシテイ受信装
置。
1 Multiple antennas for diversity reception,
It includes a changeover switch that selects one of these antennas, a receiver to which the antenna output from the changeover switch is given, and a diversity reception control unit, and is configured to prevent multipath and electric field standing waves occurring in the demodulated output of the receiver. A device that detects distortion (harmonic components) such as skip noise and switches the antenna, and is equipped with an electric field level detection circuit that detects the electric field level, a disturbance level detection circuit, and a comparison circuit, The output of the detection circuit is applied to one input terminal of the comparison circuit, and the output of the electric field level detection circuit is applied to the other input terminal of the comparison circuit, so that a reference voltage corresponding to a strong electric field to a weak electric field is applied to the comparison circuit. What is claimed is: 1. A diversity receiving device characterized in that it is configured so as to switch antennas according to the strength of the electric field.
JP56020619A 1981-02-13 1981-02-13 Diversity receiver Granted JPS57135533A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56020619A JPS57135533A (en) 1981-02-13 1981-02-13 Diversity receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56020619A JPS57135533A (en) 1981-02-13 1981-02-13 Diversity receiver

Publications (2)

Publication Number Publication Date
JPS57135533A JPS57135533A (en) 1982-08-21
JPS6259939B2 true JPS6259939B2 (en) 1987-12-14

Family

ID=12032255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56020619A Granted JPS57135533A (en) 1981-02-13 1981-02-13 Diversity receiver

Country Status (1)

Country Link
JP (1) JPS57135533A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61237530A (en) * 1985-04-12 1986-10-22 Rhythm Watch Co Ltd On-vehicle diversity receiver
JP2708777B2 (en) * 1988-05-19 1998-02-04 三洋電機株式会社 Diversity receiver

Also Published As

Publication number Publication date
JPS57135533A (en) 1982-08-21

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