JP2509964Y2 - Car TV Diversity-Receiver - Google Patents
Car TV Diversity-ReceiverInfo
- Publication number
- JP2509964Y2 JP2509964Y2 JP9829190U JP9829190U JP2509964Y2 JP 2509964 Y2 JP2509964 Y2 JP 2509964Y2 JP 9829190 U JP9829190 U JP 9829190U JP 9829190 U JP9829190 U JP 9829190U JP 2509964 Y2 JP2509964 Y2 JP 2509964Y2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- receiving
- signal
- television
- diversity
- 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 - Lifetime
Links
Description
【考案の詳細な説明】 [産業上の利用分野] 本考案は車載用の受信装置にかかわり、詳しくは、複
数のアンテナと受信回路を備え、信号中に含まれる歪が
少なく、S/N比のよい方の受信回路から信号を選択し出
力にとりだす信号切換方式のダイバシティー受信機に関
する。[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a vehicle-mounted receiving device, and more specifically, it is equipped with a plurality of antennas and a receiving circuit, has a small distortion contained in a signal, and has an S / N ratio. The present invention relates to a signal-switching type diversity receiver that selects a signal from the better receiving circuit and outputs it to the output.
[従来の技術] 移動する車両において電波を受信するとき、電波の到
来方向に障害物が存在する場合や反射波による干渉が存
在する場合など、到来電波の条件により安定に受信でき
ないことがある。[Prior Art] When receiving a radio wave in a moving vehicle, stable reception may not be possible depending on the conditions of the incoming radio wave, such as when there is an obstacle in the arrival direction of the radio wave or when interference due to a reflected wave exists.
そこで、従来から車載用受信機では指向性の異なる複
数のアンテナを車両の適宜な箇所に配設し、最も受信条
件の良好なアンテナを切換選択して受信するようにした
ダイバシティー受信装置が搭載される。Therefore, conventionally, a vehicle-mounted receiver is equipped with a diversity receiving device in which a plurality of antennas having different directivities are arranged at appropriate positions of the vehicle, and the antenna with the best reception condition is switched and selected for reception. To be done.
[考案が解決しようとする課題] 上記ダイバシティー受信機能を有する車載用AVシステ
ムにおいて、特にテレビ受像機は垂直ブランキング期間
内にアンテナ切換を行ない、車両走行中でも安定な受信
ができるよう工夫されているが、例えば、車両がビルの
谷間を移動中のように受信条件が最悪になったときはア
ンテナが頻繁に切り換わるため、切換時に発生するノイ
ズによって画像が乱れ、またアンテナ切換ごとにバズ音
が生じ音声信号の品質も同時に劣化させるなど、実用上
の問題があった。[Problems to be Solved by the Invention] In the above-described vehicle-mounted AV system having the diversity reception function, the television receiver is designed so that the antennas can be switched during the vertical blanking period to ensure stable reception even while the vehicle is running. However, for example, when the vehicle is moving in a valley of a building and the reception conditions become the worst, the antennas frequently switch, so the noise generated at the time of switching causes the image to be disturbed, and a buzzing noise occurs at each switching of antennas. Occurs, and the quality of the audio signal is also deteriorated, which is a practical problem.
ところで、映像モニター装置が車両ドライバーに向け
て設置された場合は、安全運転の原則から車両走行中は
モニターに画像が映出されないよう考慮されている機器
があり、当然のことながら車両走行中においてテレビを
受信するときは音声信号のみを受信するようにしてい
る。By the way, when the video monitor device is installed toward the vehicle driver, there are devices that are considered not to display an image on the monitor while the vehicle is traveling, as a principle of safe driving. When receiving television, only the audio signal is received.
しかしながら、テレビ音声信号の受信時は映像信号回
路が動作しており、アンテナ切換時に発生するバズ音が
音声信号回路に回り込み、高品質の音声信号を受信でき
ないという問題もある。However, the video signal circuit is operating when receiving the television audio signal, and the buzz sound generated at the time of switching the antenna sneaks into the audio signal circuit, which causes a problem that a high-quality audio signal cannot be received.
本考案は上記事情に鑑みなされたもので、テレビとFM
受信機からなる車載用AVシステムにおいて、テレビの音
声信号をFM受信機の出力音声信号と同様に高品質の受信
が可能の車載用ダイバシティー受信機を提供することを
目的とする。The present invention has been made in view of the above circumstances, and has
It is an object of the present invention to provide a vehicle-mounted diversity receiver capable of receiving a high-quality reception of a television audio signal as an output audio signal of an FM receiver in an in-vehicle AV system including a receiver.
[課題を解決するための手段] 上記目的を達成するために、本考案による車載用テレ
ビのダイバシティー受信機では、テレビ放送を受信する
テレビ受信回路と、該テレビ放送の音声信号とFM放送電
波の両方を受信可能の第1のFM受信回路と、FM放送帯の
電波を受信する第2のFM受信回路と、上記テレビ受信回
路と第1のFM受信回路を同一受信周波数に設定して受信
を行ない該受信回路出力を比較していずれか一方の受信
回路を切換選択するテレビ音声ダイバシティー回路と、
上記第1及び第2のFM受信回路を同一受信周波数に設定
して受信を行ない該受信回路の出力を比較していずれか
一方の受信回路出力を切換選択するFMダイバシティー回
路とを備えている。[Means for Solving the Problems] In order to achieve the above object, in a diversity receiver of a vehicle-mounted television according to the present invention, a television receiving circuit for receiving a television broadcast, an audio signal of the television broadcast, and an FM broadcast radio wave are provided. The first FM receiving circuit that can receive both, the second FM receiving circuit that receives radio waves in the FM broadcast band, and the television receiving circuit and the first FM receiving circuit set to the same receiving frequency and receive And a television audio diversity circuit that compares the outputs of the receiving circuits and switches and selects one of the receiving circuits.
And an FM diversity circuit that sets the first and second FM reception circuits to the same reception frequency, performs reception, compares the outputs of the reception circuits, and switches and selects one of the reception circuit outputs. .
[作用] テレビ受信回路と第1及び第2のFM受信回路は、それ
ぞれ中間周波数増幅回路を備え、これら中間周波数増幅
回路から信号の一部を取り出し、信号中に含まれる歪と
ノイズ成分を抑圧した残余の差信号が生成される。[Operation] The television receiving circuit and the first and second FM receiving circuits each include an intermediate frequency amplifying circuit, take out a part of the signal from these intermediate frequency amplifying circuits, and suppress distortion and noise components contained in the signal. A residual difference signal is generated.
テレビの音声信号を受信する場合は、テレビ音声受信
回路とテレビ音声を受信可能の第1のFM受信回路から上
記差信号が出力され、テレビ音声ダイバシティー回路に
おいて上記差信号のレベルが比較される。比較結果より
上記テレビ受信回路と第1FM受信回路のうち、信号中に
含まれる歪とノイズ成分の少ない側の受信回路がテレビ
音声ダイバシティー回路によって切換選択された後、復
調出力を得る。When receiving the audio signal of the TV, the difference signal is output from the TV audio receiving circuit and the first FM receiving circuit capable of receiving the TV audio, and the levels of the difference signal are compared in the TV audio diversity circuit. . From the comparison result, the demodulated output is obtained after the television audio diversity circuit switches and selects the one of the television receiving circuit and the first FM receiving circuit that has the less distortion and noise components contained in the signal.
従って、車両の走行中において、上記2つのテレビ音
声受信回路のうち、アンテナ入力条件の良好な側の受信
回路出力が選択される。また、FM電波を受信するとき
は、同様に第1及び第2のFM受信回路のうち、アンテナ
入力条件の良好な側の受信回路出力がFMダイバシティー
回路によって切換選択される。Therefore, while the vehicle is running, the receiving circuit output on the side with the better antenna input condition is selected from the two television audio receiving circuits. Further, when receiving the FM radio wave, similarly, the output of the receiving circuit of the first and second FM receiving circuits on the side with favorable antenna input conditions is switched and selected by the FM diversity circuit.
[実施例] 以下、本考案の実施例を図面を参照して説明する。第
1図はテレビとFMの2つの受信系統から構成された車載
用AVシステムのブロック図である。なお、本ブロック図
は車両の走行中に機能する各回路の構成のみを示すもの
で、停車時に機能する回路部分については省略してあ
る。Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an in-vehicle AV system composed of two receiving systems of a TV and an FM. It should be noted that this block diagram shows only the configuration of each circuit that functions while the vehicle is traveling, and the circuit portion that functions when the vehicle is stopped is omitted.
図において、10はテレビ受信用のアンテナであり、車
両走行中はアンテナ切換用ダイバシティー機能(図示な
し)により単一のアンテナが選択され固定された状態を
表わしている。12は受信波を選択するTVチューナで、5
8.75M Hzの映像搬送波と、54.25M Hzの音声搬送波信号
を出力する。13は映像中間周波数増幅回路で、上記58.7
5M Hz信号を増幅する。14はビデオ増幅回路で、この出
力はモニター装置に供給され、モニターに受信された映
像を映出するが、車両走行中は機能しない。In the figure, reference numeral 10 denotes a television receiving antenna, which represents a state in which a single antenna is selected and fixed by a diversity function for antenna switching (not shown) while the vehicle is traveling. 12 is a TV tuner for selecting the received wave, 5
It outputs 8.75MHz video carrier and 54.25MHz audio carrier signal. 13 is a video intermediate frequency amplifier circuit, which has the above 58.7
Amplifies a 5M Hz signal. Reference numeral 14 is a video amplifier circuit, the output of which is supplied to the monitor device and displays the image received by the monitor, but does not function while the vehicle is running.
次に、15は上記54.25M Hzの音声搬送波入力信号を10.
7M Hzにビートダウンする周波数変換器である。そし
て、16は10.7M Hzの中間周波数信号を増幅する回路で、
出力端子16bに増幅及び帯域制限された信号を出力する
とともに、端子16aに次段のテレビ音声ダイバシティー
回路17に入力する差信号を出力する。この差信号は選択
度特性の良好なSメータ出力電圧の一部を利用したもの
で、Sメータ回路から取り出された電圧がフィルタを通
過するとき、信号中に含まれる歪とノイズ成分が抑圧さ
れ主要成分のみが検波されて出力端子16aに出力する。Next, 15 is the audio carrier input signal of 54.25 MHz above 10.
It is a frequency converter that beats down to 7M Hz. 16 is a circuit that amplifies the intermediate frequency signal of 10.7 MHz,
The amplified and band-limited signal is output to the output terminal 16b, and the difference signal to be input to the television audio diversity circuit 17 of the next stage is output to the terminal 16a. This difference signal uses a part of the S-meter output voltage having a good selectivity characteristic. When the voltage taken out from the S-meter circuit passes through the filter, distortion and noise components contained in the signal are suppressed. Only the main component is detected and output to the output terminal 16a.
テレビ音声ダイバシティー回路17は2系統の中間周波
数信号の質を比較し、質の良好な一方の信号を選択的に
切り換えて出力する信号切換器である。このダイバシテ
ィー回路17は、テレビ音声中間周波数信号とFM中間周波
数信号の2系統の信号が入力する端子17a,17bと、差信
号入力端子17d,17eに入力する上記2系統の差信号レベ
ルを比較する比較器と、該比較結果によりいずれか一方
の中間周波数信号を選択する切換スイッチと、選択され
た信号を次段の復調器18に送出する出力端子17cの各回
路が含まれている。The television audio diversity circuit 17 is a signal switcher for comparing the qualities of the two systems of intermediate frequency signals and selectively switching and outputting one of the signals of good quality. This diversity circuit 17 compares terminals 17a and 17b to which signals of two systems of a TV audio intermediate frequency signal and an FM intermediate frequency signal are input with the difference signal levels of the above two systems to be input to difference signal input terminals 17d and 17e. A comparator, a changeover switch for selecting one of the intermediate frequency signals according to the comparison result, and an output terminal 17c for sending the selected signal to the demodulator 18 at the next stage.
次に、本考案の受信機は第1と第2のFM受信回路を備
え、このうち第1の受信回路はテレビ音声信号が受信で
きるよう、受信周波数帯域がVHF帯まで拡張されたRF部
を有している。図において、20,21は受信アンテナ、22
はチューナ回路、そして、23,24は中間周波数増幅回路
である。チューナ22において、22aは第1の受信回路
で、FM周波数帯とテレビ周波数帯が受信可能範囲にあ
る。また、FMチューナ22bはFM帯をカバーする通常のFM
ラジオと同一規格のものである。Next, the receiver of the present invention comprises first and second FM receiver circuits, of which the first receiver circuit has an RF section whose reception frequency band is extended to the VHF band so that a television audio signal can be received. Have In the figure, 20 and 21 are receiving antennas and 22
Are tuner circuits, and 23 and 24 are intermediate frequency amplifier circuits. In the tuner 22, 22a is a first receiving circuit, and the FM frequency band and the television frequency band are within the receivable range. Also, the FM tuner 22b is a normal FM that covers the FM band.
It has the same standard as the radio.
23は第1受信回路の中間周波数信号を増幅し出力端子
23bに帯域制限された信号を出力するとともに、出力端
子23aに差信号を出力する。この差信号はテレビ音声中
間周波数増幅回路16と同様にして信号中に含まれる歪と
ノイズ成分が抑圧された残余の主要成分を出力する回路
により生成される。24は上述した中間周波数信号増幅回
路23とほぼ同一仕様の回路で、第2FM受信回路の中間周
波数信号を出力する端子24bと、差信号出力端子24aを備
えている。23 is an output terminal for amplifying the intermediate frequency signal of the first receiving circuit
A band-limited signal is output to 23b and a difference signal is output to output terminal 23a. This difference signal is generated by a circuit that outputs a residual main component in which the distortion and noise components contained in the signal are suppressed in the same manner as the television audio intermediate frequency amplifier circuit 16. 24 is a circuit having almost the same specifications as the above-mentioned intermediate frequency signal amplifier circuit 23, and is provided with a terminal 24b for outputting the intermediate frequency signal of the second FM receiving circuit and a difference signal output terminal 24a.
25は上記第1と第2の受信回路から出力する信号のう
ち、いずれか一方の信号を選択的に切り換えてFM復調器
26に送出するFMダイバシティー回路である。この回路25
の構成はテレビ音声ダイバシティー17の構成と略同一で
あり、信号入力端子25a,25bと、差信号入力端子25d,25
e、及び出力端子25cを有している。Reference numeral 25 is an FM demodulator by selectively switching one of the signals output from the first and second receiving circuits.
It is an FM diversity circuit to send to 26. This circuit 25
The configuration of is substantially the same as that of the TV audio diversity 17, and the signal input terminals 25a and 25b and the difference signal input terminals 25d and 25
e, and an output terminal 25c.
次に、第1図の回路の動作を説明する。なお、この回
路の動作条件として、テレビとFMが同時に受信されるこ
とはないものとする。テレビ音声を受信する場合は、テ
レビ受信回路と第1のFM受信回路が動作状態におかれ、
同一受信チャネルを受信するように設定される。また、
FMを受信するときは、第1及び第2のFM受信回路が同一
の受信周波数に設定される。Next, the operation of the circuit shown in FIG. 1 will be described. The operating conditions of this circuit are that TV and FM are not received at the same time. When receiving TV sound, the TV receiving circuit and the first FM receiving circuit are in operation,
It is set to receive the same reception channel. Also,
When receiving FM, the first and second FM receiving circuits are set to the same reception frequency.
まず、テレビ音声受信時はテレビ音声ダイバシティー
回路17の一方の入力端子17aに、アンテナ10に受信され
た信号から得られた中間周波数信号が入力し、他方の入
力端子17bにはアンテナ20に受信された信号から得られ
た中間周波数信号が入力する。同時に、ダイバシティー
回路17の入力端子17d,17eには2系統の中間周波数信号
から歪とノイズ成分が抑圧された残余の差信号がそれぞ
れ供給され、比較器において2系統の差信号レベルが比
較される。First, when receiving television sound, an intermediate frequency signal obtained from the signal received by the antenna 10 is input to one input terminal 17a of the television audio diversity circuit 17, and the antenna 20 is received at the other input terminal 17b. The intermediate frequency signal obtained from the obtained signal is input. At the same time, the residual difference signals in which distortion and noise components are suppressed are respectively supplied from the intermediate frequency signals of the two systems to the input terminals 17d and 17e of the diversity circuit 17, and the difference signal levels of the two systems are compared by the comparator. It
なお、中間周波数信号から歪とノイズ成分を抑圧し差
信号を生成する理由として、受信信号中に含まれる歪と
ノイズ成分は、主としてアンテナ入力信号のマルチパス
と、電界強度に依存して増減するので、これら2つのパ
ラメータからアンテナに入力する電波の質を概略的に判
断することができる。As a reason for suppressing the distortion and noise components from the intermediate frequency signal and generating the difference signal, the distortion and noise components included in the received signal increase or decrease mainly depending on the multipath of the antenna input signal and the electric field strength. Therefore, the quality of the radio wave input to the antenna can be roughly determined from these two parameters.
もし、2つの中間周波数増幅器16,23から出力する信
号のうち、いずれか一方の受信回路信号中に含まれる歪
及びノイズ成分が他方より多ければ、得られる差信号レ
ベルは小となるので、これよりスイッチは差信号レベル
の高い側に切り換えられる。つまり、2つのアンテナ1
0,20に入力する電波の条件が、より良好な側の受信回路
から出力する中間周波数信号がテレビ音声ダイバシティ
ー回路17によって選択され、復調器18において復調され
音声信号を得る。If the distortion and noise components contained in one of the receiving circuit signals out of the signals output from the two intermediate frequency amplifiers 16 and 23 are larger than the other, the difference signal level obtained is small, so The switch is switched to the side with the higher difference signal level. That is, two antennas 1
The television audio diversity circuit 17 selects the intermediate frequency signal output from the receiving circuit on the side where the radio waves input to 0 and 20 are better, and the demodulator 18 demodulates the intermediate frequency signal to obtain an audio signal.
この結果、アンテナ入力条件が変化し易い車両走行中
において、テレビ音声信号は2系統の受信回路により受
信され、受信条件のよい一方の受信回路の信号が選択さ
れるが、映像信号回路は非動作状態にあるので、バズ音
が音声信号回路に混入することなく、高品位の音声信号
が再生できる。As a result, the television audio signal is received by the two receiving circuits and the signal of one receiving circuit having a good receiving condition is selected while the vehicle is running in which the antenna input condition is apt to change, but the video signal circuit does not operate. Since it is in the state, a high-quality audio signal can be reproduced without the buzz sound being mixed into the audio signal circuit.
FM受信の場合も同様に、FMダイバシティー回路25に第
1及び第2のFM受信回路から得られる2つの中間周波数
信号が入力し、これら中間周波数信号から得られる差信
号の比較結果より、中間周波数信号中に含まれる歪とノ
イズ成分が少ない側の受信回路出力がFMダイバシティー
回路25により選択される。従って、FM放送も常に最良の
状態で受信することができる。そして、上記2つのダイ
バシティー回路17,25において信号切換時に若干のノイ
ズが発生するが、これらノイズは復調器18,26に設けら
れたノイズキャンセラー回路によって押圧することがで
きる。Similarly, in the case of FM reception, two intermediate frequency signals obtained from the first and second FM receiving circuits are input to the FM diversity circuit 25, and from the comparison result of the difference signals obtained from these intermediate frequency signals, The FM diversity circuit 25 selects the receiving circuit output on the side where the distortion and noise components contained in the frequency signal are small. Therefore, FM broadcasting can always be received in the best condition. Then, some noise is generated in the two diversity circuits 17 and 25 at the time of signal switching, and these noises can be suppressed by the noise canceller circuits provided in the demodulators 18 and 26.
なお、テレビチューナ12にはアンテナ10のほか複数の
アンテナが接続され、車両の停車中は図示しないダイバ
シティー切換時により受信状態の最もよいアンテナに切
り換えられることは従来例と同様である。Note that, in addition to the antenna 10, a plurality of antennas are connected to the television tuner 12, and while the vehicle is stopped, the antenna can be switched to the antenna with the best reception state at the time of diversity switching (not shown), as in the conventional example.
[考案の効果] 以上、説明したように、本考案による車載用テレビの
ダイバシティー受信機によれば、テレビ受信回路と、テ
レビとFMの両方を受信できる第1のFM受信回路と、第2
のFM受信回路と、テレビ音声ダイバシティー回路と、FM
ダイバシティー回路とを設けたので、アンテナに入力す
る電波の条件が常時変化する地域を走行中であって、テ
レビ音声を受信するときは、テレビ受信回路と第1のFM
受信回路の2系統の受信回路のうち、アンテナ入力条件
の良好な一方の受信回路の信号がテレビ音声ダイバシテ
ィー回路により切換選択され、常に高品位のテレビ音声
信号を受信することができる。そして、車両走行中の映
像信号回路は非動作状態に置かれるので、映像回路のバ
ズ音が音声信号回路に混入する不都合がない。[Advantages of the Invention] As described above, according to the diversity receiver of the vehicle-mounted television according to the present invention, the television receiving circuit, the first FM receiving circuit capable of receiving both the television and the FM, and the second
FM receiver circuit, TV audio diversity circuit, FM
Since the diversity circuit is provided, when receiving TV sound while traveling in an area where the conditions of the radio waves input to the antenna are constantly changing, the TV receiving circuit and the first FM
Of the two receiving circuits of the receiving circuit, the signal of one receiving circuit having a good antenna input condition is switched and selected by the television audio diversity circuit, and a high-quality television audio signal can always be received. Further, since the video signal circuit while the vehicle is traveling is placed in the non-operating state, there is no inconvenience that the buzz sound of the video circuit is mixed into the audio signal circuit.
また、FM放送を受信するときは、FMダイバシティー回
路により、同様にして2系統のFM受信回路のうち、アン
テナ入力条件の良好な側のFM受信回路信号が切換選択さ
れる。Further, when receiving an FM broadcast, the FM diversity circuit similarly switches and selects the FM receiving circuit signal on the side with favorable antenna input conditions from the two systems of FM receiving circuits.
第1図は本考案による車載用テレビのダイバシティー受
信機を示すブロック図である。 10,20,21………受信アンテナ、12………テレビチュー
ナ、16………音声中間周波数増幅回路、17………テレビ
音声ダイバシティー回路、22………FMチューナ、23,24
………FM中間周波数増幅回路、25………FMダイバシティ
ー回路。FIG. 1 is a block diagram showing a diversity receiver of a vehicle-mounted television according to the present invention. 10,20,21 ……… Reception antenna, 12 ……… TV tuner, 16 ……… Audio intermediate frequency amplification circuit, 17 ………… TV audio diversity circuit, 22 ……… FM tuner, 23,24
……… FM intermediate frequency amplifier circuit, 25 ……… FM diversity circuit.
Claims (1)
該テレビ放送の音声信号とFM放送電波の両方を受信可能
の第1のFM受信回路と、FM放送帯の電波を受信する第2
のFM受信回路と、上記テレビ受信回路と第1のFM受信回
路を同一受信周波数に設定して受信を行ない該受信回路
出力を比較していずれか一方の受信回路を切換選択する
テレビ音声ダイバシティー回路と、上記第1及び第2の
FM受信回路を同一受信周波数に設定して受信を行ない該
受信回路の出力を比較していずれか一方の受信回路を切
換選択するFMダイバシティー回路と、を備えたことを特
徴とする車載用テレビのダイバシティー受信機。1. A television receiving circuit for receiving television broadcasting,
A first FM receiving circuit capable of receiving both the audio signal of the TV broadcast and the FM broadcast radio wave, and a second FM receiving circuit for receiving the radio wave of the FM broadcast band
Of the above-mentioned FM receiving circuit and the above-mentioned television receiving circuit and the first FM receiving circuit are set to the same receiving frequency to perform reception, and the outputs of the receiving circuits are compared, and either one of the receiving circuits is switched and selected. A circuit, and the first and second
An in-vehicle television, comprising: an FM diversity circuit that sets the FM reception circuit to the same reception frequency, performs reception, compares the outputs of the reception circuits, and switches and selects one of the reception circuits. Diversity receiver.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9829190U JP2509964Y2 (en) | 1990-09-19 | 1990-09-19 | Car TV Diversity-Receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9829190U JP2509964Y2 (en) | 1990-09-19 | 1990-09-19 | Car TV Diversity-Receiver |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0455842U JPH0455842U (en) | 1992-05-13 |
JP2509964Y2 true JP2509964Y2 (en) | 1996-09-04 |
Family
ID=31839354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9829190U Expired - Lifetime JP2509964Y2 (en) | 1990-09-19 | 1990-09-19 | Car TV Diversity-Receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2509964Y2 (en) |
-
1990
- 1990-09-19 JP JP9829190U patent/JP2509964Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0455842U (en) | 1992-05-13 |
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