JPH0354924A - Diversity radio receiver - Google Patents
Diversity radio receiverInfo
- Publication number
- JPH0354924A JPH0354924A JP1191184A JP19118489A JPH0354924A JP H0354924 A JPH0354924 A JP H0354924A JP 1191184 A JP1191184 A JP 1191184A JP 19118489 A JP19118489 A JP 19118489A JP H0354924 A JPH0354924 A JP H0354924A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- signal
- antennas
- noise
- time
- 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 15
- 230000003111 delayed effect Effects 0.000 claims description 10
- 230000001934 delay Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000005070 sampling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
Landscapes
- Radio Transmission System (AREA)
Abstract
Description
【発明の詳細な説明】
く産業上の利用分野〉
本発明はダイバーシティラジオ受信機に係り、特にアン
テナ切り換え時におけるノイズの切り残しをなくすこと
ができるダイバーシティラジオ受信機に関する．
〈従来技術〉
ダイバーシティラジオ受信機は、指向性の異なる２本の
受信アンテナと、マルチパスノイズ検出回路と、アンテ
ナ切換回路を備え、マルチパスノイズが小さくなるよう
に受信アンテナを切り換えて放送電波を受信する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a diversity radio receiver, and more particularly to a diversity radio receiver that can eliminate uncut noise when switching antennas. <Prior art> A diversity radio receiver is equipped with two receiving antennas with different directivity, a multipath noise detection circuit, and an antenna switching circuit, and switches the receiving antennas to reduce multipath noise and transmits broadcast radio waves. Receive.
く発明が解決しようとする課題〉
かかるダイバーシティラジオ受信機においては、マルチ
パスノイズが大きくなったことを検出してからアンテナ
を切り換えるため、ノイズを完全になくすことができず
、ノイズの切り残しが生じる。Problems to be Solved by the Invention In such a diversity radio receiver, since the antenna is switched after detecting that multipath noise has become large, it is not possible to completely eliminate noise, and noise remains uncut. arise.
本発明の目的は、アンテナ切り換え時におけるノイズの
切り残しをなくすことができるダイバーシティラジオ受
信機を提供することである。An object of the present invention is to provide a diversity radio receiver that can eliminate uncut noise when switching antennas.
く課題を解決するための手段〉
上記課題は本発明においては，第１，第２のアンテナか
らの受信信号をそれぞれ遅延させる遅延手段と、遅延手
段からの一方の信弼を選択する選択回路と、マルチバス
ノイズを検出するノイズ検出部と、マルチパスノイズに
基づいて遅延手段から出力される２つの遅延信号のうち
一方を選択させる判断部とにより達成される。Means for Solving the Problem> The above problem is solved in the present invention by providing a delay means for respectively delaying the received signals from the first and second antennas, and a selection circuit for selecting one signal from the delay means. , a noise detection unit that detects multi-pass noise, and a determination unit that selects one of the two delayed signals output from the delay means based on the multi-path noise.
く作用〉
第ｌ、第２のアンテナにより受信された放送信号をそれ
ぞれ所定時間遅延し、現アンテナに応じた一方の遅延信
号を選択して出力すると共に、遅延前の第１、第２アン
テナの受信信号に含まれるマルチパスノイズを検出する
。そして、現アンテナのマルチパスノイズが大きくなっ
て，アンテナ切り換えの必要性が生じた時、他のアンテ
ナに切り換え、該他のアンテナに応じた遅延信号を選択
して出力する。この結果、マルチパスノイズ検出時刻か
ら前記遅延時間だけ遡ってアンテナが切り換えられるた
め、マルチパスノイズの切り残しが生じない。Function> The broadcast signals received by the first and second antennas are each delayed for a predetermined period of time, one of the delayed signals corresponding to the current antenna is selected and output, and the signals of the first and second antennas before the delay are output. Detect multipath noise included in the received signal. Then, when the multipath noise of the current antenna becomes large and it becomes necessary to switch the antenna, the antenna is switched to another antenna, and a delayed signal corresponding to the other antenna is selected and output. As a result, the antenna is switched back by the delay time from the multipath noise detection time, so that no multipath noise is left uncut.
く実施例〉
図は本発明のダイバーシティラジオ受信機のブロック図
であり、ｌｌａ，ｌｌｂは第１、第２のアンテナ、１２
ａ，１２ｂは第１、第２のフロントエンド、１３ａ，１
３ｂは第ｌ、第２の中間周波増幅器、１４ａ，１４ｂは
第１，第２の検波回路、１５ａ，１５ｂは第ｌ、第２の
ノイズ検出回路であり、それぞれ第１，第２アンテナの
受信信号（中間周波信号）に含まれるマルチパスノイズ
を検出する。尚、サフィックスａが付けられたブロック
は第１アンテナ側の回路であり、サフィノクスｂが付け
られたブロックは第２アンテナ側の回路である。Embodiment> The figure is a block diagram of a diversity radio receiver of the present invention, where lla and llb are the first and second antennas,
a, 12b are first and second front ends, 13a, 1
3b is the first and second intermediate frequency amplifiers, 14a and 14b are the first and second detection circuits, and 15a and 15b are the first and second noise detection circuits, which are used for reception of the first and second antennas, respectively. Detects multipath noise contained in a signal (intermediate frequency signal). Note that the blocks with the suffix a are the circuits on the first antenna side, and the blocks with the suffix b are the circuits on the second antenna side.
１６は第１、第２アンテナ側検波出力のＡＤ変換データ
を記憶するメモリ、ｌ７は２人力のデジタル・シグナル
・プロセッサ（ＤＳＰ）である。16 is a memory for storing AD conversion data of the detection outputs of the first and second antenna sides, and l7 is a two-manpower digital signal processor (DSP).
ＤＳＰは各検波出力をそれぞれ所定サンプリング周期で
ＡＤ変換してメモリ１６の第１，第２アンテナ側記憶部
１６ａ，１６ｂに記憶すると共に、該メモリに記憶され
た第１、第２アンテナ側の検波データを所定時間Ｔｄ遅
れて読み出し、所定サンプリング周期でＤＡ変換して出
力する。The DSP performs AD conversion on each detection output at a predetermined sampling period and stores it in the first and second antenna side storage sections 16a and 16b of the memory 16, and also performs AD conversion on each detection output at a predetermined sampling period. Data is read out with a delay of a predetermined time Td, DA-converted at a predetermined sampling period, and output.
１８はＤＳＰから出力されるＤＡ変換信号Ｓａ，ｓｂを
選択出力する選択回路、１９はノイズイキラー、２０は
マルチプレクサ（ステレオ復調回路）２１はマルチパス
ノイズに基づいてアンテナ切リ換え処理を行うアンテナ
切換判断回路、２２はマイコン構或の制御部である。制
御部２２は必要なパラメータ等を入力してＤＳＰを制御
すると共に、アンテナ切換判断回路２ｌからの指示に基
づいてＡＤ変換信号Ｓａ，Ｓｂの選択指令を出力する。18 is a selection circuit that selects and outputs the DA conversion signals Sa and sb output from the DSP, 19 is a noise equalizer, 20 is a multiplexer (stereo demodulation circuit), and 21 is an antenna that performs antenna switching processing based on multipath noise. The switching judgment circuit 22 is a control section having a microcomputer structure. The control unit 22 controls the DSP by inputting necessary parameters and the like, and also outputs a command to select the AD conversion signals Sa and Sb based on instructions from the antenna switching judgment circuit 2l.
次に，全体的動作を説明する。Next, the overall operation will be explained.
第１，第２のアンテナｌｌａ，ｌｌｂからの受信信号は
それぞれフロントエンド１２ａ，１２ｂで中間周波信号
に変換された後、中間周波増幅され、検波されてＤＳＰ
１７に入力される。ＤＳＰは，前述の如く、各検波出力
をＡＤ変換してメモリ１６に記憶すると共に、時間Ｔｄ
遅れてメモリから記憶データを読み出してＤＡ変換し、
ＤＡ変換出力Ｓａ，Ｓｂを出力する。すなわち，ＤＳＰ
１７は各アンテナの検波出力を時間Ｔｄ遅延する。Received signals from the first and second antennas lla and llb are converted into intermediate frequency signals by front ends 12a and 12b, respectively, and then intermediate frequency amplified, detected and sent to the DSP.
17. As mentioned above, the DSP performs AD conversion on each detection output and stores it in the memory 16.
After a delay, the stored data is read from the memory and converted from DA to
Outputs DA conversion outputs Sa and Sb. That is, DSP
17 delays the detection output of each antenna by a time Td.
選択回路１８は現在選択されているアンテナに応じたＤ
Ａ変換信号を選択する。例えば、現在アンテナエ１ａが
選択されているものとすれば、ＤＡ変換信号Ｓａを選択
し、この選択された信号に基づいて放送音声がスピーカ
から出力される。The selection circuit 18 selects D according to the currently selected antenna.
Select the A conversion signal. For example, if the antennae 1a is currently selected, the DA conversion signal Sa is selected, and broadcast audio is output from the speaker based on this selected signal.
以上と並行して、各ノイズ検出回路１５ａ，１５ｂは、
中間周波信号に含まれるマルチパスノイズを検出し、マ
ルチパスノイズレベルＭａ，Ｍｂを出力する。アンテナ
切換判断回路２１はマルチパスノイズレベルＭａ ，Ｍ
ｂを遅延時間と等しい時間Ｔｄ間隔で取り込み、該マル
チパスノイズレベルに基づいて、アンテナ切り換えの必
要性が生じたか判断する。例えば、現在選択しているア
ンテナ（アンテナｌｌａとする〉により受信された信号
に含まれるマルチパスノイズレベルＭａが設定値より大
きくなり、かつ他方のアンテナ信号に含まれるマルチパ
スノイズレベルＭｂより大きくなると、アンテナ切り換
えを制御部２２に指示する。In parallel with the above, each noise detection circuit 15a, 15b
Multipath noise contained in the intermediate frequency signal is detected and multipath noise levels Ma and Mb are output. The antenna switching judgment circuit 21 determines the multipath noise levels Ma, M
b at intervals of time Td equal to the delay time, and based on the multipath noise level, it is determined whether antenna switching is necessary. For example, if the multipath noise level Ma included in the signal received by the currently selected antenna (referred to as antenna lla) becomes larger than the set value, and also becomes larger than the multipath noise level Mb included in the other antenna signal, , instructs the control unit 22 to switch the antenna.
制御部２２は該指示によりアンテナ切換指令を発生し，
選択回路１８をして他方のアンテナｌｌｂに応じたＤＡ
変換信号Ｓａを選択出力させる。この結果、マルチパス
ノイズ検出時刻から遅延時間Ｔｄだけ遡ってアンテナ受
信信号が切り換えられるため、マルチパスノイズの切り
残しが生じない。The control unit 22 generates an antenna switching command based on the instruction,
The selection circuit 18 selects a DA corresponding to the other antenna llb.
The converted signal Sa is selectively output. As a result, the antenna reception signal is switched back by the delay time Td from the multipath noise detection time, so that no multipath noise is left uncut.
〈発明の効果〉
以上本発明によれば、第ｌ，第２のアンテナにより受信
された放送信号をそれぞれ所定時間遅延し、現アンテナ
に応じた一方の遅延信号を選択して出力すると共に、遅
延前の第１、第２アンテナの受信信号に含まれるマルチ
パスノイズを検出し、現在選択されているアンテナのマ
ルチパスノイズが大きくなって、アンテナ切り換えの必
要性が生じた時、他のアンテナに応じた遅延信号を選択
出力するように構成したから、マルチパスノイズ検出時
刻から遅延時間Ｔｄだけ遡ってアンテナが切り換えられ
るため、マルチバスノイズの切り残しが生じない。<Effects of the Invention> According to the present invention, the broadcast signals received by the first and second antennas are each delayed for a predetermined time, one of the delayed signals corresponding to the current antenna is selected and output, and the delayed signal is The multipath noise included in the received signals of the previous first and second antennas is detected, and when the multipath noise of the currently selected antenna becomes large and it becomes necessary to switch antennas, Since the antenna is configured to selectively output a corresponding delayed signal, the antenna is switched back by the delay time Td from the multipath noise detection time, so that no multipath noise is left uncut.
図は本発明に係るダイバーシティラジオ受信機のブロッ
ク図である。
１１ａ，１１ｂ・・第１、第２アンテナ１５ａ，工５ｂ
・・ノイズ検出回路
１６・・メモリ
１７・・ＤＳＰ
１８・・選択回路
２１・・アンテナ切換判断回路The figure is a block diagram of a diversity radio receiver according to the present invention. 11a, 11b...first and second antennas 15a, 5b
... Noise detection circuit 16 ... Memory 17 ... DSP 18 ... Selection circuit 21 ... Antenna switching judgment circuit
Claims (1)
ぞれ所定時間遅延させる遅延手段と、第１、第２アンテ
ナに応じた遅延信号のうち一方を選択出力する選択回路
と、第１、第２アンテナにより受信された放送信号に含
まれるマルチパスノイズを検出するノイズ検出部と、マ
ルチパスノイズに基づいて遅延手段から出力される２つ
の遅延信号のうち一方を選択させる判断部とを有するこ
とを特徴とするダイバーシティラジオ受信機。a delay means for delaying broadcast signals received by the first and second antennas by a predetermined time, respectively; a selection circuit for selectively outputting one of the delayed signals corresponding to the first and second antennas; The present invention includes a noise detection unit that detects multipath noise included in a broadcast signal received by an antenna, and a determination unit that selects one of two delayed signals output from the delay means based on the multipath noise. Features a diversity radio receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1191184A JPH0354924A (en) | 1989-07-24 | 1989-07-24 | Diversity radio receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1191184A JPH0354924A (en) | 1989-07-24 | 1989-07-24 | Diversity radio receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0354924A true JPH0354924A (en) | 1991-03-08 |
Family
ID=16270299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1191184A Pending JPH0354924A (en) | 1989-07-24 | 1989-07-24 | Diversity radio receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0354924A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6310727A (en) * | 1986-04-16 | 1988-01-18 | ペルストルプ アクティエボラーグ | Medicinal composition containing inositol triphosphate |
-
1989
- 1989-07-24 JP JP1191184A patent/JPH0354924A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6310727A (en) * | 1986-04-16 | 1988-01-18 | ペルストルプ アクティエボラーグ | Medicinal composition containing inositol triphosphate |
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