JPH0621858A - Diversity receiver - Google Patents
Diversity receiverInfo
- Publication number
- JPH0621858A JPH0621858A JP4176547A JP17654792A JPH0621858A JP H0621858 A JPH0621858 A JP H0621858A JP 4176547 A JP4176547 A JP 4176547A JP 17654792 A JP17654792 A JP 17654792A JP H0621858 A JPH0621858 A JP H0621858A
- Authority
- JP
- Japan
- Prior art keywords
- receiving
- signal
- antenna
- reception
- 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.)
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- Radio Transmission System (AREA)
- Stereo-Broadcasting Methods (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はＦＭ放送受信機等に使用
されるダイバシティ通信装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diversity communication device used for FM broadcast receivers and the like.
【０００２】[0002]
【従来の技術】従来、このようなダイバシティ受信装置
は図２に示すように第１系統の受信手段（以下、単に第
１系統と称す）１１０と、第２系統の受信手段（以下、
単に第２系統と称す）１２０と、比較検知手段である比
較検出回路１３０と、制御手段である切換回路１４１と
信号切換回路１４２とステレオ復調回路１４３とから構
成されている。また、第１系統１１０は受信アンテナ１
１１とチューナー部１１２とＩＦ検波回路１１３とから
構成されており、第２系統１２０も同様に受信アンテナ
１２１とチューナー部１２２とＩＦ検波回路１２３とか
ら構成されている。2. Description of the Related Art Conventionally, such a diversity receiver has a first system receiving means (hereinafter, simply referred to as a first system) 110 and a second system receiving means (hereinafter
The second system) 120, a comparison detection circuit 130 which is a comparison detection means, a switching circuit 141 which is a control means, a signal switching circuit 142, and a stereo demodulation circuit 143. The first system 110 is the receiving antenna 1
11, the tuner section 112, and the IF detection circuit 113, and the second system 120 similarly includes the reception antenna 121, the tuner section 122, and the IF detection circuit 123.
【０００３】上記のように構成された従来のダイバシテ
ィ受信装置の動作について説明する。The operation of the conventional diversity receiver configured as above will be described.
【０００４】第１系統１１０の受信アンテナ１１１は放
送局からの変調信号を受信してチューナー部１１２に供
給する。チューナー部１１２はこの変調信号をＩＦ検波
回路１１３に供給する。ＩＦ検波回路１１３は変調信号
を信号切換部１４２に供給すると共に、変調信号から電
界強度に比例したシグナルメーター電圧を切換回路１４
１に供給する。また、ＩＦ検波回路１１３は受信状態に
応じた受信状態検出信号を比較検出回路１３０に供給す
る。The receiving antenna 111 of the first system 110 receives the modulated signal from the broadcasting station and supplies it to the tuner section 112. The tuner section 112 supplies this modulated signal to the IF detection circuit 113. The IF detection circuit 113 supplies the modulation signal to the signal switching unit 142, and also switches the signal meter voltage proportional to the electric field strength from the modulation signal to the switching circuit 14.
Supply to 1. Further, the IF detection circuit 113 supplies a reception state detection signal according to the reception state to the comparison detection circuit 130.
【０００５】また、第２系統１２０の受信アンテナ１２
１も上記第１系統１１０が受信する放送局からの同じ変
調信号を受信して同様の動作を行う。Further, the receiving antenna 12 of the second system 120
1 also receives the same modulated signal from the broadcasting station received by the first system 110 and performs the same operation.
【０００６】そして、比較検出回路１３０は第１系統１
１０からの検波出力信号と第２系統１２０からの検波出
力信号とを比較検知して、よりハイレベルの検波出力信
号に対応した選択信号を信号切換回路１４２と切換回路
１４１とに供給する。The comparison and detection circuit 130 is the first system 1
The detection output signal from 10 and the detection output signal from the second system 120 are compared and detected, and a selection signal corresponding to a higher level detection output signal is supplied to the signal switching circuit 142 and the switching circuit 141.
【０００７】信号切換回路１４２は選択信号に応じて、
よりハイレベルの変調信号を受信した系統からの検波出
力信号を選択してステレオ復調回路１４３に供給する。
また、切換回路１４１も同様に選択信号に応じてどちら
か一方の系統１１０（１２０）からのシグナルメーター
電圧をメーター表示回路、ステレオ・モノラル切換回
路、その他の各種回路に供給する。The signal switching circuit 142 responds to the selection signal by
The detection output signal from the system that receives the higher-level modulated signal is selected and supplied to the stereo demodulation circuit 143.
Similarly, the switching circuit 141 also supplies the signal meter voltage from one of the systems 110 (120) to the meter display circuit, the stereo / monaural switching circuit, and other various circuits according to the selection signal.
【０００８】ステレオ復調回路１４３は検波出力信号を
復調して、Ｌチャンネル端子１５０及びＲチャンネル端
子１５１からスピーカー（図示せず）に供給する。The stereo demodulation circuit 143 demodulates the detected output signal and supplies it from the L channel terminal 150 and the R channel terminal 151 to a speaker (not shown).
【０００９】尚、一般に１系統１１０と第２系統１２０
の各受信アンテナ１１１，１２１は、一方の系統１１０
（１２０）でマルチパス等の妨害を受けたとしても他方
の系統１２０（１１０）で全く妨害がないか軽減されて
いる可能性があり、常に受信状態の良好な系統に切換選
択して、安定した受信状態を得ることができるために、
各受信アンテナ１１１，１２１の位置を互いにずらすこ
とによりスペースダイバシティを構成したり、各受信ア
ンテナ１１１，１２１の偏波面を変えることにより偏波
面ダイバシティを構成している。Generally, one system 110 and the second system 120
Each receiving antenna 111, 121 of
Even if interference such as multipath is received at (120), there is a possibility that the other system 120 (110) has no interference or mitigation at all, and it is always stable by selecting and switching to a system with good reception conditions. In order to obtain the received status,
Space diversity is configured by shifting the positions of the receiving antennas 111 and 121 from each other, and polarization plane diversity is configured by changing the polarization planes of the receiving antennas 111 and 121.
【００１０】また、この比較検出回路１３０に使用され
る比較方法においては、電界強度の比較、マルチパス妨
害程度の比較等といった方法が取られており、電界強度
の比較はシグナルメーター電圧により比較を行い、例え
ばコンパレータで両系統１１０，１２０からの前記電圧
を比較して選択信号を送出するものであり、また、マル
チパス妨害程度の比較は、例えばＦＭ検波出力の１００
ＫＨｚ周辺のノイズレベルを検出する等の方法があり、
両系統１１０，１２０からのノイズレベルを比較して、
ノイズレベルの少ない方の系統を選択するように選択信
号を送出するものである。Further, in the comparison method used in the comparison / detection circuit 130, methods such as comparison of electric field strength, comparison of multipath interference degree, etc. are adopted, and comparison of electric field strength is made by a signal meter voltage. For example, a comparator compares the voltages from both systems 110 and 120 and sends out a selection signal, and the comparison of the degree of multipath interference is performed by, for example, FM detection output of 100.
There are methods such as detecting the noise level around KHz,
Comparing the noise levels from both systems 110 and 120,
The selection signal is transmitted so as to select the system having the smaller noise level.
【００１１】上記のように構成された従来のダイバシテ
ィ受信装置によれば、第１系統１１０と第２系統１２０
との２系統を備え、両系統の内、検波出力信号の受信状
態を判定して一方の系統を選択することにより、検波出
力信号とシグナルメーター電圧との両系統の内、一方を
同時に選択することができる。このようにして２系統の
内、受信状態の良い一方を選択することができる。According to the conventional diversity receiver configured as described above, the first system 110 and the second system 120 are provided.
, And by selecting one of the two systems by judging the reception state of the detection output signal of both systems, one of the systems of the detection output signal and the signal meter voltage is simultaneously selected. be able to. In this way, it is possible to select one of the two systems that has a better reception state.
【００１２】[0012]
【発明が解決しようとする課題】しかしながら、上記従
来のダイバシティ受信装置においては、第１系統１１０
と第２系統１２０との各チューナー部１１２，１２２の
特性（例えば感度特性や選択度特性等）や、各ＩＦ検波
回路１１３，１２３の特性を一致させなければならず、
各製品の回路を調整したりする作業は非常に手間がかか
るという問題点があった。However, in the above-mentioned conventional diversity receiver, the first system 110 is used.
And the characteristics of the tuner sections 112 and 122 of the second system 120 (for example, sensitivity characteristics and selectivity characteristics) and the characteristics of the IF detection circuits 113 and 123 must match.
There has been a problem that the work of adjusting the circuit of each product is very troublesome.
【００１３】本発明は、上記問題点に鑑みて成されたも
のであり、その目的とするところは、回路構成及び回路
調整を簡素化することができるダイバシティ受信装置を
提供することにある。The present invention has been made in view of the above problems, and an object of the present invention is to provide a diversity receiver capable of simplifying the circuit configuration and circuit adjustment.
【００１４】[0014]
【課題を解決するための手段】上記目的を達成するため
に本発明は、送信局からの変調信号を受信する複数の受
信アンテナと、一つの受信アンテナから送出される一つ
の変調信号を受信状態検出信号に変換して送出する第１
系統の受信手段と、他の受信アンテナから送出される他
の変調信号を受信状態検出信号に変換して送出する一つ
又は複数の第２系統の受信手段と、前記第１系統の受信
手段からの受信状態検出信号と前記第２系統の受信手段
からの受信状態検出信号を比較検知して選択信号を送出
する比較検知手段と、前記選択信号に応じてよりハイレ
ベルの変調信号を受信する受信アンテナを前記第１系統
の受信手段に接続し、他の受信アンテナを前記第２系統
の受信手段に接続するアンテナ切換回路とを備え、前記
第１系統の受信手段で検波された検波出力信号を出力す
るようにしたものである。In order to achieve the above object, the present invention is directed to a plurality of receiving antennas for receiving modulated signals from a transmitting station and a receiving state of one modulated signal transmitted from one receiving antenna. First to convert into detection signal and send out
From the receiving means of the first system, the receiving means of the first system, the receiving means of the second system, the one or more receiving means of the second system for converting the other modulated signal sent from the other receiving antenna into the reception state detection signal and sending the signal. Comparison detecting means for comparing and detecting the reception state detection signal of the second system and the reception state detection signal from the receiving means of the second system, and transmitting a selection signal; An antenna switching circuit that connects an antenna to the receiving means of the first system and connects another receiving antenna to the receiving means of the second system, and outputs a detection output signal detected by the receiving means of the first system. It is designed to be output.
【００１５】[0015]
【作用】複数の受信アンテナが受信する電波信号の感度
状態を比較して、感度の最も良好な受信アンテナに第１
系統の受信手段を常時接続するようにアンテナ切換回路
を操作して、ステレオ復調回路を介してオーディオ出力
を送出することができるので、第１系統の受信手段と複
数の第２系統の受信手段内のチューナー部のレベル差や
特性を一致させる作業を必要とせず、回路構成や回路調
整も簡素化することができる。Operation: The sensitivity states of radio signals received by a plurality of receiving antennas are compared, and the receiving antenna with the highest sensitivity is firstly selected.
Since the audio output can be sent out through the stereo demodulation circuit by operating the antenna switching circuit so that the receiving means of the system is always connected, the receiving means of the first system and the receiving means of the plurality of second systems are provided. It is possible to simplify the circuit configuration and the circuit adjustment without requiring the work of matching the level difference and the characteristics of the tuner section.
【００１６】[0016]
【実施例】以下、図面に基づいて本発明のダイバシティ
受信装置について説明する。図１は本発明のダイバシテ
ィ受信装置の概略を示すブロック図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A diversity receiver of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an outline of a diversity receiving apparatus of the present invention.
【００１７】本発明のダイバシティ受信装置は２つの受
信アンテナ１１及び１２と、第１系統の受信手段（以
下、単に第１系統と称す）２０と、第２系統の受信手段
（以下、単に第２系統と称す）３０と、アンテナ切換回
路４０と、比較検知手段である比較検出回路５０と、ス
テレオ復調回路６０とから構成されている。第１系統２
０はチューナー部２１とＩＦ検波回路２２とから構成さ
れており、第２系統３０も同様にチューナー部３１とＩ
Ｆ検波回路３２とから構成されている。The diversity receiving apparatus of the present invention comprises two receiving antennas 11 and 12, a first system receiving means (hereinafter simply referred to as the first system) 20, and a second system receiving means (hereinafter simply referred to as the second system). System) 30, an antenna switching circuit 40, a comparison detection circuit 50 as comparison detection means, and a stereo demodulation circuit 60. First system 2
Reference numeral 0 is composed of a tuner section 21 and an IF detection circuit 22, and the second system 30 similarly has a tuner section 31 and an I detection circuit 22.
And an F detection circuit 32.
【００１８】上記のように構成された本発明のダイバシ
ティ受信装置の動作について説明する。The operation of the diversity receiving apparatus of the present invention configured as above will be described.
【００１９】受信アンテナ１１は放送局からの変調信号
を受信してアンテナ切換回路４０に供給する。また、受
信アンテナ１２も前記受信アンテナ１１と同様に同じ変
調信号をアンテナ切換回路４０に供給する。The receiving antenna 11 receives the modulated signal from the broadcasting station and supplies it to the antenna switching circuit 40. Further, the receiving antenna 12 also supplies the same modulated signal to the antenna switching circuit 40 as the receiving antenna 11.
【００２０】アンテナ切換回路４０は各変調信号を各系
統２０，３０のチューナー部２１，３１に供給する。そ
して、各チューナー部２１，３１は変調信号を各ＩＦ検
波回路２２，３２に供給する。各ＩＦ検波回路２２，３
２は変調信号を検波して受信状態検出信号としての検波
出力信号を比較検出回路５０に供給する。The antenna switching circuit 40 supplies each modulated signal to the tuner section 21, 31 of each system 20, 30. Then, the tuner units 21 and 31 supply the modulated signals to the IF detection circuits 22 and 32. Each IF detection circuit 22, 3
2 detects the modulated signal and supplies a detection output signal as a reception state detection signal to the comparison detection circuit 50.
【００２１】また、第１系統２０のＩＦ検波回路２２は
変調信号をステレオ復調回路６０に供給すると共に、変
調信号から電界強度に比例したシグナルメーター電圧を
メーター表示回路、ステレオ・モノラル切換回路、その
他の各種回路に供給する。Further, the IF detection circuit 22 of the first system 20 supplies the modulation signal to the stereo demodulation circuit 60, and at the same time, outputs a signal meter voltage proportional to the electric field strength from the modulation signal to a meter display circuit, a stereo / monaural switching circuit, etc. Supply to various circuits.
【００２２】比較検出回路５０は第１系統２０からの検
波出力信号と第２系統３０からの検波出力信号とを比較
検知して、よりハイレベルの検波出力信号に対応した選
択信号をアンテナ切換回路４０に供給する。The comparison and detection circuit 50 compares and detects the detection output signal from the first system 20 and the detection output signal from the second system 30, and outputs a selection signal corresponding to the higher level detection output signal to the antenna switching circuit. Supply to 40.
【００２３】アンテナ切換回路４０は選択信号に応じて
各受信アンテナ１１，１２と各系統２０，３０のチュー
ナー部２１，３１とを接続する。例えば比較検出回路５
０において、受信アンテナ１１からの検波出力信号が受
信アンテナ１２からの検波出力信号よりもハイレベルで
あると判定して選択信号をアンテナ切換回路４０に供給
する場合、受信アンテナ１１と第１系統２０のチューナ
ー部２１とを接続状態とし、受信アンテナ１２と第２系
統３０のチューナー部３１とを接続状態にする。The antenna switching circuit 40 connects the receiving antennas 11 and 12 to the tuners 21 and 31 of the systems 20 and 30 according to the selection signal. For example, the comparison detection circuit 5
In 0, when it is determined that the detection output signal from the reception antenna 11 is higher than the detection output signal from the reception antenna 12 and the selection signal is supplied to the antenna switching circuit 40, the reception antenna 11 and the first system 20 The tuner section 21 of the second system 30 is connected, and the receiving antenna 12 and the tuner section 31 of the second system 30 are connected.
【００２４】また、比較検出回路５０において、受信ア
ンテナ１１からの検波出力信号が受信アンテナ１２から
の検波出力信号よりもローレベルであると判定して選択
信号をアンテナ切換回路４０に供給する場合、受信アン
テナ１１と第２系統３０のチューナー部３１とを接続状
態とし、受信アンテナ１２と第１系統２０のチューナー
部２１とを接続状態とする。When the comparison detection circuit 50 determines that the detection output signal from the reception antenna 11 is lower than the detection output signal from the reception antenna 12 and supplies the selection signal to the antenna switching circuit 40, The receiving antenna 11 and the tuner section 31 of the second system 30 are connected, and the receiving antenna 12 and the tuner section 21 of the first system 20 are connected.
【００２５】つまり、検波出力信号がよりハイレベルで
あると判定された受信アンテナは、第１系統２０のチュ
ーナー部２１に常時接続され、検波出力信号がよりロー
レベルであると判定された他方の受信アンテナは、第２
系統３０のチューナー部３１に常時接続される。この
際、第１系統２０は受信状態の良好な受信アンテナから
の変調信号をステレオ復調回路６０を介して、Ｌチャン
ネル端子７１及びＲチャンネル端子７２からスピーカー
（図示せず）に出力し、第２系統３０は他方の受信アン
テナからの変調信号の受信状態をモニターする。That is, the receiving antenna whose detection output signal is determined to be at a higher level is always connected to the tuner section 21 of the first system 20, and the other receiving antenna whose detection output signal is determined to be at a lower level. The receiving antenna is the second
It is always connected to the tuner section 31 of the system 30. At this time, the first system 20 outputs the modulated signal from the reception antenna having a good reception state from the L channel terminal 71 and the R channel terminal 72 to the speaker (not shown) via the stereo demodulation circuit 60, and the second system The system 30 monitors the reception state of the modulated signal from the other receiving antenna.
【００２６】上記のように構成された本発明のダイバシ
ティ装置によれば、各系統２０，３０のチューナー部２
１，３１のレベル差や特性を一致させる作業を必要とせ
ず、回路構成や回路調整も簡素化することができる。According to the diversity device of the present invention configured as described above, the tuner section 2 of each system 20, 30 is used.
It is possible to simplify the circuit configuration and the circuit adjustment without requiring the work of matching the level difference and the characteristics of 1, 31.
【００２７】尚、上記実施例においては受信アンテナの
数を２つとしたが、受信アンテナの数に応じて系統の受
信手段２０，３０の数を一致させれば、回路構成及び回
路調整のより一層の簡素化を図ることができる。In the above embodiment, the number of receiving antennas is two, but if the number of receiving means 20, 30 of the system is made to correspond to the number of receiving antennas, the circuit configuration and circuit adjustment will be further improved. Can be simplified.
【００２８】また、上記受信状態検出信号としては、シ
グナルメーター電圧、ノイズレベルの検出信号であって
も良い。Further, the reception state detection signal may be a signal meter voltage or a noise level detection signal.
【００２９】[0029]
【発明の効果】上記のように構成された本発明のダイバ
シティ受信装置によれば、送信局からの変調信号を受信
する複数の受信アンテナと、一つの受信アンテナから送
出される一つの変調信号を受信状態検出信号に変換して
送出する第１系統の受信手段と、他の受信アンテナから
送出される他の変調信号を受信状態検出信号に変換して
送出する一つ又は複数の第２系統の受信手段と、前記第
１系統の受信手段からの受信状態検出信号と前記第２系
統の受信手段からの受信状態検出信号を比較検知して選
択信号を送出する比較検知手段と、前記選択信号に応じ
てよりハイレベルの変調信号を受信する受信アンテナを
前記第１系統の受信手段に接続し、他の受信アンテナを
前記第２系統の受信手段に接続するアンテナ切換回路と
を備え、前記第１系統の受信手段で検波された検波出力
信号を出力するようにしたので、複数の受信アンテナが
受信する電波信号の感度状態を比較して、感度の最も良
好な受信アンテナに第１系統の受信手段を常時接続する
ようにアンテナ切換回路を操作して、ステレオ復調回路
を介してオーディオ出力を送出することにより、第１系
統の受信手段と複数の第２系統の受信手段内のチューナ
ー部のレベル差や特性を一致させる作業を必要とせず、
回路構成や回路調整も簡素化することができる。According to the diversity receiving apparatus of the present invention configured as described above, a plurality of receiving antennas for receiving modulated signals from a transmitting station and one modulated signal transmitted from one receiving antenna are provided. A first system of receiving means for converting into a reception state detection signal and transmitting the same, and one or a plurality of second systems of converting other modulated signals transmitted from other receiving antennas into a reception state detection signal for transmission. The receiving means, the comparing and detecting means for comparing and detecting the receiving state detection signal from the receiving means of the first system and the receiving state detection signal from the receiving means of the second system, and transmitting the selection signal, An antenna switching circuit that connects a receiving antenna for receiving a higher-level modulated signal to the receiving means of the first system and connects another receiving antenna to the receiving means of the second system. Since the detection output signal detected by the general receiving means is output, the sensitivity states of the radio signals received by the plurality of receiving antennas are compared, and the receiving means of the first system is selected as the receiving antenna with the best sensitivity. By operating the antenna switching circuit so as to always connect the audio output and transmitting the audio output through the stereo demodulation circuit, the level difference between the tuner section in the receiving means of the first system and the receiving means of the plurality of second systems. And work to match the characteristics is not required,
The circuit configuration and circuit adjustment can also be simplified.
【図１】本発明のダイバシティ受信装置の概略を示すブ
ロック図FIG. 1 is a block diagram showing an outline of a diversity receiver of the present invention.
【図２】従来のダイバシティ受信装置の概略を示すブロ
ック図FIG. 2 is a block diagram showing an outline of a conventional diversity receiver.
１１ 受信アンテナ １２ 受信アンテナ ２０ 第１系統の受信手段 ３０ 第２系統の受信手段 ４０ アンテナ切換回路 ５０ 比較検知手段（比較検出回路） 11 Receiving Antenna 12 Receiving Antenna 20 First System Receiving Means 30 Second System Receiving Means 40 Antenna Switching Circuit 50 Comparison Detection Means (Comparison Detection Circuit)
Claims (1)
受信アンテナと、一つの受信アンテナから送出される一
つの変調信号を受信状態検出信号に変換して送出する第
１系統の受信手段と、他の受信アンテナから送出される
他の変調信号を受信状態検出信号に変換して送出する一
つ又は複数の第２系統の受信手段と、前記第１系統の受
信手段からの受信状態検出信号と前記第２系統の受信手
段からの受信状態検出信号を比較検知して選択信号を送
出する比較検知手段と、前記選択信号に応じてよりハイ
レベルの変調信号を受信する受信アンテナを前記第１系
統の受信手段に接続し、他の受信アンテナを前記第２系
統の受信手段に接続するアンテナ切換回路とを備え、前
記第１系統の受信手段で検波された検波出力信号を出力
することを特徴とするダイバシティ受信装置。1. A plurality of receiving antennas for receiving modulated signals from a transmitting station, and a first system receiving means for converting one modulated signal transmitted from one receiving antenna into a reception state detection signal and transmitting it. , One or a plurality of second system receiving means for converting another modulated signal transmitted from another receiving antenna into a receiving state detection signal and transmitting the same, and a receiving state detection signal from the first system receiving means And a comparison detection means for comparing and detecting a reception state detection signal from the reception means of the second system and transmitting a selection signal, and a reception antenna for receiving a higher level modulated signal according to the selection signal. An antenna switching circuit that is connected to the receiving means of the system and connects another receiving antenna to the receiving means of the second system, and outputs the detection output signal detected by the receiving means of the first system. Tosu Diversity receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4176547A JPH0621858A (en) | 1992-07-03 | 1992-07-03 | Diversity receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4176547A JPH0621858A (en) | 1992-07-03 | 1992-07-03 | Diversity receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0621858A true JPH0621858A (en) | 1994-01-28 |
Family
ID=16015497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4176547A Pending JPH0621858A (en) | 1992-07-03 | 1992-07-03 | Diversity receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0621858A (en) |
-
1992
- 1992-07-03 JP JP4176547A patent/JPH0621858A/en active Pending
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