JP2007096403A - Broadcast receiver - Google Patents

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JP2007096403A
JP2007096403A JP2005279365A JP2005279365A JP2007096403A JP 2007096403 A JP2007096403 A JP 2007096403A JP 2005279365 A JP2005279365 A JP 2005279365A JP 2005279365 A JP2005279365 A JP 2005279365A JP 2007096403 A JP2007096403 A JP 2007096403A
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broadcast
segment
signal
error rate
broadcast signal
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JP4643406B2 (en
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Yoshihisa Nozawa
良寿 野澤
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Toshiba Corp
株式会社東芝
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<P>PROBLEM TO BE SOLVED: To provide a broadcast receiver which certainly receives a broadcast urgent alarm even when the receiver is under unstable situation while moving. <P>SOLUTION: A TMCC detecting section 21 makes a decision whether one segment broadcast (second broadcast signal) can be received during reception of 12 segment broadcast (first broadcast signal), and further makes a decision whether an urgent alarm exists. If an urgent alarm exists, a switching signal generating section 23 delivers a switching signal from 12 segment broadcast to one segment broadcast to an MPEG decoding section 16. Since switching is made to the one segment broadcast stronger against noise than 12 segment broadcast and having low characteristics of receiving C/N when an urgent alarm is broadcast, the urgent alarm is certainly received even under unstable situation while moving. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、例えば車載用の地上波デジタルテレビ受信機などに用いられる放送受信装置に関する。 The present invention relates to a broadcast receiving apparatus for use in terrestrial digital television receiver for vehicle.

日本の地上デジタル放送方式であるISDB−T(Integrated Services Digital Broadcasting for Terrestrial)方式では、図5に示すように、6MHzの帯域内に13個のセグメントを持つことで、セグメント単位で変調方式を変更できることが特徴である。 The digital terrestrial broadcasting system ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) system, which is in Japan, as shown in FIG. 5, to have a 13 segments in the band of 6 MHz, changing a modulation scheme for each segment it is a feature that you can.

変調方式の組み合わせは、最大3階層(3種類)である。 The combination of the modulation scheme is the maximum three layers (three). これによって、複数のセグメントを用いて固定受信向けのサービスを64QAM(Quadrature Amplitude Modulation:直交振幅変調)で行うと同時に、残りのセグメントで移動受信向けのサービスをQPSK(Quadrature Phase Shift Keying:4相位相変調)で行うサービスなどを可能としている。 Thus, a plurality of service stationary reception 64QAM using segments: simultaneously performed in (Quadrature Amplitude Modulation QAM), the remaining segments in service QPSK of mobile reception (Quadrature Phase Shift Keying: 4 Phase thereby making it possible to such services carried out in the modulation). 各セグメントの変調方式の情報は、TMCC(Transmission and Multiplex Configuration and Control:伝送多重制御)によって伝送される。 Information on the modulation scheme of each segment, TMCC: carried by (Transmission and Multiplex Configuration and Control transmission multiplexing control).

また、中央の1セグメント(図5の斜線で示す部分)について、セグメント横断的な周波数インターリーブ(並び替え)を行わないことによって、その1セグメントのみを部分受信することが可能である。 Further, the center of one segment (the portion indicated by oblique lines in FIG. 5), by not performing the segment cross-frequency interleaving (rearrangement), it is possible to partially receive only the one segment.

ここで、送信側(放送局)において、「12セグメント放送」と呼ばれる高品質の放送信号と、「1セグメント放送」と呼ばれる低品質の放送信号を用いて同じ内容の情報を同時に放送するサービスがある。 Here, the transmission side (broadcasting station), and high-quality broadcasting signal, called "12-segment broadcast" services using the low quality broadcast signals to broadcast the same information at the same time, called "1-segment broadcast" is is there. これを階層化伝送サービスと呼ぶ。 This is called hierarchical transmission service.

なお、12セグメント放送とは、上記13個のセグメントのうちの12個を利用した高品質放送サービスのことである。 Note that the 12-segment broadcast is that of the high-quality broadcasting services using 12 of the 13 segments. この12セグメント放送では、比較的高い受信C/N(キャリアノイズ比)を必要とし、例えば固定受信向けの高精細テレビ:HDTV(High Definition Television)など、高品質の映像の伝送に利用される。 In this 12-segment broadcast, and requires a relatively high reception C / N (carrier to noise ratio), for example high definition television stationary reception: like HDTV (High Definition Television), is used to transmit high-quality video. 一方、1セグメント放送とは、残りの1セグメントを利用した低品質放送サービスのことである。 On the other hand, the 1-segment broadcast is that of the low-quality broadcasting service using the remaining one segment. この1セグメント放送では、ノイズに強く、低い受信C/Nでも受信可能である。 In this one-segment broadcasting, resistant to noise, can be received even in a low received C / N. ただし、大量の情報を伝送できないため、基本情報や低品質の映像の伝送に限られる。 However, because it can not transmit the large amounts of information, limited to the transmission of the basic information and low quality of the video.

階層化伝送サービスでは、送信側(放送局)から同一内容の情報が高品質放送と低品質放送で送られてくる。 The hierarchical transmission services, information of the same contents from a sender (broadcast station) is sent with high quality broadcasting and low-quality broadcasting. 受信側では、そのどちらも受信可能であるが、通常の状態では高品質放送の受信モードに設定されており、高品質の情報を再生する。 On the receiving side, its although both can receive, in a normal state is set to the reception mode of the high-quality broadcasting, reproducing the high-quality information. また、受信状況が悪く、C/N比が低下している場合には、低品質放送の受信モードに切り替えて高品質の情報を再生する。 Further, the reception conditions are poor, when the C / N ratio is lowered reproduces high quality information by switching to receive mode of the low-quality broadcasting.

また、このような高品質放送と低品質放送の受信モードを切り替る方法として、受信信号の誤り率(ビット・エラー・レート)を検出し、その誤り率が所定の閾値を超えたときに低品質の放送情報を受信するように自動的に受信モードを切り替える技術が知られている(例えば、特許文献1参照)。 Further, as a method for switching a reception mode of such high-quality broadcasting and low-quality broadcasting, to detect the error rate of the received signal (bit error rate), low when the error rate exceeds a predetermined threshold value technology automatically switch the reception mode to receive the broadcast information quality is known (e.g., see Patent Document 1). これにより、例えば降雨や障害物などによって電波受信状況が悪くなっても、低品質放送に自動的に切り替えられて放送内容を続けて視聴することができる。 Thus, for example, be radio wave receiving status is deteriorated such as by rainfall or obstacles, can view continues to broadcast content automatically switched to the low-quality broadcasting.
特開2001−111642号公報 JP 2001-111642 JP

例えば、地震や津波などの発生した場合において、各放送局から一斉に緊急警報が放送される。 For example, in the case of the occurrence of earthquakes and tsunami, all at once to the emergency alert from each broadcast station is broadcasting. この場合、上述した高品質放送(12セグメント放送)と低品質放送(1セグメント放送)の両方で緊急警報情報が送出され、受信側では、そのどちらかの放送を受けることが可能である。 In this case, emergency alert information in both high-quality broadcasting described above (12-segment broadcast) and a low-quality broadcast (1 segment broadcasting) is sent, the receiving side is capable of receiving a broadcast of either one.

しかしながら、車両などの移動体に搭載された地上波デジタルテレビ受信機では、受信エリアが固定されていないため、そのときの場所によって上記緊急警報情報を安定して受信できない問題がある。 However, in the terrestrial digital television receiver mounted on a mobile object such as a vehicle, since the receiving area not fixed, there is a problem that can not be received stably the emergency warning information depending on the location at that time.

すなわち、図6に示すように、地上デジタル放送では、同じ放送局P0から発信される電波であっても、12セグメント放送と1セグメント放送のエリアE1,E2が異なり、12セグメント放送のエリアE1は1セグメント放送のエリアE2に比べて狭い。 That is, as shown in FIG. 6, in the terrestrial digital broadcasting, even radio wave transmitted from the same broadcasting station P0, different areas E1, E2 of the 12-segment broadcast and the 1-segment broadcast, the area E1 of the 12-segment broadcast narrower than the area E2 of 1-segment broadcast. この場合、12セグメント放送のエリアE1を半径L1の範囲とすると、1セグメント放送のエリアE2を半径L2(>L1)の範囲となる。 In this case, when the area E1 of the 12-segment broadcast range of radius L1, becomes an area E2 of 1 segment broadcasting and range of radii L2 (> L1). これは、変調方式の違いによるもので、12セグメント放送は64QAMの変調方式によって高品質放送を実現しているため、高品質の情報は送られても、その範囲は極めて狭くなる。 This is due to the difference of the modulation scheme, the 12-segment broadcasting that provides high-quality broadcasting with a modulation scheme of 64QAM, even if information of high quality are sent, the range is very narrow. 一方、1セグメント放送はQPSKの変調方式により低品質ながらも、その放送エリアを広く取ることができる。 Meanwhile, 1 segment broadcasting while low quality by QPSK modulation method, it is possible to widen the broadcast area.

今、地上波デジタルテレビ受信機を搭載した車両QがエリアE1内で12セグメント放送を受信しながら移動中であるとする。 Now, the vehicle Q equipped with digital terrestrial television receiver is assumed to be moving while receiving the 12-segment broadcast in the area E1. ここで、緊急警報が放送されたとき、車両QがエリアE1とエリアE2の境界付近を移動していると、12セグメント放送を安定して受信できず、緊急警報の内容を聞き逃してしまう可能性がある。 Here, when the emergency alert broadcast, when the vehicle Q is traveling around the boundary of the area E1 and area E2, can not be stably receive the 12-segment broadcast, possible miss listening to the contents of the emergency alert there is sex.

この場合、上記特許文献1のように誤り率だけで受信モードの自動切り替えを行う方法では、上記エリアE1とエリアE2の境界付近の不安定な状況下において、1セグメント放送への切り替えがなされるとは限らないため、緊急警報を確実に受信することはできない。 In this case, the method for automatically switching the reception mode only error rate as described in Patent Document 1, under unstable conditions near the boundary of the area E1 and area E2, the switching to the 1-segment broadcast is made because it does not always, it is not possible to reliably receive the emergency alert.

本発明は上記のような点に鑑みなされたもので、移動中の不安定な状況で緊急警報が放送された場合でも、その緊急警報を確実に受信することのできる放送受信装置を提供することを目的とする。 The present invention has been made in view of the problems described above, even if the emergency alert broadcast in an unstable situation in the mobile, to provide a broadcast receiver capable of receiving the emergency alert reliably With the goal.

本発明の一観点による放送受信装置によれば、送信側から同時に送信される第1の放送信号と、この第1の放送信号よりも品質の低い第2の放送信号とを切り替えて受信可能な機能を備えた放送受信装置において、上記第1の放送信号の受信中に上記第2の放送信号の受信が可能であるか否かを判断する第1の判断手段と、この第1の判断手段によって上記第2の放送信号の受信が可能であると判断された場合に、緊急警報の有無を判断する第2の判断手段と、この第2の判断手段によって緊急警報ありと判断された場合に、上記第1の放送信号から上記第2の放送信号の受信モードに切り替える受信モード切替え手段とを具備した構成される。 According to the broadcast receiving apparatus according to an aspect of the present invention, a first broadcast signal transmitted simultaneously from the transmitting side, capable of receiving by switching a second broadcast signal lower quality than the first broadcast signal in the broadcast receiving apparatus having a function, a first determination means for determining whether it is possible to receive the second broadcast signal during reception of the first broadcast signal, the first determination means by when it is determined that it is possible to receive the second broadcast signal, and a second determination means for determining whether the emergency alert, if it is determined that there is an emergency alert by the second determination means , and from the first broadcast signal; and a reception mode switching means for switching to receive mode of the second broadcast signal.

本発明によれば、高品質放送である第1の放送信号の受信中に緊急警報を検出した際に、低品質放送である第2の放送信号の受信モードに切り替えるようにしたことで、移動中の不安定な状況で緊急警報が放送された場合でも、その緊急警報を確実に受信することができる。 According to the present invention, upon detecting an emergency alert during the reception of the first broadcast signal is a high-quality broadcasting, it was to switch to the receive mode of the second broadcast signal is a low-quality broadcasting, mobile even if the emergency alarm in an unstable situation in was broadcast, it is possible to receive the emergency alert securely.

以下、図面を参照して本発明の実施形態を説明する。 Hereinafter, with reference to the drawings illustrating an embodiment of the present invention.

(第1の実施形態) (First Embodiment)
図1は本発明の第1の実施形態に係る地上デジタル放送を受信可能な放送受信装置の構成を示すブロック図である。 Figure 1 is a block diagram showing a configuration of a first exemplary receivable broadcast receiving apparatus terrestrial digital broadcasting according to an embodiment of the present invention. なお、この放送受信装置は、例えば車載用の地上波デジタルテレビ受信機として用いられ、移動中に12セグメント放送(第1の放送信号)から1セグメント放送(第2の放送信号)への受信モードの切り替え機能を備える。 Note that the broadcast receiving apparatus is used, for example, as a digital terrestrial television receivers for vehicle, the receive mode of 12-segment broadcast while moving from (a first broadcast signal) to a 1-segment broadcast (second broadcast signal) equipped with a switching function.

図1に示すように、本実施形態における放送受信装置は、受信アンテナ11、チューナ12、OFDM(Orthogonal Frequency Division Multiplexing:直交周波数分割多重)復調部13、誤り訂正部14、多重分離部15、MPEG(Moving Picture Experts Group)デコード部16、画像重畳部17、制御部18、表示部19、スピーカ20を備える。 As shown in FIG. 1, the broadcast receiving apparatus of this embodiment, the receiving antenna 11, a tuner 12, OFDM (Orthogonal Frequency Division Multiplexing: orthogonal frequency division multiplexing) demodulator 13, an error correction section 14, demultiplexing section 15, MPEG (Moving picture Experts Group) decoding unit 16, an image superimposing section 17, the control unit 18, a display unit 19, a speaker 20.

受信アンテナ11によって受信されたデジタル伝送信号は、チューナ12により周波数変換された後、OFDM復調部13によって復調される。 Digital transmission signal received by the receiving antenna 11, after being frequency converted by the tuner 12 is demodulated by the OFDM demodulation unit 13. そして、誤り訂正部14により誤り訂正処理が行われ、放送局から送り出されたTS(Transport Stream)パケットに戻される。 Then, error correction processing is performed by the error correction unit 14, it is returned to the TS (Transport Stream) packets sent out from a broadcasting station. TSパケットには、映像・音声のパケット以外にデータ放送や電子番組表:EPG(Electric Program Guide)、選局に必要な情報などが含まれている。 The TS packets, video and audio of the data broadcasting and electronic program guide in addition to the packet: EPG (Electric Program Guide), are included, such as information necessary for channel selection. なお、地上デジタル放送では、1つの伝送チャンネルで複数の番組を同時に放送することが可能なので、複数の番組が同じTSとして送られて来ることがある。 In the terrestrial digital broadcasting, since it is possible to broadcast a plurality of programs simultaneously on a single transmission channel, a plurality of programs is sent as the same TS.

多重分離部15では、TSパケットを目的別に分離し、映像・音声のパケットであれば、MPEGデコード部16へ送り、データ放送のパケットであれば、制御部18へ送る。 The demultiplexer 15 separates the TS packets by purpose, if a packet of video and audio, sent to MPEG decoding unit 16, if the packet of data broadcast, and sends to the control unit 18. この多重分離部15によって得られた映像信号と音声信号は、MPEGデコード部16により正規の信号に復元され、表示部19(TVモニタ)やスピーカ20などの外部出力装置へ出力される。 The demultiplexer video signal and an audio signal obtained by 15 is restored to the normal signal by the MPEG decoding unit 16, is output to an external output device such as a display unit 19 (TV monitor), a speaker 20.

制御部18は、本装置全体の制御を行うものである。 Control unit 18 performs control of the entire apparatus. この制御部18は、マイクロプロセッサからなり、ROM等の記録媒体に記録されたプログラムを読み込むことにより、そのプログラムに記述された手順に従って各種処理を実行する。 The control unit 18 is composed of a microprocessor, by loading the program recorded in a recording medium such as a ROM, and executes various processes in accordance with the procedure described in the program.

さらに、この放送受信装置には、緊急警報の受信時に、12セグメント放送と1セグメント放送のいずれかの受信モードに切り替えを行うために、TMCC(Transmission and Multiplexing Configuration Control:伝送多重構成制御)検出部21、BER(Bit Error Rate)検出部22、切替信号発生部23を備える。 Furthermore, this broadcast receiving apparatus, upon reception of the emergency alert, in order to switch to one of the reception mode 12-segment broadcast and the 1-segment broadcast, TMCC (Transmission and Multiplexing Configuration Control: transmission multiplexed configuration control) detector 21, BER (Bit Error Rate) detection unit 22, and a switching signal generation unit 23.

TMCC検出部21は、OFDM信号に含まれるTMCC信号を検出する。 TMCC detection section 21 detects the TMCC signal contained in the OFDM signal. TMCC信号は、デジタル放送の変調方式などを示した信号である。 TMCC signal is a signal showing a modulation scheme, etc. of digital broadcasting. 図7に示すように、このTMCC信号は、システム識別フラグD1、伝送パラメータ切替指標フラグD2、起動制御信号フラグD3、カレント情報フラグD4、ネクスト情報フラグD5、連結送信位相補正量D6を含む。 As shown in FIG. 7, the TMCC signal includes a system identification flag D1, transmission parameter switching index flag D2, start control signal flag D3, current information flag D4, the next information flag D5, connected transmission phase correction amount D6.

識別フラグD1は、地上デジタルテレビジョン放送システムまたは地上デジタル音声放送システムを識別するための情報である。 Identification flag D1 is information for identifying the digital terrestrial television broadcasting system or a terrestrial digital audio broadcasting system. つまり、このシステム識別フラグD1では、デジタルテレビまたはデジタルラジオを指定する。 That is, in the system identification flag D1, specifies a digital television or digital radio.

伝送パラメータ切替指標フラグD2は、受信機に切り替えの通知とタイミングの通知を行うものである。 Transmission parameter switching index flag D2 is intended to notify the switching notification and timing receiver.

起動制御信号フラグD3は、「起動制御なし」または「起動制御あり(緊急警報信号を伝送する場合)」を識別するための情報である。 Start control signal flag D3 is information for identifying the "no activation control" or "activation control might (when transmitting an emergency alert signal)."

カレント情報フラグD4は、現在放送中の情報の形式を示すものであり、部分受信フラグとA階層〜C階層の3つの伝送パラメータ情報を含む。 Current information flag D4 is one that indicates the format of the information being broadcast, including three transmission parameter information of the partial reception flag and the A-layer ~C hierarchy. 部分受信フラグで、「部分受信なし」または「部分受信あり」を識別できる。 In partial reception flag, to identify the "no partial reception" or "with partial reception". なお、ここで言う部分受信とは、低品質放送である1セグメント放送を受信可能であることを意味している。 Here, a partial reception say, it means that can receive one-segment broadcast is a low-quality broadcasting. また、A階層〜C階層の伝送パラメータ情報は、変調方式が異なる3つの階層を区別するための情報であって、キャリア変調マッピング方式、畳込み符号化率、時間インターリーブの長さ、セグメント数などを識別できる。 The transmission parameter information of the A-layer ~C hierarchy is information for distinguishing a modulation scheme different three tiers, carrier modulation mapping scheme, convolution coding rate, length of time interleaving, number of segments etc. It can be identified.

ネクスト情報フラグD5では、次に放送される情報を識別できる。 In the next information flag D5, to identify the next information to be broadcast. また、連結送信位相補正量D6は、連結送信を行う場合の位相の補正量を示す情報である。 The coupling transmission phase correction amount D6 is information indicating a correction amount of the phase in the case of performing the coupling transmission.

BER検出部22は、受信信号の誤り率を検出し、その検出結果を切替信号発生部23に出力する。 BER detection unit 22 detects the error rate of the received signal, and outputs the detection result to the switching signal generating unit 23. なお、このBER検出部22は、後述する第2および第3の実施形態で用いる。 Incidentally, the BER detection unit 22 used in the second and third embodiments described later. 切替信号発生部23は、12セグメント放送と1セグメント放送の受信モードの切り替えを行う。 Switching signal generation unit 23 switches the reception mode 12-segment broadcast and the 1-segment broadcast.

次に、第1の実施形態の動作について説明する。 Next, the operation of the first embodiment.
なお、以下の各フローチャートで示される処理は、マイクロコンピュータである制御部18が所定のプログラムを読み込むことにより実行される。 Note that the process shown in the flowchart below, the control unit 18 is a microcomputer is executed by reading a predetermined program. 他の実施形態においても同様であり、それぞれの実施形態に対応したプログラムを制御部18が読み込むことで実行される。 The same is true in other embodiments, be performed by a program corresponding to each of the embodiments the control unit 18 reads.

第1の実施形態では、12セグメント放送受信中に緊急警報が放送されたときに、12セグメント放送から1セグメント放送に切り替え、緊急警報の終了後に12セグメント放送に戻すことを特徴としている。 In the first embodiment, when the emergency alert broadcast in 12-segment broadcast reception is switched to 1-segment broadcast from 12-segment broadcast is characterized by returning to the 12-segment broadcast after the end of the emergency alert.

図2は第1の実施形態における放送受信装置の処理動作を示すフローチャートである。 Figure 2 is a flow chart showing a processing operation of the broadcast receiving apparatus in the first embodiment. 今、階層化伝送サービスにより12セグメント放送と1セグメント放送が同時送信されており、受信側である本装置では、通常の受信状態において12セグメント放送を受信しているものとする。 Now, 12-segment broadcast and the 1-segment broadcast by layered transmission services are transmitted simultaneously, in the present device is a receiving side, it is assumed that the receive 12-segment broadcast in the normal receiving state.

また、地震や津波などの災害情報を伝える手段として、地上デジタル放送ではOFDMフレーム中にTMCC信号がある。 In addition, as a means to communicate disaster information such as earthquakes and tsunami, there is a TMCC signal in the OFDM frame in the digital terrestrial broadcasting. さらに、そのTMCC信号の中には、部分受信(1セグメント放送)の有無を示すフラグ(図7のカレント情報フラグD4)と、緊急警報(EWS:Emergency Warning System)が放送中であるか否かを示すフラグ(図7の起動制御信号フラグD3)が付加されている。 Furthermore, some of the TMCC signal, and a flag indicating the presence or absence of a partial reception (1 segment broadcasting) (current information flag D4 in FIG. 7), emergency warning (EWS: Emergency Warning System) whether it is being broadcast the flag indicating (start control signal flag D3 in FIG. 7) is added.

図2に示すように、12セグメント放送を受信中に(ステップA11)、TMCC検出部21によって部分受信(1セグメント放送)が検出され(ステップA12のYes)、さらに、緊急警報が放送されていることが検出されると(ステップA13のYes)、切替信号発生部23によって12セグメント放送から1セグメント放送の受信モードへ切り替えるための信号がMPEGデコード部16に出力される(ステップA14)。 As shown in FIG. 2, while receiving the 12-segment broadcast (step A11), the portion received by the TMCC detection section 21 (1 segment broadcasting) is detected (Yes in step A12), further, an emergency alert is broadcasted If it is detected (Yes in step A13), a signal for switching by the switching signal generation unit 23 to the reception mode of the 1-segment broadcast from 12-segment broadcast is outputted to the MPEG decoding unit 16 (step A14).

これにより、1セグメント放送の受信モードに切り替えられ、その1セグメント放送で送られてくる緊急警報が表示部19およびスピーカ20を通じて再生出力される(ステップA15)。 Thus, 1 is switched to the reception mode segment broadcast, the 1 segment emergency alarm sent by broadcast is reproduced output through the display unit 19 and the speaker 20 (step A15). また、TMCC信号の起動制御信号が緊急警報なしとなるまで、1セグメント放送の再生が継続される(ステップA16のYes)。 Moreover, until the start control signal of the TMCC signal is no emergency alert, 1 segment broadcasting reproduction is continued (Yes in step A16).

緊急警報の放送が終了すると(ステップA16のNo)、切替え信号発生部23から1セグメント放送から12セグメント放送の受信モードへ切り替えるための信号がMPEGデコード部16に出力され、12セグメント放送の受信状態に戻る(ステップA17)。 Emergency the alarm broadcast is completed (No in step A16), a signal for switching from the switching signal generator 23 from the 1-segment broadcast to the reception mode of the 12-segment broadcast is output to the MPEG decoding unit 16, the reception state of the 12-segment broadcast Back to (step A17).

このように、地震、津波などの災害情報を伝える緊急警報が放送された場合に、12セグメント放送よりもノイズに強く、受信C/Nの低い特性を有する1セグメント放送に切り替えることで、緊急警報を確実に受信することができる。 Thus, when an earthquake, emergency alert convey disaster information such as tsunami was broadcast, resistant to noise than the 12-segment broadcast, by switching to the 1-segment broadcast with low characteristic reception C / N, emergency alert it is possible to reliably receive the.

また、図6で説明したように、1セグメント放送は12セグメント放送よりもエリアが広い。 Further, as described in FIG. 6, 1 segment broadcasting is wider area than 12-segment broadcast. したがって、例えば本装置を搭載した車両Qが12セグメント放送のエリアE1と1セグメント放送のエリアE2の境界付近を移動中に緊急警報が放送された場合でも、1セグメント放送への切替えによって、そのときの緊急警報を安定して受信できる。 Thus, for example, even if the vehicle Q equipped with the device is broadcast emergency alarm while moving near the boundary between the area E1 of the 12-segment broadcast 1 segment broadcasting area E2, the switching to the 1-segment broadcast, when the an emergency alert can be received stable of. なお、1セグメント放送は12セグメント放送に比べて画像等の品質は低下するものの、緊急警報では、品質よりもその内容を確実に伝えることが重要であることから、特に問題とはならない。 Incidentally, 1 although segment broadcasting quality such as an image is reduced as compared with the 12-segment broadcast, the emergency alert, since it is important to convey its contents securely than the quality, no particular problem.

さらに、緊急警報の放送終了後は12セグメント放送の受信モードに自動的に切り替えられるため、ユーザは特に意識しなくとも、12セグメント放送をそのまま視聴することが可能である。 Furthermore, since the emergency alert broadcast after the end is automatically switched to the reception mode of the 12-segment broadcast, the user is without being particularly aware, it is possible to directly view 12-segment broadcast.

(第2の実施形態) (Second Embodiment)
次に、第2の実施形態について説明する。 Next, a second embodiment will be described.
第2の実施形態では、受信信号の誤り率を加味して12セグメント放送と1セグメント放送の切り替えを行うことを特徴としている。 In the second embodiment, it is characterized in that to switch the consideration to 12-segment broadcast and the 1-segment broadcast an error rate of the received signal.

なお、装置構成としては、図1に示したBER検出部22を用いること以外は基本的には上記第1の実施形態と同様であるため、ここではフローチャートを参照しながら処理的な違いについて説明する。 As the device configuration, except for using the BER detection unit 22 shown in FIG. 1 is basically the same as in the first embodiment, wherein the processing differences with reference to the flowchart description to.

図3は第2の実施形態における放送受信装置の処理動作を示すフローチャートである。 Figure 3 is a flow chart showing the processing operation of the broadcast receiving apparatus in the second embodiment. 上記第1の実施形態と同様に、今、階層化伝送サービスにより12セグメント放送と1セグメント放送が同時送信されており、受信側である本装置では、通常の受信状態において12セグメント放送を受信しているものとする。 As in the first embodiment, now, 12-segment broadcast and the 1-segment broadcast by layered transmission services are transmitted simultaneously, in the present device is a receiving side, receiving the 12-segment broadcast in a normal reception state and those are.

図3に示すように、12セグメント放送を受信中に(ステップB11)、TMCC検出部21によって部分受信(1セグメント放送)が検出された場合において(ステップB12のYes)、上述したMCC信号に付加された起動制御信号フラグD3に基づいて緊急警報の有無が判断される(ステップB13)。 As shown in FIG. 3, while receiving 12-segment broadcast (step B11), when the portion received by the TMCC detection section 21 (1 segment broadcasting) is detected (Yes in step B12), added to the MCC signal described above the presence or absence of the emergency alert is determined on the basis of the start control signal flag D3 (step B13).

ここで、緊急警報なしの場合には(ステップB13のNo)、BER検出部22によって検出される受信信号の誤り率が予め設定された閾値1を超えた場合に(ステップB14のYes)、切替信号発生部23によって12セグメント放送から1セグメント放送の受信モードへ切り替えるための信号がMPEGデコード部16に出力される(ステップB15)。 Here, an emergency in the case of no alarm (No in step B13), (Yes in step B14) if the error rate of the received signal detected by the BER detection unit 22 exceeds the threshold value 1 that is set in advance, switching signal for switching the signal generator 23 to the receive mode 1 segment broadcasting from 12-segment broadcast is outputted to the MPEG decoding unit 16 (step B15).

これにより、例えば降雨や障害物などの影響で受信状況が悪く、受信C/Nが低下している場合において、1セグメント放送に切り替えられことになる(ステップB16)。 Thus, for example, poor reception conditions due to the influence of rainfall or obstacles, when the receiving C / N is lowered, so that is switched to the 1-segment broadcast (step B16). 以後は、受信状況が回復し、誤り率が閾値1以下となったときに、12セグメント放送に戻される。 Thereafter, the reception situation is restored, when the error rate becomes the threshold 1 or less, is returned to the 12-segment broadcast.

一方、緊急警報ありの場合には(ステップB13のYes)、BER検出部22によって検出される受信信号の誤り率が閾値2を超えているか否かが判断される(ステップB17)。 On the other hand, in the case where there is an emergency alert (Yes in step B13), whether an error rate of the received signal detected by the BER detection unit 22 exceeds the threshold value 2 is judged (step B17). この場合、閾値2は、通常放送時の切替え条件である閾値1よりも低く設定されている。 In this case, the threshold value 2 is set to be lower than the threshold 1 is a condition switching between the normal broadcast. つまり、同じ受信状況であっても、緊急警報の放送時には通常放送時よりも早く1セグメントへの切替えを行うべく、誤り率の閾値が低く設定されている。 That is, even in the same receiving condition, to perform the switching to the emergency alert one segment earlier than normal broadcast during the broadcast of the threshold value of the error rate is set low.

受信信号の誤り率が閾値2を超えていた場合には(ステップB17のYes)、切替信号発生部23によって12セグメント放送から1セグメント放送の受信モードへ切り替えるための信号がMPEGデコード部16に出力される(ステップB18)。 If the error rate of the received signal exceeds the threshold value 2 (Yes in step B17), the signal for switching by the switching signal generation unit 23 to the reception mode of the 1-segment broadcast from 12-segment broadcast is output to the MPEG decoding section 16 It is (step B18).

これにより、1セグメント放送の受信モードに切り替えられ、その1セグメント放送で送られてくる緊急警報が表示部19およびスピーカ20を通じて再生出力される(ステップB19)。 Thus, 1 is switched to the reception mode segment broadcast, the 1 segment emergency alarm sent by broadcast is reproduced output through the display unit 19 and the speaker 20 (step B19). また、TMCC信号の起動制御信号が緊急警報なしとなるまで、1セグメント放送の再生が継続される(ステップB20のYes)。 Moreover, until the start control signal of the TMCC signal is no emergency alert, 1 segment broadcasting reproduction is continued (Yes in step B20).

12セグメントへの復帰は、上述した通常放送時の切替え条件である閾値1との比較により行う。 Return to 12 segments is performed by comparison with the threshold value 1 is a condition switching between the normal broadcast described above. すなわち、緊急警報の放送終了後において(ステップB20のNo)、受信信号の誤り率と閾値1とを比較した結果、誤り率が閾値1を超えていた場合には(ステップB21のYes)、そのまま1セグメント放送の受信モードが継続される(ステップB19)。 That, (No in step B20) after the broadcast end emergency alert, as a result of comparing the error rates and the threshold value 1 of the received signal, if the error rate exceeds the threshold value 1 (Yes in step B21), as it receive mode 1 segment broadcasting is continued (step B19). 一方、誤り率が閾値1以下であった場合には(ステップB21のNo)、12セグメント放送の受信モードに切り替えられる(ステップB22)。 On the other hand, if the error rate was the threshold 1 or less is switched on (No in step B21), the reception mode of the 12-segment broadcast (step B22).

このように、緊急警報が放送された際に、受信信号の誤り率に応じて受信モードの切り替えを行うことで、12セグメント放送では受信が困難な状況でのみ、1セグメント放送に切り替えて緊急警報を受信することができる。 Thus, when the emergency alert broadcast, by performing switching of the reception mode in response to the error rate of the received signal, only the reception is difficult in 12-segment broadcast, the emergency alert is switched to 1 segment broadcasting it is possible to receive. この場合、通常放送時の切替え条件である閾値1よりも高く設定された閾値2に基づいて1セグメント放送の受信モードに切り替えられるため、同じ受信状況下にあっても、緊急警報については1セグメント放送への早めの切替えにより確実に受信することができる。 In this case, one segment since switched to the reception mode 1 segment broadcasting based on a threshold 2 is set higher than the threshold value 1 is a condition switching between the normal broadcast, even under the same reception conditions for emergency alarm it can be reliably received by early switching to the broadcast.

(第3の実施形態) (Third Embodiment)
次に、本発明の第3の実施形態について説明する。 Next, a description will be given of a third embodiment of the present invention.
第3の実施形態では、12セグメント放送から1セグメント放送の受信モードに切り替えられた際に、受信信号の誤り率が低い場合に他チャンネルをスキャンすることを特徴としている。 In the third embodiment, when switched to the reception mode of the 1-segment broadcast from 12-segment broadcast is characterized by scanning the other channels when the error rate of the received signal is low.

なお、装置構成としては、図1に示したBER検出部22を用いること以外は基本的には上記第1の実施形態と同様であるため、ここではフローチャートを参照しながら処理的な違いについて説明する。 As the device configuration, except for using the BER detection unit 22 shown in FIG. 1 is basically the same as in the first embodiment, wherein the processing differences with reference to the flowchart description to.

図4は第3の実施形態における放送受信装置の処理動作を示すフローチャートである。 Figure 4 is a flow chart showing the processing operation of the broadcast receiving apparatus in the third embodiment. 上記第1の実施形態と同様に、今、階層化伝送サービスにより12セグメント放送と1セグメント放送が同時送信されており、受信側である本装置では、通常の受信状態において12セグメント放送を受信しているものとする。 As in the first embodiment, now, 12-segment broadcast and the 1-segment broadcast by layered transmission services are transmitted simultaneously, in the present device is a receiving side, receiving the 12-segment broadcast in a normal reception state and those are.

図4に示すように、12セグメント放送を受信中に(ステップC11)、TMCC検出部21によって部分受信(1セグメント放送)が検出された場合において(ステップC12のYes)、上述したMCC信号に付加された起動制御信号フラグD3に基づいて緊急警報の有無が判断される(ステップC13)。 As shown in FIG. 4, while receiving 12-segment broadcast (step C11), when the portion received by the TMCC detection section 21 (1 segment broadcasting) is detected (Yes in step C12), added to the MCC signal described above the presence or absence of the emergency alert is determined on the basis of the start control signal flag D3 (step C13).

緊急警報ありの場合には(ステップC13のYes)、BER検出部22によって検出される受信信号の誤り率が閾値2を超えているか否かが判断される(ステップC14)。 In the case of Yes Emergency Alert (Yes in step C13), whether an error rate of the received signal detected by the BER detection unit 22 exceeds the threshold value 2 is judged (step C14). 上記第2の実施形態で説明したように、この閾値2は、通常放送時の切替え条件である閾値1よりも高く設定されている。 As described in the second embodiment, the threshold value 2 is set higher than the threshold value 1 is a condition switching between the normal broadcast. つまり、同じ受信状況であっても、緊急警報の放送時には通常の放送時よりも早く1セグメントへの切替えを行うべく、誤り率の閾値が高めに設定されている。 That is, even in the same receiving condition, to perform the switching to the emergency alert one segment earlier than normal broadcast during the broadcast of the is set to increase the threshold value of the error rate.

受信信号の誤り率が閾値2を超えていた場合には(ステップC14のYes)、切替信号発生部23によって12セグメント放送から1セグメント放送の受信モードへ切り替えるための信号がMPEGデコード部16に出力される(ステップC15)。 If the error rate of the received signal exceeds the threshold value 2 (Yes in step C14), the signal for switching by the switching signal generation unit 23 to the reception mode of the 1-segment broadcast from 12-segment broadcast is output to the MPEG decoding section 16 It is (step C15).

これにより、1セグメント放送の受信モードに切り替えられ、その1セグメント放送で送られてくる緊急警報が表示部19およびスピーカ20を通じて再生出される(ステップC16)。 Thus, 1 is switched to the reception mode segment broadcast, the 1 segment emergency alarm sent by broadcast is issued reproduced through the display unit 19 and the speaker 20 (step C16).

ここで、1セグメント放送の再生中に、TMCC検出部21によって検出される受信号の誤り率が監視されており、その誤り率が予め設定された閾値3以下であれば(ステップC17のNo)、そのまま同じチャンネルにて緊急警報の受信が続けられる(ステップC18のYes)。 Here, during the reproduction of the 1-segment broadcast, the error rate of the received No. detected by TMCC detection section 21 are monitored, if the error rate threshold 3 or less, which is set in advance (No in step C17) , it receives an emergency alarm is continued at the same channel (Yes in step C18). なお、上記閾値3は、図6に示した1セグメント放送受信用に設定されたものであり、上記閾値1,2とは無関係である。 Note that the threshold value 3 has been set for 1 segment broadcasting reception shown in FIG. 6, it is independent of the above-mentioned threshold 1,2.

緊急警報の放送が終了すると(ステップC18のNo)、切替え信号発生部23から1セグメント放送から12セグメント放送の受信モードへ切り替えるための信号がMPEGデコード部16に出力され、12セグメント放送の受信状態に戻る(ステップC19)。 Emergency the alarm broadcast is completed (No in step C18), the signal for switching from the switching signal generator 23 from the 1-segment broadcast to the reception mode of the 12-segment broadcast is output to the MPEG decoding unit 16, the reception state of the 12-segment broadcast Back to (step C19).

一方、1セグメント放送の再生中に受信信号の誤り率が閾値3を超えた場合には(ステップC17のYes)、受信状況が悪化したものと判断され、他のチャンネルにおいて緊急警報を受信するべくチャネルスキャンが実行される(ステップC20)。 On the other hand, if the error rate of the received signal exceeds the threshold value 3 during reproduction of 1-segment broadcast (Yes in step C17), it is determined that the reception status deteriorated, in order to receive emergency alert in other channels channel scan is executed (step C20). その結果、誤り率が閾値3以下で緊急放送を受信可能なチャンネルが検索された場合には(ステップC21のYes)、そのチャンネルへの設定変更がなされ、そのチャンネルで放送されている緊急警報が受信されて再生されることになる(ステップC22)。 As a result, if the error rate channels are available the emergency broadcast at the threshold 3 or less are searched (Yes in step C21), is made configuration changes to that channel, an emergency alert being broadcast on that channel is received will be reproduced (step C22). なお、緊急時には、特定の放送局に限らず、複数の放送局からほぼ同時に緊急警報が放送される。 Incidentally, in an emergency, not limited to the particular station, substantially simultaneously emergency alert from a plurality of broadcasting stations are broadcasting.

このように、1セグメント放送受信中における誤り率に応じて他のチャンネルへの切り替えを行うようにしたことで、例えば緊急警報を受信中に他の場所に移動するなどして受信状況が急に悪化したとしても、他のチャンネルにて引き続き緊急警報を受信することができる。 Thus, 1 in response to the error rate in the segment broadcasting reception that has to perform the switching to another channel, such as to suddenly reception status moves to another location while receiving an emergency alarm even worse, it is possible to continue to receive emergency alert at the other channel.

なお、上記各実施形態では、12セグメント放送と1セグメント放送を例にして説明したが、本発明はそのセグメント数に限定されるものではなく、第1の放送信号とその第1の放送信号よりも品質の低い第2の放送信号によって緊急警報が同時に送出されるようなシステムであれば、そのすべてに適用可能である。 In the above embodiments, although the 12-segment broadcast and the 1 segment broadcasting has been described as an example, the present invention is not limited to the number of the segment, a first broadcast signal and from its first broadcast signal if even a system such as an emergency alert by a second broadcasting signal having low quality is simultaneously transmitted, it is applicable to all.

要するに、本発明は上記各実施形態そのままに限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で構成要素を変形して具体化できる。 In summary, the present invention is not limited to the above embodiments, may be embodied with the components modified without departing from the scope of the invention. また、上記各実施形態に開示されている複数の構成要素の適宜な組み合わせにより、種々の発明を形成できる。 Also, by properly combining the structural elements disclosed in the above embodiments, various inventions can be formed. 例えば、実施形態に示される全構成要素から幾つかの構成要素を削除してもよい。 For example, it is possible to delete some of the components shown in the embodiments. さらに、異なる実施形態にわたる構成要素を適宜組み合わせてもよい。 It may be appropriately combined components in different embodiments.

図1は本発明の第1の実施形態に係る地上デジタル放送を受信可能な放送受信装置の構成を示すブロック図である。 Figure 1 is a block diagram showing a configuration of a first exemplary receivable broadcast receiving apparatus terrestrial digital broadcasting according to an embodiment of the present invention. 図2は第1の実施形態における放送受信装置の処理動作を示すフローチャートである。 Figure 2 is a flow chart showing a processing operation of the broadcast receiving apparatus in the first embodiment. 図3は第2の実施形態における放送受信装置の処理動作を示すフローチャートである。 Figure 3 is a flow chart showing the processing operation of the broadcast receiving apparatus in the second embodiment. 図4は第3の実施形態における放送受信装置の処理動作を示すフローチャートである。 Figure 4 is a flow chart showing the processing operation of the broadcast receiving apparatus in the third embodiment. 図5は地上デジタル放送方式に従ったセグメントの概念を説明するための図である。 Figure 5 is a diagram for explaining the concept of the segment in accordance with the digital terrestrial broadcasting system. 図6は12セグメント放送と1セグメント放送のエリアの説明するための図である。 6 is a diagram for explaining the 12-segment broadcast and the 1-segment broadcast area. 図7は地上デジタル放送におけるOFDM信号に含まれるTMCC信号の構成を説明するための図である。 Figure 7 is a diagram for explaining the configuration of the TMCC signal contained in the OFDM signal in the digital terrestrial broadcasting.

符号の説明 DESCRIPTION OF SYMBOLS

11…受信アンテナ、12…チューナ、13…OFDM復調部、14…誤り訂正部、15…多重分離部、16…MPEGデコード部、17…画像重畳部、18…制御部、19…表示部、20…スピーカ、21…TMCC検出部、22…BER検出部、23…切替え信号発生部、E1…12セグメント放送のエリア、E2…1セグメント放送のエリア、L1…12セグメント放送のエリアの半径、L2…1セグメント放送のエリアの半径、P0…放送局、Q…車両、D1…システム識別フラグ、D2…伝送パラメータ切替指標フラグ、D3…起動制御信号フラグ、D4…カレント情報フラグ、D5…ネクスト情報フラグ、D6…連結送信位相補正量。 11 ... receiving antenna, 12 ... tuner, 13 ... OFDM demodulation unit, 14 ... error correction section, 15 ... demultiplexing unit, 16 ... MPEG decoding unit, 17 ... image superimposing unit, 18 ... control unit, 19 ... display unit, 20 ... speaker, 21 ... TMCC detection unit, 22 ... BER detection unit, 23 ... switching signal generating unit, E1 ... 12 segment broadcasting area, E2 ... 1 segment broadcasting area, L1 ... 12 radius segment broadcast area, L2 ... the radius of the 1-segment broadcast area, P0 ... broadcasters, Q ... vehicle, D1 ... system identification flag, D2 ... transmission parameter switching index flag, D3 ... start control signal flag, D4 ... current information flag, D5 ... next information flag, D6 ... connected transmission phase correction amount.

Claims (5)

  1. 送信側から同時に送信される第1の放送信号と、この第1の放送信号よりも品質の低い第2の放送信号とを切り替えて受信可能な機能を備えた放送受信装置において、 In the broadcast receiver including a first broadcast signal transmitted from the transmitting side at the same time, the receivable functions by switching the low quality second broadcast signal than the first broadcast signal,
    上記第1の放送信号の受信中に上記第2の放送信号の受信が可能であるか否かを判断する第1の判断手段と、 A first determination means for determining whether it is possible to receive the second broadcast signal during reception of the first broadcast signal,
    この第1の判断手段によって上記第2の放送信号の受信が可能であると判断された場合に、緊急警報の有無を判断する第2の判断手段と、 If it is determined that it is possible to receive the second broadcast signal by the first determination means, second determination means for determining whether the emergency alert,
    この第2の判断手段によって緊急警報ありと判断された場合に、上記第1の放送信号から上記第2の放送信号の受信モードに切り替える受信モード切替え手段と を具備したことを特徴とする放送受信装置。 If it is determined that there is an emergency alert by the second determining means, broadcast reception, characterized by comprising a reception mode switching means for switching from said first broadcast signal receiving mode of the second broadcast signal apparatus.
  2. 上記受信モード切替え手段は、緊急警報の放送が終了したときのタイミングで、上記第1の放送信号の受信モードに戻すことを特徴とする請求項1記載の放送受信装置。 The reception mode switching means at a timing when the broadcast emergency alert is finished, the broadcast receiving apparatus according to claim 1, wherein the back to receive mode of the first broadcast signal.
  3. 受信信号の誤り率を検出する誤り率検出手段を備え、 With an error rate detecting means for detecting an error rate of the received signal,
    上記受信モード切替え手段は、上記第2の判断手段によって緊急警報ありと判断された場合に、上記誤り率検出手段によって検出された誤り率が通常放送時の切り替え条件である第1の閾値よりも低く設定された第2の閾値を超えている場合に上記第2の放送信号の受信モードに切り替えることを特徴とする請求項1記載の放送受信装置。 The reception mode switching unit, when it is determined that there is an emergency alert by said second determination means, than the first threshold detected error rate by the error rate detecting means is a switching condition during normal broadcast broadcast receiving apparatus according to claim 1, characterized in that the switch if it exceeds the second threshold value set lower in the reception mode of the second broadcast signal.
  4. 上記受信モード切替え手段は、緊急警報の放送終了後の誤り率が上記第1の閾値以下であった場合に上記第1の放送信号の受信モードに戻すことを特徴とする請求項3記載の放送受信装置。 The reception mode switching unit, broadcasting a broadcast after the end of the error rate of the emergency alert according to claim 3, wherein a back to receive mode of the first broadcast signal when was less than the first threshold value the receiving device.
  5. 上記受信モード切替え手段によって上記第2の放送信号の受信モードに切り替えられたときの受信信号の誤り率を検出する誤り率検出手段と、 And error rate detection means for detecting an error rate of the received signal when switched to the reception mode of the second broadcast signal by the reception mode switching unit,
    この誤り率検出手段によって検出された誤り率が上記第2の放送信号の受信用に設定された第3の閾値を超えていた場合に、上記誤り率が上記第3の閾値以下で緊急警報を受信可能な他のチャンネルを検索するチャンネル検索手段と をさらに具備したことを特徴とする請求項1記載の放送受信装置。 When the detected error rate by the error rate detecting means exceeds the third threshold value which is set for reception of the second broadcast signal, the error rate is the emergency alert below said third threshold value It broadcast receiving apparatus according to claim 1, characterized in that further comprising a channel searching means for searching the receivable other channels.
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