JP2008034898A - One-segment broadcast system - Google Patents
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- JP2008034898A JP2008034898A JP2006202676A JP2006202676A JP2008034898A JP 2008034898 A JP2008034898 A JP 2008034898A JP 2006202676 A JP2006202676 A JP 2006202676A JP 2006202676 A JP2006202676 A JP 2006202676A JP 2008034898 A JP2008034898 A JP 2008034898A
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Abstract
Description
本発明は有線テレビ放送や館内テレビ放送を、既存の放送受信機能つき携帯端末で、簡便に受信させるための技術に関する。 The present invention relates to a technique for easily receiving a cable television broadcast or an in-house television broadcast by an existing portable terminal with a broadcast receiving function.
我が国の地上デジタル放送として本年（２００６年）よりワンセグメント放送（以下ワンセグ放送という）の実用サービスが開始された。周知の通りこのワンセグ放送は、地上デジタル放送の放送方式となっているＯＦＤＭ変調における１３キャリアのうちの１キャリアを用いて、主に携帯型放送受信端末での屋外受信を容易にさせたものである。従来のアナログ方式テレビ放送では、受信電波強度が低下した場合や、多重反射（マルチパス）環境での画質劣化が著しく、安定な受信品質確保が極めて困難であったが、このワンセグ放送では変調方式や画像符号化方式の効果により、例えば走行中の電車内でも十分に安定かつ良好な受信映像を提供することが可能になった。 As a terrestrial digital broadcasting in Japan, a practical service of one-segment broadcasting (hereinafter referred to as one-segment broadcasting) has been started from this year (2006). As is well known, this one-seg broadcasting uses one carrier out of 13 carriers in OFDM modulation, which is a broadcasting system for terrestrial digital broadcasting, and mainly facilitates outdoor reception at a portable broadcast receiving terminal. is there. In the conventional analog television broadcasting, it was extremely difficult to ensure stable reception quality when the received radio wave intensity decreased or the image quality deteriorated in a multiple reflection (multipath) environment. And the effect of the image coding method, for example, it has become possible to provide sufficiently stable and good received video even in a running train.
ワンセグ放送の携帯受信端末としては、専用の受信カードを挿入したノートパソコン、受信機能内蔵の携帯型ＤＶＤプレーヤーやカーナビゲーション装置あるいは携帯電話、さらに専用の小型受信端末などが既に製品化されている。 As portable receiving terminals for one-segment broadcasting, notebook computers with a dedicated receiving card inserted therein, portable DVD players with built-in receiving functions, car navigation devices or mobile phones, and dedicated small receiving terminals have already been commercialized.
前記のような送信・受信形態はあくまでも、既存の地上波放送局がワンセグ放送を空中電波によって送信し、携帯受信端末によって屋外受信することを想定していたものであった。有線テレビ放送（以下ＣＡＴＶという）のいくつかの事業者においては、ワンセグ放送をその帯域内に含む地上波デジタル放送をそのまま、あるいは周波数をずらせて伝送（いわゆるパススルー）するサービスを行っているが、これは通常の地上波デジタル放送受信機での受信を想定したものであって、アンテナ入力端子を持たず内蔵アンテナだけで受信するワンセグ対応の携帯受信端末による受信は想定されていない。 The transmission / reception mode as described above was supposed to be such that an existing terrestrial broadcast station transmits a one-segment broadcast by airwaves and is received outdoors by a portable receiving terminal. Some companies of cable television broadcasting (hereinafter referred to as CATV) provide services for transmitting terrestrial digital broadcasting including one-seg broadcasting within its band as it is or shifting the frequency (so-called pass-through). This is intended for reception by a normal terrestrial digital broadcast receiver, and reception by a one-seg compatible portable reception terminal that does not have an antenna input terminal and receives only by a built-in antenna is not assumed.
したがってワンセグ対応の携帯受信端末を屋内（ビル内を含む）で受信する場合は、空中の放送電波が減衰しながらも屋内に到達した電波を内蔵アンテナで受信しているのが現状である。周知の通り地上波デジタル放送を搬送するＵＨＦ帯の電波は回折しにくく、さらに壁などで大きく減衰するため、屋内環境での受信は到達電波強度において著しく不利になるため、電波の劣化に強いワンセグ放送といえども十分な映像品質が得られない部屋や、あるいは放送チャンネルごとに受信品質が大きくばらついてしまう現象が存在していた。このため携帯受信端末で屋外でも屋内でも同様に安定受信できるという利用者に対する利便性は、現在のところ十分に得られていない。 Therefore, when receiving a one-seg compatible mobile reception terminal indoors (including in a building), the current situation is that the built-in antenna receives radio waves that have arrived indoors while aerial broadcast radio waves are attenuated. As is well known, UHF band radio waves that carry terrestrial digital broadcasts are not easily diffracted, and are greatly attenuated by walls. Even in broadcasting, there was a room where sufficient video quality could not be obtained, or a phenomenon that reception quality varied greatly for each broadcast channel. For this reason, the convenience to the user that the mobile receiver can stably receive the signal both outdoors and indoors has not been sufficiently obtained at present.
またＣＡＴＶ事業者は単にパススルーだけでなく、自らが番組内容を製作できる自主放送を地上波デジタル放送と同じ電波方式で送信することが認められているが、加入者が携帯電話のような携帯受信端末で屋内受信する方法が存在していないため、自主デジタル放送はもっぱら前記の通常の（据え置き型の）地上波デジタル放送受信機のみを対象としていた。 CATV operators are allowed not only to pass through, but also to transmit independent broadcasts on which they can produce program content using the same radio wave method as terrestrial digital broadcasts. Since there is no method for indoor reception at the terminal, the independent digital broadcasting is exclusively intended for the normal (stationary) terrestrial digital broadcasting receiver.
一方ショッピング施設やスポーツ競技施設などの館内で、専用の情報サービスを多くの来場者が所有する携帯受信端末に提供する場合でも、携帯電話やノートパソコンのインターネット接続機能を利用したホームページサービスは可能であるものの、デジタル放送を用いたものは存在していなかった。 On the other hand, even when providing dedicated information services to mobile receivers owned by many visitors in buildings such as shopping facilities and sports competition facilities, homepage services using the Internet connection function of mobile phones and laptop computers are possible. Although there was no digital broadcasting.
携帯受信端末向けのデジタル放送を屋内でも安定受信させるための方法として下記特許文献１では、受信環境のよいところに設置した拡張用受信アンテナの受信信号を増幅後に携帯受信端末の近傍まで有線で伝送し、携帯端末に密着させた小型送信アンテナで携帯端末に無線接続させる構成を提供している。しかしながらこの特許文献はワンセグ放送を対象としたものではなく、衛星モバイル放送と呼ばれる携帯端末向けのデジタル衛星放送を対象としたものであって、空が見える窓の近くならほぼ確実に衛星電波が受信できるのでよいが、地上波デジタル放送のようにどの窓に近づいても必ずしも十分な受信電波が期待できない場合は、有効に作用しないことが起こりえる。さらに前記のＣＡＴＶ自主放送や館内専用放送を携帯受信端末で視聴させる実現手段とはなりえない。 In Patent Document 1 below, as a method for stably receiving a digital broadcast for a portable receiving terminal even indoors, the signal received by an expansion receiving antenna installed in a good reception environment is amplified and transmitted to the vicinity of the portable receiving terminal after amplification. In addition, a configuration is provided in which a small transmission antenna in close contact with the mobile terminal is wirelessly connected to the mobile terminal. However, this patent document is not intended for one-segment broadcasting, but is intended for digital satellite broadcasting for mobile terminals called satellite mobile broadcasting. This is possible, but it may not work effectively if sufficient received radio waves cannot always be expected when approaching any window as in terrestrial digital broadcasting. Furthermore, it cannot be a means for allowing the CATV voluntary broadcast or the in-house broadcast to be viewed on a portable receiving terminal.
本発明は上記の実情を鑑みてなされたものであり、携帯受信端末により屋内や館内でもでも簡便に、かつ高品質で受信させるものであり、これによって携帯受信端末向けのＣＡＴＶ放送や館内放送の提供を実現することを目的とする。 The present invention has been made in view of the above circumstances, and allows a portable receiving terminal to easily receive a high quality signal indoors or in a building, thereby enabling CATV broadcasting or broadcasting in a building for portable receiving terminals. The purpose is to realize the provision.
請求項１に係る発明は、ワンセグメント放送を帯域内に含むＯＦＤＭデジタル放送を有線伝送路に送出する送出手段を送出側に備え、該有線伝送路で伝送された該ワンセグメント放送を携帯受信端末に免許不要な電波で無線接続する中継装置を受信側に備え、前記送出手段は有線テレビ放送の施設あるいは館内テレビ放送の施設内に設置されることを特徴とするワンセグメント放送システムに関する。 The invention according to claim 1 is provided with sending means for sending an OFDM digital broadcast including a one-segment broadcast in a band to a wired transmission line on the transmission side, and the one-segment broadcast transmitted through the wired transmission line is received by a portable receiving terminal. The present invention relates to a one-segment broadcasting system characterized in that the receiving side is provided with a relay device that wirelessly connects with an unlicensed radio wave, and the sending means is installed in a cable television broadcasting facility or an in-house television broadcasting facility.
請求項２に係る発明は、前記中継装置は有線テレビ放送加入者の宅内、あるいは館内の所定の場所に設置されることを特徴とする請求項１記載のワンセグメント放送システムに関する。 The invention according to claim 2 relates to the one-segment broadcasting system according to claim 1, wherein the relay device is installed in a house of a cable television broadcasting subscriber or in a predetermined place in a hall.
請求項３に係る発明は、前記中継装置は漏洩同軸ケーブルを用いたことを特徴とする請求項１および請求項２記載のワンセグメント放送システムに関する。 The invention according to claim 3 relates to the one-segment broadcasting system according to claim 1 or 2, wherein the relay device uses a leaky coaxial cable.
請求項４に係る発明は、前記中継装置は無線アンテナであることを特徴とする請求項１および請求項２記載のワンセグメント放送システムに関する。 The invention according to claim 4 relates to the one-segment broadcasting system according to claim 1 or 2, wherein the relay device is a radio antenna.
請求項５に係る発明は、前記中継装置はＵＨＦ帯域を通過させる高域通過型フィルタまたは帯域通過型フィルタを含む特徴とする請求項１ないし請求項４記載のワンセグメント放送システムに関する。 The invention according to claim 5 relates to the one-segment broadcasting system according to claims 1 to 4, wherein the relay device includes a high-pass filter or a band-pass filter that passes the UHF band.
請求項６に係る発明は、前記有線伝送路のケーブルのシールド線と前記携帯型受信装置の内部回路のアース電極とを有線で接続し、該ケーブルの芯線をアンテナ素子に接続することを特徴とする請求項４記載のワンセグメント放送システムに関する。 The invention according to claim 6 is characterized in that a shield wire of a cable of the wired transmission path and a ground electrode of an internal circuit of the portable receiver are connected by wire, and a core wire of the cable is connected to an antenna element. The one-segment broadcasting system according to claim 4.
請求項７に係る発明は、前記ＯＦＤＭデジタル放送に有線テレビ放送または館内テレビ放送における自主放送を含むことを特徴とする請求項１ないし請求項６記載のワンセグメント放送システムに関する。 The invention according to claim 7 relates to the one-segment broadcasting system according to any one of claims 1 to 6, wherein the OFDM digital broadcasting includes independent broadcasting in cable television broadcasting or in-house television broadcasting.
請求項８に係る発明は、前記ワンセグメント放送は自主制作の映像および音声コンテンツに加え、自主制作のデータ放送を含むことを特徴とする請求項７記載のワンセグメント放送システムに関する。 The invention according to claim 8 relates to the one-segment broadcast system according to claim 7, wherein the one-segment broadcast includes self-produced data broadcast in addition to self-produced video and audio content.
請求項１に係る発明によれば、有線伝送路しか所有しないＣＡＴＶ事業者や館内放送運用者が、アンテナ入力端子のない携帯受信端末に対して、ワンセグ放送サービスの提供を行うことが可能となる。 According to the first aspect of the present invention, it becomes possible for a CATV operator or an in-house broadcasting operator who has only a wired transmission path to provide a one-segment broadcasting service to a portable receiving terminal without an antenna input terminal. .
請求項２に係る発明によれば、ＣＡＴＶ加入者や、ショッピング施設やスポーツ競技施設の来場者は、自らの所有するワンセグ放送対応の携帯受信機をそのまま用いて、安定かつ高品質のワンセグ放送を受信することが可能となる。 According to the second aspect of the invention, CATV subscribers, visitors to shopping facilities and sports competition facilities can use their own one-segment broadcasting-compatible mobile receivers as they are to perform stable and high-quality one-segment broadcasting. It becomes possible to receive.
請求項３に係る発明によれば、有線伝送路から携帯受信端末への中継装置に漏洩同軸ケーブルを用いることにより、広範囲にかつ多数の携帯受信端末に対して同時に、ワンセグ放送を提供することが可能になる。 According to the invention of claim 3, by using a leaky coaxial cable in the relay device from the wired transmission path to the portable receiving terminal, one-segment broadcasting can be simultaneously provided to a large number of portable receiving terminals. It becomes possible.
請求項４に係る発明によれば、有線伝送路から携帯受信端末への中継装置に無線アンテナを用いることにより、簡単な構成で携帯受信端末に対して、ワンセグ放送を提供することが可能になる。 According to the invention of claim 4, by using a wireless antenna for the relay device from the wired transmission path to the portable receiving terminal, it becomes possible to provide one-segment broadcasting to the portable receiving terminal with a simple configuration. .
請求項５に係る発明によれば、前記中継装置にＵＨＦ帯域を通過させる高域通過型フィルタまたは帯域通過型フィルタを含ませることによって、提供しようとするワンセグ放送サービスには不要な信号の放射を防止するとともに、有線伝送路がＵＨＦ帯域より低い周波数帯域で上り方向の通信を行っている場合に、屋内や館内の空間雑音がこの上り通信帯域内に混入することを防止できる。 According to the invention of claim 5, by including a high-pass filter or a band-pass filter that allows the UHF band to pass through the repeater, it is possible to emit a signal that is unnecessary for the one-segment broadcasting service to be provided. In addition, it is possible to prevent indoor and indoor spatial noise from being mixed into the upstream communication band when the wired transmission line performs upstream communication in a frequency band lower than the UHF band.
請求項６に係る発明によれば、有線伝送路の同軸ケーブルのアース線と携帯型受信装置のアース電極とを接続することにより、受信感度を高めた無線接続が可能となる。 According to the sixth aspect of the present invention, wireless connection with improved reception sensitivity is possible by connecting the ground wire of the coaxial cable of the wired transmission path and the ground electrode of the portable receiver.
請求項７に係る発明によれば、有線テレビ事業者または館内テレビ運用者は、自らが製作した自主ワンセグメント放送も携帯受信端末に提供することが可能になる。 According to the seventh aspect of the invention, the cable television operator or the in-house television operator can also provide the mobile receiving terminal with the independent one-segment broadcast produced by the cable television operator or the in-house television operator.
請求項８に係る発明によれば、自主ワンセグ放送内に自主制作のデータ放送を含めることにより、テレビ放送だけの場合に比べて種類や量の多い情報提供が可能となる。 According to the eighth aspect of the invention, by including a self-produced data broadcast in the self-one-segment broadcasting, it is possible to provide information of a larger type and amount than in the case of only a television broadcast.
以下、本発明によるワンセグ放送システムの実施携帯について、図面を参照しながら説明する。 In the following, the carrying of the one-segment broadcasting system according to the present invention will be described with reference to the drawings.
図１は本発明によるワンセグ放送システムの基本構成を示しており、送信側施設（３）に設置されたＯＦＤＭデジタル放送送出手段（２）はワンセグ放送送出手段（１）を含み、有線伝送路（４）に放送信号を出力する。通常、ＯＦＤＭデジタル放送送出手段は地上に送信されている複数のＯＦＤＭデジタル放送を全て流すために、必要個数だけ設置されるが、ここではそのうちの１個を代表して図示する。また送信側施設がＣＡＴＶの施設である場合には、実際に出力されるのは、地上波アナログ放送、地上波デジタル放送、ＢＳ放送、ＣＳ放送などを適宜多重した複数チャンネルの信号であるが、本発明の説明には直接関係しないので図の中では省略する。
有線伝送路（４）は同軸ケーブルあるいは光ファイバ、あるいはそれらの組合せであり、周知のようにその伝送距離に応じて中継増幅器が必要な個数だけ配置される。
FIG. 1 shows a basic configuration of a one-segment broadcasting system according to the present invention. An OFDM digital broadcast sending means (2) installed in a transmission side facility (3) includes a one-segment broadcasting sending means (1), and includes a wired transmission line ( 4) Output broadcast signal. Normally, the required number of OFDM digital broadcast sending means is installed to send all the plurality of OFDM digital broadcasts transmitted to the ground, but one of them is shown here as a representative. In addition, when the transmission side facility is a CATV facility, what is actually output is a multi-channel signal appropriately multiplexed with terrestrial analog broadcast, terrestrial digital broadcast, BS broadcast, CS broadcast, etc. Since it is not directly related to the description of the present invention, it is omitted in the figure.
The wired transmission path (4) is a coaxial cable, an optical fiber, or a combination thereof. As is well known, a necessary number of relay amplifiers are arranged according to the transmission distance.
一方受信側施設（７）においては、通常は直接据え置き型のテレビ受信機器あるいはチューナ（いずれも図示せず）が接続されるが、ワンセグ放送対応の携帯受信端末（６）に信号を提供するために、有線から無線に変換する中継手段（５）が設置される。中継手段（５）は携帯受信端末（６）の近傍に設置し、その送出電波の強度は我が国の電波法で免許不要の無線局として認められる電界強度以下に設定される。ＣＡＴＶや館内放送では有線伝送路（４）の出力端子から取り出す放送信号の強度は、一定範囲に入るように管理されているので、中継手段（５）における送出電波の強度管理は比較的容易である。 On the other hand, the receiving facility (7) is usually connected directly to a stationary television receiver or a tuner (both not shown), but to provide a signal to the one-segment broadcasting-compatible portable receiving terminal (6). In addition, a relay means (5) for converting from wired to wireless is installed. The relay means (5) is installed in the vicinity of the portable receiving terminal (6), and the intensity of the transmitted radio wave is set to be equal to or less than the electric field intensity recognized as a license-free radio station by the Japanese radio law. In CATV and in-house broadcasting, since the intensity of the broadcast signal taken out from the output terminal of the wired transmission line (4) is managed so as to fall within a certain range, the intensity management of the transmitted radio wave in the relay means (5) is relatively easy. is there.
実際にこの構成で実用的なワンセグ受信が成立することを以下に述べる。
我が国の電波法で免許不要な無線局から送出可能な電波強度（いわゆる微弱無線の強度）はＵＨＦ帯においては、送信アンテナから３ｍの距離、１ＭＨｚ帯域内で、３１ｄＢマイクロＶ／ｍ以下と定められている。これに対してＤＱＰＳＫ変調されたワンセグ放送が所定の誤り率（２×１０Ｅ−４）以下となるための電界強度は６ＭＨｚ換算で６４．３ｄＢマイクロＶ／ｍ（１セグ放送教科書、羽鳥光俊著）とされている。ただしこれには、壁の通過損１０．１ｄＢおよび回線マージン８．４ｄＢが含まれており、今回の室内における使用環境では両者ともほとんど考慮する必要がなく、代わりに３ｄＢ程度の追加マージン見積もると６３．３−１０．１−８．４＋３＝約４９ｄＢマイクロＶ／ｍとなる。これを１ＭＨｚ帯域に換算すると１／６となるから８ｄＢ少ない４１ｄＢマイクロＶ／ｍが必要になる。
上記電波法の値は３１ｄＢマイクロＶ／ｍなので１０ｄＢ不足しているが、アンテナとの距離と電界強度は自由空間では反比例するので、距離を約１／１０に縮めれば、つまり距離を３ｍ／１０＝３０ｃｍに近づければ携帯受信端末に必要な電界強度が得られる。
It will be described below that practical one-segment reception is actually established with this configuration.
The radio wave intensity that can be transmitted from radio stations that do not require a license under the Japanese Radio Law (so-called weak radio intensity) is determined to be 31 dB micro V / m or less in the 1 MHz band at a distance of 3 m from the transmitting antenna in the UHF band. ing. On the other hand, the electric field strength for DQPSK-modulated one-segment broadcasting to be below a predetermined error rate (2 × 10E-4) is 64.3 dB micro V / m in terms of 6 MHz (1 segment broadcasting textbook, written by Mitsutoshi Hatori) It is said that. However, this includes a wall passage loss of 10.1 dB and a line margin of 8.4 dB, both of which need not be considered in the current indoor use environment. Instead, an additional margin of about 3 dB is estimated as 63. 3-10.1-8.4 + 3 = about 49 dB micro V / m. If this is converted to the 1 MHz band, it becomes 1/6, so that 41 dB micro V / m, which is 8 dB less, is required.
Since the value of the above radio wave method is 31 dB micro V / m, it is 10 dB short. However, since the distance from the antenna and the electric field strength are inversely proportional in free space, if the distance is reduced to about 1/10, that is, the distance is 3 m / If it is close to 10 = 30 cm, the electric field strength required for the portable receiving terminal can be obtained.
図２はＣＡＴＶや館内放送が、自ら製作する自主放送も送出する場合の構成を示す。図１に加えて、自主ワンセグ放送送出手段（１ｂ）を内部に含む自主ＯＦＤＭデジタル放送送出手段（２ｂ）が設置される。自主放送の内容については、ＣＡＴＶの場合にはいわゆるコミュニティチャンネルと呼ばれる地域密着型放送が代表的である。また館内放送では、その建物がショッピングセンターを主体とするものであれば館内の店舗やイベント紹介の放送、また建物がスポーツ競技用のスタジアムである場合にはその競技や選手に関する放送が代表例である。 FIG. 2 shows a configuration in the case where CATV or in-house broadcasting also sends out independent broadcasting produced by itself. In addition to FIG. 1, an independent OFDM digital broadcast transmission means (2b) including an independent one-segment broadcast transmission means (1b) is installed. In the case of CATV, community-based broadcasting called so-called community channel is typical for the content of independent broadcasting. Also, in-house broadcasts, if the building is mainly a shopping center, broadcasts of in-store stores and events, and if the building is a stadium for sports competitions, broadcasts about the competition and players are typical examples. is there.
図３は中継手段（５）の構成例である。有線伝送路（４）からの放送信号を入力し、必要に応じて設置されるワンセグ放送フィルタ（１１）を経て、漏洩同軸ケーブル（１２）に出力する。漏洩同軸ケーブルは周知の通り、同軸ケーブルの所定の部分のシールド被覆が除去されており、その部分から電波が漏洩されるようになっている。一般に漏洩箇所が複数個あるので、室内の広範囲な領域で携帯受信端末の受信が可能となる。あるいは同時に複数個の携帯受信端末に電波を供給できるので、館内利用などで多数の来場者にサービスを提供するのに適している。例えばスポーツ競技場や劇場などの観客席の配列に沿って漏洩同軸ケーブルを設置すれば、それぞれの来場者が座席に座りながら自分の所有する携帯受信端末で館内の自主放送を視聴することができる。 FIG. 3 shows a configuration example of the relay means (5). A broadcast signal from the wired transmission path (4) is input and output to the leaky coaxial cable (12) through a one-segment broadcast filter (11) installed as necessary. As is well known, a leaky coaxial cable has a shield coating removed from a predetermined portion of the coaxial cable, and radio waves are leaked from that portion. In general, since there are a plurality of leakage points, the mobile receiving terminal can receive signals in a wide area in the room. Or, since radio waves can be supplied to a plurality of portable receiving terminals at the same time, it is suitable for providing services to a large number of visitors such as in the hall. For example, if a leaky coaxial cable is installed along the arrangement of spectator seats in sports stadiums and theaters, each visitor can watch independent broadcasts in the hall on their own mobile receiver while sitting in the seat. .
ワンセグ放送フィルタ（１１）はワンセグ放送信号が伝送される周波数帯域を通過させるもので、ＵＨＦ周波数帯の帯域通過フィルタ、あるいはＵＨＦ帯域以上を通過させる広域フィルタで構成される。このフィルタにより、提供しようとするワンセグ放送サービスには不要な信号（例えばＦＭ放送やＶＨＦ帯のアナログ地上波放送など）の放射を防止するとともに、有線伝送路（４）がＵＨＦ帯域より低い周波数帯域で上り方向の通信を行っている場合に、屋内や館内の空間雑音がこの上り通信帯域内に混入することの防止が可能となる。具体的な上り通信としてはＣＡＴＶで使用されているケーブルモデムの信号で、５０ＭＨｚ以下の周波数が用いられている。この上り通信帯域に加入者側からの雑音が混入すると、いわゆる流号雑音となってケーブルモデムの上り通信に著しい劣化影響を与えるので、このようなフィルタを設置することが効果的である。 The one seg broadcast filter (11) passes a frequency band in which the one seg broadcast signal is transmitted, and is composed of a band pass filter in the UHF frequency band or a wide band filter that passes the UHF band or higher. This filter prevents emission of signals unnecessary for the one-segment broadcasting service to be provided (for example, FM broadcasting or analog terrestrial broadcasting in the VHF band), and the wired transmission path (4) is a frequency band lower than the UHF band. When performing upstream communication, it is possible to prevent indoor and indoor spatial noise from being mixed into this upstream communication band. As a specific uplink communication, a cable modem signal used in CATV, a frequency of 50 MHz or less is used. If noise from the subscriber side is mixed into this upstream communication band, it becomes so-called stream noise, which significantly affects the upstream communication of the cable modem, so it is effective to install such a filter.
図４は中継手段（５）の他の構成例である。必要に応じてワンセグ放送フィルタ（１１）が設置されるのは図２の場合と同じである。有線伝送路（４）すなわち同軸ケーブルの芯線からの信号はワンセグ放送フィルタ（１１）を経てアンテナ素子（１３）に接続され、空間に放射される。一方同軸ケーブルのアース線、すなわちシールド網線（２２）は中継手段（５）を経て、携帯端末（６）のアース端子（２３）に接続される。不平衡信号をダイポールアンテナで伝送する場合、送受装置間のアースが共通に取れていることが受信感度の点で最適であり、図４の構成によってそれが実現できる。 FIG. 4 shows another configuration example of the relay means (5). The one-seg broadcast filter (11) is installed as necessary as in the case of FIG. A signal from the wired transmission line (4), that is, the core wire of the coaxial cable is connected to the antenna element (13) through the one-segment broadcasting filter (11) and radiated to the space. On the other hand, the ground wire of the coaxial cable, that is, the shield network wire (22) is connected to the ground terminal (23) of the portable terminal (6) via the relay means (5). When an unbalanced signal is transmitted by a dipole antenna, it is optimal in terms of reception sensitivity that a common ground is provided between the transmission and reception devices, and this can be realized by the configuration of FIG.
携帯受信端末の内部回路のアース電極は、例えば外部電源端子（充電端子であることが多い）あるいはイヤホン接続端子のアース側として端末の外部に露出しているので、その部分を利用することができる。もともと無線接続と言っても前述したように、数ｃｍから３０ｃｍ程度の近傍接続であるので、有線によるアース接続も簡単に行える。 The ground electrode of the internal circuit of the portable receiving terminal is exposed to the outside of the terminal as, for example, the ground side of the external power supply terminal (often a charging terminal) or the earphone connection terminal, so that portion can be used. . Even if it is originally referred to as a wireless connection, as described above, it is a nearby connection of about several centimeters to 30 centimeters.
図４の構成による具体的な機器形態として、携帯受信端末用のクレイドル（スタンド型の機能拡張台）を図５に示す。クレイドルとしての中継手段（５）には有線伝送路（４）に相当する同軸ケーブルと、ＡＣアダプタ（３０）が接続され、携帯受信端末（６）にワンセグ放送信号と外部電源とを同時に供給している。携帯受信端末（６）は中継手段（５）を置き台としてその上に乗せられ、中継手段（５）の内部にて、同軸ケーブルの芯線と外部電源端子のアース側を接続することにより、同軸ケーブルのアースと携帯受信端末（６）のアースとを簡単に接続することができる。 FIG. 5 shows a cradle (stand-type function expansion base) for a portable receiving terminal as a specific device form according to the configuration of FIG. A coaxial cable corresponding to the wired transmission line (4) and an AC adapter (30) are connected to the relay means (5) as a cradle, and a one-segment broadcasting signal and an external power supply are simultaneously supplied to the portable receiving terminal (6). ing. The portable receiving terminal (6) is placed on the relay means (5) as a pedestal, and within the relay means (5), by connecting the core wire of the coaxial cable and the ground side of the external power supply terminal, The ground of the cable and the ground of the portable receiving terminal (6) can be easily connected.
なお自主ワンセグ放送は他の地上波デジタル放送のワンセグ放送と同様に、映像と音声から構成されるテレビ番組放送と、その番組と関連のある情報、あるいは番組とは独立した情報を提供するデータ放送を含んでもよい。これによってこの自主ワンセグ放送を受信する利用者に対してより多くの種類の、より多量の情報を提供することが可能となる。携帯電話のインターネット接続においても同様のサービスを提供することは可能であるが、その場合には携帯電話としての通信料が発生するのに対し、ワンセグ放送のデータ放送であれればその視聴は無料であるので、ＣＡＴＶの加入者や館内放送利用の来場者が安心して利用できるという利点がある。 In addition, independent one-segment broadcasting is similar to other terrestrial digital one-segment broadcasting, such as television program broadcasting composed of video and audio, and data broadcasting that provides information related to the program or information independent of the program. May be included. This makes it possible to provide a greater amount of information of a greater number to a user who receives this independent one-segment broadcasting. It is possible to provide the same service for the Internet connection of mobile phones, but in that case communication charges for mobile phones are incurred, but for 1Seg data broadcasting, viewing is free. Therefore, there is an advantage that CATV subscribers and visitors who use the broadcasting in the hall can use it with peace of mind.
本発明は既存のワンセグ放送対応の携帯受信端末に対して、ＣＡＴＶや館内放送の自主放送を含むデジタル放送を送信する放送システムを提供することができる。この結果ＣＡＴＶ事業者や館内放送運用者のサービス付加価値を高められ、また利用者の利便性を向上し、さらに携帯受信端末の普及を促進することができる。 The present invention can provide a broadcasting system that transmits digital broadcasting including CATV and independent broadcasting such as in-house broadcasting to an existing portable receiving terminal compatible with one-segment broadcasting. As a result, it is possible to increase the service added value of the CATV operator and the in-house broadcast operator, improve the convenience for the user, and further promote the popularization of the portable receiving terminal.
１ ワンセグ放送送出手段
２ ＯＦＤＭデジタル放送送出手段
４ 有線伝送路
５ 中継手段
６ 携帯受信端末
１１ ワンセグ放送フィルタ
１２ 漏洩同軸ケーブル
１３ アンテナ素子
２３ 携帯受信端末のアース電極
３０ ＡＣアダプタ
DESCRIPTION OF SYMBOLS 1 One-segment broadcast transmission means 2 OFDM digital broadcast transmission means 4 Wired transmission line 5 Relay means 6 Portable receiving terminal 11 One-segment broadcast filter 12 Leaky coaxial cable 13 Antenna element 23 Earth electrode 30 of portable reception terminal AC adapter
Claims (8)
8. The one-segment broadcasting system according to claim 7, wherein the one-segment broadcasting included in the independent broadcasting includes an independently-produced data broadcast in addition to independently produced video and audio contents.
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| JP2006202676A JP2008034898A (en) | 2006-07-26 | 2006-07-26 | One-segment broadcast system |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2006202676A JP2008034898A (en) | 2006-07-26 | 2006-07-26 | One-segment broadcast system |
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| JP2013232839A (en) * | 2012-05-01 | 2013-11-14 | Panasonic Mobile Communications Co Ltd | Retransmission device |
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