CN114928421A - CDR low-rate data transmission system and transmission method - Google Patents
CDR low-rate data transmission system and transmission method Download PDFInfo
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- CN114928421A CN114928421A CN202210443181.XA CN202210443181A CN114928421A CN 114928421 A CN114928421 A CN 114928421A CN 202210443181 A CN202210443181 A CN 202210443181A CN 114928421 A CN114928421 A CN 114928421A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/80—Responding to QoS
Abstract
The invention provides a CDR low-rate data transmission system and a transmission method, which comprises the steps of obtaining accurate timing information on a broadcasting server through configuring hardware and compiling software, generating low-rate data packets in a timed and quantitative mode and outputting the low-rate data packets to broadcasting equipment. The invention carries out comprehensive system design at the sending end and the receiving end of the broadcasting system of the broadcasting station, can reduce the data transmission rate of the CDR data service, enhance the rate stability and meet the requirement that a plurality of data services are transmitted simultaneously in the limited CDR channel capacity.
Description
Technical Field
The invention belongs to the technical field of communication, relates to a system and a method for digitally broadcasting and receiving a frequency modulation frequency band of a broadcasting station, and particularly relates to a CDR low-rate data transmission system and a transmission method.
Background
At present, CDR digital audio broadcasting is performed in a frequency modulation band, and the service form generally adopted is as follows: 1. transmitting digital audio, receiving with a dedicated CDR radio, 2, transmitting EPG/ESG information, receiving with a dedicated receiver having a display. The former can only broadcast audio services, and the latter can only broadcast program lists and pictures. Particularly, when data is transmitted on a CDR digital audio broadcasting channel, the control of the data transmission rate is not flexible, an excessive bandwidth is occupied, the data transmission has no time reference, time errors are accumulated due to long-term operation, and the conditions of rate instability and jitter occur. When transmitting services with little data quantity, such as emergency information, meteorological information, traffic information, control signals and the like, the services have low requirements on data rate and bandwidth, if the services occupy high bandwidth, the frequency spectrum resources are wasted, and the number of the receivable services is reduced.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a CDR low-rate data transmission system and transmission method, which are used to solve the problems in the prior art that it is difficult to transmit multiple data services simultaneously on a CDR channel, reduce the data rate, and enhance the stability of data transmission.
To achieve the above and other related objects, the present invention provides a CDR low-rate data transmission system, comprising a broadcasting section for outputting a constant-rate low-rate data stream and transmitting the constant-rate low-rate data stream to a broadcasting station multiplexer and a broadcasting facility; and the receiving part is used for extracting data service from all data loaded in the CDR channel and sending the extracted low-rate data stream to the service function module.
Preferably, the play-out part comprises a precision time source, a timer, a data input interface and a packer, wherein the timer can receive time information from the precision time source;
preferably, the data input interface receives external service data, the divider is connected to the data input interface, the divider divides the service data into byte segments with specified byte number, the packer packs the byte segments and transmits the packed byte segments according to the time information received by the timer, the packer is connected to a data output interface, and the data output interface is used for outputting the low-rate data stream with constant rate and transmitting the low-rate data stream to a multiplexer and a broadcasting facility of a broadcasting station.
Preferably, the receiving part includes a CDR receiving module, a demultiplexing module, a checking module, and a service function module, where the CDR receiving module is connected to the demultiplexing module, and the CDR receiving module is configured to receive a radio broadcast signal.
Preferably, the demultiplexing module is configured to perform data service extraction on a data stream to obtain a data stream that is the same as the low-rate data stream with a constant rate at the playing part; the check module is used for checking and correcting the data stream extracted by the demultiplexing module; and the service function module completes the established function according to the service type after obtaining the data stream output by the verification module.
Preferably, the precise time source may be a satellite timer, a network precise time service, and a server self-timing, and when the precise time source is the server self-timing, the server self-timing may obtain a feedback signal from a multiplexer and a broadcasting facility of the broadcasting station for correcting a clock of the server.
The invention also provides a transmission method of the CDR low-speed data transmission system, which comprises the following steps:
s1, configuring the precise time source on a CDR broadcasting server of a broadcasting station;
s2, receiving the time information of the precise time source through the timer, thereby obtaining a precise timing period;
and S3, receiving external service data through the data input interface according to a precise timing period, dividing the service data to be played into byte segments with specified byte number through the divider, packaging the byte segments through the packer, outputting a low-rate data stream with constant rate at the data output interface of the server according to a timing time interval given by the timer, and uniformly sending the low-rate data stream to the multiplexer and the playing facility of the broadcasting station.
S4, obtaining all data loaded in the CDR channel through the CDR receiving module, extracting data service from the data stream received by the CDR receiving module by the demultiplexing module, and analyzing the appointed low-rate data stream;
and S5, the data flow extracted and analyzed by the demultiplexing module is checked and corrected in the checking module, correct data is output to the service function module, and the service function module decodes the data into various data service forms according to service types to complete the established functions.
As described above, the CDR low-rate data transmission system and transmission method according to the present invention have the following advantages:
(1) the invention can reduce the data transmission rate of CDR data service, enhance the stability of the rate and meet the requirement that a plurality of data services are transmitted simultaneously in the limited CDR channel capacity by carrying out comprehensive system design at the transmitting end and the receiving terminal of the broadcasting system of the broadcasting station;
(2) the invention can broadcast various appointed data services at a very low speed on a broadcasting station, uses a special receiver for receiving and decoding to obtain data with the same broadcasting content as the broadcasting station. This method enables the transmission of a plurality of low rate data services within the limited channel capacity of the CDR, particularly 3-10 low rate data services within a bandwidth that can typically accommodate only one digital audio for emergency, traffic, weather, control, etc. services that inherently have a low data volume. The operation mode of the CDR digital audio broadcasting data service is greatly expanded.
Drawings
Fig. 1 is a block diagram of an implementation of the playout portion of the present invention.
Fig. 2 is a software flow diagram of the play-out portion of the present invention.
Fig. 3 is a block diagram of an implementation of the receive part of the present invention.
Fig. 4 is a block diagram of implementing a play-out section according to a second embodiment of the present invention.
Fig. 5 is a block diagram of a third playing-out part according to an embodiment of the present invention.
Fig. 6 is a block diagram of a fourth play-out part according to an embodiment of the present invention.
The numbering in the figures illustrates: 1. a precision time source; 2. a timer; 3. a data input interface; 4. a divider; 5. a packer; 6. a data output interface; 7. a CDR receiving module; 8. a demultiplexing module; 9. a checking module; 10. a service function module; 11. a satellite time service device; 12. network precision time service; 13. the server is self-timed.
Detailed Description
Please refer to the attached drawings. It should be noted that the drawings provided in the present embodiment are only for schematically illustrating the basic idea of the invention, and the drawings only show the components related to the invention rather than the number of components in actual implementation, and the type and the number of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
The present invention will be described in detail below with reference to examples and the accompanying drawings.
The first embodiment is as follows: the invention provides a CDR low-rate data transmission system and a transmission method,
as shown in fig. 1-3, a CDR low-rate data transmission system is divided into a broadcasting part and a receiving part, the broadcasting part is used for outputting a constant-rate low-rate data stream and sending the constant-rate low-rate data stream to a broadcasting station multiplexer and a broadcasting facility; and the receiving part is used for extracting data service from all data loaded in the CDR channel and sending the extracted low-rate data stream to the service function module.
As shown in fig. 1, the play-out section includes a precision time source 1, a timer 2, a data input interface 3, a divider 4, and a packer 5, where the timer 2 is used to receive time information from the precision time source 1 and provide precise timing for other software modules running in the server. The data input interface 3 receives external service data, the divider 4 is connected with the data input interface 3, and the divider 4 divides the input service data to be played into short byte segments with specified byte number. The packer 5 packs the data segments, transmits the data segments according to the timing time interval given by the timer 2, and finally outputs a low-rate data stream with constant rate at the data output interface 6 of the server. This data stream is sent to the broadcaster's existing multiplexer and playout facilities.
As shown in fig. 3, the receiving part includes a CDR receiving module 7, a demultiplexing module 8, a checking module 9, and a service function module 10, where the CDR receiving module 7 is connected to the demultiplexing module 8, the CDR receiving module 7 is configured to receive a radio broadcast signal to obtain all data carried in a CDR channel, the demultiplexing module 8 performs data service extraction on a data stream to obtain a data stream of the same data service as the broadcasting part, performs checking and error correction in the checking module 9, outputs correct data to the service function module 10, and the service function module 10 performs presentation and action according to a service type to complete a predetermined function.
The invention also provides a transmission method of the CDR low-speed data transmission system, which comprises the following steps:
s1, configuring the precise time source on a CDR broadcasting server of a broadcasting station;
s2, receiving the time information of the precise time source through the timer, thereby obtaining a precise timing period;
and S3, receiving external service data through the data input interface according to a precise timing cycle, dividing the service data to be played into byte segments with specified byte number through the divider, packaging the byte segments through the packer, outputting a low-speed data stream with constant speed at the data output interface of the server according to the timing time interval given by the timer, and uniformly transmitting the low-speed data stream to the multiplexer and the playing facility of the broadcasting station.
S4, obtaining all data loaded in the CDR channel through the CDR receiving module, extracting data service from the data stream received by the CDR receiving module by the demultiplexing module, and analyzing the appointed low-rate data stream;
and S5, the data stream extracted and analyzed by the demultiplexing module is checked and corrected in the checking module, correct data is output to the service function module, and the service function module decodes the data into various data service forms according to service types to complete established functions.
The second embodiment: as shown in fig. 4, a CDR low-rate data transmission system is divided into two parts, namely, a broadcasting part and a receiving part, wherein the broadcasting part includes a satellite timer 11, a timer 2, a data input interface 3, a divider 4 and a packer 5, the timer 2 is used for receiving time information from the satellite timer 11, and the satellite timer 11 is configured on a server to obtain a precise timing period. Providing precise timing to other software modules running in the server. The data input interface 3 receives external service data, the divider 4 is connected with the data input interface 3, and the divider 4 divides the input service data to be played into short byte segments with specified byte number. The packer 5 packs the data segments, transmits the data segments according to the timing time interval given by the timer 2, and finally outputs a low-rate data stream with constant rate at the data output interface 6 of the server. This data stream is sent to the broadcaster's existing multiplexer and playout facilities.
As shown in fig. 3, the receiving part includes a CDR receiving module 7, a demultiplexing module 8, a checking module 9, and a service function module 10, where the CDR receiving module 7 is connected to the demultiplexing module 8, the CDR receiving module 7 is configured to receive a radio broadcast signal to obtain all data carried in a CDR channel, the demultiplexing module 8 performs data service extraction on a data stream to obtain a data stream of the same data service as the broadcasting part, performs checking and error correction in the checking module 9, outputs correct data to the service function module 10, and the service function module 10 performs presentation and action according to a service type to complete a predetermined function.
Example three: as shown in fig. 5, a CDR low-rate data transmission system is divided into two parts, namely, a broadcasting part and a receiving part, where the broadcasting part includes a network precision time service 12, a timer 2, a data input interface 3, a divider 4, and a packer 5, the timer 2 is used to receive time information from the network precision time service 12, a network precision time protocol network card and software are configured on the server, and a precision timing period is obtained by using the network precision time protocol. Providing accurate timing to other software modules running in the server. The data input interface 3 receives external service data, the divider 4 is connected with the data input interface 3, and the divider 4 divides the input service data to be played into short byte segments with specified byte number. The packer 5 packs the data segments, transmits the data segments according to the timing time interval given by the timer 2, and finally outputs a low-rate data stream with constant rate at the data output interface 6 of the server. This data stream is sent to the broadcaster's existing multiplexer and playout facilities.
As shown in fig. 3, the receiving part includes a CDR receiving module 7, a demultiplexing module 8, a checking module 9, and a service function module 10, where the CDR receiving module 7 is connected to the demultiplexing module 8, the CDR receiving module 7 is configured to receive a radio broadcast signal to obtain all data carried in a CDR channel, the demultiplexing module 8 performs data service extraction on a data stream to obtain a data stream of the same data service as the broadcasting part, performs checking and error correction in the checking module 9, outputs correct data to the service function module 10, and the service function module 10 performs presentation and action according to a service type to complete a predetermined function.
Example four: as shown in fig. 6, a CDR low-rate data transmission system is divided into two parts of play-out and reception, the play-out part includes a server self-timing 13, a timer 2, a data input interface 3, a slicer 4, and a packer 5, and the timer 2 is used for receiving time information from the server self-timing 13. Providing accurate timing to other software modules running in the server. The data input interface 3 receives external service data, the divider 4 is connected with the data input interface 3, and the divider 4 divides the input service data to be played into short byte segments with specified byte number. The packer 5 packs the data segments, transmits the data segments according to the timing time interval given by the timer 2, and finally outputs a low-rate data stream with constant rate at the data output interface 6 of the server. This data stream is sent to the broadcaster's existing multiplexer and broadcast facility, and in order to allow a stable and uniform broadcast of the data at a very low rate, in this embodiment a feedback signal is obtained from the broadcaster's other equipment to correct the clock of the server.
As shown in fig. 3, the receiving part includes a CDR receiving module 7, a demultiplexing module 8, a checking module 9, and a service function module 10, where the CDR receiving module 7 is connected to the demultiplexing module 8, the CDR receiving module 7 is configured to receive a radio broadcast signal to obtain all data carried in a CDR channel, the demultiplexing module 8 performs data service extraction on a data stream to obtain a data stream of the same data service as the broadcasting part, checks and corrects errors in the checking module 9, and outputs correct data to the service function module 10, and the service function module 10 performs presentation and action according to a service type to complete a predetermined function.
Claims (9)
1. A CDR low rate data transmission system comprising:
the broadcasting part is used for outputting a low-rate data stream with constant rate and sending the low-rate data stream with constant rate to a broadcasting station multiplexer and a broadcasting facility;
and the receiving part is used for extracting data service from all data loaded in the CDR channel and sending the extracted low-rate data stream to the service function module.
2. The CDR low rate data transmission system of claim 1, wherein: the play-out part comprises a precision time source, a timer, a data input interface and a packer, wherein the timer can receive time information from the precision time source.
3. A CDR low rate data transmission system according to claim 2, characterized by: the data input interface receives external service data, the divider is connected with the data input interface, the divider divides the service data into byte segments with specified byte number, the packer packs the byte segments and transmits the packed byte segments according to the time information received by the timer, the packer is connected with a data output interface, and the data output interface is used for outputting the low-rate data stream with constant rate and transmitting the low-rate data stream to a multiplexer and a broadcasting facility of a broadcasting station.
4. The CDR low rate data transmission system of claim 1, wherein: the receiving part comprises a CDR receiving module, a demultiplexing module, a checking module and a service function module, wherein the CDR receiving module is connected with the demultiplexing module and is used for receiving radio broadcasting signals.
5. The CDR low rate data transmission system of claim 4, wherein: the demultiplexing module is used for extracting data services from the data stream to obtain the data stream which is the same as the low-rate data stream with constant rate of the broadcasting part;
the check module is used for checking and correcting the data stream extracted by the demultiplexing module;
and the service function module completes the established function according to the service type after obtaining the data stream output by the verification module.
6. A CDR low rate data transmission system according to claim 3, characterized by: the precise time source is a satellite timer.
7. A CDR low rate data transmission system according to claim 3, characterized by: and the precise time source is network precise time service.
8. A CDR low rate data transmission system according to claim 3, characterized by: the precise time source is a server self-timing which can obtain a feedback signal from a multiplexer and a broadcasting facility of the broadcasting station for correcting a clock of the server.
9. The transmission method of a CDR low rate data transmission system according to any of claims 1 to 8, comprising the steps of:
s1, configuring the precise time source on a CDR broadcasting server of a broadcasting station;
s2, receiving the time information of the precise time source through the timer, thereby obtaining a precise timing period;
and S3, receiving external service data through the data input interface according to a precise timing period, dividing the service data to be played into byte segments with specified byte number through the divider, packaging the byte segments through the packer, outputting a low-rate data stream with constant rate at the data output interface of the server according to a timing time interval given by the timer, and uniformly sending the low-rate data stream to the multiplexer and the playing facility of the broadcasting station.
S4, obtaining all data loaded in the CDR channel through the CDR receiving module, extracting data service from the data stream received by the CDR receiving module by the demultiplexing module, and analyzing the appointed low-rate data stream;
and S5, the data flow extracted and analyzed by the demultiplexing module is checked and corrected in the checking module, correct data is output to the service function module, and the service function module decodes the data into various data service forms according to service types to complete the established functions.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020066260A (en) * | 2001-02-09 | 2002-08-14 | 한국전자통신연구원 | The data streaming apparatus and method for digital databroadcasting service |
| JP2005057733A (en) * | 2003-07-18 | 2005-03-03 | Canon Inc | Digital data transmission apparatus, digital data reception apparatus, digital broadcast receiving apparatus, digital data transmission method, digital data reception method, digital broadcast receiving method, computer program and computer- readable recording medium |
| CN101102235A (en) * | 2007-07-26 | 2008-01-09 | 北京交通大学 | A method and device for measuring switching time |
| US20100021173A1 (en) * | 2007-04-06 | 2010-01-28 | Huawei Technologies Co., Ltd. | Method and apparatus for multiplexing and demultiplexing low bit rate services |
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- 2022-04-26 CN CN202210443181.XA patent/CN114928421A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020066260A (en) * | 2001-02-09 | 2002-08-14 | 한국전자통신연구원 | The data streaming apparatus and method for digital databroadcasting service |
| JP2005057733A (en) * | 2003-07-18 | 2005-03-03 | Canon Inc | Digital data transmission apparatus, digital data reception apparatus, digital broadcast receiving apparatus, digital data transmission method, digital data reception method, digital broadcast receiving method, computer program and computer- readable recording medium |
| US20100021173A1 (en) * | 2007-04-06 | 2010-01-28 | Huawei Technologies Co., Ltd. | Method and apparatus for multiplexing and demultiplexing low bit rate services |
| CN101102235A (en) * | 2007-07-26 | 2008-01-09 | 北京交通大学 | A method and device for measuring switching time |
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