CN112291489A - System for simultaneously receiving DVB-C, DTMB signals by utilizing FPGA - Google Patents

System for simultaneously receiving DVB-C, DTMB signals by utilizing FPGA Download PDF

Info

Publication number
CN112291489A
CN112291489A CN202011228270.XA CN202011228270A CN112291489A CN 112291489 A CN112291489 A CN 112291489A CN 202011228270 A CN202011228270 A CN 202011228270A CN 112291489 A CN112291489 A CN 112291489A
Authority
CN
China
Prior art keywords
transport stream
fpga
fpga module
module
control cpu
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011228270.XA
Other languages
Chinese (zh)
Inventor
胡正风
马金满
王刚
翟先文
张玉
胡恩杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lootom Telcovideo Network Wuxi Co ltd
Original Assignee
Lootom Telcovideo Network Wuxi Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lootom Telcovideo Network Wuxi Co ltd filed Critical Lootom Telcovideo Network Wuxi Co ltd
Priority to CN202011228270.XA priority Critical patent/CN112291489A/en
Publication of CN112291489A publication Critical patent/CN112291489A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6112—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
    • 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]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6118—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving cable transmission, e.g. using a cable modem

Abstract

Aiming at the problem that the emergency broadcasting system terminal equipment in the prior art only supports one mode to receive audio signals and cannot simultaneously receive DTMB and DVB-C signals, the invention provides a system for simultaneously receiving DVB-C, DTMB signals by utilizing an FPGA (field programmable gate array), which can simultaneously receive the DTMB and DVB-C signals and further improve the working efficiency of the terminal equipment, and the system comprises the following components: a first tuner 1 for receiving the DVB-C signal and outputting a first intermediate frequency signal to a first demodulator DEMO 1; a second tuner 2 for receiving the DTMB signal and outputting a second intermediate frequency signal to a second demodulator DEMO 2; the first demodulator DEMO1 outputs a first transport stream TS1 to the FPGA module, and the second demodulator DEMO2 outputs a second transport stream TS2 to the FPGA module; the FPGA module determines whether to send a first transport stream TS1 and a second transport stream TS2 to the main control CPU module according to priority setting and transport stream type PID; and the master control CPU module outputs audio signals to the audio DAC, the power amplifier and the loudspeaker.

Description

System for simultaneously receiving DVB-C, DTMB signals by utilizing FPGA
Technical Field
The invention relates to the technical field of emergency broadcasting system terminal equipment, in particular to a system for simultaneously receiving DVB-C, DTMB signals by utilizing an FPGA.
Background
A common sound post/receiver-expander/adapter belongs to emergency broadcasting system terminal equipment, wherein the equipment transmits audio by using wired receiving (including a network cable and coaxial DVB-C) and wireless receiving (including DTMB, FM and 4G), customers need to meet the requirement of simultaneous receiving of the coaxial DVB-C and the wireless DTMB in some places, and a new scheme is needed to meet the requirement of simultaneous receiving because most of set-top box chips used at present only support one mode to receive audio signals and cannot simultaneously receive the DTMB and DVB-C signals.
Disclosure of Invention
Aiming at the problem that the emergency broadcasting system terminal equipment in the prior art only supports one mode to receive audio signals and cannot simultaneously receive DTMB and DVB-C signals, the invention provides a system for simultaneously receiving DVB-C, DTMB signals by utilizing an FPGA (field programmable gate array), which can simultaneously receive the DTMB and DVB-C signals and further improve the working efficiency of the terminal equipment.
The technical scheme is as follows: a system for simultaneously receiving DVB-C, DTMB signals using an FPGA, comprising: a first tuner 1, the first tuner 1 being configured to receive the DVB-C signal and output a first intermediate frequency signal to the first demodulator DEMO 1; a second tuner 2, the second tuner 2 being configured to receive the DTMB signal and output a second intermediate frequency signal to the second demodulator DEMO 2;
the first demodulator DEMO1 outputs a first transport stream TS1 to the FPGA module, and the second demodulator DEMO2 outputs a second transport stream TS2 to the FPGA module;
the FPGA module firstly processes a first transport stream TS1 or a second transport stream TS2 according to priority setting, and if the first transport stream TS1 is preferentially processed, the FPGA module determines whether to send a first transport stream TS1 to the main control CPU module according to a transport stream type PID1 in the first transport stream TS 1; if the second transport stream TS2 is preferentially processed, the FPGA module determines whether to send the second transport stream TS2 to the main control CPU module according to the transport stream type PID2 in the second transport stream TS 2;
the main control CPU module obtains and outputs audio signals to the audio DAC, the power amplifier and the loudspeaker by analyzing the first transmission stream TS1 or the second transmission stream TS 2.
It is further characterized in that:
the priority setting in the FPGA module is specifically as follows: when the FPGA module receives the first transport stream TS1 and the second transport stream TS2 at the same time, if the priority of the DVB-C signal is set to be high, the FPGA module processes the first transport stream TS1 first; if the priority of the DTMB signal is set to be high, the FPGA module processes the second transport stream TS2 first.
The FPGA module determines whether to send the first transport stream TS1 to the main control CPU module according to the transport stream type PID1 in the first transport stream TS1 specifically is: if the transport stream type PID1 in the first transport stream TS1 is equal to the transport stream type setting value PID, the first transport stream TS1 is sent to the main control CPU module; the FPGA module determines whether to send the second transport stream TS2 to the main control CPU module according to the transport stream type PID2 in the second transport stream TS2 specifically is: if the transport stream type PID2 of the second transport stream TS2 is equal to the transport stream type set value PID, the second transport stream TS2 is sent to the main control CPU module.
When the FPGA module processes the first transport stream TS1, if the first transport stream TS1 is an on-air message and an off-air message, the FPGA module sends the on-air message and the off-air message to the CPU module; when the FPGA module processes the second transport stream TS2, if the second transport stream TS2 is a broadcast message and an off-air message, the FPGA module sends the broadcast message and the off-air message to the CPU module; the main control CPU module obtains a program number by analyzing the broadcast message, and sets the transmission stream type number setting value PID in the FPGA module as the program number; and when the main control CPU module receives the off-air message, clearing the PID of the set value of the transmission stream type number in the FPGA module.
The FPGA module communicates with a first tuner TUNNER1, a second tuner TUNNER2, a first demodulator DEMO1, a second demodulator DEMO2 over an I2C bus.
The FPGA module is communicated with the main control CPU through an SPI bus.
After the FPGA module is powered on, the main control CPU module carries out frequency locking operation on the FPGA module.
The invention provides a system for simultaneously receiving DVB-C, DTMB signals by utilizing an FPGA (field programmable gate array), which has the following beneficial effects compared with the prior art: the method comprises the steps of simultaneously receiving the TS messages of DVB-C, DTMB by setting an FPGA module, processing one of the messages according to priority setting, and then sending the selected TS message to a main control CPU for analysis according to a program number to obtain an audio signal, so that the problems that in the prior art, an emergency broadcasting system terminal device only supports one mode to receive the audio signal and cannot simultaneously receive DTMB and DVB-C signals are solved, the FPGA module monitors the TS messages of the two signals received simultaneously, and only sends the start-broadcast message, the stop-broadcast message and the message with the program PID equal to the PID setting value in the FPGA to the main control CPU module, so that the main control CPU module only needs to complete the analysis of the TS messages of the selected program, the calculation amount of the main control CPU is reduced, and the working efficiency of the device is further improved.
Drawings
Fig. 1 is a schematic diagram of the elements of the FPGA simultaneously receiving DVB-C, DTMB signals.
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 system for simultaneously receiving DVB-C, DTMB signals by using an FPGA is characterized in that: the FPGA module communicates with a first tuner TUNNER1, a second tuner TUNNER2, a first demodulator DEMO1, a second demodulator DEMO2 over an I2C bus.
The FPGA module is communicated with the main control CPU through an SPI bus.
After the FPGA module is powered on, the main control CPU module carries out frequency locking operation on the FPGA module.
A first tuner 1, the first tuner 1 being configured to receive the DVB-C signal and output a first intermediate frequency signal to the first demodulator DEMO 1; a second tuner 2, the second tuner 2 being configured to receive the DTMB signal and output a second intermediate frequency signal to the second demodulator DEMO 2; the first demodulator DEMO1 outputs a first transport stream TS1 to the FPGA module, and the second demodulator DEMO2 outputs a second transport stream TS2 to the FPGA module.
When the FPGA module processes the first transport stream TS1, if the first transport stream TS1 is a broadcast message and an off-air message, the FPGA module sends the broadcast message and the off-air message to the CPU module; when the FPGA module processes the second transport stream TS2, if the second transport stream TS2 is a broadcast message and an off-air message, the FPGA module sends the broadcast message and the off-air message to the CPU module; the main control CPU module obtains a program number by analyzing the broadcast message, and sets the transmission stream type number setting value PID in the FPGA module as the program number; and when the main control CPU module receives the off-air message, clearing the PID of the set value of the transmission stream type number in the FPGA module.
The priority setting in the FPGA module is specifically as follows: when the FPGA module receives the first transport stream TS1 and the second transport stream TS2 at the same time, if the priority of the DVB-C signal is set to be high, the FPGA module processes the first transport stream TS1 first; if the priority of the DTMB signal is set to be high, the FPGA module processes the second transport stream TS2 first.
Firstly, the FPGA module processes a first transport stream TS1 or a second transport stream TS2 according to priority setting, and if the first transport stream TS1 is preferentially processed, the FPGA module determines whether to send a first transport stream TS1 to the main control CPU module according to a transport stream type PID1 in the first transport stream TS 1; if the second transport stream TS2 is processed preferentially, the FPGA module determines whether to send the second transport stream TS2 to the main control CPU module according to the transport stream type PID2 in the second transport stream TS 2.
When the priority setting in the FPGA module is changed, the FPGA module immediately switches the TS message to be processed in a hot mode, and the first transport stream TS1 is switched into the second transport stream TS2 or the second transport stream TS2 is switched into the first transport stream TS 1.
The FPGA module determines whether to send the first transport stream TS1 to the main control CPU module according to the transport stream type PID1 in the first transport stream TS1 specifically is: if the transport stream type PID1 in the first transport stream TS1 is equal to the transport stream type setting value PID, the first transport stream TS1 is sent to the main control CPU module; the FPGA module determines whether to send the second transport stream TS2 to the main control CPU module according to the transport stream type PID2 in the second transport stream TS2 specifically is: if the transport stream type PID2 of the second transport stream TS2 is equal to the transport stream type set value PID, the second transport stream TS2 is sent to the main control CPU module.
The main control CPU module obtains and outputs audio signals to the audio DAC, the power amplifier and the loudspeaker by analyzing the first transmission stream TS1 or the second transmission stream TS 2.

Claims (7)

1. A system for simultaneously receiving DVB-C, DTMB signals using an FPGA, comprising: a first tuner 1, the first tuner 1 being configured to receive DVB-C signals and output first intermediate frequency signals to a first demodulator DEMO1, a second tuner 2, the second tuner 2 being configured to receive DTMB signals and output second intermediate frequency signals to a second demodulator DEMO 2;
the first demodulator DEMO1 outputs a first transport stream TS1 to the FPGA module, and the second demodulator DEMO2 outputs a second transport stream TS2 to the FPGA module;
the FPGA module firstly processes a first transport stream TS1 or a second transport stream TS2 according to priority setting, and if the first transport stream TS1 is preferentially processed, the FPGA module determines whether to send a first transport stream TS1 to the main control CPU module according to a transport stream type PID1 in the first transport stream TS 1; if the second transport stream TS2 is preferentially processed, the FPGA module determines whether to send the second transport stream TS2 to the main control CPU module according to the transport stream type PID2 in the second transport stream TS 2;
the main control CPU module obtains and outputs audio signals to the audio DAC, the power amplifier and the loudspeaker by analyzing the first transmission stream TS1 or the second transmission stream TS 2.
2. The system for simultaneously receiving DVB-C, DTMB signals according to claim 1, wherein the FPGA is configured to: the priority setting in the FPGA module is specifically as follows: when the FPGA module receives the first transport stream TS1 and the second transport stream TS2 at the same time, if the priority of the DVB-C signal is set to be high, the FPGA module processes the first transport stream TS1 first, and if the priority of the DTMB signal is set to be high, the FPGA module processes the second transport stream TS2 first.
3. The system for simultaneously receiving DVB-C, DTMB signals according to claim 1, wherein the FPGA is configured to: the FPGA module determines whether to send the first transport stream TS1 to the main control CPU module according to the transport stream type PID1 in the first transport stream TS1 specifically is: if the transport stream type PID1 in the first transport stream TS1 is equal to the transport stream type setting value PID in the FPGA module, the first transport stream TS1 is sent to the main control CPU module; the FPGA module determines whether to send the second transport stream TS2 to the main control CPU module according to the transport stream type PID2 in the second transport stream TS2 specifically is: and if the transport stream type number PID2 in the second transport stream TS2 is equal to the transport stream type number setting value PID in the FPGA module, sending the second transport stream TS2 to the main control CPU module.
4. The system for simultaneously receiving DVB-C, DTMB signals according to claim 3, wherein the FPGA is further configured to: when the FPGA module processes the first transport stream TS1, if the first transport stream TS1 is an on-air message and an off-air message, the FPGA module sends the on-air message and the off-air message to the CPU module; when the FPGA module processes the second transport stream TS2, if the second transport stream TS2 is a broadcast message and an off-air message, the FPGA module sends the broadcast message and the off-air message to the CPU module; the main control CPU module obtains a program number by analyzing the broadcast message and sets a transmission stream type number setting value PID in the FPGA module as the program number; and when the main control CPU module receives the off-air message, clearing the PID of the set value of the transmission stream type number in the FPGA module.
5. The system for simultaneously receiving DVB-C, DTMB signals according to claim 1, wherein the FPGA is configured to: the FPGA module communicates with a first tuner TUNNER1, a second tuner TUNNER2, a first demodulator DEMO1, a second demodulator DEMO2 over an I2C bus.
6. The system for simultaneously receiving DVB-C, DTMB signals according to claim 1, wherein the FPGA is configured to: the FPGA module is communicated with the main control CPU module through an SPI bus.
7. The system for simultaneously receiving DVB-C, DTMB signals according to claim 1, wherein the FPGA is configured to: after the FPGA module is powered on, the main control CPU module carries out frequency locking operation on the FPGA module.
CN202011228270.XA 2020-11-06 2020-11-06 System for simultaneously receiving DVB-C, DTMB signals by utilizing FPGA Pending CN112291489A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011228270.XA CN112291489A (en) 2020-11-06 2020-11-06 System for simultaneously receiving DVB-C, DTMB signals by utilizing FPGA

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011228270.XA CN112291489A (en) 2020-11-06 2020-11-06 System for simultaneously receiving DVB-C, DTMB signals by utilizing FPGA

Publications (1)

Publication Number Publication Date
CN112291489A true CN112291489A (en) 2021-01-29

Family

ID=74352250

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011228270.XA Pending CN112291489A (en) 2020-11-06 2020-11-06 System for simultaneously receiving DVB-C, DTMB signals by utilizing FPGA

Country Status (1)

Country Link
CN (1) CN112291489A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205883470U (en) * 2016-08-05 2017-01-11 广西广播电视技术中心 Multichannel urgent broadcasting adapter
CN108965953A (en) * 2017-12-29 2018-12-07 深圳佳力拓科技有限公司 It is a kind of to receive DVB-C and DTMB simple two-way signal set-top-box system and method simultaneously
CN208424381U (en) * 2018-06-27 2019-01-22 常州嘉昊广播电视设备有限公司 A kind of emergent broadcast adapter based on multi-internet integration
US20190174204A1 (en) * 2016-08-12 2019-06-06 Sharp Kabushiki Kaisha Systems and methods for signaling of emergency alert messages

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205883470U (en) * 2016-08-05 2017-01-11 广西广播电视技术中心 Multichannel urgent broadcasting adapter
US20190174204A1 (en) * 2016-08-12 2019-06-06 Sharp Kabushiki Kaisha Systems and methods for signaling of emergency alert messages
CN108965953A (en) * 2017-12-29 2018-12-07 深圳佳力拓科技有限公司 It is a kind of to receive DVB-C and DTMB simple two-way signal set-top-box system and method simultaneously
CN208424381U (en) * 2018-06-27 2019-01-22 常州嘉昊广播电视设备有限公司 A kind of emergent broadcast adapter based on multi-internet integration

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
唐丽: "应急广播接收终端的设计与实现", 《视听》 *

Similar Documents

Publication Publication Date Title
CN101237291B (en) Mdu broadcasting signal distribution system
CN112291489A (en) System for simultaneously receiving DVB-C, DTMB signals by utilizing FPGA
ATE458317T1 (en) TERRESTRIAL REPEATER WITH MULTIPLE INPUTS FOR A CONTENT BROADCASTING SYSTEM
CN201282520Y (en) Tuner for digital satellite television set-top box
CN114205026A (en) Awakenable dual-mode FM-CDR emergency broadcast message receiving method
CN114205041A (en) Multimode emergency broadcast adapter comprising FM-CDR
CN201717999U (en) Cable digital TV monitoring system
CN114205037A (en) Emergency broadcast adapter for converting FM-CDR into multimode output
CN207200876U (en) Multinuclear video capture device
CN114221728A (en) Emergency broadcast adapter for converting FM-CDR into DTMB
CN205986835U (en) Self -adaptation multiple source three routes frequency modulation emission machine
CN202455465U (en) Broadcast television monitoring system
CN109525341A (en) There is the emergency broadcase system of terminal monitoring function when a kind of teletext
KR102573882B1 (en) Apparatus and method for digital channel filtering of emergency broadcast repeater
CN212231466U (en) Broadcast terminal and system based on multi-network convergence media
CN114205039A (en) Frequency self-adaptive dual-mode FM-CDR emergency broadcast message receiving method
CN114205043A (en) Dual-mode FM-CDR emergency broadcast message receiving method for clear buffer area
KR102245430B1 (en) Method of watching multiple broadcasts simultaneously using a single ATSC receiver
CN214851250U (en) Novel video output emergency broadcast adapter
CN210491086U (en) Multichannel broadcast television signal monitoring decoding equipment
CN202565257U (en) Multichannel intelligent radio signal receiver
CN114205033A (en) Time-preset dual-mode FM-CDR emergency broadcast message receiving method
CN114205028A (en) Frequency self-adaptive FM-CDR emergency broadcast message receiving method
CN114205030A (en) Emergency broadcast adapter for converting FM-CDR (frequency modulation-digital radio frequency identification) into FM-RDS (radio data service)
CN107564256B (en) Vehicle-mounted sound RDS system and software monitoring method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20210129

RJ01 Rejection of invention patent application after publication