CN109218760B - Method and device for modulating large-code-rate program - Google Patents
Method and device for modulating large-code-rate program Download PDFInfo
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- CN109218760B CN109218760B CN201811220406.5A CN201811220406A CN109218760B CN 109218760 B CN109218760 B CN 109218760B CN 201811220406 A CN201811220406 A CN 201811220406A CN 109218760 B CN109218760 B CN 109218760B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
Abstract
The invention discloses a method for modulating a program with a large code rate, which comprises the following steps: dividing a single program TS stream or a multi-program TS stream into a plurality of data streams according to a certain rule, and sending out the divided data streams through frequency points; receiving the divided data stream, modulating the data stream to more than one carrier wave and transmitting the data stream to a transmission network; the invention also discloses a device for modulating the program with large code rate; the invention divides the program with high code rate into a plurality of program streams, and then modulates and multiplexes the program streams to solve the technical problem that the program with bandwidth requirement more than 38Mbps can not be transmitted, thereby greatly improving the transmission rate of the video program and further realizing the transmission of the television program with ultrahigh definition and high code rate.
Description
Technical Field
The invention relates to the field of television network transmission, in particular to a method and a device for modulating a program with a large code rate.
Background
With the gradual improvement of national living standard, people also put forward higher requirements on the definition of videos, at present, 4K ultra-high definition videos gradually become the mainstream of the market, have new characteristics of high bandwidth, high compression ratio, variable code rate and the like, and need larger bandwidth and smaller delay during transmission, which puts forward higher requirements on the implementation complexity and performance management of encoders and multiplexers of digital televisions, cable television transmission networks and terminal demodulation equipment.
The resolution of the extreme 4K ultra-high definition television program is 3840 × 2160, the frame rate is 100/120P, the sampling is 12bit, and the demand of the direct broadcasting bandwidth can reach 52Mbps to 71.5 Mbps; with the development of technology and the popularization and application of ultra-high-definition televisions, the resolution 7680 x 4320, the frame rate 120P, the sampling 12bit, and the bandwidth of an 8K ultra-high-definition television program or a television program with higher definition are more demanding, and the demand for the direct broadcast bandwidth is as high as 104Mbps to 130Mbps, which indicates that there is a higher demand for the data transmission rate in the cable television transmission network in the future. Obviously, the transmission capability of a single frequency point at the present stage is difficult to meet the requirement of transmitting a high-definition video program with a large code rate.
In the prior art, most domestic cable television operators adopt a DVB-C system, use a 64-QAM mode for modulation, and under the bandwidth of an 8MHz channel, the theoretical transmission rate is 38Mbps, so that programs with bandwidth requirements larger than 38Mbps cannot be transmitted.
Disclosure of Invention
The invention provides a method and a device for modulating a program with a large code rate, which are used for solving the technical problem that the program with the bandwidth requirement of more than 38Mbps cannot be transmitted, thereby greatly improving the transmission rate of a video program and further realizing the transmission of a television program with ultrahigh definition and a large code rate.
In order to solve the above technical problem, an embodiment of the present invention provides a method for modulating a program with a large code rate, including:
dividing a single program TS stream or a multi-program TS stream into a plurality of data streams according to a certain rule, and sending out the divided data streams through frequency points;
and receiving the divided data stream, modulating the data stream to more than one carrier wave and transmitting the data stream to a transmission network.
As a preferred scheme, the dividing a single program TS stream or a multi-program TS stream into a plurality of data streams according to a certain rule, and sending out the divided data streams through a frequency point includes:
receiving a video program TS stream and judging whether the code rate of the program TS stream is greater than a preset code rate, if not, multiplexing the program TS stream, and if so, executing the next step;
selecting a data segmentation mode according to the program TS stream and generating a configuration file;
and dividing the TS stream according to the data division mode selected in the configuration file, and multiplexing the divided TS stream.
Preferably, the configuration file comprises frequency point combinations selected and used by the video programs and selected data segmentation modes,
the frequency point combination selected and used by the video program is used for recording the transmission frequency points through which the segmented data streams pass;
the selected data division mode is used for recording a mode of dividing the TS stream.
As a preferred scheme, the transmission frequency points at least include two different frequency points, wherein the first frequency point is a main frequency point, and the main frequency point data stream includes a configuration file.
Preferably, the selected frequency points comprise 64-QAM or 256-QAM or a mixed frequency point combination of 64-QAM and 256-QAM.
Preferably, the method of configuring the configuration file comprises statically generating the configuration file through manual configuration or dynamically generating the configuration file according to a certain rule,
the manually configured static generation configuration file forms a frequency point combination by selecting a certain number of frequency points, and the data stream shares the load of all the selected frequency points, so that the high utilization rate of the frequency points is realized;
the method comprises the steps of dynamically generating a configuration file according to a certain rule, forming frequency point combinations by selecting a certain number of frequency points, dividing active frequency points M and inactive frequency points N into two types, carrying out load sharing on data streams through the active frequency points, and automatically starting the inactive frequency points to guarantee data transmission when the active frequency points fail.
Preferably, the dividing method includes performing balanced division according to frequency point combinations, performing overflow division according to the frequency point combinations, performing stream-by-stream division according to the frequency point combinations, performing division according to available bandwidths of each frequency point in the frequency point combinations, performing division according to weights of the frequency points, and performing division according to the quality of the frequency points.
As a preferred scheme, the receiving the divided data stream, modulating the data stream to a carrier, and transmitting the modulated data stream to a transmission network further includes: and monitoring the condition of interference or fault at the frequency point, and sending feedback abnormal information.
The device for modulating the large code rate program comprises a multiplexer and a modulator,
the multiplexer divides a single program TS stream or a multi-program TS stream into a plurality of data streams according to a certain rule and sends the divided data streams to the modulator;
the modulator comprises a modulation module, the modulation module receives the divided data stream, modulates the data stream to a carrier wave and then transmits the carrier wave to a transmission network, and the multiplexer is connected with the modulator.
Preferably, the multiplexer comprises a judging module, a configuring module, a dividing module and a multiplexing module,
the judging module is used for receiving a video program TS stream and judging whether the code rate of the program TS stream is greater than a preset code rate, if so, the program TS stream is transmitted to the configuration module, and if not, the program TS stream is transmitted to the multiplexing module;
the configuration module is used for selecting a data segmentation mode, generating and storing a configuration file, and receiving feedback information to dynamically adjust the configuration file;
the division module is used for dividing the TS stream according to the data division mode selected in the configuration file and transmitting the divided TS stream to the multiplexing module;
the multiplexing module is used for acquiring the program TS sent by the judging module and integrating the TS sent by the dividing module, and transmitting the integrated TS to the modulator.
Preferably, the configuration file comprises frequency point combinations selected and used by the video programs and selected data segmentation modes,
the frequency point combination selected and used by the video program is used for recording the transmission frequency points through which the segmented data streams pass;
the selected data division mode is used for recording a mode of dividing the TS stream.
As a preferred scheme, the transmission frequency points at least include two different frequency points, wherein the first frequency point is a main frequency point, and the main frequency point data stream includes a configuration file.
Preferably, the selected frequency points comprise 64-QAM or 256-QAM or a mixed frequency point combination of 64-QAM and 256-QAM.
Preferably, the method of configuring the configuration file comprises statically generating the configuration file through manual configuration or dynamically generating the configuration file according to a certain rule,
the manually configured static generation configuration file forms a frequency point combination by selecting a certain number of frequency points, and the data stream shares the load of all the selected frequency points, so that the high utilization rate of the frequency points is realized;
the method comprises the steps of dynamically generating a configuration file according to a certain rule, forming frequency point combinations by selecting a certain number of frequency points, dividing active frequency points M and inactive frequency points N into two types, carrying out load sharing on data streams through the active frequency points, and automatically starting the inactive frequency points to guarantee data transmission when the active frequency points fail.
Preferably, the dividing method includes performing balanced division according to frequency point combinations, performing overflow division according to the frequency point combinations, performing stream-by-stream division according to the frequency point combinations, performing division according to available bandwidths of each frequency point in the frequency point combinations, performing division according to weights of the frequency points, and performing division according to the quality of the frequency points.
As a preferred scheme, the modulator further includes a feedback module, where the feedback module is responsible for monitoring the interference or fault condition at the frequency point, and sending the abnormal information back to the multiplexer.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the technical problem that programs with bandwidth requirements larger than 38Mbps cannot be transmitted is solved by dividing a high-bit-rate program into a plurality of program streams and modulating and multiplexing the program streams, so that the transmission rate of video programs is greatly improved, and the transmission of ultrahigh-definition high-bit-rate television programs is realized.
Drawings
FIG. 1: the invention is a flow diagram in the embodiment of a method for modulating a program with a large code rate;
FIG. 2: the invention is a structure diagram in the embodiment of a device for modulating a large code rate program;
FIG. 3: is a schematic flow chart of steps of another embodiment of the present invention;
FIG. 4: is a schematic structural diagram of another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a preferred embodiment of the present invention provides a method for modulating a large code rate program, including:
s1, dividing a single program TS flow or a multi-program TS flow into a plurality of data flows according to a certain rule, and sending out the divided data flows through frequency points;
s2, receiving the divided data stream, modulating it to more than one carrier, and transmitting to the transmission network.
In this embodiment, the step S1 is to divide a single program TS stream or a multiple program TS stream into multiple data streams according to a certain rule, and send the divided multiple data streams through frequency points, including:
s11, receiving a video program TS stream and judging whether the code rate of the program TS stream is larger than a preset code rate, if not, multiplexing the program TS stream, and if so, executing the next step;
s12, selecting a data segmentation mode according to the program TS stream and generating a configuration file;
and S13, dividing the TS stream according to the data division mode selected in the configuration file, and multiplexing the divided TS stream.
In this embodiment, the configuration file includes the frequency point combination selected for use by the video program and the selected data dividing manner,
the frequency point combination selected and used by the video program is used for recording the transmission frequency points through which the segmented data streams pass;
the selected data division mode is used for recording a mode of dividing the TS stream.
In this embodiment, the transmission frequency points at least include two different frequency points, where a first frequency point is a main frequency point, and the main frequency point data stream includes a configuration file.
In this embodiment, the selected frequency points include 64-QAM or 256-QAM or a mixed frequency point combination of 64-QAM and 256-QAM.
In this embodiment, the method of configuring the profile includes statically generating the profile through manual configuration or dynamically generating the profile according to a certain rule,
the manually configured static generation configuration file forms a frequency point combination by selecting a certain number of frequency points, and the data stream shares the load of all the selected frequency points, so that the high utilization rate of the frequency points is realized;
the method comprises the steps of dynamically generating a configuration file according to a certain rule, forming frequency point combinations by selecting a certain number of frequency points, dividing active frequency points M and inactive frequency points N into two types, carrying out load sharing on data streams through the active frequency points, and automatically starting the inactive frequency points to guarantee data transmission when the active frequency points fail.
In this embodiment, the segmentation methods include balanced segmentation according to frequency point combinations, overflow segmentation according to frequency point combinations, stream-by-stream segmentation according to frequency point combinations, segmentation according to available bandwidths of frequency points in the frequency point combinations, segmentation according to weights of the frequency points, and segmentation according to qualities of the frequency points.
In this embodiment, the receiving the divided data stream, modulating the data stream to a carrier, and transmitting the modulated carrier to a transmission network further includes: and monitoring the condition of interference or fault at the frequency point, and sending feedback abnormal information.
Referring to fig. 2, an embodiment of the present invention further provides an apparatus for modulating a large code rate program, including a multiplexer and a modulator,
the multiplexer divides a single program TS stream or a multi-program TS stream into a plurality of data streams according to a certain rule and sends the divided data streams to the modulator;
the modulator comprises a modulation module, the modulation module receives the divided data stream, modulates the data stream to a carrier wave and then transmits the carrier wave to a transmission network, and the multiplexer is connected with the modulator.
In this embodiment, the multiplexer includes a determining module, a configuring module, a dividing module, and a multiplexing module,
the judging module is used for receiving a video program TS stream and judging whether the code rate of the program TS stream is greater than a preset code rate, if so, the program TS stream is transmitted to the configuration module, and if not, the program TS stream is transmitted to the multiplexing module;
the configuration module is used for selecting a data segmentation mode, generating and storing a configuration file, and receiving feedback information to dynamically adjust the configuration file;
the division module is used for dividing the TS stream according to the data division mode selected in the configuration file and transmitting the divided TS stream to the multiplexing module;
the multiplexing module is used for acquiring the program TS sent by the judging module and integrating the TS sent by the dividing module, and transmitting the integrated TS to the modulator.
In this embodiment, the configuration file includes the frequency point combination selected for use by the video program and the selected data dividing manner,
the frequency point combination selected and used by the video program is used for recording the transmission frequency points through which the segmented data streams pass;
the selected data division mode is used for recording a mode of dividing the TS stream.
In this embodiment, the transmission frequency points at least include two different frequency points, where a first frequency point is a main frequency point, and the main frequency point data stream includes a configuration file.
In this embodiment, the selected frequency points include 64-QAM or 256-QAM or a mixed frequency point combination of 64-QAM and 256-QAM.
In this embodiment, the method of configuring the profile includes statically generating the profile through manual configuration or dynamically generating the profile according to a certain rule,
the manually configured static generation configuration file forms a frequency point combination by selecting a certain number of frequency points, and the data stream shares the load of all the selected frequency points, so that the high utilization rate of the frequency points is realized;
the method comprises the steps of dynamically generating a configuration file according to a certain rule, forming frequency point combinations by selecting a certain number of frequency points, dividing active frequency points M and inactive frequency points N into two types, carrying out load sharing on data streams through the active frequency points, and automatically starting the inactive frequency points to guarantee data transmission when the active frequency points fail.
In this embodiment, the segmentation methods include balanced segmentation according to frequency point combinations, overflow segmentation according to frequency point combinations, stream-by-stream segmentation according to frequency point combinations, segmentation according to available bandwidths of frequency points in the frequency point combinations, segmentation according to weights of the frequency points, and segmentation according to qualities of the frequency points.
In this embodiment, the modulator further includes a feedback module, where the feedback module is responsible for monitoring the interference or fault condition at the frequency point, and sending and feeding back the abnormal information to the multiplexer.
Referring to fig. 3, according to the present invention, the embodiment further provides a method for transmitting a high rate program, including:
s1, using the method for modulating the program with large code rate to modulate data flow;
s2, receiving the modulated data stream through the communication cable, demodulating and recombining the modulated data stream, and demultiplexing and converting into image content.
In this embodiment, the step S2 of receiving the modulated data stream through the communication cable, demodulating and recombining the modulated data stream, and demultiplexing the data stream into image content includes:
s21, detecting the modulated data flow to judge whether there is a configuration file, if not, demodulating and demultiplexing the modulated data flow to form an image, if yes, executing the next step;
s22, reading frequency points and division combination, and reading corresponding data streams from different frequency points;
and S23, reading corresponding data streams from different frequency points through an algorithm, recombining the data streams to restore the data streams into a complete video program signal, and demultiplexing the complete video program signal to form an image.
In this embodiment, the communication cable includes an optical cable or a coaxial cable.
Referring to fig. 4, according to the present invention, this embodiment can also provide a system for transmitting a high rate program, which includes the above-mentioned apparatus for modulating a high rate program and a demodulation terminal,
the device for modulating the large code rate program is used for modulating data stream;
the demodulation terminal receives the modulated data stream through a communication cable, demodulates and recombines the modulated data stream, and converts the modulated data stream into image content through demultiplexing.
In this embodiment, the demodulation terminal comprises a detection module, a demodulation module, a picture reorganizing module and a demultiplexing module,
the demodulation module comprises a first demodulation module and a second demodulation module, the detection module detects the modulated data stream and judges whether a configuration file exists or not, if not, the modulated data stream is transmitted to the first demodulation module, and if so, the modulated data stream is transmitted to the second demodulation module; the first demodulation module demodulates the modulated data stream and transmits the demodulated data stream to the demultiplexing module, and the second demodulation module is used for reading frequency points and segmenting combinations, reading corresponding data streams from different frequency points and transmitting the corresponding data streams to the picture recombination module; the picture recombination module is responsible for receiving configuration files and data stream data from the demodulation module, recombining corresponding data streams read from different frequency points through an algorithm and transmitting the recombined data streams to the demultiplexing module; the demultiplexing module is used for demultiplexing the received data stream and forming an image after audio and video decoding.
In this embodiment, the communication cable includes an optical cable or a coaxial cable.
The present invention will be described in detail with reference to examples.
A multiplexer:
A. defining: the traditional multiplexer multiplexes a plurality of single program TS streams or multi-program TS streams into a multi-program TS stream containing the code stream contents, and generally provides functions of mapping and generating PID, Service ID, Tansport ID, SI, PSI and the like. In the invention, the multiplexer has the traditional function, and also has the function of dividing a single program TS stream or a multi-program TS stream into a plurality of data streams according to a certain rule, and the plurality of divided data streams can be recombined and restored into the original code stream.
B. The function is as follows:
1. parameters in the TS stream can be modified;
2. the SI and PSI can be mapped and generated, and the contents of the SI and PSI can be modified;
3. the TS stream can be segmented;
4. multiple single program TS streams, multiple program TS streams and divided data streams can be multiplexed into a multiple program TS stream containing the code stream contents.
C. Submodule
1. Configuration module
a. Defining: the configuration module is used for generating and storing configuration files. The configuration file comprises two parts of frequency point combination used by video program selection and selected data division mode. The selected frequency point combination is used for recording which frequency points the divided data stream is transmitted through, and at least comprises two different frequency points, wherein the data stream of the first frequency point (main frequency point) comprises a configuration file; the selected frequency point can not be limited to the frequency point modulated by 64-QAM, and various frequency point combination modes such as 64-QAM, 256-QAM or the mixture of 64-QAM and 256-QAM can be adopted; the selected data splitting scheme is used to record which scheme is used to split the TS stream. The configuration file may be generated statically through manual configuration or dynamically according to certain rules. Manually configuring a static generation configuration file: and selecting a certain number of frequency points to form a frequency point combination, and sharing the load of the data stream through all the selected frequency points to realize the high utilization rate of the frequency points. Dynamically generating a configuration file according to a certain rule: selecting a certain number of frequency points to form a frequency point combination, dividing the frequency points into an active frequency point M and an inactive frequency point N, carrying out load sharing on data streams through the active frequency points, and automatically starting the inactive frequency points to guarantee data transmission when the active frequency points fail; the upper limit and the lower limit of the number of the active frequency points can be configured, the priority of the frequency points can be configured, and the inactive frequency points can preempt the active frequency points through the priority ratio and should preempt delay.
b. The function is as follows:
i. generating a configuration file, and recording frequency point combinations selected and used by the divided TS streams and the selected data division modes;
dynamically adjusting the configuration file according to some feedback information.
2. Segmentation module
a. Defining: a single program TS stream or a multi-program TS stream is divided into a plurality of data streams according to a certain rule, and the divided data streams can be recombined and restored into an original code stream.
b. The function is as follows: and the segmentation module segments the TS stream according to the data segmentation mode selected from the configuration file.
c. The segmentation method comprises the following steps: the following 6 division methods are defined
i. Carrying out balanced segmentation according to frequency point combinations: assuming that a 60Mbps video program is transmitted and there are 3 frequency points in the frequency point combination, the 60Mbps video program is averagely divided into a data stream A20 Mbps, a data stream B20 Mbps and a data stream C20 Mbps, wherein the data stream A is transmitted through the frequency point 1, the data stream B is transmitted through the frequency point 2, and the data stream C is transmitted through the frequency point 3.
Performing overflow type segmentation according to the frequency point combination: assuming that a 60Mbps video program is transmitted, 3 frequency points are arranged in the frequency point combination, and the upper limit of the code stream of each data stream is set to be about 35Mbps of 92% frequency point bandwidth, the 60Mbps video program is divided into data stream A35 Mbps, data stream B25 Mbps and data stream C0 Mbps. Data stream a is sent through frequency point 1, and data stream B is sent through frequency point 2.
And iii, carrying out flow-by-flow segmentation according to the frequency point combination: supposing that 60Mbps video programs are transmitted, 3 frequency points are arranged in the frequency point combination, the upper limit of each data stream code stream is set to be 6Mbps, then the data stream A6 Mbps, the data stream B6 Mbps, the data stream C6 Mbps, the data stream D6 Mbps, the data stream E6 Mbps and the data stream F6 Mbps, wherein the data stream A, D is transmitted through the frequency point 1, the data stream B, E is transmitted through the frequency point 2, and the data stream C, F is transmitted through the frequency point 3.
And iv, dividing according to the available bandwidth of each frequency point in the frequency point combination: assuming that a 60Mbps video program is transmitted, 3 frequency points are arranged in a frequency point combination, wherein the available bandwidth set at the frequency point 1 is 30Mbps, the available bandwidth set at the frequency point 2 is 20Mbps, and the available bandwidth set at the frequency point 3 is 10Mbps, then according to the proportion of the available bandwidths, a data stream A of 30Mbps, a data stream B of 20Mbps and a data stream C of 10Mbps are automatically transmitted according to the proportion of a ratio of 3:2:1, wherein the data stream A is transmitted through the frequency point 1, the data stream B is transmitted through the frequency point 2, and the data stream C is transmitted through the frequency point 3.
v, segmenting according to the weight of the frequency points: assuming that a 60Mbps video program is transmitted, 3 frequency points are arranged in a frequency point combination, wherein the weight of the frequency point 1 is set to be 3, the weight of the frequency point 2 is set to be 2, and the weight of the frequency point 3 is set to be 1, then data stream A30Mbps, data stream B20 Mbps and data stream C10 Mbps are automatically transmitted according to the ratio of 3:2:1, wherein the data stream A is transmitted through the frequency point 1, the data stream B is transmitted through the frequency point 2, and the data stream C is transmitted through the frequency point 3.
And vi, segmenting according to the quality of the frequency points: assuming that a 60Mbps video program is transmitted, 4 frequency points are arranged in the frequency point combination, wherein 3 frequency points are active frequency points, and 1 frequency point is an inactive frequency point, and the active frequency points are divided according to the above i to v. When the received feedback information indicates that some active frequency point has interference or fault, the multiplexer automatically adjusts the configuration file, and starts the inactive frequency point to replace the frequency point for data distribution; when the feedback information is received to indicate that the frequency point is recovered to be normal, after a period of preemption delay, the multiplexer automatically adjusts the configuration file and starts the frequency point to replace the original inactive frequency point for data transmission.
II, modulator:
A. defining: a QAM modulator in the digital television carries out 64-QAM modulation on the TS stream, namely, a baseband signal of the TS stream is modulated onto a carrier wave and then sent to a cable television network.
B. The function is as follows:
1. modulating a baseband signal of the TS stream or the divided data stream onto a carrier, and then sending the carrier to a cable television network;
2. and if the interference or the fault of any frequency point is found, sending feedback information to the multiplexer.
C. Submodule:
1. modulation module
a. The concept is as follows: and carrying out 64-QAM modulation on the base band signal of the TS stream or the divided data stream.
b. The function is as follows: and modulating a baseband signal of the TS stream or the divided data stream onto a carrier, and then sending the carrier to a cable television network.
2. Feedback module (internal or external)
a. The concept is as follows: and monitoring the state of the modulator and the transmission network, and feeding back the abnormal information to the multiplexer when any abnormality occurs.
b. The function is as follows: and if the interference or the fault of any frequency point is found, sending feedback information to the multiplexer.
It should be noted that: the configuration module and the division module can be configured in the multiplexer or the modulator; the multiplexer can be a special-purpose device, and can also be a special-purpose module of a general-purpose device (such as a server); the multiplexer and the modulator may be two separate devices or may be integrated into one complete device.
CATV transmission network
A. Defining: networks that use fiber optic or coaxial cables to carry broadcast television signals or locally played television signals.
B. The function is as follows: broadcast television signals or locally played television signals are transmitted.
III. terminal
A. Defining: a device for connecting a television set to an external signal source demodulates, demultiplexes and converts the modulated digital signal into television image content for display on the television set.
B. The function is as follows:
1. accessing to a cable television transmission network, carrying out channel decoding and information source decoding on the digital signals to form images, and displaying the images on a television;
2. channel decoding is carried out on the data stream transmitted by the multi-frequency point, a complete video program signal is formed again according to the sequence, and information source decoding and demultiplexing are completed to form an image which is displayed on a television.
C. Submodule
1. Demodulation module
a. The concept is as follows: the modulated digital signal is demodulated, converted into television image content and displayed on a television.
b. The function is as follows:
i. performing channel decoding and source decoding on the digital signal to form an image;
and ii, carrying out channel decoding on the data stream transmitted by the multi-frequency point, and sending the data stream to a picture recombination module for picture recombination.
c. And (3) demodulation process:
i. selecting frequency points according to the selected channel, demodulating to form TS stream: if no configuration file is found, demultiplexing according to the traditional flow to form an image;
and ii, if the configuration file exists, reading the frequency point combination and the data segmentation mode in the configuration file, reading corresponding data streams from different frequency points according to the content, and sending the data streams to the picture recombination module.
2. Picture recombination module
a. The concept is as follows: and recombining the plurality of divided data streams into a complete video program signal in sequence, demultiplexing the complete video program signal to form an image, and displaying the image on a television.
b. The function is as follows: and recombining the divided data streams to form an image.
c. And (3) a recombination process:
i. receiving configuration files and data stream data from a demodulation module;
and ii, recombining the data stream through a certain algorithm to restore the data stream into a complete video program signal, and demultiplexing the complete video program signal to form an image.
The invention divides the program with high code rate into a plurality of program streams, and then modulates and multiplexes the program streams to solve the technical problem that the program with bandwidth requirement more than 38Mbps can not be transmitted, thereby greatly improving the transmission rate of the video program and further realizing the transmission of the television program with ultrahigh definition and high code rate.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (4)
1. A method for modulating a high rate program, comprising:
dividing a single program TS stream or a multi-program TS stream into a plurality of data streams according to a certain rule, and sending out the divided data streams through frequency points;
receiving the divided data stream, modulating the data stream to more than one carrier wave and transmitting the data stream to a transmission network;
the said one single program TS flow or multi program TS flow is divided into multiple data flows according to certain rule, and send out multiple data flows after said division through frequency point, including:
receiving a video program TS stream and judging whether the code rate of the program TS stream is greater than a preset code rate, if not, multiplexing the program TS stream, and if so, executing the next step;
selecting a data segmentation mode according to the program TS stream and generating a configuration file;
dividing the TS stream according to the data division mode selected in the configuration file, and multiplexing the divided TS stream;
the method of the configuration file comprises the steps of generating the configuration file statically through manual configuration or dynamically according to certain rules,
the manually configured static generation configuration file forms a frequency point combination by selecting a certain number of frequency points, and the data stream shares the load of all the selected frequency points, so that the high utilization rate of the frequency points is realized;
the configuration file is dynamically generated according to a certain rule, a certain number of frequency points are selected to form a frequency point combination, the frequency points are divided into an active frequency point M and an inactive frequency point N, data streams are subjected to load sharing through the active frequency points, and the inactive frequency points are automatically started to guarantee data transmission when the active frequency points fail;
the segmentation modes comprise balanced segmentation according to frequency point combinations, overflow type segmentation according to the frequency point combinations, stream-by-stream segmentation according to the frequency point combinations, segmentation according to the available bandwidth of each frequency point in the frequency point combinations, segmentation according to the weight of the frequency point and segmentation according to the quality of the frequency point.
2. The method of claim 1, wherein the configuration file comprises frequency point combinations selected for use in video programs and selected data partitioning modes,
the frequency point combination selected and used by the video program is used for recording the transmission frequency points through which the segmented data streams pass;
the selected data division mode is used for recording a mode of dividing the TS stream.
3. An apparatus for modulating a high rate program, comprising a multiplexer and a modulator,
the multiplexer divides a single program TS stream or a multi-program TS stream into a plurality of data streams according to a certain rule and sends the divided data streams to the modulator;
the modulator comprises a modulation module, the modulation module receives the divided data stream, modulates the data stream to a carrier wave and then transmits the carrier wave to a transmission network, and the multiplexer is connected with the modulator;
the multiplexer comprises a judging module, a configuration module, a division module and a multiplexing module,
the judging module is used for receiving a video program TS stream and judging whether the code rate of the program TS stream is greater than a preset code rate, if so, the program TS stream is transmitted to the configuration module, and if not, the program TS stream is transmitted to the multiplexing module;
the configuration module is used for selecting a data segmentation mode, generating and storing a configuration file, and receiving feedback information to dynamically adjust the configuration file;
the division module is used for dividing the TS stream according to the data division mode selected in the configuration file and transmitting the divided TS stream to the multiplexing module;
the multiplexing module is used for acquiring the program TS sent by the judging module and integrating the TS sent by the dividing module, and transmitting the integrated TS to the modulator;
the method of the configuration file comprises the steps of generating the configuration file statically through manual configuration or dynamically according to certain rules,
the manually configured static generation configuration file forms a frequency point combination by selecting a certain number of frequency points, and the data stream shares the load of all the selected frequency points, so that the high utilization rate of the frequency points is realized;
the configuration file is dynamically generated according to a certain rule, a certain number of frequency points are selected to form a frequency point combination, the frequency points are divided into an active frequency point M and an inactive frequency point N, data streams are subjected to load sharing through the active frequency points, and the inactive frequency points are automatically started to guarantee data transmission when the active frequency points fail;
the segmentation modes comprise balanced segmentation according to frequency point combinations, overflow type segmentation according to the frequency point combinations, stream-by-stream segmentation according to the frequency point combinations, segmentation according to the available bandwidth of each frequency point in the frequency point combinations, segmentation according to the weight of the frequency point and segmentation according to the quality of the frequency point.
4. The apparatus of claim 3, wherein the configuration file comprises frequency point combinations selected for use by the video program and selected data partitioning manners,
the frequency point combination selected and used by the video program is used for recording the transmission frequency points through which the segmented data streams pass;
the selected data division mode is used for recording a mode of dividing the TS stream.
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| CN114615523A (en) * | 2022-03-04 | 2022-06-10 | 公诚管理咨询有限公司 | 8K video signal transmission method based on HFC network |
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