WO2005117275A1 - 受信装置 - Google Patents
受信装置 Download PDFInfo
- Publication number
- WO2005117275A1 WO2005117275A1 PCT/JP2005/009094 JP2005009094W WO2005117275A1 WO 2005117275 A1 WO2005117275 A1 WO 2005117275A1 JP 2005009094 W JP2005009094 W JP 2005009094W WO 2005117275 A1 WO2005117275 A1 WO 2005117275A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- initial synchronization
- synchronization
- channel decoder
- channel
- signal
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2681—Details of algorithms characterised by constraints
- H04L27/2685—Speed of convergence
Definitions
- the present invention relates to a receiving device, a receiving method, a receiving program, and a recording medium for receiving, for example, a digital radio broadcast, a digital television broadcast, and the like.
- OFDM Orthogonal Frequency Division Multiplexing
- a modulated signal of each channel is generated by tuned reception and selective reception of an incoming radio wave, and synchronization detection and demodulation are performed to separate information, thereby obtaining a channel.
- the service information is reproduced every time.
- a broadcast signal reception processing device disclosed in Japanese Patent Application Laid-Open No. 2002-94401 for receiving digital radio broadcasts by a DAB (Digital Audio Broadcasting) system, which has been put to practical use in the European region, uses an incoming radio wave.
- a modulated signal of each channel called an ensemble is generated, and information is separated by performing synchronization detection and demodulation, etc., so that the weather forecast, traffic information, etc. Service information is reproduced for each channel.
- the broadcast signal reception processing device when the ensemble being received cannot be received while moving with a moving object such as an automobile, the broadcast signal reception processing device corresponds to the service information included in the ensemble being received. Automatically seeks to search for an ensemble of another channel that has service information, and switches to select and receive the other searched ensemble, so that the same content of service information is reproduced seamlessly. thing Is possible.
- Patent Document 1 JP-A-2002-94401
- the present invention has been made in view of such a conventional problem. For example, when a channel being received becomes unreceivable and a new initial synchronization needs to be performed, the initial synchronization is performed. It is an object of the present invention to provide a receiving apparatus capable of shortening the time required for performing the above.
- a receiving device receives a digital broadcast, and outputs a modulated signal of at least two channels included in the digital broadcast, and a signal output from the receiving device.
- First channel decoder means for obtaining an initial synchronization for one of the modulated signals and decoding the same, and a second channel decoder for obtaining an initial synchronization and decoding for another of the modulated signals
- the first and second channel decoders share a synchronization result obtained by performing the initial synchronization with each other.
- a receiving method is a receiving step of receiving a digital broadcast and outputting modulated signals of at least two channels included in the digital broadcast; A first channel decoder step of decoding one modulated signal with initial synchronization, and initializing the other modulated signals of the modulated signals. And a second channel decoder step of decoding in a timely manner, wherein the first and second channel decoder steps share the synchronization result obtained by the initial synchronization with each other.
- the invention according to claim 3 includes a receiving unit that receives a digital broadcast and outputs a modulated signal of at least two channels included in the digital broadcast, and performs a computer process on the modulated signal.
- a program for a receiving device comprising: a first channel decoder step of performing initial synchronization for one of the modulated signals output from the receiving means and decoding the modulated signal; A second channel decoder step of decoding the signal by taking an initial synchronization, wherein the first and second channel decoder steps share a synchronization detection result of the initial synchronization with each other. I do.
- the invention according to claim 4 is an information recording / reproducing medium, wherein the program described in claim 4 is recorded.
- FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving device according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to a more specific embodiment.
- FIG. 3 is a flowchart for explaining an operation of the digital broadcast receiving apparatus shown in FIG. 2.
- FIG. 1A is a block diagram illustrating a configuration of a receiving apparatus according to the present embodiment
- FIG. 1B is a diagram schematically illustrating a configuration of a broadcast signal modulated by an OFDM modulation scheme.
- this receiving device includes a front-end unit 3 as a receiving unit to which a receiving antenna 2 for receiving broadcast radio waves is connected, and an AZD conversion unit. It comprises units 4a and 4b, channel decoders 5a and 5b, a source decoder 6, and a controller 7.
- the front-end unit 3 generates a multi-channel modulated signal frequency-converted to an intermediate frequency by tuned reception of the received signal Sin generated in the receiving antenna 2, and further selects a multi-channel modulated signal. Upon reception, a modulated signal of each channel consisting of the intermediate frequency is output.
- front end section 3 performs tuning reception based on the local oscillation frequency specified by reception control signal CH supplied from control section 7, and is further specified by reception control signal CH. Selectively receive and output the modulated signal of the channel. Then, for example, when different channels chl and ch2 are designated as the channels to be selectively received, as illustrated in FIG. 10A, the modulation signal Schl of the channel chl and the modulation signal Sch2 of the channel ch2 are specified. Is selected, and when another channel is specified, the modulation signal of the specified channel is selected and output.
- the AZD conversion units 4a and 4b perform AZD conversion of the modulation signals Schl and Sch2 of different channels output from the front end unit 3 into modulation signals Dchl and Dch2 composed of digital data strings, and the channel decoder units 5a and 5b To supply.
- the channel decoder units 5a and 5b obtain initial synchronization (so-called frame synchronization) with the synchronization symbols included in the modulation signals Dchl and Dch2, and then perform a service identification symbol subsequent to the synchronization symbols. By demodulating information transmission symbols, etc., it generates and outputs demodulated demodulated signals Dwl and Dw2.
- each of the modulation signals Schl to Schn of the plurality of channels chl to chn transmitted from the broadcasting station has one transmission frame as a synchronization symbol.
- a symbol for service identification and a symbol for information transmission following the symbol, and a synchronization symbol for each of the modulation signals Schl to Schn is transmitted from the broadcasting station in synchronization.
- the channel decoder unit 5a performs initial synchronization with the synchronization symbol included in the modulation signal Dchl, and then demodulates the service identification symbol and the information transmission symbol, thereby performing demodulation signal Dwl.
- the channel decoder unit 5b synchronizes with the synchronization symbol included in the modulation signal D ch2 and performs initial synchronization, the service identification symbol And demodulates the information transmission symbol to output a demodulated signal Dw2.
- the channel decoder section 5a when the channel decoder section 5a takes initial synchronization, it generates a synchronization signal LKa as a synchronization detection result and supplies it to the channel decoder section 5b. Similarly, the channel decoder section 5b also takes initial synchronization. And a synchronization signal LKb is generated and supplied to the channel decoder unit 5a. If one of the channel decoders 5a and 5b cannot take initial synchronization based on the demodulated signals supplied from the AZD converters 4a and 4b, and if a situation arises, The channel decoder unit determines that it has achieved initial synchronization by itself based on the supplied synchronization signal, and promptly starts the decoding process for demodulating the service identification symbol and the information transmission symbol.
- the reception quality of the demodulated signal Dwl of the channel chl is degraded by the influence of multipath fading or the like, and the channel decoder unit 5a needs to newly obtain initial synchronization with the demodulated signal Dwl.
- the channel decoder unit 5b if the channel decoder unit 5b has already obtained the initial synchronization with the demodulated signal D w2, the channel decoder unit 5a receives the synchronization signal LKb supplied from the channel decoder unit 5b, and Complete the initial synchronization assuming that the initial synchronization has been performed for Dwl.
- the initial synchronization required for Ji Yang channel decoder 5b is newly demodulated signal Dw2 If the channel decoder 5a has already been synchronized with the demodulated signal Dwl in the event of occurrence of the delay, the channel decoder 5b inputs the synchronous signal LKa supplied from the channel decoder 5a to The initial synchronization is completed assuming that the initial synchronization has been performed for Dw2.
- the channel decoder units 5a and 5b share the synchronization signals LKa and LKb with each other to perform the initial synchronization, so that both can quickly complete the initial synchronization.
- the source decoder 6 decodes the demodulated signals Dwl and Dw2, which have been subjected to the encoding and compression processing, and returns them as so-called data-decompressed audio signals, image signals, various data, and the like, and outputs them.
- the control unit 7 is formed of a microprocessor (MPU) or the like that executes a predetermined system program, and when a desired broadcast station and channel are specified, the reception control signal CH is transmitted to the front end unit. 3 and other control signals CNTa, CNTb, CNTs Thus, the operation of the channel decoder sections 5a and 5b and the source decoder 6 is controlled.
- MPU microprocessor
- the channel decoders 5a and 5b share the synchronization signals LKa and LKb with each other, one channel decoder is used.
- the initial synchronization can be obtained based on the initial synchronization signal supplied from the other channel decoder. The time required for synchronization can be reduced.
- the modulation signal for two channels is output from the tuner unit 3 and decoding processing such as demodulation is performed by the two channel decoder units 5a and 5b. It is not done.
- a modulated signal of three or more channels is output from the tuner unit 3
- a decoding process such as demodulation is performed by three or more channel decoder units
- a synchronization signal is output when each of the channel decoder units takes initial synchronization.
- the respective synchronization signals may be shared and used.
- the plurality of channel decoder units 5a, 5b, etc., and the source decoder 6 are formed by a microprocessor (MPU), and arithmetic processing functions such as a digital signal signal processor (DSP).
- MPU microprocessor
- DSP digital signal signal processor
- the functions of the channel decoder units 5a and 5b and the like and the source decoder 6 described above may be exhibited by forming a predetermined system program (computer program) by using an integrated circuit device or the like having the above.
- the receiving device 1 of the present embodiment information for reading and reproducing recorded information recorded on a storage medium (information recording / reproducing medium) such as a CD (Compact Dies), a DVD (Digital Versatile Disc), or a semiconductor memory.
- a storage medium such as a CD (Compact Dies), a DVD (Digital Versatile Disc), or a semiconductor memory.
- a reproducing device is provided, and an information recording / reproducing medium on which a computer program having the functions of the above-described channel decoder units 5a and 5b, the source decoder 6 and the control unit 7 is recorded is reproduced by the information reproducing device, and It may be installed in a microprocessor or digital signal processor (DSP) or the like and executed.
- DSP digital signal processor
- FIG. 2 is a block diagram showing the configuration of the receiving apparatus according to the present embodiment, and is the same as or equivalent to FIG. 1 (a). Are denoted by the same reference numerals.
- FIG. 3 is a flowchart for explaining the operation of the receiving apparatus of the present embodiment.
- this receiving device (digital broadcast receiving device) 1 includes a receiving antenna 2 for receiving an incoming digital radio broadcast broadcast wave, similarly to the digital broadcast receiving device shown in FIG. AZD converters 4a and 4b, channel decoders 5a and 5b, a source decoder 6, and a controller 7, and further connected to the output of the source decoder 6. It has a DZA transformer 8, a drive unit 9, and a speaker.
- the front end unit 3 performs tuning reception of the reception signal Sin generated in the reception antenna 2 based on the local oscillation frequency specified by the reception control signal CH supplied from the control unit 7, and further performs reception.
- Control signal Selectively receives and outputs the modulation signal of the channel specified by CH. For example, when different channels chl and ch2 are specified as the channels to be selectively received, the modulation signal Schl of the channel chl and the modulation signal Sch2 of the channel ch2 are selected and output, and the AZD converters 4a and 4b output.
- the modulated signals Schl and Sch2 are AZD-converted into modulated signals Dchl and Dch2 composed of digital data strings and supplied to the channel decoder units 5a and 5b.
- the channel decoder units 5a and 5b perform initial synchronization (so-called frame synchronization) with the synchronization symbols included in the modulation signals Dchl and Dch2, and then perform a service identification symbol subsequent to the synchronization symbols. By demodulating information transmission symbols, etc., it generates and outputs demodulated demodulated signals Dwl and Dw2.
- each of the modulation signals Schl to Schn of the plurality of channels chl to chn transmitted from the radio broadcast station has one transmission frame for synchronization. It is configured to have a symbol, a service identification symbol following it, and an information transmission symbol, and further transmits a broadcasting station power by synchronizing the synchronization symbols of the modulated signals Schl to Schn.
- the channel decoder unit 5a performs initial synchronization with the synchronization symbol included in the modulated signal Dchl, and then demodulates the service identification symbol and the information transmission symbol, thereby performing demodulation signal Dwl.
- the channel decoder unit 5b synchronizes with the synchronization symbol included in the modulation signal D ch2 and performs initial synchronization, the service identification symbol And demodulates the information transmission symbol to output a demodulated signal Dw2.
- the channel decoder unit 5a generates a synchronization signal LKa when the initial synchronization is obtained, and supplies the synchronization signal LKa to the channel decoder unit 5b.
- the channel decoder unit 5b generates the synchronization signal LKb when the initial synchronization is obtained. And supplies it to the channel decoder section 5a. If one of the channel decoder units 5a and 5b cannot perform initial synchronization based on the demodulated signal supplied from the AZD conversion units 4a and 4b, the other channel decoder unit Based on the supplied synchronization signal, it is assumed that initial synchronization has been taken by itself, and the decoding process for demodulating the service identification symbol and the information transmission symbol is started promptly.
- the channel decoder units 5a and 5b share the synchronization signals LKa and LKa with each other to perform the initial synchronization, so that both can quickly complete the initial synchronization.
- the source decoder 6 decodes the demodulated signals Dwl and Dw2, which have been subjected to the encoding and compression processing, and returns the so-called data-decompressed audio signal Dau to output. Then, the audio signal Dau is converted into an analog audio signal Sau by the DZA translator 8, and the drive unit 9 amplifies the power and supplies it to the speaker 10, so that the broadcasting station power is transmitted, for example, music or the like. Output.
- the control unit 7 is formed of a microprocessor (MPU) or the like that executes a predetermined system program. When a desired broadcast station and channel are specified, the reception control signal CH is transmitted to the front end unit. In addition to supplying to the channel decoder 3, the operation of the channel decoder units 5a and 5b and the source decoder 6 is controlled by various control signals CNTa, CNTb and CNTs.
- MPU microprocessor
- the control unit 7 supplies a reception control signal CH indicating the designated broadcast station and channel to the front end unit 3 to perform tuning reception and selective reception.
- the front end unit 3 performs tuning reception and selective reception.
- the specified channel is the channel chl
- the modulation signal Schl of the channel chl is output to the AZD converter 4a, and the specified signal is output.
- Channel other than channel chl for example, channel The modulation signal Sch2 of channel ch2 is output to the AZD converter.
- AZD converters 4a and 5a perform AZD conversion of modulation signals Schl and Sch2 into modulation signals Dchl and Dch2 formed of digital data strings, respectively, and supply them to channel decoder sections 5a and 5b.
- the demodulated signals Swl and Sw2 are generated by demodulating the respective modulated signals Dchl and Dch2 by the channel decoder units 5a and 5b, and supplied to the source decoder unit 6, and the source decoder unit 6
- the audio signals such as the music transmitted by the respective channels chl and ch2 are reproduced, and the audio signal Dau for the designated channel c hi is output.
- the audio signal Dau is converted into an analog audio signal Sau by the DZA converter 8, and power is amplified by the driving unit 9 and supplied to the speaker 10, thereby reproducing music and the like.
- the reception quality of the demodulated signal Dwl of the channel chl is degraded due to the influence of multipath fading or the like, and it becomes necessary for the channel decoder unit 5a to newly perform initial synchronization with the demodulated signal Dwl.
- processing for initial synchronization is performed according to the flowchart shown in FIG.
- step ST1 the timing information and the like of the initial synchronization set previously have been obtained.
- step ST2 a process for obtaining initial synchronization is performed on the demodulated signal Dwl of the channel chl.
- step ST3 After generating the synchronization signal LKa and supplying it to the channel decoder unit 5a, the process proceeds to step ST4 to perform processing such as demodulation processing on the modulation signal Dchl to generate the demodulation signal Swl. It generates and decodes the demodulated signal Swl to return it to the audio signal Dau of music and the like transmitted by the channel chl and outputs it.
- step ST2 as a result of performing a correlation operation with the synchronization symbol included in demodulated signal Dwl, if the correlation value is smaller than a predetermined threshold, the process proceeds to step ST5. To do. Then, in step ST5, it is determined whether or not the synchronization signal LKb has already been output from the channel decoder unit 5b, and if the synchronization signal LKb has already been output, the synchronization signal LKb is input to perform the initial synchronization processing. Upon completion, the process proceeds to Step ST4.
- a demodulation signal Swl is generated by performing processing such as demodulation processing on the modulation signal Dchl, and further, by decoding the demodulation signal Swl, music transmitted by the channel chl is performed.
- step ST5 if the synchronization signal LKb is not output from the channel decoder unit 5b in step ST5, the process returns to step ST2 to repeat the processing. Then, when the channel decoder unit 5a obtains the initial synchronization by itself, it completes the initial synchronization in steps ST2 and ST3, starts the process of step ST4, and the channel decoder unit 5b obtains the initial synchronization. In this case, the channel decoder unit 5a completes the initial synchronization in steps ST2 and ST5, and starts the processing in step ST4.
- the channel decoder units 5a and 5b share the synchronization signals LKa and LKb with each other.
- the initial synchronization can be performed based on the initial synchronization signal supplied from the other channel decoder. It is possible to reduce the time required for the initial synchronization.
- the digital broadcast receiving apparatus 1 of the present embodiment is mounted on a mobile object such as a car, for example, when a new initial synchronization needs to be obtained due to the influence of multipath fading or the like, the initial synchronization is quickly performed. Therefore, it is suitable for use as a so-called digital monophonic transmission / reception device.
- the channel decoder units 5a and 5b and the source decoder 6 are formed by so-called hardware.
- the channel decoder units 5a and 5b and the source decoder 6 are connected to a microprocessor ( (MPU) and digital signal processor (DSP), etc., which are formed by an integrated circuit device having an arithmetic processing function and execute a predetermined system program (computer program) to execute the above-described channel.
- MPU microprocessor
- DSP digital signal processor
- the functions of the source decoder 6 and the source decoders 5a and 5b may be performed.
- the receiving apparatus 1 of the present embodiment is provided with an information reproducing apparatus for reading and reproducing recorded information recorded on a storage medium (information recording / reproducing medium) such as a CD, DVD, or semiconductor memory.
- the information recording / reproducing medium on which the computer programs having the functions of the channel decoder sections 5a, 5b, etc., the source decoder 6 and the control section 7 are recorded is reproduced by the information reproducing apparatus, and the above-described microprocessor or digital signal signal processor is reproduced. It may be installed and run on a DSP (DSP).
- DSP digital signal signal processor
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/597,186 US20070217547A1 (en) | 2004-05-26 | 2005-05-18 | Receiver |
EP05741412A EP1750374A1 (en) | 2004-05-26 | 2005-05-18 | Reception device |
JP2006513853A JPWO2005117275A1 (ja) | 2004-05-26 | 2005-05-18 | 受信装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-156020 | 2004-05-26 | ||
JP2004156020 | 2004-05-26 |
Publications (1)
Publication Number | Publication Date |
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WO2005117275A1 true WO2005117275A1 (ja) | 2005-12-08 |
Family
ID=35451216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/009094 WO2005117275A1 (ja) | 2004-05-26 | 2005-05-18 | 受信装置 |
Country Status (4)
Country | Link |
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US (1) | US20070217547A1 (ja) |
EP (1) | EP1750374A1 (ja) |
JP (1) | JPWO2005117275A1 (ja) |
WO (1) | WO2005117275A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2132912B1 (en) * | 2007-03-15 | 2016-04-06 | Nokia Technologies Oy | Digital broadcast service discovery correlation |
US7796706B2 (en) | 2007-03-15 | 2010-09-14 | Nokia Corporation | Digital broadcast service discovery correlation |
US7787548B2 (en) | 2007-03-15 | 2010-08-31 | Nokia Corporation | Digital broadcast service discovery correlation |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11261521A (ja) * | 1998-03-06 | 1999-09-24 | Kenwood Corp | ディジタル放送用受信機 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5943371A (en) * | 1997-03-24 | 1999-08-24 | Delco Electronics Corporation | Memory efficient time de-interleave, de-puncture and viterbi decoder circuitry |
JPH10313286A (ja) * | 1997-05-13 | 1998-11-24 | Sony Corp | 受信装置 |
KR100287728B1 (ko) * | 1998-01-17 | 2001-04-16 | 구자홍 | 영상프레임동기화장치및그방법 |
JP3422686B2 (ja) * | 1998-06-12 | 2003-06-30 | 三菱電機株式会社 | データ復号装置及びデータ復号方法 |
-
2005
- 2005-05-18 EP EP05741412A patent/EP1750374A1/en not_active Withdrawn
- 2005-05-18 WO PCT/JP2005/009094 patent/WO2005117275A1/ja not_active Application Discontinuation
- 2005-05-18 JP JP2006513853A patent/JPWO2005117275A1/ja active Pending
- 2005-05-18 US US11/597,186 patent/US20070217547A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11261521A (ja) * | 1998-03-06 | 1999-09-24 | Kenwood Corp | ディジタル放送用受信機 |
Also Published As
Publication number | Publication date |
---|---|
US20070217547A1 (en) | 2007-09-20 |
EP1750374A1 (en) | 2007-02-07 |
JPWO2005117275A1 (ja) | 2008-04-03 |
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