CN115278112A - End-to-end access method for realizing DTMB ultra-high definition signal wired transmission - Google Patents

End-to-end access method for realizing DTMB ultra-high definition signal wired transmission Download PDF

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Publication number
CN115278112A
CN115278112A CN202210686303.8A CN202210686303A CN115278112A CN 115278112 A CN115278112 A CN 115278112A CN 202210686303 A CN202210686303 A CN 202210686303A CN 115278112 A CN115278112 A CN 115278112A
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CN
China
Prior art keywords
dtmb
television
signal
signals
optical
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Pending
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CN202210686303.8A
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Chinese (zh)
Inventor
陈松
文俊林
王伟
张春雷
潘林
杨飞
钱睿
钱嘉炜
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Jiangsu Broadcasting Cable Information Network Corp ltd
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Jiangsu Broadcasting Cable Information Network Corp ltd
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Priority to CN202210686303.8A priority Critical patent/CN115278112A/en
Publication of CN115278112A publication Critical patent/CN115278112A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/015—High-definition television systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/268—Signal distribution or switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/22—Adaptations for optical transmission

Abstract

The invention discloses an end-to-end access method for realizing wired transmission of DTMB ultra-high definition signals, which comprises the following steps: completing DTMB modulation of a broadcasting and television IP signal at the front end of a broadcasting and television, generating a DTMB broadcast television signal, and completing electric signal coupling transmission with a broadcasting and television DVB-C signal; external dimming and light amplification of the DTMB modulation signal are completed at the front end of the radio and television; transmitting the DTMB broadcast television signal after optical processing through an FTTH network of a broadcast television network; at a receiving end, optical transmission channel decoding is completed through optical receiving equipment, and the optical transmission channel decoding is restored into a DTMB modulation signal; at a television terminal, a DTMB broadcast television signal is accessed to a DTMB interface of a television through an RJ45 and RF (radio frequency) conversion connector, and the DTMB covers an access solution, so that the controllable access of a video service is realized, the access capability of the television video service is improved, and a good application scene is achieved.

Description

End-to-end access method for realizing wired transmission of DTMB ultra-high definition signals
Technical Field
The invention belongs to the technical field of broadcasting and television signal transmission, and particularly relates to an end-to-end access method for realizing DTMB ultra-high definition signal wired transmission.
Background
With the development of digitalization and informatization technology and the forced popularization of the DTMB standard television, the application of the terrestrial digital multimedia broadcasting DTMB is continuously popularized. At present, the popularization of the DTMB service faces two difficulties: firstly, the outdoor antenna is difficult to erect, and a radio frequency cable needs to be pre-embedded, so that the access of a user is seriously influenced; secondly, the through-wall attenuation of the wireless signals is too large, and even if the DTMB set top box is installed through an indoor antenna, the quality of the video watched by a user is seriously influenced.
Disclosure of Invention
The invention aims to overcome the difficulty of user coverage of DTMB broadcast television signals and provide an end-to-end solution for concurrent transmission of the DTMB broadcast television signals, DVB broadcast television signals and broadband data signals. The method comprises The steps of accessing a network by using FTTH (Fiber To The Home) of a Broadcast television network, realizing The parallel high-quality channel optical transmission of a Digital television Broadcasting (DTMB) Broadcast television signal and a DVB-C (Digital Video Broadcasting-Cable) modulated Broadcast television signal and a broadband bidirectional data signal into a Home, and realizing The ultra-high-definition Digital television Broadcasting (DTMB) direct Broadcast access of a user through RJ45 network Cable transmission after The signals enter The Home.
The invention relates to a solution for realizing ultra-high-definition access without a box end by modulating an ultra-high-definition signal into a DTMB broadcast television signal under the DTMB standard, realizing parallel optical transmission with a DVB-C modulation signal and a broadband data service through an FTTH access network of a broadcast television network, and transmitting in an RJ45 network cable mode after entering a home. The scheme provides an end-to-end access method for realizing the wired transmission of a DTMB ultra-high definition signal, which comprises the following steps:
1) Completing DTMB modulation of a broadcasting and television IP signal at the front end of a broadcasting and television, generating a DTMB broadcast television signal, and completing electric signal coupling transmission with a broadcasting and television DVB-C signal;
2) Finishing external dimming and light amplification of the DTMB modulation signal at the front end of the radio and television;
3) Transmitting the DTMB broadcast television signal after optical processing through an FTTH access network of a broadcast television network;
4) At a receiving end, decoding of an optical transmission channel is completed through optical receiving equipment, and the optical transmission channel is restored into an electric signal modulated by DTMB;
5) At the television end, the DTMB broadcast television signal is accessed to a DTMB interface of the television through an RJ45 and RF conversion connector;
6) At a receiving end, a set-top box is not needed, and signal receiving, decoding and playing are realized through a DTMB module carried by the television.
As an improvement of the invention, in 1), the radio and television IP signal includes a UDP transmission code stream in an HEVC format, an h.264 format, or an AVS + format, where the HEVC format is mainly used for transmitting a 4K ultra high definition signal, and can realize high-quality and high-code-rate ultra high definition signal transmission within a limited frequency point bandwidth, the h.264 and AVS + formats are mainly used for high definition signal transmission, and the AVS + is a domestic coding standard.
As an improvement of the invention, 1) in the method, radio frequency signals of the broadcasting and television DVB-C standard and radio frequency signals of the DTMB standard are planned through non-overlapping frequency points to realize non-interference parallel transmission, and because the radio frequency spectrums of the DVB-C standard and the DTMB standard are almost the same, the frequency ranges of 171 to 219MHz and 474 to 866MHz adopted by the DTMB standard are completely the same as the frequency range of the DVB-C standard, so that the parallel transmission of the DTMB signal and the DVB-C signal can be realized only by planning the non-overlapping frequency points.
As an improvement of the present invention, 1) in the DTMB broadcast television signal operation mode, 64QAM modulation is adopted. Under the DTMB standard, modulation modes such as 4QAM-NR, 4QAM, 16QAM, 32QAM, 64QAM and the like can be adopted. Because the DTMB broadcast television signals related to the invention are transmitted in a high-quality transmission cable environment, a 64QAM modulation mode with larger transmission bandwidth is adopted to realize the coverage of ultra-high-definition signals and more programs.
Based on the technical scheme, the DTMB modulation of the coded format ultra-high definition signal and the H.264/AVS + coded format high definition signal of HEVC high efficiency compression is completed at the front end of the broadcasting and television, the DTMB broadcast television signal is generated, and the DTMB broadcast television signal and the DVB-C signal are coupled and transmitted.
As an improvement of the invention, 2) in the method, the signal obtained by coupling the DTMB broadcast television signal and the DVB-C is modulated into an optical signal by 1550nm wavelength external modulation optical transmission equipment, and the optical signal is amplified by EDFA/EYDFA (erbium-doped fiber amplifier or erbium-yttrium co-doped fiber amplifier).
Based on the technical scheme, the external dimming light emission, the light amplification and the light transmission of the DTMB modulation signal are completed through the broadcast television network.
As an improvement of the present invention, in 3), the optically processed DTMB broadcast television signal is subjected to overlay transmission via an optical transmission system with a wavelength of 1550nm in a radio and television FTTH network.
As an improvement of the present invention, 4), at the receiving end, the optical transmission channel decoding is completed by a broadcast 1550nm optical receiver or a two-in-one ONU (optical network unit), and the optical signal is reduced to a DTMB modulated electrical signal.
As an improvement of the present invention, 4), after the optical channel decoding is completed, the DTMB broadcast television signal is transmitted through 4 cores in the RJ45 network cable, the restored DTMB broadcast television signal is transmitted through the RJ45 network cable to complete the television access, 4 cores in the RJ45 network cable are used to transmit the data service signal, the remaining four cores are converted by RF and RJ45 to transmit the DTMB broadcast television signal, and the DTMB broadcast television signal is transmitted through 4 cores in the RJ45 network cable.
As an improvement of the invention, 4) the optical receiver further comprises a radio frequency F connector to RJ45 converter, and the electrical signal output by the optical receiver is transmitted through an RJ45 network cable.
Based on the technical scheme, at a receiving end, decoding of a transmission channel is completed through simple broadcasting and television optical receiving equipment, and the transmission channel is restored into a DTMB modulation signal; the DTMB broadcast television signals after entering the home are transmitted through RJ45 network cables for home decoration. 4 cores in the RJ45 network cable are used for transmitting data service signals, and the other four cores are converted with the RJ45 through RF to transmit DTMB broadcast television signals.
As an improvement of the invention, 5), when the signal is transmitted to the vicinity of the DTMB input interface of the television, the DTMB broadcast television signal is input into the television through the RJ 45-to-radio frequency connector converter, and the demodulation of the DTMB broadcast television electrical signal is completed through the DTMB functional module of the television, and the signal is restored into a video/audio code stream and is decoded and played.
Based on the technical scheme, at the television end, the DTMB broadcast television signals are accessed into a DTMB interface of the television through the RJ45 and the RF adapter; and the television is forced to be provided with a DTMB module, so that the television service display is realized.
Compared with the prior art, the invention has the beneficial effects that: the DTMB coverage access solution based on the scheme of the invention realizes the home-entry by utilizing a radio and television wired network and the access by utilizing an RJ45 network cable, completes the transmission and sharing of end-to-end video services, does not influence the family data services, and has the ultrahigh-definition video service coverage capability; this DTMB covers access solution, owing to accessed the online broadcast control platform of broadcast television network to with the broadcast television present net live broadcast program isogenesis, consequently realized the management and control access of video service, simultaneously, DTMB technique realizes broadcast television network user's access diversity in the new application of broadcast television network, has promoted broadcast television video service's access ability, has fine application scene.
Drawings
Fig. 1 is a schematic diagram of a process for implementing DTMB broadcast television signal coverage by a cable network of broadcasting and television according to the present invention.
Fig. 2 is a schematic diagram of an indoor access process of a DTMB broadcast television signal after entering the home.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and detailed description, which will be understood as being illustrative only and not limiting in scope.
The embodiment is as follows: the embodiment provides a method for realizing optical transmission of a DTMB modulated electric signal by utilizing optical transmitting and optical amplifying equipment of a broadcasting and television DVB-C standard under a broadcasting and television cable network architecture, and realizing high-quality optical fiber access of a DTMB television signal by utilizing a broadcasting and television FTTH network; at a terminal, a DTMB optical modulation signal is photoelectrically converted and restored into an electric signal by utilizing a broadcast and television DVB-C standard optical receiving device, and after the DTMB optical modulation signal enters a home, data and DTMB television services are safely and efficiently accessed simultaneously through an RJ-45 network cable; under the invention, no additional receiving and processing equipment is needed, and the ultrahigh-definition television service coverage capability is provided, the scheme is an ultrahigh-definition signal transmission coverage inorganic set-top box end-to-end access method, as shown in fig. 1, the method comprises the following steps:
1) At the front end of the broadcasting and television, completing DTMB modulation of broadcasting and television IP signals, generating DTMB broadcast television signals, and completing electric signal coupling transmission with broadcasting and television DVB-C signals;
2) Finishing external dimming and light amplification of the DTMB modulation signal at the front end of the radio and television;
3) Transmitting the DTMB broadcast television signal after optical processing through an FTTH access network of a broadcast television network;
4) At a receiving end, decoding of an optical transmission channel is completed through optical receiving equipment, and the optical transmission channel is restored into an electrical signal modulated by DTMB;
5) At the television end, the DTMB broadcast television signals are connected to a DTMB interface of the television through an RJ45 and RF conversion connector.
6) At a receiving end, a set-top box is not needed, and signal receiving, decoding and playing are realized through a DTMB module carried by the television.
Further, in 1), the radio and television IP signal includes a UDP transport stream in HEVC format, h.264 format, or AVS + format.
Further, in 1), radio frequency signals of the broadcasting and television DVB-C standard and radio frequency signals of the DTMB standard are planned through non-overlapping frequency points, and in 1), a DTMB broadcast television signal working mode adopts 64QAM modulation. And at the front end of the radio and television, completing DTMB modulation of an HEVC high-efficiency compressed coded format signal, generating a DTMB broadcast television signal, and completing coupling transmission with a DVB-C signal.
Further, in 2), the signal obtained by coupling the DTMB broadcast television signal and the DVB-C is modulated into an optical signal through 1550nm external modulation of the radio and television, and the optical signal is amplified through the EDFA/EYDFA. And the external dimming emission, the optical amplification and the FTTH access of the DTMB modulation signal are completed through a broadcast television network.
Further, in 3), the DTMB broadcast television signal after optical processing is subjected to overlay transmission via a 1550nm optical transmission system in the broadcast and television FTTH network.
Further, as shown in fig. 2, 4), at the receiving end, the optical transmission channel decoding is completed through a radio 1550nm optical receiver or a two-in-one ONU, and the optical signal is reduced to a DTMB modulated electrical signal.
Further, in 4), after the optical channel decoding is completed, the restored DTMB broadcast television signals are transmitted through the RJ45 network cable to complete television access, 4 cores in the RJ45 network cable are used for transmitting data service signals, the remaining four cores are converted through RF and RJ45 to be used for transmitting the DTMB broadcast television signals, and the DTMB broadcast television signals are transmitted through the 4 cores in the RJ45 network cable.
Further, 4) also includes a radio frequency F connector to RJ45 converter, and transmits the electrical signal output by the optical receiver through an RJ45 network cable. At a receiving end, decoding a transmission channel is completed through simple broadcasting and television optical receiving equipment, and the transmission channel is restored into an electric signal modulated by DTMB; the DTMB broadcast television signals after entering the home are transmitted through RJ45 network cables for home decoration. 4 cores in the RJ45 network cable are used for transmitting data service signals, and the other four cores are converted with the RJ45 through RF to transmit DTMB broadcast television signals.
Further, in 5), when the signal is transmitted to the vicinity of the DTMB input interface of the television, the DTMB broadcast television signal is input into the television through the RJ 45-to-radio frequency connector converter, and the demodulation of the DTMB modulation channel is completed through the DTMB functional module of the television, and the decoding and playing are performed. At the television end, the DTMB broadcast television signal is accessed to a DTMB interface of the television through an RJ45 and RF conversion connector; and the television service display is realized by utilizing the self-provided DTMB module of the television.
It should be noted that the above-mentioned contents only illustrate the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and it is obvious to those skilled in the art that several modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations fall within the protection scope of the claims of the present invention.

Claims (10)

1. An end-to-end access method for realizing the wired transmission of DTMB ultra-high definition signals is characterized by comprising the following steps:
1) At the front end of the broadcasting and television, completing DTMB modulation of broadcasting and television IP signals, generating DTMB broadcast television signals, and completing electric signal coupling transmission with broadcasting and television DVB-C signals;
2) External dimming and light amplification of the DTMB modulation signal are completed at the front end of the radio and television;
3) Transmitting the DTMB broadcast television signal after optical processing through a broadcast television network FTTH access network;
4) At a receiving end, optical transmission channel decoding is completed through optical receiving equipment, and an optical signal is restored into an electrical signal modulated by DTMB;
5) At a television end, accessing DTMB broadcast television signals to a DTMB interface of a television;
6) And at a receiving end, signal receiving, decoding and playing are realized through a television DTMB module.
2. The end-to-end access method for realizing the wired transmission of the DTMB ultra high definition signal according to claim 1, wherein in 1), the radio and television IP signal includes a UDP transport stream in HEVC format, h.264 format, or AVS + format.
3. The end-to-end access method for realizing the cable transmission of the DTMB ultra high definition signal according to claim 2, wherein in 1), the radio frequency signals of the broadcast television DVB-C standard and the radio frequency signals of the DTMB standard are not overlapped in frequency point planning.
4. The end-to-end access method for realizing the cable transmission of the DTMB ultra high definition signal according to claim 3, wherein in 1), the working mode of the DTMB broadcast television signal adopts 64QAM modulation.
5. The end-to-end access method for realizing the cable transmission of the DTMB ultra high definition signals according to claim 1, wherein in 2), the signals obtained by coupling the DTMB broadcast television signals and the DVB-C pass through an external light modulation device with a broadcast 1550nm wavelength to modulate electric signals into optical signals, and the optical signals are amplified through EDFA/EYDFA.
6. The end-to-end access method for implementing cable transmission of DTMB ultra high definition signals according to claim 1, wherein in 3), the optically processed DTMB broadcast television signals are overlay-transmitted via 1550nm wavelength optical transmission system in a radio and television FTTH network.
7. The end-to-end access method for achieving cable transmission of ultra high definition DTMB signals according to claim 1, wherein in 4), at the receiving end, the optical transmission channel decoding is completed through an optical receiving device with a broadcast and television wavelength of 1550nm or a two-in-one ONU, and the optical signal is restored to the electrical signal modulated by DTMB.
8. The end-to-end access method for implementing cable transmission of ultra high definition DTMB signals according to claim 7, wherein in 4), after completing the optical channel decoding, the DTMB broadcast television signal is transmitted through 4 cores in the RJ45 network cable.
9. The end-to-end access method for achieving the wired transmission of the DTMB ultra high definition signals according to claim 8, wherein 4) further comprises a rf F plug to RJ45 converter, and the electrical signals output by the optical receiver are transmitted through an RJ45 network cable.
10. The end-to-end access method for achieving cable transmission of DTMB ultra high definition signals according to claim 1, wherein in 5), when the signals are transmitted to the vicinity of the DTMB input interface of the tv, the DTMB broadcast television signals are input into the tv through the RJ 45-to-radio frequency connector converter, and the demodulation of the DTMB broadcast television electrical signals is completed through the DTMB function module of the tv, and the signals are restored into video/audio code streams and decoded for playing.
CN202210686303.8A 2022-06-17 2022-06-17 End-to-end access method for realizing DTMB ultra-high definition signal wired transmission Pending CN115278112A (en)

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CN202210686303.8A CN115278112A (en) 2022-06-17 2022-06-17 End-to-end access method for realizing DTMB ultra-high definition signal wired transmission

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CN115278112A true CN115278112A (en) 2022-11-01

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