CN2838172Y - USB interface based multi-functional digital television set-top box that can utilize wireless metropolitan area network - Google Patents

Abstract

A kind of digital TV multifunctional receiving box that can utilize wireless metropolitan area network based on USB interface, comprises: digital TV receiving module (1), mobile communication module (3), USB interface module (2) and driver P; USB interface module (2) is bidirectionally connected with digital TV receiving module (1) and mobile communication module (3) respectively, and described USB interface module (2) comprises USB interface control unit (21), digital TV TS flow interface control unit ( 22), mobile communication interface control unit (23) and user identification card connection convex unit (24); Described driver program P is installed in the computer (4) that has USB interface, and described USB interface control unit (21 ) is pluggably connected with a USB port of a computer (4) with a USB interface through a USB plug. After a common computer with a USB interface is inserted into the digital TV multifunctional USB receiving box of the utility model, it will become a digital TV receiving terminal with viewing authentication, billing and video-on-demand.

Description

Digital TV Multifunctional Receiver Box Based on USB Interface Utilizing Wireless Metropolitan Area Network

technical field

The utility model relates to parts of a digital TV receiving terminal, in particular to a terrestrial digital TV multifunctional receiving box which combines the communication function of a mobile phone and the broadband receiving function of a terrestrial digital TV. An ordinary computer with a USB interface is inserted into the utility model After the new multifunctional receiving box, it will become a portable terrestrial digital TV receiving terminal with transceiver function.

Background technique

Digital TV has flourished worldwide. China has also formulated the "Tenth Five-Year Plan" development plan, which requires that by 2005, radio and television stations above the provincial level will be digitalized, and that national radio and television will be basically networked; by 2010, national radio and television production and broadcasting will be basically realized. , digitalization of transmission, emission and reception; complete the transition from analog to digital by 2015. It is predicted that from 2004 to 2008, the scale of digital TV users in China will grow rapidly at a compound growth rate of 188.8%, and the total market size of digital TV terminals (including set-top boxes and digital TVs) in the next five years will reach 339.7 billion yuan.

At present, the transmission ways of digital TV can be divided into three types: digital satellite TV, digital cable TV and digital wireless (terrestrial) broadcast TV. Terrestrial digital TV (also known as wireless digital TV) has European standard DVB-T, American standard ATSC-T, etc. Tsinghua University has also proposed a terrestrial digital TV transmission scheme DMB-T ( Terrestrial Digital Multimedia-Television Broadcasting). Terrestrial digital TV reception is the same as cable digital TV (our country does not allow personal reception of satellite digital TV) in the following forms: (1) household digital TV receiver; (2) digital TV set-top box + household analog digital TV receiver ; (3) Digital TV receiving card + multimedia computer. Different from cable digital TV, terrestrial digital TV puts more emphasis on the mobile receiving function, so it will lead to a huge market for mobile TV receiving equipment. At present, vehicle-mounted mobile digital TVs have appeared, including automobiles, trains, subways, etc. unique territory. Mobile digital TV receivers will become emerging multimedia consumer products just like mobile phones and PDAs.

With the development of TV digitization, we already have three digital information transmission networks: radio and television network, computer network and telecommunication network. The three types of networks have their own characteristics and advantages, and they need complementary development to exert greater effectiveness.

At present, it is the introduction period of digital TV development, and many problems need to be solved, such as: producing TV content that attracts viewers, changing the free viewing habits of TV viewers, and establishing a digital TV charging platform, etc. Chinese TV viewers do not have the habit of paying to watch TV, and they have to rely on advertising revenue to make money when they start digital TV.

At present, we see that the mobile phone network in the telecommunication network has become the public network with the largest number of users, the widest coverage and the greatest influence. And establish a sound charging platform. my country's mobile communication network scale and number of users have ranked first in the world. A digital modern mobile communication network covering the whole country, connecting the world, advanced technology and diverse services has been basically formed, and mobile communication has become the first pillar of my country's telecommunications business. Mobile communication currently provides mobile value-added services other than voice communication services, including SMS, MMS, Internet services and other voice value-added services. The diversity of telecommunication network services has further made mobile phones a new generation of mobile information terminals after radios, televisions and computers, and a symbol of urban fashion and consumer culture. The demand for the development of mobile value-added services provides new development opportunities for related industries.

Both the mobile digital TV receiving box and the mobile phone have the ability to receive and process information on the move. The design foundations of the two have many commonalities, and they also have their own advantages. Mobile digital TV has high picture and sound playback quality and sufficient TV spectrum resources; mobile phones are easy to operate and are familiar to many users, and the operation of mobile communication networks is also very mature. As people's demand for massive amounts of information anytime and anywhere is getting stronger and stronger, the combination of the two will definitely continue to give full play to the potential of mobile communication networks and promote the development of terrestrial digital TV.

Now there is the concept of watching TV on mobile phones, but the current domestic TV programs on mobile phones are based on a separate mobile communication system GPRS or CDMA 1x data channel, and transmit TV programs to an on-demand user in the form of IP streaming media. The data compression format is often the way of high compression rate MPEG4. In this way, even in the 3G era, the data rate has evolved compared to the 2G network, but there are still inherent defects in the transmission of video broadcasting programs, such as low-quality images, expensive use and construction costs, etc. Tsinghua University proposed and successfully developed the terrestrial digital multimedia television broadcasting transmission scheme DMB-T (Terrestrial Digital Multimedia-Television Broadcasting) and the time-domain synchronous orthogonal frequency division multiplexing multi-carrier modulation technology TDS-OFDM (TimeDomain Synchronous Orthogonal Frequency Division Multiplex) , with relatively complete independent intellectual property rights. The Ministry of Information Industry and the State Administration of Radio and Television have formally notified the program to the International Telecommunication Union (ITU). DMB-T is the only domestic transmission scheme with an industrial basis, which makes the European standard technically unable to be adopted by our country as a national standard. Shenzhen Tsinghua Research Institute, as the promotion base for the industrialization of Tsinghua University's DMB-T standard terrestrial digital TV, combined mobile digital TV receivers with mobile communication handsets in the process of developing portable digital TV terminals relying on independent TV standards. The development idea of the terrestrial digital TV receiving USB receiving box with the mobile backhaul function using the wireless metropolitan area network.

Contents of the invention

The technical problem to be solved by the utility model is to design a kind of existing mobile communication coverage network, such as GPRS or CDMA 1x data channel to carry out data return, and utilize a computer with a USB interface to carry out broadcasting needs for terrestrial digital TV. broadcast terrestrial digital television receiver box.

The purpose of this utility model can be realized by adopting the following technical solutions: design a kind of digital TV multifunctional USB receiver box that can utilize the wireless metropolitan area network, including a box body with a USB plug at one end and a circuit board installed in the box body , the circuit board includes a digital TV receiving module with a special antenna for terrestrial digital TV, a mobile communication module with a special antenna for a mobile phone, a USB interface module and its driver P, and the USB interface module is connected with the digital TV receiving module and the The mobile communication module is bidirectionally connected, the signal output end of the USB interface module is connected to a computer with a USB interface, and the driver P is installed in the computer.

The USB interface module includes a USB interface control unit and a digital TV TS stream interface control unit bidirectionally connected with the USB interface control unit, a mobile communication interface control unit and a user identification card interface unit, and the USB interface control unit passes through a USB plug. Pluggable connection with the USB port of the computer with USB port. The user identification card interface control unit unit, the digital TV TS code stream interface control unit unit and the mobile communication module interface control unit unit are independent of each other, and all data enters the computer USB interface control unit with a USB interface through the computer USB interface control unit. Computer with USB interface for processing. Thus, an ordinary computer with a USB interface and an operating system above Windows 2000 immediately becomes a terrestrial digital TV receiving terminal with a transceiver function.

The digital TV receiving module includes a radio frequency tuner, a channel decoder and a PID filter based on FPGA; the radio frequency tuner receives the TV radio frequency signal induced by the special antenna for terrestrial digital TV, and amplifies and tunes the TV radio frequency signal to output the intermediate frequency The (IF) signal is sent to the channel decoder for demodulation processing, and the demodulated intermediate frequency signal is sent into the PID filter based on the FPGA for filtering, and the PID filter based on the FPGA is sent to the USB interface through the 12C bus The module's digital TV TS stream interface control unit outputs TS code stream.

The mobile communication module includes a sending radio frequency unit, a receiving radio frequency unit and a baseband signal processing circuit; the sending radio frequency unit modulates the data stream signal output by the baseband signal processing circuit into a radio frequency signal, which is emitted by the antenna; The receiving radio frequency unit amplifies, demodulates, and digitizes the signal received by the antenna with low noise, recovers the digital baseband signal and sends it to the baseband signal processing circuit, and the baseband signal processing circuit is bidirectionally connected with the mobile communication interface control unit of the USB interface module .

The driver P has a layered structure, including: the lowest operating system core layer, a hardware driver layer above the bottom layer, and the hardware driver layer includes a digital TV hardware driver layer, a system hardware driver layer and a mobile communication layer. Hardware interface software layer; the application layer above the hardware driver layer, the application layer includes TS transport stream data management, data service and application protocol software, mobile communication network layer and mobile communication data link layer, and the uppermost man-machine interface layer, that is, user control, graphic display/screen display, program control and authorization information management. The above-mentioned driver program P is recorded on an optical disc, and the driver program P is installed on a computer using the digital TV multifunctional USB receiving box of the utility model for the first time.

Compared with the prior art, the utility model can utilize the digital TV multifunctional USB receiving box of the wireless metropolitan area network to have the following advantages:

1. Combining digital TV broadcasting and mobile communication network, that is, receiving digital TV programs through the terrestrial digital TV broadcasting network, using the mobile communication network to realize the user's return channel, and realizing digital TV viewing authentication, billing and video on demand;

2. The digital TV receiving terminal combined with digital TV multi-function receiving box and computer has portable mobility, so it has advantages in mobile video conferencing, mobile web browsing, and mobile file download;

3. It has broadcast-style free-to-air TV reception, and there is no peak usage effect when broadcasting;

4. Due to the powerful functions of the computer, digital TV programs can be downloaded, stored and played back at any time;

5. It can be applied to network TV games.

Description of drawings

The descriptions of the attached drawings are as follows:

Fig. 1 is the composition schematic diagram of the digital TV multi-function USB receiving box of the utility model that can utilize wireless metropolitan area network;

Fig. 2 is the principle block diagram of digital TV receiving module 1 among Fig. 1;

Fig. 3 is a schematic block diagram of the mobile communication module 3 in Fig. 1;

Fig. 4 is the principle block diagram of USB interface module 2 among Fig. 1;

FIG. 5 is a schematic diagram of the layered structure of the driver program P. As shown in FIG.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the device of the utility model is described in further detail.

The utility model can utilize the digital TV multifunctional USB receiving box of wireless metropolitan area network to comprise the box body that one end has USB plug and the circuit board installed in the box body, the principle block diagram of described circuit board is as shown in Figure 1, comprises: A digital TV receiving module 1 with a special antenna 5 for terrestrial digital TV, a USB interface module 2 and a mobile communication module 3 with a special antenna for a mobile phone. Described USB interface module 2 is bidirectionally connected with digital TV receiving module 1 and mobile communication module 3 respectively, and described USB interface module 2 is bidirectionally connected with computer 4 with USB interface by USB plug, and the utility model device must also be equipped with driver A program P, the driver P is installed in the computer 4 .

Described digital TV receiving module 1 comprises radio frequency tuner 11, channel decoder 12 and the PID filter 13 based on FPGA; Described radio frequency tuner 11 receives the TV radio frequency signal that terrestrial digital TV special antenna 5 induces, and this TV radio frequency The signal is amplified, tuned and processed to output an intermediate frequency (IF) signal to the channel decoder 12 for demodulation processing, and the FPGA-based PID filter 13 is sent to the digital TV TS flow interface control unit of the USB interface module 2 through the 12C bus 22 outputs the TS code stream, as shown in FIG. 2 . The radio frequency tuner 11 is a silicon chip type, and the TUA6034 tuner IC of Infineon can be used. And the channel decoder 12 needs to carry out different demodulation processes respectively according to different terrestrial digital standards: as ATSC-T is carried out the demodulation of vestigial sideband modulation (VSB); Carry out coded orthogonal frequency division modulation (COFDM) to DVB-T ) demodulation process, and perform time domain synchronous orthogonal frequency division multiplexing multi-carrier modulation (TDS-OFDM) demodulation on DMB-T. The channel decoding circuit of DBM-T is currently mainly composed of the channel decoding chip LGS-8222-A1 of Tsinghua University. The PID filter 13 based on FPGA can filter 32 paths of PIDs simultaneously, and can also distinguish the TS streams of MPEG2 and IP packets, and output the required filtered TS streams to the USB interface module by it. There are many solutions implemented by FPGA, such as the EPIC3T100 chip of ALTERA Company.

As shown in Figure 3, the mobile communication module 3 includes a sending radio frequency unit 31, a receiving radio frequency unit 32 and a baseband signal processing circuit 33, and the sending radio frequency unit 31 converts the data stream outputted by the baseband signal processing circuit 33 The signal is modulated into a radio frequency signal (such as 800MHz, 900MHz or 1800MHz), which is emitted by the antenna 6; the receiving radio frequency unit 32 amplifies, demodulates, and digitizes the signal received by the antenna 6 with low noise, recovers the digital baseband signal and sends it to A baseband signal processing circuit 33 , the baseband signal processing circuit 33 is bidirectionally connected to the USB interface module 2 . The baseband signal processing circuit 33 is mainly composed of a system silicon chip (System on chip) baseband chip, which is different according to the technical standards adopted, such as GSM2 generation, 2.5 generation and 3 generation technology and CDMA2 generation, 2.5 generation and 3 generation Generation, the baseband chip system will have different options. Many companies can supply complete sets of chipsets in large quantities, such as TI, ADI/TTP, Lucent, VLSI, etc. The baseband signal circuit 33 includes processing functions such as channel encoding/decoding, encryption/decryption, channel separation, reference clock circuit, and code rate adapter.

The USB interface module 2 includes a USB interface control unit 21 , a user identification card interface control unit 24 , a digital TV TS stream interface control unit 22 and a mobile communication module interface control unit 23 . The USB interface control unit 21 is bidirectionally connected with the user identification card interface control unit 24, the digital TV TS stream interface control unit 22 and the mobile communication module interface control unit 23 respectively, and the user identification card interface control unit 24 1. The digital TV TS stream interface control unit 22 and the mobile communication module interface control unit 23 are independent of each other, and all data enters the computer 4 through the USB interface control unit 21 for processing, as shown in FIG. 4 . The four parts of the whole USB interface module 2 can be realized with an FPGA of ALTERA Company, or can be realized with respective corresponding chips, such as the ADM8515 chip of ADMtek Company for the USB interface control unit 21 and the digital TV TS stream interface control unit 22 Realize, while the mobile communication module interface control unit 32 and the user identification interface control 24 can be realized through GPIO port programming. The user identification card interface unit 24 is aimed at different standards, namely a SIM interface (suitable for GSM) and a UIM interface (suitable for CDMA).

The computer 4 used in conjunction with the device of the present utility model can be a desktop computer or a laptop computer, and the use of the laptop computer will make the digital television receiving terminal a portable receiving terminal. Computer 4 must be equipped with a USB interface and an operating system with Windows 2000 or above. The driver P is recorded on a CD, and the driver P is installed once on the computer 4 using the digital TV multifunctional USB receiving box of the utility model for the first time.

FIG. 5 is a schematic diagram of the layered structure of the driver program P. As shown in FIG. The driver program P has a layered structure, including: the lowest operating system core layer, and various processes/equipment/memory management functions provided by the embedded operating system, etc. are all realized on this level; It is an operating system of Windows 2000 or above. The hardware driver layer above the bottom layer, it completes the interface drive to the external hardware. Such as digital TV hardware driver layer, system hardware driver layer and mobile communication hardware interface software layer;

The application layer above the hardware driver layer, such as TS transport stream data management, program control, authorization information management, data service and application protocol software, mobile communication network layer and mobile communication data link layer, this layer can call the hardware driver layer, Implement data management and application protocols;

The top layer is the man-machine interface layer, such as user control, frequency tuning, program downloading, etc.

Claims (6)

1, a kind of USB interface-based multi-functional reception box of Digital Television that utilizes wireless MAN, comprise the circuit board that an end has the box body of USB plug and is installed in box body, described circuit board comprises digital TV receiver module (1) that has terrestrial DTV dedicated antenna (5) and the mobile communication module (3) that has mobile phone dedicated antenna (6); It is characterized in that:

Described circuit board also comprises usb interface module (2) and driver P, this usb interface module (2) respectively with digital TV receiver module (1) and two-way connection of mobile communication module (3), described usb interface module (2) is by USB plug and two-way connection of the computer that has USB interface (4), and described driver P is installed in the described computer (4).

2, the Digital Television Multifunctional USB receiving box that utilizes wireless MAN according to claim 1, it is characterized in that: described usb interface module (2) comprises USB interface control unit (21), with the two-way digital TV TS stream interface control unit (22) that is connected of USB interface control unit (21), mobile communication interface control unit (23) and subscriber identification card interface unit (24), described USB interface control unit (21) can plug with the USB mouth of computer (4) by USB plug and be connected respectively.

3, the Digital Television Multifunctional USB receiving box that utilizes wireless MAN according to claim 2 is characterized in that: described digital TV receiver module (1) comprises radio-frequency tuner (11), channel decoder (12) and based on the pid filter (13) of FPGA; Described radio-frequency tuner (11) receives the TV RF signals that terrestrial DTV dedicated antenna (5) induction comes, to this TV RF signals amplify, tuning processing output intermediate frequency (IF) signal passes to channel decoder (12) and carries out demodulation process, intermediate-freuqncy signal after the demodulation is admitted to described pid filter based on FPGA (13) and carries out filtering, and described pid filter based on FPGA (13) is exported the TS code stream by the 12C bus to the digital TV TS stream interface control unit (22) of described usb interface module (2).

4, the Digital Television Multifunctional USB receiving box that utilizes wireless MAN according to claim 2, it is characterized in that: described mobile communication module (3) comprises the radio frequency unit of posting a letter (31), collection of letters radio frequency unit (32) and base band signal process circuit (33); The described radio frequency unit of posting a letter (31) is modulated to radiofrequency signal with the traffic spike of described base band signal process circuit (33) output, is launched by antenna (6); The amplification of signal low noise, demodulation, signal digitalized that described collection of letters radio frequency unit (32) receives antenna (6), recover digital baseband signal and deliver to base band signal process circuit (33), the two-way connection of mobile communication interface control unit (23) of described base band signal process circuit (33) and usb interface module (2).

5, according to claim 1,2, the 3 or 4 described Digital Television Multifunctional USB receiving boxes that utilize wireless MAN, it is characterized in that: described driver P has the structural system of layering, comprise: the operating system kernel layer of the bottom, hardware driving layer on bottom, described hardware driving layer comprise Digital Television hardware driving layer, system hardware Drive Layer and mobile communication hardware interface software layer; Application layer on the hardware driving layer, this application layer comprises the management of TS transmit flow data, the human-machine interface layer of data, services and application protocol software, mobile communications network layer and the mobile data link layer and the superiors, i.e. user's control, picture and text demonstration/screen display, program control and authorization message management.

6, according to claim 1,2, the 3 or 4 described Digital Television Multifunctional USB receiving boxes that utilize wireless MAN, it is characterized in that: the computer (4) that is connected with the described Digital Television Multifunctional USB receiving box that utilizes wireless MAN must possess the operating system of Windows 2000 above versions.

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