JPS6342970B2 - - Google Patents
Info
- Publication number
- JPS6342970B2 JPS6342970B2 JP56143554A JP14355481A JPS6342970B2 JP S6342970 B2 JPS6342970 B2 JP S6342970B2 JP 56143554 A JP56143554 A JP 56143554A JP 14355481 A JP14355481 A JP 14355481A JP S6342970 B2 JPS6342970 B2 JP S6342970B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- receivers
- detection
- outputs
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 15
- 230000004044 response Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/18—Automatic scanning over a band of frequencies
- H03J7/183—Automatic scanning over a band of frequencies combined with selection between different stations transmitting the same programm, e.g. by analysis of the received signal strength
- H03J7/186—Automatic scanning over a band of frequencies combined with selection between different stations transmitting the same programm, e.g. by analysis of the received signal strength using two or more tuners
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
- H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
- H04H60/11—Arrangements for counter-measures when a portion of broadcast information is unavailable
- H04H60/12—Arrangements for counter-measures when a portion of broadcast information is unavailable wherein another information is substituted for the portion of broadcast information
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Circuits Of Receivers In General (AREA)
Description
【発明の詳細な説明】
本発明は、同一番組追跡システムに関し、更に
詳細には、自動車等の移動体に於いて、同一番組
を送出する複数の局を移動するに従つて選択し最
良の受信状態を維持する同一番組追跡システムに
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a same program tracking system, and more particularly, the present invention relates to a same program tracking system, and more particularly, in a moving body such as a car, a plurality of stations transmitting the same program are selected as the station moves, and the best reception is achieved. This invention relates to a same program tracking system that maintains status.
自動車、船舶、又は航空機等で移動しながら放
送電波を受信する場合、例えば第１図の地点Ａか
ら地点Ｂへ向つて車で走行し放送を受信する場合
には、移動地点の夫々において送出電波の状況が
変化することになる。放送局１〜７がすべて同一
の番組を同時に送出しているとき、地点Ａを出発
した聴取者は放送局１に同調すれば放送番組を受
信することができるが、地点Ｃに近づくに従つて
受信状態は悪化し、更に進んで地点Ｄ迄くると、
こゝでは既に放送局１のサービスエリアから外れ
てしまい、放送局１の送出周波数に同調させてい
たのでは受信不可能になつてしまう。従つて、引
き続き同一番組の受信を希望する場合には、改め
て放送局２に同調し直し同一番組が送出されてい
ることを確認した上で受信局を変更しなければな
らない。このような操作は聴取者が運転者である
場合、特に面倒であり、また注意が散慢になると
いう点で危険性がある。 When receiving broadcast radio waves while moving in a car, ship, or aircraft, for example, when receiving broadcast waves while driving from point A to point B in Figure 1, the transmitted radio waves are transmitted at each moving point. The situation will change. When all broadcast stations 1 to 7 are transmitting the same program at the same time, a listener who departs from point A can receive the broadcast program by tuning to broadcast station 1, but as he approaches point C, The reception condition worsened, and as we continued further and reached point D,
At this point, it is already out of the service area of broadcasting station 1, and if it were tuned to the transmission frequency of broadcasting station 1, it would be impossible to receive it. Therefore, if the user wishes to continue receiving the same program, he or she must re-tune to broadcasting station 2 and confirm that the same program is being broadcast before changing the receiving station. Such operations are particularly troublesome when the listener is a driver, and there is a danger that the listener may become distracted.
第１図の地点Ｅに至つたような場合、放送局４
からの電波が最強であるにもかゝわらず、放送局
３のサービスエリア内にある為に、聴取者は依然
として弱いレベルの放送局３からの電波を受信し
続けることにもなる。 When reaching point E in Figure 1, broadcasting station 4
Even though the radio waves from Broadcasting Station 3 are the strongest, the listeners will continue to receive the radio waves from Broadcasting Station 3 at a weak level because it is within the service area of Broadcasting Station 3.
また、第１図地点Ｆのような場合には、放送局
５，６及び７のサービスエリアが重複する為、最
強レベルの局は刻々と変化し、付近に障害物があ
る場合にはマルチパス歪を生じる。 In addition, in a case like point F in Figure 1, the service areas of broadcasting stations 5, 6, and 7 overlap, so the station with the strongest level changes every moment, and if there are obstacles nearby, multipath Causes distortion.
本発明は、以上の欠点に鑑み、同一番組を送出
する複数の局のサービスエリアに亘つて移動する
とき、常に最強レベルの局を自動的に選択して受
信し得る同一番組追跡システムを提供することを
目的とする。 In view of the above drawbacks, the present invention provides a same program tracking system that can always automatically select and receive the station with the highest level when moving across the service areas of a plurality of stations transmitting the same program. The purpose is to
本発明を以下実施例に従つて詳細に説明する。 The present invention will be described in detail below with reference to Examples.
第２図は本発明による同一番組追跡システムの
実施例を示すブロツク図である。第２図におい
て、分配器１２は、アンテナ１１より入つた電波
を受信機１３及び１４に配分する。バンド・パ
ス・フイルタ１５及び１６は受信機１３及び１４
の夫々の検波出力S1及びS2の比較に適する周波数
成分のみを通過させる。減算回路１７はバンド・
パス・フイルタ１５の出力からバンド・パス・フ
イルタ１６の出力を差引いた（S1−S2）をアンプ
１９に供給し、加算回路１８はバンド・パス・フ
イルタ１５及び１６の出力を加算して（S1＋S2）
をアンプ２０に供給する。除算回路２１は整流回
路２２によつて両波整流（ピーク検出）された
（S1＋S2）成分で、減算回路１７の出力信号（S1
−S2）を除算するもので、アンプ１９及び２０は
その除算を精度よく行うために適当なレベルに増
幅する。 FIG. 2 is a block diagram showing an embodiment of the same program tracking system according to the present invention. In FIG. 2, a distributor 12 distributes radio waves received from an antenna 11 to receivers 13 and 14. Band pass filters 15 and 16 are connected to receivers 13 and 14.
Only frequency components suitable for comparison of the respective detection outputs S 1 and S 2 are passed. The subtraction circuit 17 is a band
The output of the band pass filter 16 is subtracted from the output of the pass filter 15 (S 1 −S 2 ) and is supplied to the amplifier 19, and the adder circuit 18 adds the outputs of the band pass filters 15 and 16. (S 1 + S 2 )
is supplied to the amplifier 20. The divider circuit 21 receives the (S 1 +S 2 ) component that has been double-wave rectified (peak detected) by the rectifier circuit 22 and the output signal (S 1 +S 2 ) of the subtracter circuit 17 .
-S 2 ), and the amplifiers 19 and 20 amplify it to an appropriate level in order to perform the division with high precision.
整流回路２３は除算回路２１の出力を両波整流
して、判定出力回路２４に送り、該判定出力回路
はS1とS2が同一の内容か否かを判定してその結果
を制御回路２６に供給する。制御回路２６は判定
出力回路２４に応答して切換回路２５を制御し、
受信機の検波出力S1又はS2のいずれかを、アンプ
２８を介してオーデイオ信号として出力する。メ
モリ２７は同一番組を送出している局を記憶する
ためのものである。 The rectifier circuit 23 double-wave rectifies the output of the divider circuit 21 and sends it to the determination output circuit 24, which determines whether S 1 and S 2 have the same content and sends the result to the control circuit 26. supply to. The control circuit 26 controls the switching circuit 25 in response to the determination output circuit 24,
Either the detection output S 1 or S 2 of the receiver is outputted as an audio signal via the amplifier 28 . The memory 27 is for storing stations broadcasting the same program.
以上の構成により、本発明は次の様に動作す
る。 With the above configuration, the present invention operates as follows.
受信機１３又は１４のうちの一方は常に周波数
スキヤンするように制御回路２６によつてコント
ロールされる。例えば、受信機１３が設定された
ある局に同調する固定受信機とすると、受信機１
４はその固定された周波数以外の局に同調するよ
う順次周波数を切換えて走査する。そして、各同
調周波数毎に受信機１３の検波出力との比較が行
なわれる。 One of the receivers 13 or 14 is controlled by a control circuit 26 to always perform frequency scanning. For example, if receiver 13 is a fixed receiver tuned to a certain station, receiver 1
4 scans by sequentially switching frequencies so as to tune to stations other than the fixed frequency. Then, a comparison is made with the detection output of the receiver 13 for each tuned frequency.
いずれかの局に同調して受信機１３が検波出力
S1を送出するとき、いずれかの他局に同調する受
信機１４が検波出力S2を送出すると、各出力信号
S1及びS2は、バンド・パス・フイルタ１５及び１
６を夫々通過して、減算回路１７及び加算回路１
８に供給される。減算回路１７の出力は、受信機
１３と１４が受信している番組が同じか否かによ
つて変化する。即ち、２台の受信機が同一の番組
を受信している場合、各検波出力は相似となり、
レベルは非常に減少するが、異なつた番組を受信
している場合にはレベルの減少は無いか、あるい
はあつたとしても微少時間で、その発生はランダ
ムであると考えられる。従つて、減算回路１７の
出力レベルによつて、２台の受信機が受信してい
る番組が同一か否かを判定することができる。 The receiver 13 tunes to any station and outputs a detected signal.
When transmitting S 1 , if the receiver 14 tuned to any other station transmits the detection output S 2 , each output signal
S 1 and S 2 are band pass filters 15 and 1
6, the subtraction circuit 17 and the addition circuit 1
8. The output of the subtraction circuit 17 changes depending on whether the programs being received by the receivers 13 and 14 are the same. In other words, when two receivers are receiving the same program, each detection output will be similar,
The level decreases significantly, but if a different program is being received, the level does not decrease, or even if it does, it only occurs for a very short time and its occurrence is thought to be random. Therefore, depending on the output level of the subtraction circuit 17, it can be determined whether the programs being received by the two receivers are the same.
しかし、この判定の精度は、受信電波の変調度
によつて影響を受ける可能性がある。例えば、あ
る時点での検波出力がS1＝100，S2＝90とすると
減算回路１７の出力はS1−S2＝100−90＝10とな
る。次の瞬間の受信電波の変調度が変化し（信号
の振幅が変化する）、検波出力が例えばS′1＝10，
S′2＝９となると、減算回路１７の出力はS′1−S′2
＝10−９＝１となつてしまい同一性の判定が困難
になる。本発明によれば、減算回路の出力を加算
回路の出力で除算することによつて、前記例によ
ればS1−S2／S1＋S2＝１／190＝１／19＝S′1−S′2／S
′1＋S′2となつて、
受信電波の変調度の影響を除去することができ
る。第２図に示す実施例においては、加算回路１
８の出力を整流回路２２によつて両波整流（ピー
ク検出）して除算をDC的にコントロールし、変
調度によつて判定が影響されることを防止してい
る。この除算が行なわれた後、判定出力回路２４
は、２台の受信機が受信している番組が同じか否
かを、論理１又は０信号により制御回路２６に送
出する。 However, the accuracy of this determination may be affected by the degree of modulation of the received radio waves. For example, if the detection outputs at a certain point in time are S1 =100 and S2 =90, the output of the subtraction circuit 17 will be S1 - S2 =100-90=10. The modulation degree of the received radio wave changes at the next moment (the amplitude of the signal changes), and the detection output becomes, for example, S′ 1 = 10,
When S′ 2 =9, the output of the subtraction circuit 17 is S′ 1 −S′ 2
=10-9=1, making it difficult to determine identity. According to the invention, by dividing the output of the subtraction circuit by the output of the addition circuit, according to the example, S 1 −S 2 /S 1 +S 2 =1/190=1/19=S′ 1 −S′ 2 /S
′ 1 +S′ 2 , and the influence of the modulation degree of the received radio waves can be removed. In the embodiment shown in FIG.
The output of 8 is subjected to double-wave rectification (peak detection) by the rectifier circuit 22 to control the division in a DC manner, thereby preventing the judgment from being influenced by the degree of modulation. After this division is performed, the judgment output circuit 24
sends a logic 1 or 0 signal to the control circuit 26 to determine whether the programs being received by the two receivers are the same.
制御回路２６は、判定出力回路２４の出力が同
一番組であることを表わす信号の場合には、受信
レベルが大きい局の方を受信している受信機１３
又は１４の検波出力を切換回路２５により切換え
て出力端子２９に供給する。このとき、メモリ２
７には周波数スキヤンされた結果同一番組を送出
している局が記憶されており、その中の一番強い
レベルの局が最終的に選択されるよう制御され
る。 If the output of the determination output circuit 24 is a signal indicating that the program is the same, the control circuit 26 controls the receiver 13 that is receiving the station with the higher reception level.
Alternatively, the detection outputs of 14 are switched by the switching circuit 25 and supplied to the output terminal 29. At this time, memory 2
7 stores stations transmitting the same program as a result of frequency scanning, and control is performed so that the station with the strongest level among them is finally selected.
判定出力回路２４の出力が異なる番組であるこ
とを表わす信号の場合には、制御回路２６は受信
機１４の同調周波数を次の局のものに変更させ
て、以上の動作を繰り返す。 If the output of the determination output circuit 24 is a signal indicating a different program, the control circuit 26 changes the tuned frequency of the receiver 14 to that of the next station, and repeats the above operation.
以上の如く、本発明の同一番組追跡システムに
よれば、同一番組を送出する複数の局のサービス
エリアを自動車等で移動しながら、同一番組を自
動的に最良の状態に維持しながら受信することが
できる。これにより、従来、移動するに従つて毎
回調整しなければならない煩らわしさを除去する
ことが可能となる。また、第２図に例示した分配
器を使用せず、アンテナをあるスペース離した２
本設けることにより前述のマルチパス歪をより軽
減することも可能である。 As described above, according to the same program tracking system of the present invention, it is possible to receive the same program while automatically maintaining it in the best condition while moving in a car or the like through the service areas of multiple stations transmitting the same program. I can do it. This makes it possible to eliminate the conventional trouble of having to make adjustments every time the device is moved. In addition, without using the distributor illustrated in Fig. 2, two antennas can be placed a certain distance apart.
By providing this, it is also possible to further reduce the multipath distortion described above.
第１図は本発明の目的を説明する図、第２図
は、本発明による同一番組追跡システムの一実施
例を示すブロツク図である。
FIG. 1 is a diagram for explaining the purpose of the present invention, and FIG. 2 is a block diagram showing an embodiment of the same program tracking system according to the present invention.
Claims (1)
算回路と、 前記２台の受信機の検波出力の和を出力する加
算回路と、 前記減算回路の出力を前記加算回路の出力で除
算する除算回路と、 前記除算回路の出力により前記２台の受信機の
検波出力の内容が同一か否かを判定する判定回路
と、 前記判定回路に応答して、前記２台の受信機の
検波出力が同一内容のとき受信レベルの大きい方
の受信機の検波出力を送出させる制御回路と、 から構成される同一番組追跡システム。 ２ 前記２台の受信機の一方が、前記制御回路に
よつて、同調周波数を順次切換えて前記判定回路
による判定動作を行うよう制御されるところの特
許請求の範囲第１項記載の同一番組追跡システ
ム。[Scope of Claims] 1. Two receivers; a subtraction circuit that outputs the difference between the detection outputs of the two receivers; and an addition circuit that outputs the sum of the detection outputs of the two receivers; a division circuit that divides the output of the subtraction circuit by the output of the addition circuit; a determination circuit that determines whether the contents of the detection outputs of the two receivers are the same based on the output of the division circuit; and the determination circuit. and a control circuit for transmitting the detection output of the receiver having a higher reception level when the detection outputs of the two receivers have the same content in response to the detection output of the two receivers. 2. The same program tracking according to claim 1, wherein one of the two receivers is controlled by the control circuit to sequentially switch the tuning frequency and perform the judgment operation by the judgment circuit. system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14355481A JPS5846737A (en) | 1981-09-11 | 1981-09-11 | Tracking system for same program |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14355481A JPS5846737A (en) | 1981-09-11 | 1981-09-11 | Tracking system for same program |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5846737A JPS5846737A (en) | 1983-03-18 |
| JPS6342970B2 true JPS6342970B2 (en) | 1988-08-26 |
Family
ID=15341436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14355481A Granted JPS5846737A (en) | 1981-09-11 | 1981-09-11 | Tracking system for same program |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5846737A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5850841A (en) * | 1981-09-21 | 1983-03-25 | Clarion Co Ltd | Identical broadcast receiver |
| JPS6460115A (en) * | 1987-08-31 | 1989-03-07 | Fujitsu Ten Ltd | Rds radio receiver |
| JPH02114727A (en) * | 1988-10-25 | 1990-04-26 | Nec Corp | Receiver |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54137212A (en) * | 1978-04-18 | 1979-10-24 | Clarion Co Ltd | Channel selection control system for synthesizer receiver |
| JPS5689123A (en) * | 1979-11-20 | 1981-07-20 | Philips Nv | Radio receiver |
-
1981
- 1981-09-11 JP JP14355481A patent/JPS5846737A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54137212A (en) * | 1978-04-18 | 1979-10-24 | Clarion Co Ltd | Channel selection control system for synthesizer receiver |
| JPS5689123A (en) * | 1979-11-20 | 1981-07-20 | Philips Nv | Radio receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5846737A (en) | 1983-03-18 |
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