WO2001050649A1 - Procede de reduction de consommation d'energie et dispositif correspondant - Google Patents

Procede de reduction de consommation d'energie et dispositif correspondant Download PDF

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Publication number
WO2001050649A1
WO2001050649A1 PCT/SE2000/002261 SE0002261W WO0150649A1 WO 2001050649 A1 WO2001050649 A1 WO 2001050649A1 SE 0002261 W SE0002261 W SE 0002261W WO 0150649 A1 WO0150649 A1 WO 0150649A1
Authority
WO
WIPO (PCT)
Prior art keywords
information
interest
receiver
available
channel
Prior art date
Application number
PCT/SE2000/002261
Other languages
English (en)
Inventor
Jan Ossfeldt
Erik Nordmark
Original Assignee
Teracom Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Teracom Ab filed Critical Teracom Ab
Priority to AU15664/01A priority Critical patent/AU1566401A/en
Priority to EP00978179A priority patent/EP1247363A1/fr
Publication of WO2001050649A1 publication Critical patent/WO2001050649A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/42—Arrangements for resource management
    • H04H20/426—Receiver side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/16—Arrangements for broadcast or for distribution of identical information repeatedly
    • 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
    • H04H60/25—Arrangements for updating broadcast information or broadcast-related information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/57—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for mobile receivers
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates generally to a method and a device for lowering the power consumption of radio frequency receiver, especially receivers that can receive digital audio broadcasting (DAB) , portable, mobile or stationary.
  • DAB digital audio broadcasting
  • Digital radio broadcasting is a relatively new method of broadcasting radio and information. Primarily it was intended as a new radio broadcasting system to mobile, portable and stationary receivers, and is now also increasing in popularity in data applications.
  • DAB is relatively broadband with a useful transport bit rate of approximately 0. 6 to 1.8 Mbit/second in dependence on the specific implementation. Its increased popularity for broadcasting information other than digital sound is probably due to its capacity, relatively low cost for transfer per unit of data, coverage, and the robustness of information transfer.
  • the robustness of information transfer is necessary for it to be useful for information transfer in a simplex system without a feedback channel.
  • the robustness is at least in part due to time and frequency interleaving of a main service channel (MSC) where the information is transferred.
  • MSC main service channel
  • DAB receivers have been able to use DAB receivers in conjunction with handheld and laptop computers .
  • Handheld and laptop computers are low power consumers to be able to offer long operating times with battery usage only.
  • Peripherals connected to or integrated into handheld and laptop computers therefore need to be low power consumers .
  • a standard DAB receiver is not optimized for low power consumption. There is thus a- need to lower the power consumption of DAB receivers.
  • An object of the invention is to define a method for reducing the power consumption of a DAB receiver.
  • Another object of the invention is to define a DAB receiver with low power consumption.
  • the aforementioned objects are achieved according to the invention by a method of reducing power consumption in a digital audio broadcasting receiver by only deinterleaving information of interest that has not previously been deinterleaved, and a receiver carrying out the method.
  • the aforementioned objects are also achieved according to the invention by a method of reducing power consumption in a digital audio broadcasting receiver when receiving a signal including information of interest.
  • the method comprises a number of steps in the digital audio broadcasting receiver. In a first step receiving a radio frequency signal including the
  • a third step only deinterleaving the parts of the main service channel that includes the information of interest if it was determined that the information of interest is not available in the receiver.
  • a fourth step making the deinterleaved information of interest available in the receiver.
  • the step of determining if the information of interest is available in the receiver comprises substeps.
  • the method comprises the step of broadcasting directory information in the fast information channel, in a digital audio broadcasting transmitter broadcasting the signal including information of interest.
  • the step of determining if the information of interest is available in the receiver comprises other substeps.
  • the method comprises the step of broadcasting directory information in the directory channel in the main service channel, in a digital audio broadcasting transmitter broadcasting the signal including information of interest.
  • the directory channel is a dedicated subchannel in the main service channel.
  • the information of interest is broadcasted in entities of data files or data carousels, where each unique data file or unique data carousel is assigned a specific version number, the version number being used to determine if the information of interest is available in the receiver.
  • the aforementioned objects are achieved in accordance with the invention also by a digital audio broadcasting receiver with reduced power consumption when receiving a signal including information of interest.
  • the receiver comprises a number of means arranged to carry out the invention.
  • a first means is arranged to receive a radio frequency signal including the information of interest in frames, which frames comprises a main service channel.
  • a second means is arranged to determine if the information of interest is available in the receiver.
  • a third means is arranged to control a deinterleaver means to only deinterleave the parts of the main service channel that includes the information of interest if it was determined that the information of interest is not available in the receiver.
  • a fourth means is arranged to make the deinterleaved information of interest available in the receiver.
  • the aforementioned objects are also achieved according to the invention by a method of reducing power consumption in a digital audio broadcasting receiver when receiving a signal including information of interest broadcasted by a digital audio broadcasting transmitter.
  • the method comprises a number of steps in the digital audio broadcasting transmitter.
  • a first step assigning an identity to an entity of the information of interest, each identical entity of the information of interest being assigned an identical identity.
  • a second step broadcasting the identity of an entity of the information of interest.
  • a third step broadcasting the entity of the information of interest.
  • an entity of the information of interest is a data file or a data carousel.
  • the assigned identities are version numbers.
  • the assigned identities are broadcasted in a fast information channel.
  • the assigned identities are broadcasted in a sub-channel comprised in a master service channel.
  • Fig. 1 shows a block diagram of one DAB frame
  • Fig. 2 shows a block diagram of a digital audio broadcasting (DAB) transmitter
  • Fig. 3 shows a block diagram of a digital audio broadcasting (DAB) receiver
  • Fig. 4 shows a time diagram of a DAB data carousel transmission and reception according to the invention
  • Fig. 5 shows a time diagram of a DAB data file transmission and reception according to the invention
  • Fig. 6 shows a flow chart of a basic method of reducing power consumption in a digital audio broadcasting receiver according to the invention
  • Fig. 7 shows a flow chart of a first specific method according to the invention.
  • Fig. 8 shows a flow chart of a second specific method according to the invention.
  • FIG. 1 shows a block diagram of one DAB frame, which is provided for a deeper understanding of the DAB system.
  • DAB frames are sent in succession.
  • a DAB frame mainly comprises a synchronization channel 101, 102, a fast information channel (FIC) 103, and a main service channel (MSC) 104.
  • the synchronization channel 101, 102 comprises a null symbol 101 and at least one phase reference symbol 102.
  • the fast information channel (FIC) 103 is, for example, used for multiplex configuration information (MCI) and service information (SI) .
  • the main service channel 104 carries the desired useful information, which can be a number of coded audio programs/channels, one or more digital information transfers, or a combination of these.
  • a DAB frame is configured to provide a robust way of transferring information, i.e. packets of digital information, from a transmitter to a receiver without any feedback through, for example, a back channel.
  • FIG. 2 shows a block diagram of a digital audio broadcasting (DAB) transmitter 200.
  • DAB frames which make up a DAB signal, are assembled in the transmitter before transmission/broadcasting.
  • Packets of digital information 201, 203 such as sound services 201 and data services 203, are first coded 210, 211, 212, 213, error protected, and then time interleaved 214, 215. These are thereafter multiplexed 220, 222 into the main service channel together with other optional services 202, 204, according to a predetermined, but changeable, service configuration 205.
  • the multiplexer output is frequency interleaved 226 and combined with multiplex control and service information 205 which travel in the fast information channel 224 in order to avoid the time interleaving process.
  • OFDM orthogonal frequency division multiplexing
  • QPSK differential quadrature phase-shift keying
  • FIG. 3 shows a block diagram of a digital audio broadcasting receiver 300.
  • the receiver 300 comprises an antenna 302, a tuner 304, an analog to digital converter process 306, an information path 308 that runs the desired information through the receiver 300, a Fast Frequency Transform (FFT) and differential demodulation stage 312, a time and frequency deinterleaver and error corrector processes 314, optionally an audio decoder process 322, optionally one or more speaker (s) 324, a data decoder process 332, one or more connections of data information to data services 334, a user interface 342, a controller and synchronizer 344, and a data/control buss 346.
  • FFT Fast Frequency Transform
  • differential demodulation stage 312 a time and frequency deinterleaver and error corrector processes 314, optionally an audio decoder process 322, optionally one or more speaker (s) 324, a data decoder process 332, one or more connections of data information to data services 334, a user interface 342, a
  • a digital audio broadcasting receiver 300 Most of the functionality of a digital audio broadcasting receiver 300 is usually performed in one or more digital processors such as digital signal processors.
  • a digital audio broadcasting receiver might just as well be implemented with discrete hardware blocks or anything in between, for example the tuner 304 and analog to digital converter 306 are with current technology preferably implemented as discrete hardware.
  • a via the antenna 302 received signal is selected, down- converted and quadrature demodulated in the tuner 304 before applying it to the analog to digital converter 306. Thereafter, the receiver performs FFT and differential demodulation 312 followed by time and frequency de- interleaving and error correction 314 to output the original coded services data.
  • the deinterleaved data can then be either put into an audio decoder 322 for sound reproduction through one or more speakers 324 or be put into a data decoder 332 for the sending desired data 334 to other processes or devices.
  • the controller and synchronizer 344 will ensure that data flows correctly through the receiver according to inputs and indication to the user interface 342, which might be a panel or another computer or process.
  • the first type of information transfer is based on the assumption that the information provider does not know when a single receiver is turned on and therefore to ensure that all receivers are to be able to receive all the information of interest, continuously transmits the information over and over again.
  • This type of information transfer is often referred to as using data carousels.
  • a service provider could, for example, have a total of 50 pieces of information to broadcast. These 50 pieces of information are then continuously transferred, starting with the first one, then the second one and so on until the fiftieth has been transferred, then the procedure starts all over again with transferring the first piece of information again, and then the second one again and so on.
  • This type of information transfer is for example used for Teletext systems.
  • the second type of information transfer is based on the assumption that all interested receivers are more or less continuously tuned in and waiting for new updated information.
  • a receiver keeps track of what information it has already received and thus it does not deinterleave the MSC for information the receiver already has. Even though the information might be information of interest, it might be redundant, i.e. not necessary to receive again. If the MSC does not comprise any information of interest at all then it is not necessary to deinterleave the MSC at all.
  • Figure 4 shows a time diagram of a DAB data carousel transmission 410 and reception 430 according to the invention.
  • a top line indicates the activity of an MSC channel with interesting information 410 over time.
  • a middle line indicates the activity of a directory 420 subchannel in the MSC or FIC, over time.
  • a bottom line indicates the activity over time of the deinterleaver deinterleaving 430 the MSC channel with interesting information.
  • data carousels are labeled with version numbers to thereby be able to keep track of what is transmitted and what is available in a receiver and what is not, in an efficient manner.
  • each version of a data carousel is given a version number, which means that when information in the data carousel is changed/updated, then a new version number is assigned to the data carousel.
  • a receiver can determine if it has received/stored the information of a specific version of a data carousel, or not.
  • the version number of a currently broadcasting, or to be broadcasted, data carousel is transferred 421, 422, 423, 424 in a sub-channel in the MSC or in the FIC, in dependence on the specific embodiment.
  • a deinterleaver of a receiver only has to deinterleave 432, 434 a desired channel when there is information of interest in that channel that has not been received before.
  • the version number is preferably at least transferred 421, 423 just before the first time a new version is broadcasted, to thereby enable the deinterleaver to wake-up in time to deinterleave the channel of interest.
  • a corresponding version number is repetetively transferred 421, 422, 423, 424 at least once for each broadcasting of a data carousel .
  • Figure 5 shows a time diagram of a DAB data file transmission 510 and reception 530 according to the invention.
  • Figure 5 shows another manner of transferring information.
  • Figure 5 shows a top line indicates the activity of an MSC channel with interesting information 510 over time.
  • a middle line indicates the activity of a directory 520 sub-channel in the MSC or FIC, over time.
  • a bottom line indicates the activity over time of the deinterleaver deinterleaving 530 the MSC channel with interesting information.
  • data files are labeled with version numbers to thereby be able to keep track of what file is transmitted and which files are available in a receiver and which are not, in an efficient manner.
  • each file 512, 514, 515 being broadcasted one or more times.
  • interesting information of a data file version one 512 is broadcasted once
  • interesting information of the data file version two 514, 515 is broadcasted twice.
  • each version of a data file is given a version number.
  • the version number of a currently broadcasting, or to be broadcasted, data file is transferred 521, 522, 523, 524, 525 in a sub-channel in the MSC or in the FIC, in dependence on the specific embodiment.
  • a deinterleaver of a receiver only has to deinterleave 532, 534 a desired channel when there is information of interest in that channel that has not been received before.
  • the version number is preferably at least transferred 521, 523 just before the first time a new version is broadcasted, to thereby enable the deinterleaver to wake-up in time to deinterleave the channel of interest.
  • a corresponding version number is repetetively transferred 521, 522, 523, 524, 525 at least once for each broadcasting of a data file.
  • Figure 6 shows a flow chart of an example of a basic method of reducing power consumption in a digital audio broadcasting receiver according to the invention.
  • the receiver receives information/data and possibly information of interest in DAB frames.
  • a second step 620 it is checked to determine if information of interest, which is received, or the receiver will receive, is available in the receiver. If it is determined that the information of interest is not available in the receiver then the procedure continues with a third step 630.
  • the third step 630 deinterleaves only parts of the MSC which comprise information interest which is not available in the receiver.
  • a fourth step 640 the newly received and deinterleaved information of interest is made available and also marked as available in the receiver. The procedure will then preferably continue with the first step 610 again. If, in the second step 620, it was determined that the information of interest was available in the receiver, then the MSC would not be deinterleaved, but the procedure would simply continue with the first step 610.
  • Figure 7 shows a flow chart of a first specific method according to the invention, specifically it shows an expansion of the second step 620 of Figure 6. From the first step 610 of Figure 6, the procedure continues with a first expanded step 721.
  • the first expanded step 721 deinterleaves an information channel of the MSC and extracts information about what information is available in the received MSC and/or what information will be available in the MSC. This information channel should be as small as possible and only comprise an absolute minimum of information. Since it is relatively small the receiver will not waste much power when deinterleaving it.
  • the second expanded step 723 determines if the information that is available in the received MSC and/or the information that will be available in the MSC is some information of interest. If it is determined that the MSC comprises some information of interest then the procedure continues with a third expanded step 725. On the other hand if it is determined that the MSC does not comprise any information of interest, then the procedure continues with the first step 610 of Figure 6.
  • the third expanded step 725 determines if the information of interest that is available in the MSC and/or will become available, is available in the receiver or not. If the information of interest is not available in the receiver then the procedure will continue with the third step 630 of Figure 6. On the other hand if the information of interest is available in the receiver, then the procedure will continue with the first step of Figure 6 without deinterleaving the MSC any further.
  • Figure 8 shows a flow chart of a second specific method according to the invention, specifically it also shows an expansion of the second step 620 of Figure 6.
  • the first expanded step 822 decodes the FIC and extracts information about what information is available in the received MSC and/or what information will be available in the MSC.
  • the procedure continues with a second expanded step 824.
  • the second expanded step 824 determines if the information that is available in the received MSC and/or the information that will be available in the MSC is some information of interest. If it is determined that the MSC comprises some information of interest then the procedure continues with a third expanded step 826.
  • the third expanded step 826 determines if the information (of interest that is available in the MSC and/or will become available, is available in the receiver or not. If the information of interest is not available in the receiver then the procedure will continue with the third step 630 of Figure 6. On the other hand if the information of interest is available in the receiver, then the procedure will continue with the first step 610 of Figure 6 without deinterleaving the MSC.
  • the present invention can be put into apparatus-form either as pure hardware, as pure software or as a combination of hardware and software. If the method according to the invention is realized in the form of software, it can be completely independent or it can be one part of a larger program.
  • the software can suitably be located in a general-purpose computer or in a dedicated computer.
  • the invention can basically be described as a device and a method which provide means to enable a lower power consumption of a digital audio broadcasting receiver when receiving information, especially information that is not continuously changed/updated.
  • FIG 1 a block diagram of one DAB frame
  • FIG 2 a block diagram of a digital audio broadcasting transmitter
  • FIG 3 a block diagram of a digital audio broadcasting receiver, 300 an example of a digital audio broadcasting receiver where the invention is' suitably implemented,
  • FIG 4 shows a time diagram of a DAB data carousel transmission and reception according to the invention, 410 MSC channel with interesting information
  • FIG 5 shows a time diagram of a DAB data file transmission and reception according to the invention
  • FIG 6 a flow chart of a basic method of reducing power consumption in a digital audio broadcasting receiver according to the invention
  • 610 from fourth step or yes from second step (or no from second expanded step or yes from third expanded step of Fig. 7, or no from second expanded step or yes from third expanded step of Fig. 8) : first step/state receiving information of interest in DAB frames, 620 from first step: second step, check to see if information of interest, which is received, or the receiver will receive, is available in the receiver ? 630 no from second step (or no from third expanded step of Fig. 7, or no from third expanded step of Fig. 8) : third step, deinterleave only parts, which comprise information interest, which is not available in the receiver, 640 from third step: fourth step, make and mark newly received and deinterleaved information of interest available in the receiver.
  • FIG 8 expansion of second step of Fig. 6 according to a second specific method according to the invention
  • second expanded step is the information that is available in the received MSC and/or the information that will be available in the MSC any information of interest? yes from the second expanded step: third expanded step, is the information of interest that is available and/or will be available, is it available in the receiver ?

Abstract

L'invention concerne un procédé de réduction de la consommation d'énergie d'un récepteur de radiodiffusion numérique par simple désentrelacement des informations intéressantes n'ayant pas été précédemment désentrelacées.
PCT/SE2000/002261 1999-12-29 2000-11-17 Procede de reduction de consommation d'energie et dispositif correspondant WO2001050649A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU15664/01A AU1566401A (en) 1999-12-29 2000-11-17 Power reduction method and device therefore
EP00978179A EP1247363A1 (fr) 1999-12-29 2000-11-17 Procede de reduction de consommation d'energie et dispositif correspondant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9904846A SE9904846D0 (sv) 1999-12-29 1999-12-29 Power reduction method and device therefore
SE9904846-4 1999-12-29

Publications (1)

Publication Number Publication Date
WO2001050649A1 true WO2001050649A1 (fr) 2001-07-12

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ID=20418361

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/SE2000/001861 WO2001050647A1 (fr) 1999-12-29 2000-09-26 Procede permettant de reduire la consommation d'energie d'un recepteur de radiodiffusion numerique
PCT/SE2000/002261 WO2001050649A1 (fr) 1999-12-29 2000-11-17 Procede de reduction de consommation d'energie et dispositif correspondant

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Application Number Title Priority Date Filing Date
PCT/SE2000/001861 WO2001050647A1 (fr) 1999-12-29 2000-09-26 Procede permettant de reduire la consommation d'energie d'un recepteur de radiodiffusion numerique

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EP (2) EP1245089A1 (fr)
AU (2) AU7820400A (fr)
SE (1) SE9904846D0 (fr)
WO (2) WO2001050647A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3899675B2 (ja) * 1998-05-20 2007-03-28 ソニー株式会社 放送信号受信装置
KR100595208B1 (ko) * 2004-03-19 2006-07-03 엘지전자 주식회사 Ｄｍｂ 수신기 및 소비 전력 절감 방법
KR100664178B1 (ko) * 2004-11-13 2007-01-04 엘지전자 주식회사 디지털 멀티미디어 방송 수신기의 채널 정보 갱신 방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5493709A (en) * 1992-10-02 1996-02-20 Robert Bosch Gmbh Radio receiver for receiving digitally coded information including location and frequency data of a transmitter
WO1998057497A1 (fr) * 1997-06-11 1998-12-17 Koninklijke Philips Electronics N.V. Technique de commande de reception dans un recepteur de radiodiffusion de donnees
WO1999014775A1 (fr) * 1997-09-17 1999-03-25 Teracom Ab Procede de demande et de transfert d'information dans un systeme de radiodiffusion audionumerique
EP0959574A2 (fr) * 1998-05-20 1999-11-24 Sony Corporation Système pour limiter la consommation énergétique d'un récepteur de radiodiffusion, comportant un système d'alimentation intermittente de certains circuits pendant les périodes de réception des données pertinentes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5493709A (en) * 1992-10-02 1996-02-20 Robert Bosch Gmbh Radio receiver for receiving digitally coded information including location and frequency data of a transmitter
WO1998057497A1 (fr) * 1997-06-11 1998-12-17 Koninklijke Philips Electronics N.V. Technique de commande de reception dans un recepteur de radiodiffusion de donnees
WO1999014775A1 (fr) * 1997-09-17 1999-03-25 Teracom Ab Procede de demande et de transfert d'information dans un systeme de radiodiffusion audionumerique
EP0959574A2 (fr) * 1998-05-20 1999-11-24 Sony Corporation Système pour limiter la consommation énergétique d'un récepteur de radiodiffusion, comportant un système d'alimentation intermittente de certains circuits pendant les périodes de réception des données pertinentes

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Publication number Publication date
SE9904846D0 (sv) 1999-12-29
WO2001050647A1 (fr) 2001-07-12
AU7820400A (en) 2001-07-16
AU1566401A (en) 2001-07-16
EP1247363A1 (fr) 2002-10-09
EP1245089A1 (fr) 2002-10-02

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