CN202587251U

CN202587251U - Bidirectional interactive network high definition television set-top box

Info

Publication number: CN202587251U
Application number: CN 201220056211
Authority: CN
Inventors: 毛振刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-21
Filing date: 2012-02-21
Publication date: 2012-12-05
Anticipated expiration: 2022-02-21

Abstract

The utility model relates to a bidirectional interactive network high definition television set-top box which is mainly technically characterized in that the bidirectional interactive network high definition television set-top box comprises a digital television and broadcasting receiving front-end, a MPEG decoding module, an audio, video and graph processing module, a cable modem, an embedded microprocessor, a condition receiving module, a memory, a panel control module, a switch power supply module, an intelligent card interface circuit, a feedback communication interface and a peripheral interface circuit; the digital television and broadcasting receiving front-end, the condition receiving module, the MPEG decoding module, the audio, video and graph processing module, the cable modem and the embedded microprocessor are orderly connected; the memory and the panel control module are respectively connected with the embedded microprocessor; and the switch power supply module provides power for each module. According to the utility model, an analog television converts from a passive receiving analog television to an interactive digital television and can access the Internet, which enables a user to enjoy the comprehensive information service of television, data, language and the like.

Description

Two-way interactive type network HDTV STB

Technical field

The utility model belongs to DTV STB, especially a kind of two-way interactive type network HDTV STB.

Background technology

The high speed development of science and technology makes radio and television enter Chinese Government and plans to break simulated television later in 2015, has gone into the DTV epoch, and STB has wide development space as the significant product of DTV.National digital TV receiving apparatus and performance standard are formulated the definition of working group to digital TV in high resolution: radio frequency, the vertical resolution that can receive the ground acceptance criteria is not less than 720 tv lines, national form is that 1920 * 1080i, the ratio of width to height are 16:9, backward compatible Standard Definition Television, and the broadcast of a series of TV signals such as its shooting, editor, making, broadcast, transmission, reception and reception overall process are all used digital technology.

Digital high-definition television is five-star a kind of in DTV (DTV) standard, abbreviates HDTV as.It is the TV that the horizontal sweep line number is at least the high-res of 720 row, and the widescreen pattern is 16:9, and adopts multichannel to transmit.

The die is cast for the digital development of whole world television broadcasting; Simulated television is replaced by digital television the most at last; But see from China's actual conditions, have the simulation color television set about 300,000,000 in the common people family at present, progressively realizing from analog television broadcast to the process of digital television broadcasting transition; These simulation color television sets can not be eliminated immediately; Even in the U.S. or developed regions, West Europe also is so, analog TV broadcasting is turned round digital broadcast television need experience long transition period, and DTV STB is the best solution of this transition period; Top box of digital machine is combined with general television set, just can constitute a complete digital television.

DTV has two main developing direction: on the one hand, the image of high definition is the desirable TV picture effect that people pursue, so digital high-definition television is one of developing goal of DTV; The service function that multiple innovation is provided in digital television system on the other hand also is an important developing direction.Thereby the development of top box of digital machine technology also can be advanced towards this both direction, and high-quality picture can be provided, and again innovation service can be provided.

At present, the STB that is used for acceptance criteria definition DTV has developed comparatively ripely, and its application is also commonplace, especially digital satellite television STB.Digital TV set-top-box system for single-definition; Had than total solution; As for the digital high-definition television STB, the maturity of its development is far away less than the single-definition digital television STB, and this release time with the digital HDTV video decoding chip is not long relevant; We can say that the research of digital high-definition television STB also is in very unripe stage.

Continuous increase along with digital service kind in the develop rapidly of Internet and the digital television broadcasting; Single-definition and high definition digital television STB all are faced with such problem; Exactly about the exploitation of STB that the multiple business function can be provided, data, services, interactive service and network browsing etc.

Summary of the invention

The purpose of the utility model is to overcome the deficiency of prior art; Realized that numeral is integrated with the simulated television reception, cable digital TV receives and show integrated; Make simulated television turn to interactive digital TV from passive reception simulated television; And can enter the Internet, make the user enjoy omnibearing information services such as TV, data, language.

The utility model solves its technical problem and takes following technical scheme to realize:

Constitute by digital television broadcasting receiving front-end, mpeg decode module, audio frequency and video and pattern process module, cable modem, embedded microprocessor, Conditional Access Module, memory, panel control module, switch power module, intelligent card interface circuit, communicate back interface and peripheral interface circuit; Digital television broadcasting receiving front-end, Conditional Access Module, mpeg decode module, audio frequency and video and pattern process module, cable modem, embedded microprocessor link to each other successively; Memory, panel control module are connected with embedded microprocessor respectively, and switch power module is given each module for power supply.

And described digital television broadcasting receiving front-end comprises tuner and qam demodulator.

And described cable modem is made up of a two-way tuner, descending qam demodulator, up QPSK/QAM modulator and media interviews control module.

And described mpeg decode partly comprises demultiplexing module, scramble process module and AV signal decompression module, comprises a descrambling engine that can carry out descrambling in the data of transport stream layer and the scrambling of PES layer in the demultiplexing module.

And; Described embedded microprocessor adopts the BCM7405 chip; The USB module of BCM7405 comprises two master controllers, a device controller, and peripheral interface circuit is equipped with two USB2. 0 host device interface, can expand a USB2. 0/1. 1 slave unit interface; BCM7405 is integrated two 10/100 M ethernet macs independently; One of them directly is connected to inner ethernet transceiver through the MII interface, and the LAN8710 of the SMSC company of another employing is as the Ethernet transducer, and external CableModem module realizes real two-way interactive function.

And described intelligent card interface circuit adopts special-purpose intelligent card interface chip ST8024.

And the single 12 V power supplys of described switch power module output are through DCDC conversion output 1. 2 V, 1. 8 V, 2. 5 V, 3. 3 V and 5 V voltages; Supply with different module respectively; Wherein 3. 3 V mainly give the power supply of I/O equipment and demodulation chip, and 1. 2V is the micro-processor kernel power supply, and 1.8 V are the DDR module for power supply; 2. 5 V are the interface module power supply of peripheral hardware, and 5 V mainly give Tuner, peripheral drive circuit and USB device power supply.

And described panel control module adopts the LED drive controlling special circuit CT1668 of band keyboard scan interface.

The advantage and the good effect of the utility model are:

1, the utility model is realized high/standard definition MPEG-2, the decoding of H. 264 video/audios simultaneously on hardware platform; Can realize that various two-way interactives are professional through Ethernet; Make the user when watching the High-Quality Digital Television program, enjoy more value-added services of upgrading more; Cooperate the input/output interface of the peripheral digital audio/video that enriches, accomplish the transmission of audio, video data in high quality.

2, the utility model is realized the internet access function easily through built-in cable modem; The user can be through the built-in browser online of STB; Send Email also can provide various interface to link to each other with PC simultaneously, surfs the Net with PC; Use the speed of cable modem to compare, improved 100 times with telephone modem.

3, the utility model utilizes interactively data channel and broadcast channel, for each user provides video on-demand function, lets the user see that he wants the program of seeing at his desirable when and where, and can realize VCR operations such as F.F., rewind down, time-out recovery.

4, the utility model compact conformation, integrated level are high, performance is strong, peripheral interface is abundant, can handle the video/audio data of multiple form, satisfy the demand for development of high definition epoch digital TV in high resolution fully.

Description of drawings

Fig. 1 is that the system of the utility model connects block diagram.

Embodiment

Below in conjunction with accompanying drawing the utility model embodiment is done further detailed description:

As shown in Figure 1; The described a kind of two-way interactive type network HDTV STB of the utility model; Constitute by digital television broadcasting receiving front-end, mpeg decode module, audio frequency and video and pattern process module, cable modem, embedded microprocessor, Conditional Access Module, memory, panel control module, switch power module, intelligent card interface circuit, communicate back interface and peripheral interface circuit; Digital television broadcasting receiving front-end, Conditional Access Module, mpeg decode module, audio frequency and video and pattern process module, cable modem, embedded microprocessor link to each other successively; Memory, panel control module are connected with embedded microprocessor respectively, and switch power module is given each module for power supply.

The structure and the operation principle of the utility model are as shown in Figure 1, and the digital television broadcasting receiving front-end comprises tuner and qam demodulator, and this part can demodulate mpeg transport stream from radiofrequency signal; Mpeg decode partly comprises demultiplexing module, scramble process module and AV signal decompression module; It is output as MPEG and looks audio frequency and flow basically and payload user data, comprises a descrambling engine that can carry out descrambling in the data of transport stream layer and the scrambling of PES layer in the demultiplexing module; Look audio frequency and graphics process and partly accomplish analog encoding and the graphics processing function of looking audio frequency; Cable modem is made up of a two-way tuner, descending qam demodulator, up QPSK/QAM modulator and media interviews control (MAC) module, and this part realizes all functions of cable modem; Embedded microprocessor and memory module are used for storing and the operating software system, and each module is controlled; Peripheral interface circuit then provides abundant external interface, comprises USB USB, HSSI High-Speed Serial Interface 1394, Ethernet interface, RS232, looks COBBAIF etc.

Digital television broadcasting receiving front-end received RF signal also down-converts to intermediate-freuqncy signal; Carry out the A/D conversion then and become digital signal, send into the QAM demodulation module again and carry out the QAM demodulation, output mpeg transport stream serial or parallel data; Demultiplexing module receives the MPEG MPTS; Therefrom extract the PES data of a program out, comprise video PES, audio frequency PES and data PES, comprise a descrambling engine in the demultiplexing module; Can carry out descrambling to the data of scrambling in transport stream layer and PES layer, its output is the PES of descrambling; Video PES sends into the video decode module, takes out the MPEG video data, and the MEPG video data is decoded, and outputs to the PAL/NTSC encoder then, is encoded into anolog TV signals, exports through video output circuit again; Audio frequency PES sends into the audio decoder module, takes out the mpeg audio data, and the mpeg audio data are decoded, and output pcm audio data are to PCM decoder, and PCM decoder is exported stereo simulated audio signal, exports through audio output circuit.

It is emphasized that; The described embodiment of the utility model is illustrative; Rather than it is determinate; Therefore the utility model is not limited to the embodiment described in the embodiment, every by those skilled in the art according to other execution modes that the technical scheme of the utility model draws, belong to the scope of the utility model protection equally.

Claims

1. two-way interactive type network HDTV STB; It is characterized in that: constitute by digital television broadcasting receiving front-end, mpeg decode module, audio frequency and video and pattern process module, cable modem, embedded microprocessor, Conditional Access Module, memory, panel control module, switch power module, intelligent card interface circuit, communicate back interface and peripheral interface circuit; Digital television broadcasting receiving front-end, Conditional Access Module, mpeg decode module, audio frequency and video and pattern process module, cable modem, embedded microprocessor link to each other successively; Memory, panel control module are connected with high-performance embedded microprocessor respectively, and switch power module is given each module for power supply.

2. two-way interactive type network HDTV STB according to claim 1, it is characterized in that: described digital television broadcasting receiving front-end comprises tuner and qam demodulator.

3. two-way interactive type network HDTV STB according to claim 1, it is characterized in that: described cable modem is made up of a two-way tuner, descending qam demodulator, up QPSK/QAM modulator and media interviews control module.

4. two-way interactive type network HDTV STB according to claim 1; It is characterized in that: described mpeg decode partly comprises demultiplexing module, scramble process module and AV signal decompression module, comprises a descrambling engine that can carry out descrambling in the data of transport stream layer and the scrambling of PES layer in the demultiplexing module.

5. two-way interactive type network HDTV STB according to claim 1; It is characterized in that: described embedded microprocessor adopts the BCM7405 chip; The USB module of BCM7405 comprises two master controllers, a device controller, and peripheral interface circuit is equipped with two USB2. 0 host device interface, can expand a USB2. 0/1. 1 slave unit interface; BCM7405 is integrated two 10/100 M ethernet macs independently; One of them directly is connected to inner ethernet transceiver through the MII interface, and the LAN8710 of the SMSC company of another employing is as the Ethernet transducer, and external CableModem module realizes real two-way interactive function.

6. two-way interactive type network HDTV STB according to claim 1 is characterized in that: described intelligent card interface circuit adopts special-purpose intelligent card interface chip ST8024.

7. two-way interactive type network HDTV STB according to claim 1; It is characterized in that: the single 12 V power supplys of described switch power module output; Through DCDC conversion output 1. 2 V, 1. 8 V, 2. 5 V, 3. 3 V and 5 V voltages, supply with different module respectively, wherein 3. 3 V mainly give the power supply of I/O equipment and demodulation chip; 1. 2V is the micro-processor kernel power supply; 1.8 V is the DDR module for power supply, 2. 5 V are the interface module power supply of peripheral hardware, and 5 V mainly give Tuner, peripheral drive circuit and USB device power supply.

8. two-way interactive type network HDTV STB according to claim 1 is characterized in that: described panel control module adopts the LED drive controlling special circuit CT1668 of band keyboard scan interface.