CN204334857U - The digital TV set-top box of a kind of compatible with DVB-C, DTMB-TH transmission medium - Google Patents
The digital TV set-top box of a kind of compatible with DVB-C, DTMB-TH transmission medium Download PDFInfo
- Publication number
- CN204334857U CN204334857U CN201520071029.9U CN201520071029U CN204334857U CN 204334857 U CN204334857 U CN 204334857U CN 201520071029 U CN201520071029 U CN 201520071029U CN 204334857 U CN204334857 U CN 204334857U
- Authority
- CN
- China
- Prior art keywords
- chip
- module
- connects
- demodulation
- port
- 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.)
- Expired - Fee Related
Links
Landscapes
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The utility model discloses a kind of compatible with DVB-C, the digital TV set-top box of DTMB-TH transmission medium, it comprises Network Interface Module (1), memory module (2), memory mould interface circuit (3), Network Interface Module (1), memory module (2), memory mould interface circuit (3) all connects master chip (4), it is characterized in that described Network Interface Module (1) comprises radiofrequency signal tuner (1-1), QAM demodulation chip (1-2), OFDM demodulation chip (1-3), radiofrequency signal tuner (1-1) connects QAM demodulation chip (1-2) respectively, OFDM demodulation chip (1-3), master chip (4), QAM demodulation module (1-2), OFDM demodulation module (1-3) all connects master chip (4), the utility model has had both the decoding capability of DVB-C and DTMB-TH two kinds of transmission medium signals simultaneously, improve the adaptability to signal source, more practical, use convenient.
Description
Technical field:
The utility model belongs to apparatus of digital television receiving technical field, specifically, relate to a kind of can the digital TV set-top box of simultaneously compatible with DVB-C, DTMB-TH two kinds of transmission mediums.
Background technology:
Digital TV set-top box can be divided into satellite digital television receiver set top box (DVB-S), cable digital TV set-top box (DVB-C), terrestrial wireless digital TV set-top box (DTMB-TH) according to the difference of transmission medium, DTMB-TH standard is the transmission standard that China has the terrestrial wireless Digital Television of complete independent intellectual property right, there is the operator scheme of high flexible, by selecting different modulation systems and address information, support fixing, portable, mobile reception.The pressure standard of Chinese broadcast service terrestrial television signal is become from this standard in 2007, terrestrial wireless digital television business starts fast development, current most cities has released one after another free terrestrial DTV program, but most of digital TV set-top box all only supports DVB-C standard, the reception to DTMB-TH standard signal cannot be realized, user will receive terrestrial DTV program to be only had and buys Set Top Box in addition, not only causes waste to use but also very inconvenient.
Utility model content:
The purpose of this utility model is to overcome the deficiency of above-mentioned prior art and provides a kind of channel demodulation part to have both the demodulation ability of DVB-C and DTMB-TH two kinds of transmission medium signals simultaneously, source coding part is supported multiplely to look comprehensively, audio coding formats, more comprehensive to the adaptability of signal source, more practical, the digital TV set-top box of compatible with DVB-C easy to use, DTMB-TH two kinds of transmission mediums.
The purpose of this utility model can be reached by following measure: a kind of compatible with DVB-C, the digital TV set-top box of DTMB-TH transmission medium, it comprises Network Interface Module, memory module, memory mould interface circuit, Network Interface Module, memory module, memory mould interface circuit all connects master chip, it is characterized in that described Network Interface Module comprises radiofrequency signal tuner, QAM demodulation chip, OFDM demodulation chip, radiofrequency signal tuner connects QAM demodulation chip respectively, OFDM demodulation chip, master chip, QAM demodulation module, OFDM demodulation module all connects master chip, radiofrequency signal tuner is provided with radio-frequency (RF) signal input end mouth RF Input, radio frequency ring outgoing interface LT_ OUT, the input interface RESET_N of reset signal, crystal clock signal output interface CLK_OUT, IC bus port, intermediate-freuqncy signal output port IF_OUTP and IF_OUTN, automatic growth control input port AGC, the input interface RESET_N of reset signal is connected with master chip, crystal clock signal output interface CLK_OUT connects the crystal clock input port CLK_IN of QAM demodulation chip and the crystal clock input port CLK_IN of OFDM demodulation chip respectively, the IC bus port of radiofrequency signal tuner connects the IC bus port of QAM demodulation chip respectively, the IC bus port of OFDM demodulation chip, the IC bus port of master chip, intermediate-freuqncy signal output port IF_OUTP with IF_OUTN of radiofrequency signal tuner is connected signal input end of intermediate frequency mouth IF_INP and IF_INN of QAM demodulation chip and signal input end of intermediate frequency mouth IF_INP and IF_INN of OFDM demodulation chip respectively, the automatic growth control input port AGC of radiofrequency signal tuner connects the automatic growth control output port AGC of QAM demodulation chip and the automatic growth control output port AGC of OFDM demodulation chip respectively.
In order to realize the purpose of this utility model further, described master chip comprises embedded type CPU, information source data transmission stream demodulation multiplexer, condition reception processing module, Video Decoder, audio decoder, video post-processor, audio post-processor, Network Interface Module connects information source data transmission stream demodulation multiplexer, information source data transmission stream demodulation multiplexer condition of contact receiving processing module, condition reception processing module connects Video Decoder respectively, audio decoder, Video Decoder connects video post-processor, audio decoder connects audio post-processor, Network Interface Module, information source data transmission stream demodulation multiplexer, condition reception processing module, Video Decoder, audio decoder, video post-processor, audio post-processor is all connected with embedded type CPU, embedded type CPU connected storage module and interface circuit.
The utility model can produce following good effect compared with the prior art: Network Interface Module of the present utility model has had both the demodulation ability of DVB-C and DTMB-TH two kinds of transmission medium signals simultaneously, the MPEG/H.264 video format that the video and audio decoder module be integrated in master chip is conventional under both having supported DVB-C standard, support again the AVS/AVS+ form of DTMB-TH standard common, support depending on, audio coding formats multiple comprehensively, improve the adaptability to signal source, more practical, can not waste be caused, easy to use.
Accompanying drawing illustrates:
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is the structured flowchart of Network Interface Module part of the present utility model.
Embodiment: embodiment of the present utility model is elaborated below in conjunction with accompanying drawing:
Embodiment: the digital TV set-top box (see Fig. 1) of a kind of compatible with DVB-C, DTMB-TH transmission medium, it comprises Network Interface Module 1, memory module 2, memory mould interface circuit 3, master chip 4, embedded type CPU 4-7, information source data transmission stream demodulation multiplexer 4-1, condition reception processing module 4-2, Video Decoder 4-3, audio decoder 4-4, video post-processor 4-5, audio post-processor 4-6 are all integrated in a master chip 4, form the chip solution of integration, significantly reduce device cost and improve reliability.Network Interface Module 1 connects information source data transmission stream demodulation multiplexer 4-1, information source data transmission stream demodulation multiplexer 4-1 condition of contact receiving processing module 4-2, condition reception processing module 4-2 connects Video Decoder 4-3 respectively, audio decoder 4-4, Video Decoder 4-3 connects video post-processor 4-5, audio decoder 4-4 connects audio post-processor 4-6, Network Interface Module 1, information source data transmission stream demodulation multiplexer 4-1, condition reception processing module 4-2, Video Decoder 4-3, audio decoder 4-4, video post-processor 4-5, audio post-processor 4-6 is all connected with embedded type CPU 4-7, embedded type CPU 4-7 connected storage module 2 and interface circuit 3.Network Interface Module 1 completes channel demodulation and channel-decoding function, and output packet is containing the TS transport stream of video and audio with other data messages.
The utility model carries out improving on the basis of existing digital TV set-top box, it mainly improves the Network Interface Module part of digital TV set-top box, other parts are identical with existing digital TV set-top box, and Network Interface Module 1(is see Fig. 2) be made up of radiofrequency signal tuner 1-1, QAM demodulation chip 1-2, OFDM demodulation chip 1-3.Radiofrequency signal tuner 1-1 connects QAM demodulation chip 1-2, OFDM demodulation chip 1-3 respectively, master chip 4, QAM demodulation module 1-2, OFDM demodulation module 1-3 all connect master chip 4.
Radiofrequency signal tuner 1-1 is provided with radio-frequency (RF) signal input end mouth RF Input, radio frequency ring outgoing interface LT_ OUT, the input interface RESET_N of reset signal, crystal clock signal output interface CLK_OUT, I
2c bus port, intermediate-freuqncy signal output port IF_OUTP, IF_OUTN, automatic growth control input port AGC.Radio-frequency signal source is linked into the radio-frequency (RF) signal input end mouth RF Input of radiofrequency signal tuner 1-1, and radio frequency ring outgoing interface LT_ OUT outputs to other demodulated equipments by logical for input radio frequency hoop.The input interface RESET_N of reset signal is connected with master chip 4, for receiving the reset signal that master chip 4 exports.Crystal clock signal output interface CLK_OUT connects the crystal clock input port CLK_IN of QAM demodulation chip 1-2 and the crystal clock input port CLK_IN of OFDM demodulation chip 1-3 respectively, realizes the clock synchronous between radiofrequency signal tuner 1-1 and QAM demodulation chip 1-2, OFDM demodulation chip 1-3.The I of radiofrequency signal tuner 1-1
2c bus port connects the I of QAM demodulation chip 1-2 respectively
2the I of C bus port, OFDM demodulation chip 1-3
2the I of C bus port, master chip 4
2c bus port.Intermediate-freuqncy signal output port IF_OUTP with IF_OUTN of radiofrequency signal tuner 1-1 is connected signal input end of intermediate frequency mouth IF_INP and IF_INN of QAM demodulation chip 1-2 and signal input end of intermediate frequency mouth IF_INP and IF_INN of OFDM demodulation chip 1-3 respectively.The automatic growth control input port AGC of radiofrequency signal tuner 1-1 connects the automatic growth control output port AGC of QAM demodulation chip 1-2 and the automatic growth control output port AGC of OFDM demodulation chip 1-3 respectively, form feedback network, realize automatic growth control.
Operation principle of the present utility model is as follows:
DVB-C digital catv signal and the wireless ground digital television signal of the DTMB-TH rf input port RF INPUT from Set Top Box tuner after frequency mixer mixes inputs, and tuner passes through I
2the frequency of C bus marco phase-locked loop, be tuned to certain cable digital TV channel, then low noise amplification, filtering and frequency conversion is carried out, high-frequency signal is converted to corresponding modulated intermediate frequency signal, through intermediate-freuqncy signal output port IF_OUTP, IF_OUTN, modulated intermediate frequency signal is delivered to signal input end of intermediate frequency mouth IF_INP, IF_INN of corresponding demodulation chip, carry out corresponding demodulation by QAM or OFDM demodulation chip, deinterleave, a series of process such as decoding obtain TS data flow, then with parallel or serial mode, TS stream is delivered to master chip.Generally comprise multiple audio/video flow and some data messages in TS data flow, the information source data transmission stream demodulation multiplexer of master chip distinguishes different programs, extracts corresponding audio/video flow and data flow, sends into video-audio decoder.For scrambled signals, the condition reception processing module of master chip carries out descrambling to audio/video flow, signal feeding video-audio decoder after descrambling and video and audio preprocessor complete the decompression to audio-video signal, after carrying out D/A digital to analog conversion, restore analog audio-video signal.Memory module has coordinated data to store and operating software system with the CPU of master chip, and controls each hardware module.
Claims (2)
1. a compatible with DVB-C, the digital TV set-top box of DTMB-TH transmission medium, it comprises Network Interface Module (1), memory module (2), memory mould interface circuit (3), Network Interface Module (1), memory module (2), memory mould interface circuit (3) all connects master chip (4), it is characterized in that described Network Interface Module (1) comprises radiofrequency signal tuner (1-1), QAM demodulation chip (1-2), OFDM demodulation chip (1-3), radiofrequency signal tuner (1-1) connects QAM demodulation chip (1-2) respectively, OFDM demodulation chip (1-3), master chip (4), QAM demodulation module (1-2), OFDM demodulation module (1-3) all connects master chip (4), radiofrequency signal tuner (1-1) is provided with radio-frequency (RF) signal input end mouth RF Input, radio frequency ring outgoing interface LT_ OUT, the input interface RESET_N of reset signal, crystal clock signal output interface CLK_OUT, I
2c bus port, intermediate-freuqncy signal output port IF_OUTP and IF_OUTN, automatic growth control input port AGC, the input interface RESET_N of reset signal is connected with master chip (4), crystal clock signal output interface CLK_OUT connects the crystal clock input port CLK_IN of QAM demodulation chip (1-2) and the crystal clock input port CLK_IN of OFDM demodulation chip (1-3), the I of radiofrequency signal tuner (1-1) respectively
2c bus port connects the I of QAM demodulation chip (1-2) respectively
2the I of C bus port, OFDM demodulation chip (1-3)
2the I of C bus port, master chip (4)
2c bus port, intermediate-freuqncy signal output port IF_OUTP with IF_OUTN of radiofrequency signal tuner (1-1) is connected signal input end of intermediate frequency mouth IF_INP and IF_INN of QAM demodulation chip (1-2) and signal input end of intermediate frequency mouth IF_INP and IF_INN of OFDM demodulation chip (1-3) respectively, and the automatic growth control input port AGC of radiofrequency signal tuner (1-1) connects the automatic growth control output port AGC of QAM demodulation chip (1-2) and the automatic growth control output port AGC of OFDM demodulation chip (1-3) respectively.
2. a kind of compatible with DVB-C according to claim 1, the digital TV set-top box of DTMB-TH transmission medium, is characterized in that described master chip (4) comprises embedded type CPU (4-7), information source data transmission stream demodulation multiplexer (4-1), condition reception processing module (4-2), Video Decoder (4-3), audio decoder (4-4), video post-processor (4-5), audio post-processor (4-6), Network Interface Module (1) connects information source data transmission stream demodulation multiplexer (4-1), information source data transmission stream demodulation multiplexer (4-1) condition of contact receiving processing module (4-2), condition reception processing module (4-2) connects Video Decoder (4-3) respectively, audio decoder (4-4), Video Decoder (4-3) connects video post-processor (4-5), and audio decoder (4-4) connects audio post-processor (4-6), Network Interface Module (1), information source data transmission stream demodulation multiplexer (4-1), condition reception processing module (4-2), Video Decoder (4-3), audio decoder (4-4), video post-processor (4-5), audio post-processor (4-6) is all connected with embedded type CPU (4-7), embedded type CPU (4-7) connected storage module (2) and interface circuit (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520071029.9U CN204334857U (en) | 2015-02-02 | 2015-02-02 | The digital TV set-top box of a kind of compatible with DVB-C, DTMB-TH transmission medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520071029.9U CN204334857U (en) | 2015-02-02 | 2015-02-02 | The digital TV set-top box of a kind of compatible with DVB-C, DTMB-TH transmission medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204334857U true CN204334857U (en) | 2015-05-13 |
Family
ID=53171161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520071029.9U Expired - Fee Related CN204334857U (en) | 2015-02-02 | 2015-02-02 | The digital TV set-top box of a kind of compatible with DVB-C, DTMB-TH transmission medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204334857U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967890A (en) * | 2015-08-05 | 2015-10-07 | 张峰 | Intelligent flat digital mobile television |
| 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 |
| CN113329248A (en) * | 2021-05-14 | 2021-08-31 | 深圳佳力拓科技有限公司 | Digital television set-top box supporting multiple tuning modes and method for automatically adapting to multiple tuning modes |
-
2015
- 2015-02-02 CN CN201520071029.9U patent/CN204334857U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967890A (en) * | 2015-08-05 | 2015-10-07 | 张峰 | Intelligent flat digital mobile television |
| 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 |
| CN113329248A (en) * | 2021-05-14 | 2021-08-31 | 深圳佳力拓科技有限公司 | Digital television set-top box supporting multiple tuning modes and method for automatically adapting to multiple tuning modes |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20040244059A1 (en) | Digital set-top box transmodulator | |
| CN101729757B (en) | Wireless terminal and method for realizing audio and video signal forwarding | |
| CN204334857U (en) | The digital TV set-top box of a kind of compatible with DVB-C, DTMB-TH transmission medium | |
| CN102088632A (en) | Condition receiving apparatus capable of supporting two program sources and implementation method thereof | |
| US20120026407A1 (en) | System and Method for Configurable Multi-standard Receiver | |
| WO2015078416A1 (en) | Television signal receiving module and receiving method | |
| CN201282520Y (en) | Tuner for digital satellite television set-top box | |
| CN101588461A (en) | Commercial display ternimal integrated with CMMB receiving module | |
| EP2416566A2 (en) | Method for handling of audio/video signals and corresponding device | |
| CN102025944A (en) | Demodulator and mobile digital television information receiving device | |
| CN105072265A (en) | Mobile terminal with China digital radio broadcasting (CDR) receiving function | |
| US7861271B2 (en) | Baseband video signaling for set-top box local loop connection | |
| CN107317981B (en) | Channel receiving switching control device and method based on DVB-C and DTMB | |
| CN204887296U (en) | Cable television fuses STB with terrestrial digital TV and IPTV terminal | |
| CN101491088B (en) | High frequency signal receiving terminal and operating method thereof | |
| CN102780925A (en) | Digital video broadcasting player | |
| CN202095019U (en) | Digital terrestrial television receiving terminal device | |
| US20110149171A1 (en) | Efficient tuning and demodulation techniques | |
| CN203057372U (en) | Digital television receiving terminal | |
| CN207070198U (en) | A kind of channel based on DVB C and DTMB receives switching control | |
| CN101674396B (en) | Set top box with frequency modulation radio function and operation method thereof | |
| CN101146188A (en) | A multi-channel digital TV conditional receiving device | |
| CN204538242U (en) | A kind of digital terminal antenna box supporting multiple stage satellite television | |
| CN201248092Y (en) | Portable receiver for GB digital television | |
| CN202696815U (en) | Digital video broadcast player |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150513 Termination date: 20170202 |