WO2018227816A1 - 基于dvb的传屏设备及方法、dvb接收端 - Google Patents

基于dvb的传屏设备及方法、dvb接收端 Download PDF

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Publication number
WO2018227816A1
WO2018227816A1 PCT/CN2017/104308 CN2017104308W WO2018227816A1 WO 2018227816 A1 WO2018227816 A1 WO 2018227816A1 CN 2017104308 W CN2017104308 W CN 2017104308W WO 2018227816 A1 WO2018227816 A1 WO 2018227816A1
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Prior art keywords
dvb
frequency band
transmission
transmitting end
executable code
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PCT/CN2017/104308
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English (en)
French (fr)
Inventor
欧阳宇基
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广州视源电子科技股份有限公司
广州视臻信息科技有限公司
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Publication of WO2018227816A1 publication Critical patent/WO2018227816A1/zh

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    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
    • H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/75—Media network packet handling
    • H04L65/762—Media network packet handling at the source 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/75—Media network packet handling
    • H04L65/764—Media network packet handling at the destination 

Definitions

  • the present invention relates to the field of wireless transmission, and in particular, to a DVB-based transmission device and method, and a DVB receiving end.
  • the wireless screen transmission technology refers to the instantaneous synchronization of multimedia data on the screen-casting end (such as a computer or a mobile phone) to a designated receiving end (such as a tablet or a television) through a wireless transmission technology, thereby realizing playback on a designated receiving end.
  • the technology of the multimedia data is widely used in home theaters and conferences because it does not require additional cables and additional data transfer equipment for data transmission.
  • the screen player uses the built-in wireless network card to access the wireless network of the receiving end, and transmits the currently played content to the receiving end through the wireless network;
  • the screen is connected to the screen with the WIFI module, and the screen is physically connected to the screen, and then the content currently played by the screen is sent to the wireless network of the receiving end through the screen, so that the receiving end receives the currently playing. content.
  • the screencasting end and the receiving end must access the same WIFI network. If other devices in the network are being uploaded or downloaded, the bandwidth of the screen will be affected, which may cause delay in the screen.
  • the 2.4Ghz band has limited bandwidth, and the channel is crowded, which is easy to interfere with each other.
  • the channel occupancy rate of the 5Ghz band is not high, but the WIFI transmission distance is short.
  • an object of the present invention is to provide a DVB-based transmission device and method, and a DVB receiving end, which can realize parallel transmission, and can reduce delay in multi-channel transmission, and realize smooth audio and video jamming. Play.
  • the invention provides a DVB-based screen transmission device, comprising at least one DVB receiving end and at least one DVB transmitting end;
  • the DVB sender includes:
  • a first connector configured to connect to a port of the screen end, and receive stream data corresponding to the content of the screen to be transmitted sent by the screen end through the port;
  • a first baseband chip configured to generate a DVB carrier signal according to a pre-configured transmission frequency band and a transmission mode, and modulate the stream data by using the DVB carrier signal to generate a modulated signal;
  • a first RF device for transmitting the modulated signal
  • the DVB receiving end includes:
  • a second RF device for receiving the modulated total signal at the current time
  • controller including a memory and a processor, the memory storing a first executable code and a pairing list, the pairing list storing a transmission frequency band and a transmission mode configured for each DVB transmitting end; Executing the first executable code to invoke the pairing list, and reconstructing a modulated signal corresponding to each DVB transmitting end from the adjusted total signal according to the pairing list;
  • a second baseband chip configured to demodulate the reconstructed at least one modulated signal to generate corresponding at least one multimedia data
  • a second connector configured to connect to the port of the display end, and transmit the multimedia data to the display end for decoding and playing.
  • the DVB receiving end further includes:
  • connection port configured to connect to the DVB sender
  • the memory further stores second executable code, the processor being capable of executing the second executable code to: configure a frequency band of a predetermined bandwidth to the connected DVB transmitting end as a transmission of the DVB transmitting end a frequency band and simultaneously configuring a transmission mode of the DVB sender;
  • the DVB transmitting end and the corresponding transmitting frequency band and transmission mode are recorded in the pairing list.
  • the memory further stores third executable code
  • the processor is capable of executing the third executable code to implement the following operations:
  • the transmission frequency band configured by the DVB transmitting end is a frequency band of a predetermined bandwidth located near the central frequency point.
  • the memory further stores fourth executable code
  • the processor is capable of executing the fourth executable code to implement the following operations:
  • the DVB transmitting end of the connection is configured with a frequency band of a predetermined bandwidth as a transmission frequency band, and the transmission mode of the DVB transmitting end is configured at the same time:
  • the DVB receiving end further includes:
  • a parameter input device that enables a user to perform a user operation that triggers transmission of a level parameter selected by the user to the processor.
  • the DVB sender is a plug and play device.
  • the invention also provides a DVB receiving end, comprising:
  • An RF device configured to receive a modulated total signal of a current time; the modulated total signal is composed of a modulated signal sent by at least one DVB transmitting end;
  • controller including a memory and a processor, the memory storing a first executable code and a pairing list, the pairing list storing a transmission frequency band and a transmission mode configured for each DVB transmitting end; Executing the first executable code to invoke the pairing list, and reconstructing a modulated signal corresponding to each DVB transmitting end from the adjusted total signal according to the pairing list;
  • a baseband chip configured to demodulate and demultiplex the reconstructed at least one modulated signal to generate corresponding at least one multimedia data
  • a connector configured to connect to the port of the display end, and transmit the multimedia data generated by the demodulator to the display end for decoding and playing.
  • the DVB receiving end further includes:
  • connection port for connecting to a DVB sender
  • the memory further stores second executable code, the processor being capable of executing the second executable code to: configure a frequency band of a predetermined bandwidth to the connected DVB transmitting end as a transmission of the DVB transmitting end a frequency band and simultaneously configuring a transmission mode of the DVB sender;
  • the DVB transmitting end and the corresponding transmitting frequency band and transmission mode are recorded in the pairing list.
  • said memory further stores a third executable code, said processor being capable of executing said third executable code to: detect a channel quality of a currently available frequency band, to obtain said currently available frequency band Center frequency point;
  • the transmission frequency band configured by the DVB transmitting end is a frequency band of a predetermined bandwidth located near the central frequency point.
  • the memory further stores fourth executable code
  • the processor is capable of executing the fourth executable code to implement the following operations:
  • the transmission mode of the DVB sender is configured as follows:
  • the DVB receiving end further includes:
  • a parameter input device that enables a user to perform a user operation that triggers transmission of a level parameter selected by the user to the processor.
  • the invention also provides a DVB-based screen transmission method, comprising:
  • the generated multimedia data is decoded and played through the display end.
  • the DVB-based projection device and method and the DVB receiving end provided by the embodiments of the present invention use DVB instead of wifi for wireless transmission, and different DVB transmitting ends are configured with different transmission bands, so multiple DVB transmitting ends can be Simultaneously transmitting the modulated signal to the DVB receiving end without generating channel interference, and the DVB receiving end can obtain the modulated signal corresponding to each DVB transmitting end according to the transmission band split of each DVB transmitting end, thereby achieving a many-to-one, Many-to-many parallel real-time transmission solves the delay problem when multi-channel transmission, and realizes smooth audio and video playback.
  • FIG. 1 is a schematic structural diagram of a projection screen system according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a DVB transmitting end according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of time domain and frequency domain of a DVB signal according to an embodiment of the present invention.
  • FIG. 4 is a carrier distribution diagram of a DVB signal in a 2k mode and an 8K mode.
  • FIG. 5 is a schematic diagram of a module of a DVB receiving end according to an embodiment of the present invention.
  • FIG. 6 is a schematic flowchart diagram of a DVB-based screen transmission method according to an embodiment of the present invention.
  • a screen transmission system includes at least one screen projection terminal (such as the first screen projection terminal 110, the second screen projection terminal 120, and the third screen projection terminal 130 in FIG. 1), based on DVB ( Digital Video Broadcasting, digital video broadcasting) screen device and display terminal 400.
  • the DVB-based screen transmission device includes a DVB transmitting end (such as the first DVB transmitting end 210, the second DVB transmitting end 220, and the third DVB transmitting end 230 in FIG. 1) connected to the screen-casting terminal in one-to-one correspondence with The DVB receiving end is wirelessly connected to the DVB receiving end 300.
  • the DVB sender is connected (eg, via a USB or other serial interface) to the corresponding screencast
  • the DVB receiver 300 is connected (eg, via a USB or other serial interface) to the display. End 400.
  • the screencasting end may be a notebook computer, a smart phone, a tablet computer, etc., when the screencasting end needs to synchronize the currently playing multimedia data (such as video, audio, text, etc.) in the
  • the screen projection terminal first collects the multimedia data currently displayed and performs the encoding compression of the corresponding format (for example, encoding and compressing the video data by using h.264), and then using the encoded multimedia data.
  • a multiplexer such as MIXER
  • the stream data is typically Mpeg-TS stream data.
  • the DVB sending end includes:
  • the first connector 201 is configured to connect to the port of the screen end, and receive the stream data corresponding to the content to be transmitted sent by the screen end through the port.
  • the first connector 201 can be a USB protocol-based connector, and the port of the screen can be a USB port, so that the DVB sender can implement plug and play.
  • the first baseband chip 202 is configured to generate a DVB carrier signal according to the pre-configured transmission frequency band and the transmission mode, and modulate the stream data by using the DVB carrier signal to generate a modulated signal.
  • the transmitting frequency end and the transmission mode of the carrier of the DVB transmitting end are configured by the DVB receiving end.
  • the following features and configuration of the DVB signal are configured by the DVB receiving end.
  • the ISM (Industrial Scientific Medical) frequency band is 2402-2480Mhz
  • the DVB receiving end can allocate a frequency band of a predetermined bandwidth in the ISM frequency band as a transmission frequency band of a DVB transmitting end, for example,
  • the first DVB transmitting end 210 is allocated 2450Mhz-2451Mhz as its transmitting frequency band
  • the second DVB transmitting end 220 is assigned 2451Mhz-2452Mhz as its transmitting frequency band
  • the third DVB transmitting end 230 is allocated 2452Mhz-2453Mhz as its transmitting frequency band.
  • Frequency band (the transmission bands configured by different DVB transmitters do not overlap).
  • the DVB receiving end 300 While allocating the transmission band, the DVB receiving end 300 also configures the transmission mode of each DVB transmitting end.
  • the characteristics of the DVB signal are shown in Figure 3. From the perspective of the frequency axis, the DVB signal is a multi-carrier signal composed of many sub-carriers, and its transmission mode is divided into two modes, 2k mode and 8k mode, according to the number of sub-carriers. From the perspective of the axis, the characters formed by these multiple carriers have a certain transmission time. In order to prevent multipath reflection of electric waves, a guard interval is added after the transmission time of each character.
  • subcarriers there are 6817 and 1705 subcarriers in 8k mode and 2k mode, respectively. According to the role of these subcarriers, they can be divided into three categories, namely:
  • Data carrier responsible for transmitting stream data
  • TPS Transmission Parameter Signaling: Contains parameters necessary for receiving signals at the receiving end, such as modulation mode (QPSK, 16QAM, 64QAM), signal error correction code (1/2, 2) /3,3/4,5/6,7/8), transmission mode (2K, 8K), guard interval (1/4, 1/8, 1/16, 1/32), etc.;
  • Pilot signal carrier Its function is to help the receiver to predict and correct the signal amplitude and phase to improve the reception quality.
  • some virtual carriers are usually added to make the total number of carriers reach the nth power of 2, for example, the total number of carriers in the 8k mode after joining the virtual carrier is 8192, which is the 13th power of 2, the total of the 2k mode.
  • the number of carriers is 2048, which is the 11th power of 2 to facilitate the use of inverse fast Fourier transform.
  • the first baseband chip 202 after the sending frequency band and the transmission mode are configured, the first baseband chip 202 generates a corresponding number and distribution of DVB carrier signals according to the transmission frequency band and the transmission mode, and then uses the DVB carrier.
  • the signal performs quadrature amplitude modulation on the received stream data to generate The signal has been adjusted.
  • the first baseband chip 202 may also be used for performing source channel coding and decoding, interleaving and deinterleaving, adding FEC redundancy check data to each piece of data, and the like.
  • the embodiment is not specifically limited.
  • the first RF 203 is configured to transmit the modulated signal.
  • the DVB receiving end 300 includes:
  • the second RF unit 310 is configured to receive the adjusted total signal of the current time.
  • the second radio frequency device 310 may be RF hardware, which can receive the modulated total signal of the current time; wherein the modulated total signal is composed of the modulated signal transmitted by at least one DVB transmitting end. .
  • the controller includes a memory 321 and a processor 322, where the memory 321 stores a first executable code and a pairing list, where the pairing list stores a transmission frequency band and a transmission mode configured for each DVB transmitting end;
  • the processor 322 is capable of executing the first executable code to invoke the pairing list and reconstructing a modulated signal corresponding to each DVB transmitting end from the modulated total signal according to the pairing list.
  • the modulated total signal includes a signal composed of respective frequency bands, and after executing the executable code, the processor 322, according to the frequency band of each signal in the modulated total signal, and each The transmit frequency band configured by the DVB transmitter splits the modulated total signal, and reconstructs the modulated signal corresponding to each DVB transmitter.
  • the second baseband chip 330 is configured to demodulate the reconstructed at least one modulated signal to generate corresponding at least one multimedia data.
  • the second baseband chip 330 can also perform demultiplexing (DEMIXER) on each multimedia data, and separate the audio stream, the video stream and other data streams.
  • DEMIXER demultiplexing
  • a second connector 340 for connecting to a port of the display terminal 400 and generating the demodulator
  • the multimedia data is transmitted to the display terminal 400 for decoding and playing.
  • the display terminal 400 may be configured with a display area for each screen projection end.
  • the first screen projection end 110 corresponds to the first display area 410 and the second screen projection end 120 .
  • the third screen-casting end 130 corresponds to the third display area 430.
  • a many-to-many parallel transmission may also be implemented.
  • multiple DVB receiving ends are respectively connected to multiple display terminals, and the DVB receiving ends all share the same pairing list.
  • the modulated signals broadcast by the plurality of DVB transmitting ends are respectively received by the plurality of DVB receiving ends, and are decomposed by the pairing list, thereby reconstructing the modulated signals corresponding to different DVB transmitting ends, and then demodulating Corresponding multimedia data.
  • the modulated signal is simultaneously transmitted to the DVB receiving end, and the DVB receiving end can obtain the modulated signal corresponding to each DVB transmitting end according to the transmission band split of each DVB transmitting end, thereby realizing parallel real-time transmission, and solving the problem.
  • the delay problem when multi-channel transmission realizes smooth audio and video playback.
  • the DVB receiving end generates multimedia data suitable for playing, and can be directly sent to the player for playing, without adding additional application layer protocol processing; in addition, since no password input and the like are required for verification, plug and play can be realized. It is very convenient to use.
  • the DVB receiving end 300 further includes:
  • a connection port 350 is provided for connecting to the DVB sender.
  • the memory further stores a second executable code, the processor being capable of executing the second executable code to: configure a frequency band of a predetermined bandwidth to the connected DVB transmitting end as the DVB transmitting end Transmitting a frequency band and simultaneously configuring a transmission mode of the DVB transmitting end;
  • the DVB transmitting end and the corresponding transmitting frequency band and transmission mode are recorded in the pairing list.
  • the DVB receiving end 300 has a connection port 350 through which the DVB transmitting end can be connected to the DVB receiving end 300.
  • the processor of the DVB receiving end 300 is connected to the connection port, and after detecting the connection of the DVB transmitting end, executing the executable code to implement steps S102 and S103, thereby configuring the transmitting frequency band to the DVB transmitting end and Transfer mode.
  • said memory further stores a third executable code, said processor being capable of executing said third executable code to: detect a channel quality of a currently available frequency band, to obtain said currently available frequency band The central frequency point; the transmission frequency band configured by the DVB transmitting end is a frequency band of a predetermined bandwidth located near the central frequency point.
  • the processor 322 can execute the executable code to implement the following steps before allocating the transmission band for each DVB sender:
  • the channel quality of the currently available frequency band is detected, and the center frequency of the currently available frequency band is obtained; wherein the center frequency point is the center frequency of the frequency band region that is occupied less. For example, if the DVB receiving end detects that the frequency band near the frequency of 2450 Mhz is occupied less, then 2450 Mhz is determined as the center frequency point.
  • the frequency band allocated by the processor 322 for each DVB transmitter is a frequency band located near the center frequency.
  • 2445Mhz-2455Mhz is a frequency band that can be allocated.
  • the allocation strategy can be The order is assigned: 2445, 2446, 2447..., 2455; it can also be distributed from two sides to the middle: 2445, 2455, 2446, 2454, 2450...; it can also be randomly assigned, only need to ensure the transmission of different DVB senders at the time of allocation
  • the frequency band does not overlap.
  • the center frequency of the currently available frequency band is obtained by detecting the channel quality of the currently available frequency band, and then the frequency band of the predetermined bandwidth near the central frequency point is allocated to the DVB transmitting end as the transmission frequency band. It can ensure that the transmission band configured by the DVB sender is a relatively clean and occupied frequency band, thus ensuring the real-time transmission.
  • one or some of the screencasters are the main screencaster (such as the screencaster used by the presenter), while the other is the secondary screencaster (such as other participants).
  • the main screencaster such as the screencaster used by the presenter
  • the secondary screencaster such as other participants
  • the memory further stores fourth executable code
  • the processor is capable of executing the fourth executable code to implement the following operations:
  • the DVB transmitting end of the connection is configured with a frequency band of a predetermined bandwidth as a transmission frequency band, and the transmission mode of the DVB transmitting end is configured at the same time:
  • each of the DVB transmitting ends is configured with a corresponding level parameter
  • the processor 322 executes the DVB transmitting end after detecting the DVB transmitting end physically connected with itself.
  • the executable code is configured to obtain a level parameter of the DVB transmitting end, and configure a frequency band corresponding to the bandwidth of the level parameter to the DVB transmitting end as a sending frequency band. For example, if the level parameter includes 1, 2, and 3 parameters, the processor 322 allocates a transmission frequency band of 1 Mhz bandwidth to the DVB transmitter that is physically connected to itself, and transmits a frequency band of 1 Mhz bandwidth.
  • the transmission frequency band of 2Mhz bandwidth is allocated to it, and after detecting the metric level of the DVB sender connected to itself is 3, the transmission frequency band of 3Mhz bandwidth is allocated thereto, According to different functions of each DVB sender and different transmission data, different bandwidths can be allocated, thereby taking into consideration the transmission rate and bandwidth usage efficiency.
  • the DVB receiving end 300 further includes:
  • a parameter input device 360 the parameter input device enables a user to perform a user operation that triggers transmission of the level parameter selected by the user to the processor 322.
  • the DVB receiving end 300 provides a parameter input device for the user to operate, so that the user can input the level parameter of the currently connected DVB transmitting end according to the parameter input device, and the level parameter input by the user is transmitted to the processor.
  • the processor 322 configures a transmission frequency band corresponding to the level parameter for the currently connected DVB transmitting end according to the level parameter.
  • the parameter input device 360 can be a key input device, and the user can implement different level parameters by selecting different digital buttons.
  • other input forms are also possible, and the invention is not specifically limited.
  • the present invention further provides a DVB-based transmission method, including:
  • the DVB transmitting end modulates the stream data transmitted by the screen terminal based on the pre-configured transmission frequency and the transmission mode, generates a modulated signal, and sends the modulated signal.
  • the DVB-based projection screen method since different DVB transmitting ends are configured with different transmission frequency bands, and the transmission frequency bands of the respective DVB transmitting ends do not overlap, multiple DVB transmitting ends may not generate channels.
  • the modulated signal is simultaneously transmitted to the DVB receiving end, and the DVB receiving end can obtain the modulated signal corresponding to each DVB transmitting end according to the transmission band split of each DVB transmitting end, thereby realizing many-to-one parallel real-time transmission and solving The delay problem when multi-channel transmission is realized, the audio and video are smooth and not jammed.
  • the DVB receiving end generates multimedia data suitable for playing, and can be directly sent to the player for playing, without adding additional application layer protocol processing; in addition, since no password input and the like are required for verification, plug and play can be realized. It is very convenient to use.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明公开了一种基于DVB的传屏设备，包括DVB接收端及DVB发送端：DVB发送端包括：第一连接器，用于接收传屏端发送的流数据；第一基带芯片，用于对流数据进行调制，生成已调信号；第一射频器，用于发射已调信号；DVB接收端包括：第二射频器，用于接收已调总信号；控制器，包括存储器及处理器，存储器存储有第一可执行代码及配对列表，处理器能执行第一可执行代码，以调用配对列表，并根据配对列表从已调总信号中重建得到对应于各个DVB发送端的已调信号；第二基带芯片，用于对已调信号进行解调制，生成多媒体数据；第二连接器，用于连接至显示端的端口。本发明还公开了基于DVB的传屏方法、DVB接收端，可实现信号的并行传输，并能够降低多路传屏时的延时。

Description

基于DVB的传屏设备及方法、DVB接收端 技术领域
本发明涉及无线传输领域，尤其涉及一种基于DVB的传屏设备及方法、DVB接收端。
背景技术
无线传屏技术是指将投屏端(如电脑、手机)上的多媒体数据通过无线传输技术即时同步地传输到指定的接收端(如平板或电视)上，从而实现在指定的接收端上播放所述多媒体数据的技术。无线传屏技术因其不需要额外的连接线和额外的数据转移设备进行数据的传输，因此被广泛应用于家庭影院以及各类会议中。
目前的无线传屏主要有两种实现方案：一是投屏端利用自带的无线网卡接入接收端的无线网络中，并通过无线网络将当前播放的内容发送到接收端；二是接收端无线接入带有WIFI模块的传屏器，投屏端物理连接到传屏器，再通过传屏器将投屏端当前播放的内容发送到接收端的无线网络内，从而接收端接收到当前播放的内容。
发明人在实施上述方案过程中，发现以上方案存在如下缺陷：
(1)投屏端和接收端必须接入同一个WIFI网络，若该网络下其他设备正在上传或下载，会影响传屏带宽，从而出现传屏画面延迟的问题。
(2)对于WIFI网络，2.4Ghz频段带宽有限，信道拥挤，易互相干扰。而5Ghz频段信道占用率不高，但WIFI传输距离短。
发明内容
针对上述问题，本发明的目的在于提供一种基于DVB的传屏设备及方法、DVB接收端，可实现并行传输，并能够降低多路传屏时的延时，实现音频、视频流畅不卡顿播放。
本发明提供了一种基于DVB的传屏设备，包括至少一个DVB接收端及至少一个DVB发送端；
所述DVB发送端包括：
第一连接器，用于连接至所述传屏端的端口，并接收所述传屏端通过所述端口发送的与待传屏内容相对应的流数据；
第一基带芯片，用于根据预先配置的发送频段及传输模式生成DVB载波信号，并利用所述DVB载波信号对所述流数据进行调制，生成已调信号；
第一射频器，用于发射所述已调信号；
所述DVB接收端包括：
第二射频器，用于接收当前时刻的已调总信号；
控制器，所述控制器包括存储器及处理器，所述存储器存储有第一可执行代码及配对列表，所述配对列表存储有为各个DVB发送端配置的发送频段及传输模式；所述处理器能执行所述第一可执行代码，以调用所述配对列表，并根据所述配对列表从所述已调总信号中重建得到对应于各个DVB发送端的已调信号；
第二基带芯片，用于对重建得到的至少一路已调信号进行解调制，生成对应的至少一路多媒体数据；
第二连接器，用于连接至显示端的端口，并将所述多媒体数据传输给所述显示端进行解码播放。
优选地，所述DVB接收端还包括：
连接端口，用于连接所述DVB发送端；
所述存储器还存储有第二可执行代码，所述处理器能够执行所述第二可执行代码以实现如下操作：向连接的所述DVB发送端配置预定带宽的频段作为所述DVB发送端的发送频段，并同时配置所述DVB发送端的传输模式；
在配对列表中记录所述DVB发送端及对应的发送频段、传输模式。
优选地，所述存储器还存储有第三可执行代码，所述处理器能够执行所述第三可执行代码以实现如下操作：
对当前可用频段的信道质量进行检测，获得所述当前可用频段的中心频点；
则所述DVB发送端被配置的发送频段为位于所述中心频点附近的预定带宽的频段。
优选地，所述存储器还存储有第四可执行代码，所述处理器能够执行所述第四可执行代码以实现如下操作：
获取连接的所述DVB发送端预先配置的等级参数；
则所述向连接的所述DVB发送端配置预定带宽的频段作为发送频段，并同时配置所述DVB发送端的传输模式具体为：
向所述DVB发送端配置与所述等级参数对应带宽的频段作为发送频段，同时配置所述DVB发送端的传输模式。
优选地，所述DVB接收端还包括：
参数输入装置，所述参数输入装置使得用户能够进行用户操作，该用户操作触发所述用户选择的等级参数传输给所述处理器。
优选地，所述DVB发送端为即插即用设备。
本发明还提供了一种DVB接收端，包括：
射频器，用于接收当前时刻的已调总信号；所述已调总信号由至少一个DVB发送端发送的已调信号组成；
控制器，所述控制器包括存储器及处理器，所述存储器存储有第一可执行代码及配对列表，所述配对列表存储有为各个DVB发送端配置的发送频段及传输模式；所述处理器能执行所述第一可执行代码，以调用所述配对列表，并根据所述配对列表从所述已调总信号中重建得到对应于各个DVB发送端的已调信号；
基带芯片，用于对重建得到的至少一路已调信号进行解调制及去复用，生成对应的至少一路多媒体数据；
连接器，用于连接至显示端的端口，并将所述解调器生成的多媒体数据传输给所述显示端进行解码播放。
优选地，所述DVB接收端还包括：
连接端口，用于连接DVB发送端；
所述存储器还存储有第二可执行代码，所述处理器能够执行所述第二可执行代码以实现如下操作：向连接的所述DVB发送端配置预定带宽的频段作为所述DVB发送端的发送频段，并同时配置所述DVB发送端的传输模式；
在配对列表中记录所述DVB发送端及对应的发送频段、传输模式。
优选地，所述存储器还存储有第三可执行代码，所述处理器能够执行所述第三可执行代码以实现如下操作：对当前可用频段的信道质量进行检测，获得所述当前可用频段的中心频点；
则所述DVB发送端被配置的发送频段为位于所述中心频点附近的预定带宽的频段。
优选地，所述存储器还存储有第四可执行代码，所述处理器能够执行所述第四可执行代码以实现如下操作：
获取连接的所述DVB发送端预先配置的等级参数；
则所述向连接的所述DVB发送端配置预定带宽的频段作为发送频段，并 同时配置所述DVB发送端的传输模式具体为：
向所述DVB发送端配置与所述等级参数对应带宽的频段作为发送频段，同时配置所述DVB发送端的传输模式。
优选地，所述DVB接收端还包括：
参数输入装置，所述参数输入装置使得用户能够进行用户操作，该用户操作触发所述用户选择的等级参数传输给所述处理器。
本发明还提供了一种基于DVB的传屏方法，包括：
建立DVB发送端与传屏端的连接；
通过所述DVB发送端，基于预先配置的发送频率及传输模式对传屏端传输的流数据进行调制，生成已调信号，并发送所述已调信号；
通过DVB接收端，接收当前时刻的已调总信号，并调用配对列表从所述已调总信号中重建得到对应于各个DVB发送端的已调信号；其中，所述配对列表存储有为各个DVB发送端配置的发送频段及传输模式；
通过所述DVB接收端，对重建得到的至少一路已调信号进行解调制，生成对应的至少一路多媒体数据；
通过显示端，对生成的多媒体数据进行解码播放。
本发明实施例提供的基于DVB的投屏设备、方法及DVB接收端，采用DVB代替wifi进行无线传输，且不同的DVB发送端被配置的发送频段各不相同，因此多个DVB发送端可以在不产生信道干扰的前提下同时传输已调信号到DVB接收端，且DVB接收端能根据每个DVB发送端的发送频段拆分得到对应每个DVB发送端的已调信号，从而可实现多对一、多对多的并行实时传输，解决了多路传屏时的延时问题，实现音频、视频流畅不卡顿播放。
附图说明
为了更清楚地说明本发明的技术方案，下面将对实施方式中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的投屏系统的结构示意图。
图2是本发明实施例提供的DVB发送端的结构示意图。
图3是本发明实施例提供的DVB信号的时域和频域示意图。
图4是DVB信号在2k模式和8K模式下的载波分布图。
图5是本发明实施例提供的DVB接收端的模块示意图。
图6是本发明实施例提供的基于DVB的传屏方法的流程示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
为便于对本发明的理解，下面先对本发明的基于DVB的传屏设备在整个传屏系统中的应用进行介绍。
请参阅图1，本发明实施例的传屏系统包括至少一个投屏端(如图1中的第一投屏端110、第二投屏端120、第三投屏端130)、基于DVB(Digital Video Broadcasting，数字视频广播)的传屏设备及显示端400。所述基于DVB的传屏设备包括与投屏端一一对应连接的DVB发送端(如图1中的第一DVB发送端210、第二DVB发送端220、第三DVB发送端230)及与所述DVB发送端无线连接的DVB接收端300。其中，所述DVB发送端连接(如通过USB或其他串行接口连接)至相应的所述投屏端，所述DVB接收端300连接(如通过USB或其他串行接口连接)至所述显示端400。
在本发明实施例中，所述投屏端可为笔记本电脑、智能手机、平板电脑等，当所述投屏端需要将当前播放的多媒体数据(如视频、音频以及文字等)同步在所述显示端400进行播放显示时，所述投屏端先采集当前播放显示的多媒体数据，进行对应格式的编码压缩(如用h.264对视频数据编码压缩)，再把编码压缩后的多媒体数据利用复用器(如MIXER)进行复用，并加入时间戳信息以便播放时音视频同步，最终生成用于进行广播的流数据，例如，典型的，所述流数据为Mpeg-TS流数据。
请一并参阅图2，在本发明实施例中，所述DVB发送端包括：
第一连接器201，用于连接至所述传屏端的端口，并接收所述传屏端通过所述端口发送的与待传屏内容相对应的流数据。
在本发明实施例中，所述第一连接器201可为基于USB协议的连接器，所述传屏端的端口可为USB端口，从而所述DVB发送端可以实现即插即用。
第一基带芯片202，用于根据预先配置的发送频段及传输模式生成DVB载波信号，并利用所述DVB载波信号对所述流数据进行调制，生成已调信号。
在本发明实施例中，所述DVB发送端的载波的发送频端及传输模式由所述DVB接收端来配置。下面DVB信号的特点及配置的过程：
以2.4Ghz为例，ISM(Industrial Scientific Medical，工业科学医学)频段为2402-2480Mhz，所述DVB接收端可分配所述ISM频段内的预定带宽的频段作为某个DVB发送端的发送频段，例如，向所述第一DVB发送端210分配2450Mhz-2451Mhz作为其发送频段，向所述第二DVB发送端220分配2451Mhz-2452Mhz作为其发送频段，向第三DVB发送端230分配2452Mhz-2453Mhz作为其发送频段(不同DVB发送端被配置的发送频段没有重叠)。在分配发送频段的同时，所述DVB接收端300还同时配置每个DVB发送端的传输模式。其中，DVB信号的特点如图3所示，从频率轴来看，DVB信号是由许多子载波构成的多载波信号，其传输模式根据子载波数量分成2k模式和8k模式两种模式，从时间轴来看，这些多载波构成的字符具有一定的传输时间， 为了防止电波的多路反射，在每个字符的传输时间后面加入保护间隔。
如图4所示，在频域范围，假设在一段8Mhz模拟带宽，如果采用2k模式，那么在这段带宽内就分布着1705个载波(相当于把这段带宽打散成1705个子载波)，如果采用8k模式，那么就分布着6817个子载波。显然，2k模式的载波间距大于8k模式，考虑到在实际当中的滤波器的可实现性，2k和8k模式下的载波所占有的实际带宽是7.61MHz，因此2k模式和8k模式的载波间距分别是1.116KHz，和4.464K Hz。
上面讲到在8k模式和2k模式中分别含有6817和1705个子载波，根据这些子载波的作用可以分为三类，即:
(1)数据载波：负责传输流数据；
(2)传输参数信令载波(Transport Parameter Signaling，TPS)：含有为方便接收端接收信号所需的参数，例如：调制方式(QPSK，16QAM，64QAM)，信号纠错码(1/2，2/3，3/4，5/6，7/8)，传输模式(2K、8K)，保护间隔(1/4，1/8，1/16，1/32)等；
(3)导频信号载波(Pilot)：其作用是帮助接收端对信号幅度及相位进行预估及校正，改善接收质量。
其中，对于8k模式:总载波数量6817＝6048(数据载波)+68(传数参数信令载波)+701(导频信号载波)，而对于2k模式：总载波数量1705＝1512(数据载波)+17(传数参数信令载波)+176(导频信号载波)。
在有效载波数的基础上，通常会加入一些虚拟载波使其载波总数达到2的n次方，例如加入虚拟载波以后8k模式的总载波数量为8192，是2的13次方，2k模式的总载波数量为2048，是2的11次方，以方便采用反向快速傅里叶变换。
在本发明实施例中，在配置了所述发送频段及传输模式后，所述第一基带芯片202根据所述发送频段及传输模式生成相应数量和分布的DVB载波信号，然后利用所述DVB载波信号对接收到的流数据进行正交振幅调制，生成 已调信号。
需要说明的是，在本发明其他实施例中，所述第一基带芯片202还可用于进行信源信道编码译码，交织解交织、对每片数据加入FEC冗余校验数据等，本发明实施例不做具体限定。
第一射频器203，用于发射所述已调信号。
请一并参阅图5，所述DVB接收端300包括：
第二射频器310，用于接收当前时刻的已调总信号。
在本发明实施例中，所述第二射频器310可为RF硬件，其可接收当前时刻的已调总信号；其中，所述已调总信号由至少一个DVB发送端发射的已调信号组成。
控制器320，所述控制器包括存储器321及处理器322，所述存储器321存储有第一可执行代码及配对列表，所述配对列表存储有为各个DVB发送端配置的发送频段及传输模式；所述处理器322能够执行所述第一可执行代码，以调用所述配对列表，并根据所述配对列表从所述已调总信号中重建得到对应于各个DVB发送端的已调信号。
在本发明实施例中，所述已调总信号包括由各个频段的信号组成，所述处理器322在执行所述可执行代码后，根据已调总信号中的每个信号的频段及为每个DVB发送端配置的发送频段对已调总信号进行拆分，重建得到对应于各个DVB发送端的已调信号。
第二基带芯片330，用于对重建得到的至少一路已调信号进行解调制，生成对应的至少一路多媒体数据。
在本发明实施例中，所述第二基带芯片330还可对每路多媒体数据进行去复用(DEMIXER)，分离出音频流，视频流和其他数据流。
第二连接器340，用于连接至显示端400的端口，并将所述解调器生成的 多媒体数据传输给所述显示端400进行解码播放。
在本发明实施例中，所述显示端400可以预先为每个投屏端配置一块显示区域，如图1所示，第一投屏端110对应第一显示区域410，第二投屏端120对应第二显示区域420，第三投屏端130对应第三显示区域430，如此，不同的投屏端传输的多媒体数据可以同时显示在所述显示端400的不同显示区域上，从而实现了在一个显示端400上同时显示多个投屏端传输的多媒体数据。
需要说明的是，在本发明实施例中，也可实现多对多的并行传输，具体地，多个DVB接收端分别连接多个显示端，这些DVB接收端均共享同一个的配对列表。多个DVB发送端广播的已调信号可所述的多个DVB接收端分别接收，并通过所述配对列表进行信号分解，从而重建得到对应于不同DVB发送端的已调信号，再经过解调制得到相应的多媒体数据。
综上所述，本发明实施例提供的投屏系统，由于不同的DVB发送端被配置的发送频段各不相同，且各个DVB发送端的发送频段各不重叠，因此多个DVB发送端可以在不产生信道干扰的前提下同时传输已调信号到DVB接收端，且DVB接收端能根据每个DVB发送端的发送频段拆分得到对应每个DVB发送端的已调信号，从而实现并行实时传输，解决了多路传屏时的延时问题，实现音频、视频流畅不卡顿播放。此外，所述DVB接收端生成的是适于播放的多媒体数据，可以直接送入播放器播放，无需增加额外的应用层协议处理；另外，由于无需进行密码输入等验证，可以实现即插即用，使用非常方便。
为了便于对本发明的理解，下面对本发明的一些优选实施例做更进一步的描述。
第一个优选实施例：
优选地，
所述DVB接收端300还包括：
连接端口350，用于连接所述DVB发送端。
则所述存储器还存储有第二可执行代码，所述处理器能够执行所述第二可执行代码以实现如下操作：向连接的所述DVB发送端配置预定带宽的频段作为所述DVB发送端的发送频段，并同时配置所述DVB发送端的传输模式；
在配对列表中记录所述DVB发送端及对应的发送频段、传输模式。
在本优选实施例中，所述DVB接收端300具有连接端口350，所述DVB发送端可通过所述连接端口350连接到所述DVB接收端300。所述DVB接收端300的处理器与所述连接端口连接，并在检测到DVB发送端的连接后，执行所述可执行代码以实现步骤S102、S103，从而向所述DVB发送端配置发送频段及传输模式。
第二个优选实施例：
优选地，所述存储器还存储有第三可执行代码，所述处理器能够执行所述第三可执行代码以实现如下操作：对当前可用频段的信道质量进行检测，获得所述当前可用频段的中心频点；则所述DVB发送端被配置的发送频段为位于所述中心频点附近的预定带宽的频段。
在本优选实施例中，为了进一步提升传输的速率，避免出现卡顿问题，在为每个DVB发送端分配发送频段前，所述处理器322可执行所述可执行代码实现以下步骤：
先对当前可用频段的信道质量进行检测，获得所述当前可用频段的中心频点；其中，中心频点为被占用少的频段范围的中心频率。例如，假设所述DVB接收端检测到频率2450Mhz附近的频带被占用比较少，则将2450Mhz确定为中心频点。
在确定了中心频点后，处理器322在为每个DVB发送端分配的频段为位于中心频点附近的频段。例如，对于中心频点2450Mhz，2445Mhz-2455Mhz为可以被分配的频段，在分配时，若每次分配带宽为1Mhz频段，则分配策略可 以为顺序分配：2445、2446、2447...、2455；也可以从两边到中间分配：2445、2455、2446、2454、2450…；也可以是随机分配，只需保证分配时不同DVB发送端的发送频段不产生重叠即可。
本优选实施例中，通过对当前可用频段的信道质量进行检测，获得所述当前可用频段的中心频点，再为DVB发送端分配位于所述中心频点附近的预定带宽的频段作为发送频段，可以保证DVB发送端被配置的发送频段是比较干净、被占用少的频段，从而保证了传输的实时性。
第三个优选实施例：
由于不同投屏端传输的数据类型不同，例如，有些投屏端传输的是视频数据，而有些投屏端只传输文字数据，因此如果每个DVB发送端被配置的频段的带宽都相同的话，若被配置的频段的带宽比较小，则有可能出现传输视频数据的DVB发送端在进行数据传输的时候不够流畅，引起卡顿。若配置的带宽都比较大，则可能出现带宽不够用或者带宽浪费的问题。
此外，在会议场景中，可能某个或某些投屏端是主要的投屏端(例如主讲人使用的投屏端)，而其他是次要的投屏端(例如其他参会人员使用的投屏端)，此时，也需保证主要的投屏端在进行数据传输时足够流畅。
优选地，所述存储器还存储有第四可执行代码，所述处理器能够执行所述第四可执行代码以实现如下操作：
获取连接的所述DVB发送端预先配置的等级参数。
则所述向连接的所述DVB发送端配置预定带宽的频段作为发送频段，并同时配置所述DVB发送端的传输模式具体为：
向所述DVB发送端配置与所述等级参数对应带宽的频段作为发送频段，同时配置所述DVB发送端的传输模式。
具体地，在本优选实施例中，每个所述DVB发送端均被配置了相应的等级参数，所述处理器322在检测到与自身物理连接的DVB发送端后，执行所 述可执行代码以获取所述DVB发送端的等级参数，并向所述DVB发送端配置与所述等级参数对应带宽的频段作为发送频段。例如，假设等级参数包括1，2，3三种参数，则所述处理器322在检测到与自身物理连接的DVB发送端的等级参数为1后，向其分配1Mhz带宽的发送频段，在检测到与自身物理连接的DVB发送端的等级参数为2后，向其分配2Mhz带宽的发送频段，在检测到与自身物理连接的DVB发送端的等级参数为3后，向其分配3Mhz带宽的发送频段，如此，可以根据每个DVB发送端的不同作用和不同传输数据分配不同的带宽，从而同时兼顾了传输速率和带宽的使用效率。
第四个优选实施例：
所述DVB接收端300还包括：
参数输入装置360，所述参数输入装置使得用户能够进行用户操作，该用户操作触发所述用户选择的等级参数传输给所述处理器322。
在本优选实施例中，所述DVB接收端300提供参数输入装置供用户操作，使得用户可以根据所述参数输入装置输入当前连接的DVB发送端的等级参数，用户输入的等级参数传递给处理器，处理器322根据所述等级参数为当前连接的DVB发送端配置与所述等级参数对应的发送频段。
在本优选实施例中，所述参数输入装置360可以为按键输入装置，用户可以通过选择不同的数字按键实现不同的等级参数。此外，还可以有其他输入形式，本发明不做具体限定。
请参阅图6，本发明还提供了一种基于DVB的传屏方法，包括：
S201，建立DVB发送端与传屏端的连接。
S202，通过所述DVB发送端，基于预先配置的发送频率及传输模式对传屏端传输的流数据进行调制，生成已调信号，并发送所述已调信号。
S203，通过DVB接收端，接收当前时刻的已调总信号，并调用配对列表 从所述已调总信号中重建得到对应于各个DVB发送端的已调信号；其中，所述配对列表存储有为各个DVB发送端配置的发送频段及传输模式。
S204，通过所述DVB接收端，对重建得到的至少一路已调信号进行解调制，生成对应的至少一路多媒体数据。
S205，通过显示端，对生成的多媒体数据进行解码播放。
本发明实施例提供的基于DVB的投屏方法，由于不同的DVB发送端被配置的发送频段各不相同，且各个DVB发送端的发送频段各不重叠，因此多个DVB发送端可以在不产生信道干扰的前提下同时传输已调信号到DVB接收端，且DVB接收端能根据每个DVB发送端的发送频段拆分得到对应每个DVB发送端的已调信号，从而实现多对一并行实时传输，解决了多路传屏时的延时问题，实现音频、视频流畅不卡顿播放。此外，所述DVB接收端生成的是适于播放的多媒体数据，可以直接送入播放器播放，无需增加额外的应用层协议处理；另外，由于无需进行密码输入等验证，可以实现即插即用，使用非常方便。
以上所揭露的仅为本发明一种较佳实施例而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。

Claims (12)

  1. 一种基于DVB的传屏设备，其特征在于，包括至少一个DVB接收端及至少一个DVB发送端；
    所述DVB发送端包括：
    第一连接器，用于连接至所述传屏端的端口，并接收所述传屏端通过所述端口发送的与待传屏内容相对应的流数据；
    第一基带芯片，用于根据预先配置的发送频段及传输模式生成DVB载波信号，并利用所述DVB载波信号对所述流数据进行调制，生成已调信号；
    第一射频器，用于发射所述已调信号；
    所述DVB接收端包括：
    第二射频器，用于接收当前时刻的已调总信号；
    控制器，所述控制器包括存储器及处理器，所述存储器存储有第一可执行代码及配对列表，所述配对列表存储有为各个DVB发送端配置的发送频段及传输模式；所述处理器能执行所述第一可执行代码，以调用所述配对列表，并根据所述配对列表从所述已调总信号中重建得到对应于各个DVB发送端的已调信号；
    第二基带芯片，用于对重建得到的至少一路已调信号进行解调制，生成对应的至少一路多媒体数据；
    第二连接器，用于连接至显示端的端口，并将所述多媒体数据传输给所述显示端进行解码播放。
  2. 根据权利要求1所述的基于DVB的传屏设备，其特征在于，所述DVB接收端还包括：
    连接端口，用于连接所述DVB发送端；
    所述存储器还存储有第二可执行代码，所述处理器能够执行所述第二可执行代码以实现如下操作：向连接的所述DVB发送端配置预定带宽的频段作为所述DVB发送端的发送频段，并同时配置所述DVB发送端的传输模式；
    在配对列表中记录所述DVB发送端及对应的发送频段、传输模式。
  3. 根据权利要求2所述的基于DVB的传屏设备，其特征在于，
    所述存储器还存储有第三可执行代码，所述处理器能够执行所述第三可执行代码以实现如下操作：
    对当前可用频段的信道质量进行检测，获得所述当前可用频段的中心频点；
    则所述DVB发送端被配置的发送频段为位于所述中心频点附近的预定带宽的频段。
  4. 根据权利要求2所述的基于DVB的传屏设备，其特征在于，所述存储器还存储有第四可执行代码，所述处理器能够执行所述第四可执行代码以实现如下操作：
    获取连接的所述DVB发送端预先配置的等级参数；
    则所述向连接的所述DVB发送端配置预定带宽的频段作为发送频段，并同时配置所述DVB发送端的传输模式具体为：
    向所述DVB发送端配置与所述等级参数对应带宽的频段作为发送频段，同时配置所述DVB发送端的传输模式。
  5. 根据权利要求2所述的基于DVB的传屏设备，其特征在于，所述DVB接收端还包括：
    参数输入装置，所述参数输入装置使得用户能够进行用户操作，该用户操作触发所述用户选择的等级参数传输给所述处理器。
  6. 根据权利要求1至5任意一项所述的基于DVB的传屏设备，其特征在于，所述DVB发送端为即插即用设备。
  7. 一种DVB接收端，其特征在于，包括：
    射频器，用于接收当前时刻的已调总信号；所述已调总信号由至少一个DVB发送端发送的已调信号组成；
    控制器，所述控制器包括存储器及处理器，所述存储器存储有第一可执行代码及配对列表，所述配对列表存储有为各个DVB发送端配置的发送频段及传输模式；所述处理器能执行所述第一可执行代码，以调用所述配对列表，并根据所述配对列表从所述已调总信号中重建得到对应于各个DVB发送端的已调信号；
    基带芯片，用于对重建得到的至少一路已调信号进行解调制及去复用，生成对应的至少一路多媒体数据；
    连接器，用于连接至显示端的端口，并将所述解调器生成的多媒体数据传输给所述显示端进行解码播放。
  8. 根据权利要求7所述的DVB接收端，其特征在于，所述DVB接收端还包括：
    连接端口，用于连接DVB发送端；
    所述存储器还存储有第二可执行代码，所述处理器能够执行所述第二可执行代码以实现如下操作：向连接的所述DVB发送端配置预定带宽的频段作为 所述DVB发送端的发送频段，并同时配置所述DVB发送端的传输模式；
    在配对列表中记录所述DVB发送端及对应的发送频段、传输模式。
  9. 根据权利要求8所述的DVB接收端，其特征在于，
    所述存储器还存储有第三可执行代码，所述处理器能够执行所述第三可执行代码以实现如下操作：对当前可用频段的信道质量进行检测，获得所述当前可用频段的中心频点；
    则所述DVB发送端被配置的发送频段为位于所述中心频点附近的预定带宽的频段。
  10. 根据权利要求8所述的DVB接收端，其特征在于，所述存储器还存储有第四可执行代码，所述处理器能够执行所述第四可执行代码以实现如下操作：
    获取连接的所述DVB发送端预先配置的等级参数；
    则所述向连接的所述DVB发送端配置预定带宽的频段作为发送频段，并同时配置所述DVB发送端的传输模式具体为：
    向所述DVB发送端配置与所述等级参数对应带宽的频段作为发送频段，同时配置所述DVB发送端的传输模式。
  11. 根据权利要求8所述的DVB接收端，其特征在于，所述DVB接收端还包括：
    参数输入装置，所述参数输入装置使得用户能够进行用户操作，该用户操作触发所述用户选择的等级参数传输给所述处理器。
  12. 一种基于DVB的传屏方法，其特征在于，包括：
    建立DVB发送端与传屏端的连接；
    通过所述DVB发送端，基于预先配置的发送频率及传输模式对传屏端传输的流数据进行调制，生成已调信号，并发送所述已调信号；
    通过DVB接收端，接收当前时刻的已调总信号，并调用配对列表从所述已调总信号中重建得到对应于各个DVB发送端的已调信号；其中，所述配对列表存储有为各个DVB发送端配置的发送频段及传输模式；
    通过所述DVB接收端，对重建得到的至少一路已调信号进行解调制，生成对应的至少一路多媒体数据；
    通过显示端，对生成的多媒体数据进行解码播放。
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