EP1024614A2 - Récepteur pour la réception de la radiodiffusion numérique DAB - Google Patents

Récepteur pour la réception de la radiodiffusion numérique DAB Download PDF

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Publication number
EP1024614A2
EP1024614A2 EP20000300331 EP00300331A EP1024614A2 EP 1024614 A2 EP1024614 A2 EP 1024614A2 EP 20000300331 EP20000300331 EP 20000300331 EP 00300331 A EP00300331 A EP 00300331A EP 1024614 A2 EP1024614 A2 EP 1024614A2
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EP
European Patent Office
Prior art keywords
program
data
frequency
service
received
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.)
Withdrawn
Application number
EP20000300331
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German (de)
English (en)
Inventor
Masashi Kimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
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Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Publication of EP1024614A2 publication Critical patent/EP1024614A2/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/38—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
    • H04H60/41—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
    • H04H60/43—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas for identifying broadcast channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/29—Arrangements for monitoring broadcast services or broadcast-related services
    • H04H60/31—Arrangements for monitoring the use made of the broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]

Definitions

  • the present invention relates to a digital audio broadcasting (DAB) receiver.
  • DAB digital audio broadcasting
  • Europe there has been performed digital audio broadcasting (DAB) which conforms to the Eureka 147 Standard).
  • This DAB can simultaneously broadcast up to 64 sets of digital audio signals and digital data by employing the specifications of: transmission bandwidth: 1.5 MHz, modulation system: orthogonal frequency division multiplex (OFDM), and data compression of audio signal: layer II of MPEG audio.
  • OFDM orthogonal frequency division multiplex
  • DAB program broadcast is performed in the hierarchical structure, for example, as illustrated in Fig. 7.
  • DAB uses the transmission band of 1.5 MHz for a channel as explained above but this transmission channel is called “ensemble” and this "ensemble” is selected by tuning the transmission frequency to the centre frequency of this ensemble.
  • This ensemble is divided into the groups called “services”. In the case of Fig. 7, the ensemble is divided into four services. This service is further divided to several "service components" and each service component is composed of the digital audio signal or digital data, forming a program.
  • a service corresponds to one broadcast station of the FM broadcast.
  • the ensemble is given the identification code called the "ensemble ID" and the data of this ensemble ID is also transmitted.
  • the data which is called as "program type" to indicate such service genre, for example, as illustrated in Fig. 8 is also transmitted to the service.
  • the service component is given the serial number in the respective services and this serial number is also transmitted.
  • the service of desired genre can be retrieved and received using the program type as a keyword.
  • format of ensemble can be changed as desired by a broadcast station.
  • the service 1 is prepared only when a soccer game is carried out and the soccer game of each place is broadcast and when a soccer game is not carried out, service 1 is ceased (not included in the ensemble). Therefore, when it is requested to enjoy a certain service, it is impossible to enjoy the service because this service is ceased.
  • routine 900 illustrated in Fig. 9, for example, is executed by a microcomputer.
  • the service of the target genre can be selected and received automatically.
  • routine 900 explained above, the process that ensemble is detected while seeking the frequency band of DAB and the service of target genre is retrieved for such ensemble is repeated to receive the service of target genre.
  • the frequency band of DAB many ensembles are prepared.
  • a digital audio broadcasting receiver for broadcasting, with a broadcast signal, a plurality of program groups and program data of respective program contents of such program groups, wherein:
  • the target service is therefore retrieved from the history table of ensemble received in the past.
  • the broadcast signal of DAB is received with an antenna 11 and this receiving signal is supplied to a tuner circuit 12.
  • This tuner circuit 12 is formed as the super-heterodyne system including PLL circuit. Therefore, the receiving frequency can be changed by changing a frequency dividing ratio N of the variable frequency dividing circuit of PLL.
  • This tuner circuit 12 outputs a baseband signal of DAB and this baseband signal is supplied to an A/D converter circuit 13 for the purpose of A/D conversion to provide a digital signal.
  • This digital signal is supplied to an orthogonal demodulating circuit 14 and thereby the in-phase element (real axis element) and orthogonal element (imaginary axis element) are demodulated. These data are then subjected to the complex Fourier transformation in the fast Fourier transform (FFT) circuit 15 and the frequency element is output for each symbol.
  • FFT fast Fourier transform
  • This output frequency element is supplied to a Viterbi decoder circuit 16 for the purpose of deinterleave and error correction and thereby the digital audio data of the target service component (program) can be selected.
  • the selected data is then supplied to an audio decoder circuit 17 for the purpose of decoding process such as MPEG data expansion and the decoder circuit 17 extracts the digital audio data of the target program.
  • the extracted digital audio data is then supplied to the D/A converter circuit 18 for the purpose of conversion to the analog audio signals L, R through the D/A conversion and these signals R, L are then supplied to the speakers 21l, 21R through the amplifiers 19L, 19R, thus enabling the listeners to listen the audio broadcasting.
  • a microcomputer 31 for system control is also provided as control means and the data of frequency dividing ratio N of the variable frequency dividing circuit in PLL is supplied to the tuner circuit 12 from this microcomputer 31 as the frequency data for selecting ensemble (receiving frequency).
  • the data required for discriminating or identifying the service and service component namely the data such as program type is extracted from the Viterbi decoder circuit 16 and this data is supplied to the microcomputer 31.
  • a selection signals SSV, SSC are supplied to the Viterbi decoder circuit 16 from the microcomputer 31 in order to select the service with the signal SSV and the digital audio data of the target service component is selected from the selected service with the signal SSC.
  • the microcomputer 31 is provided, for example, with a retrieving and receiving routine 100 as illustrated in Fig. 2 as a part of the program to be executed in the microcomputer 31.
  • a retrieving and receiving routine 100 as illustrated in Fig. 2 as a part of the program to be executed in the microcomputer 31.
  • this routine 100 only the part in relation to this invention is illustrated in Fig. 2 as will be explained later.
  • the microcomputer 31 is also provided with a memory 32.
  • This memory 32 is formed, for example, of a flash memory or of a RAM, although not illustrated, which is provided with a battery for the back up purpose. Namely the memory 32 is formed of a non-volatile memory and thereby the written data is held even if the power supply is turned OFF.
  • This memory 32 is provided, as illustrated for example in Fig. 3, a history table HTBL indicating the history of ensembles received in the past.
  • a set of data is formed of the frequency dividing ratio N of the variable frequency dividing circuit in the PLL of the tuner circuit 12, ensemble ID and receiving time (date and time) as the data when the desired service is received and a plurality of these data are stored and held in this history table HTBL.
  • the frequency dividing ratio N1, ensemble ID (ENID01), receiving time TIME01 are held in he first line as the data when a program of a certain DAB station is received.
  • the microcomputer 31 is connected with a clock circuit 33 for clocking the current time.
  • a clock circuit 33 for clocking the current time.
  • various manipulation keys 34 formed, for example, of a push switch and is also connected with a display element, for example, LCD35 to display various pieces of information.
  • the history table HTBL is updated. Namely, when the ensemble selected by the key manipulation is not included in the history table HTBL, a set of data of frequency dividing ratio N, ensemble ID and time indicated by the clock circuit 33 is added to the history table HTBL. In addition, when the ensemble selected by the key manipulation is included in the history table HTBL, the receiving time (receiving time of the same line) pairing a set with the frequency dividing ratio N in the history table HTBL is updated to the current time clocked by the clock circuit 33.
  • the frequency dividing ratio N, ensemble ID and receiving time of the final reception are registered for the ensemble received in the past in the history table HTBL.
  • This history table HTBL is sorted, when contents thereof are updated, so that a set of the data of the latest receiving time is defined as the first set of data.
  • the program indicating the genre on which the cursor is located is once stored in the microcomputer 31.
  • the process in the microcomputer 31 is started from the step 101 of the routine 100 and it is next determined in the step 102 whether reception is executed or not for all frequency dividing ratios N registered in the history table HTBL.
  • the process goes to the step 103 from the step 102.
  • the frequency dividing ratio N of the frequency not received in the history table HTBL is read from the history table HTBL and is then set to the tuner circuit 12, namely the receiving frequency is set.
  • step 104 it is determined whether the ensemble can be received or not in the current receiving frequency. If, the ensemble cannot be received, the process returns to the step 102 from the step 104. Accordingly, the processes from the step 102 to the step 104 are repeated until the ensemble can be received. In this case, ensemble is updated.
  • the process goes to the step 111 from the step 104.
  • the history table HTBL is updated.
  • the receiving time forming a pair with the frequency dividing ratio N (frequency dividing ratio N set in the step 103) giving the current receiving frequency of the history table HTBL is updated to the current time clocked by the clock circuit 33.
  • this retrieval is executed by checking whether the program type once registered in the microcomputer 31 immediately before execution of this routine 100 is included or not in the ensemble being received.
  • the process returns to the step 102 from the step 113. Therefore, the processes from the step 102 to the step 103 are repeated until the service of the target genre is included in the ensemble being received. In this case, the ensemble is updated.
  • the process goes to the step 121 from the step 113.
  • the selection signal SSV for designating the service of target genre service of the program type once registered in the microcomputer 31 immediately before execution of this routine 100
  • the selection signal SSC for designating the first service component for example, in this service are supplied to the Viterbi decoder circuit 16 for the purpose of service selection and the service component is also selected.
  • this routine 100 is completed in the step 122.
  • the target genre can be selected and received and thereby a program of the target genre can be received.
  • the process goes to the step 131 from the step 102.
  • this step 131 it is displayed, for example, on the LCD35 that the service of the target genre is not yet transmitted in current. Thereafter, the routine 100 is completed in the step 122.
  • the service of target genre is retrieved by receiving the ensemble which has been once received, the service of the target genre can be received within a short period of time.
  • Fig. 4 is the flowchart of the process in which the service of the target genre is retrieved with the ensemble not registered in the history table HTBL in such a case that service of the target genre cannot be received in the ensemble registered in the history table HTBL.
  • the process up to the step 122 from the step 102 is structured like the routine 100 of Fig. 2 even in the routine 200 of Fig. 4. Therefore, when service of the target genre is included in the ensemble registered in the history table HTBL, this service can be received within a short period of time as explained above.
  • step 102 determines whether there is a frequency dividing ratio N which is not yet registered in the history table HTBL and is never executed for retrieval of service.
  • the process goes to the step 242 from the step 241.
  • the frequency dividing ratio N which is not yet executed for retrieval of service is set to the tuner circuit 12 and thereafter the process goes to the step 104.
  • the history table HTBL is updated in the step 111 and a set of frequency dividing ratio N, ensemble ID and time indicated by the clock circuit 33 is added to the history table HTBL.
  • the process goes to the step 251 from the step 241.
  • the step 251 it is displayed, for example, on the LCD35 that service of the target genre is not yet transmitted in current and thereafter the routine 200 is completed in the step 122.
  • the process up to the step 251 from the step 101 is structured like those in the routine 200, the step 301 is provided between the step 101 and step 102.
  • the step 301 it is determined whether the program type of service of the other ensemble is transmitted or not.
  • the process goes to the step 302 from the step 301.
  • this step 302 it is retrieved whether there is a program type of the target service in the program type of the service in the other ensemble being transmitted.
  • the process goes to the step 303 from the step 302.
  • the receiving frequency is set to t he ensemble including the target service and thereafter the process goes to the step 104. Subsequently, the retrieval and reception of the target service are executed.
  • step 301 when the program type of the service in the other ensemble is not transmitted and when there is no program type of the target service in the program type of the service in the other ensemble transmitted in the step 302, the process goes to the step 102 from the step 301 or 302 and thereafter the retrieval process is executed as explained above.
  • the process when the ensemble cannot be received in the step 104, the process returns to the step 301 from 104. Moreover, in the step 113, when service of the target genre is not included in the receiving ensemble, the process returns to the step 301 from the step 113.
  • routine 300 when the program type of t he service in the other ensemble is transmitted as the data of the other station, retrieval and reception of the target service are executed using such data and therefore the target service can be received within a shorter period of time.
  • a user when the target service is retrieved and received, a user can select the first retrieval and receiving mode only for the ensemble registered in the history table HTBL and also can further select the second retrieval and receiving mode for retrieving the ensemble not registered in the history table HTBL in such a case that the target service cannot be received in this retrieval and receiving mode.
  • a user previously sets by manipulating the key 34 that retrieval should be done with any mode of the first retrieval and receiving mode and second retrieval and receiving mode.
  • the routine 400 executes the process goes to the step 401 after the step 101.
  • the step 401 it is determined that the retrieval and receiving mode is set to the first retrieval and receiving mode or second retrieval and receiving mode.
  • the process goes to the step 102 of the routine 100 from the step 401.
  • the retrieval and receiving mode is set to the second retrieval and receiving mode, the process goes to the step 102 of the routine 200 from the step 401.
  • the target service when the retrieval and receiving mode is set to the first retrieval and receiving mode depending on the object of user, the target service can be received within a shorter period of time and when it is set to the second retrieval and receiving mode, a certain time may be required for reception but the target service can surely be received. Accordingly, data receiving can be realized depending on the condition which a user desires.
  • the receiving frequency is set to the ensemble registered in the history table HTBL in the routines 100 to 400, if such ensemble cannot be received, a set of data regarding such ensemble may be deleted from the history table HTBL.
  • the broadcasting of the target genre can be searched for and listened to within a short period of time. Moreover, it can surely be retrieved. In addition, the broadcast of the target genre can surely be received within a short period of time depending on the object of user.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
EP20000300331 1999-01-20 2000-01-18 Récepteur pour la réception de la radiodiffusion numérique DAB Withdrawn EP1024614A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP01168899A JP4214332B2 (ja) 1999-01-20 1999-01-20 デジタル音声放送の受信機
JP1168899 1999-01-20

Publications (1)

Publication Number Publication Date
EP1024614A2 true EP1024614A2 (fr) 2000-08-02

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EP20000300331 Withdrawn EP1024614A2 (fr) 1999-01-20 2000-01-18 Récepteur pour la réception de la radiodiffusion numérique DAB

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JP (1) JP4214332B2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002011328A1 (fr) * 2000-07-28 2002-02-07 Sony Corporation Systeme de radiodiffusion numerique
WO2002032024A2 (fr) * 2000-10-11 2002-04-18 Thomson Licensing S.A. Radio personnalisable
CN101917240A (zh) * 2010-08-06 2010-12-15 华为终端有限公司 一种移动终端调频广播的频道设置方法及移动终端
CN101980462A (zh) * 2010-08-24 2011-02-23 成都纽斯达电子有限责任公司 一种drm数字音频广播节目搜台方法
CN102332293A (zh) * 2011-07-22 2012-01-25 重庆长安汽车股份有限公司 一种车载数字音乐播放器

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002011328A1 (fr) * 2000-07-28 2002-02-07 Sony Corporation Systeme de radiodiffusion numerique
US7475418B2 (en) 2000-07-28 2009-01-06 Sony Corporation Digital broadcasting system and method for automatically locating programs after relocation
WO2002032024A2 (fr) * 2000-10-11 2002-04-18 Thomson Licensing S.A. Radio personnalisable
WO2002032024A3 (fr) * 2000-10-11 2002-09-26 Thomson Licensing Sa Radio personnalisable
KR100879936B1 (ko) * 2000-10-11 2009-01-22 톰슨 라이센싱 라디오 정보를 송신하기 위한 방법 및 장치와, 전용화된 라디오 프로그램을 생성하기 위한 방법 및 장치
CN101917240A (zh) * 2010-08-06 2010-12-15 华为终端有限公司 一种移动终端调频广播的频道设置方法及移动终端
CN101980462A (zh) * 2010-08-24 2011-02-23 成都纽斯达电子有限责任公司 一种drm数字音频广播节目搜台方法
CN102332293A (zh) * 2011-07-22 2012-01-25 重庆长安汽车股份有限公司 一种车载数字音乐播放器

Also Published As

Publication number Publication date
JP2000209167A (ja) 2000-07-28
JP4214332B2 (ja) 2009-01-28

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