43 results about "DVB-C" patented technology

A novel cable gateway system and architecture incorporating a hybrid digital video transceiver. The digital cable system architecture combines reception of legacy video such as MPEG-TS based DVB-C streams with that of original IP video over DOCSIS channels. The system comprises a hybrid DVB/IP cable gateway STB capable of receiving both legacy DVB-C video and original IP video streams. The cable gateway device performs the front-end functionality (including QAM receiver, tuner and broadband connection) while the back-end functionality of video decoding and display is performed by one or more standard IP-STBs connected to the cable gateway device over a network (e.g., home LAN). Legacy MPEG-TS based DVB-C video is captured and encapsulated into packets for distribution over the network to the IP-STBs. The cable gateway distributes the original IP video received over the CATV source and the encapsulated legacy video as video over IP packets over the network.

The invention relates to an automatic testing method of mixer third-order intermodulation distortion inside a radio frequency tuner chip, in particular to an automatic testing method of mixer third-order intermodulation distortion inside a DVB-C digital television tuner chip. The automatic testing method adopts the radio frequency apparatus made by Agilent Company as the testing platform. The main equipment of the testing method comprises an Agilent spectrum analyzer E4402B, an Agilent vector signal generator E4438C, an Agilent digital power supply E3649A, an Agilent GPIB link module 82357A and a computer. By means of the IEEE488 communication protocol, the programmable apparatus standard command (SCPI) and chip I<2>C control protocol, test software controls the operating state of the chip and sets and reads relevant parameter of a testing apparatus through the read-write operation of a register arranged inside a tuner chip, thereby realizing automatic radio frequency testing. In addition, the test software consists of an IEEE488 drive module, a parallel port drive module, an I<2>C module and a mixer test module.

The invention provides a method and a system for implementing network time-shifted television supporting DVB CAS, which avoids specific CAS characteristics, adopts a general logic scheme, realizes unified treatment for different CAS and adapts to the present situation that the prior DVB-C or IPTV digital television services adopt a plurality of CAS. The method for implementing network time-shifted television supporting DVB CAS at least comprises a time-shift processing method which applies to TVS network servers and supports DVB CAS scrambling single-program stream data, a network time-shifted television implementation method simultaneously applicable to DVB CAS based on IPQAM access and Ethernet access, and a client software implementation method applicable to DVB CAS network time-shifted television. According to the method and the system for implementing network time-shifted television supporting DVB CAS, the problems of the network time-shifted television in processing DVB CAS scrambling programs can be overcome, and the bottleneck problem of the network time-shifted television in the environment of popularizing digital television is solved.

Interactive wire digit multimedia TV broadcast system characterizes that it is one of any broadcast systems of single or two-way, interactive independer of interactive channels. The down-stream interactive signals are applied of the down-stream channel TDS-OFDM while the up-line interactive signals are in the up-line channel of CDMA TDS-OFDM. The interactive interface of broadcast channel and interactive channel or the common interface of single way broadcast system independent of interactive channel are the top box nulti-transfer network protocols and compatible with Europen DVB-C standard.

A Digital Video Broadcasting-Cable (DVB-C) system and a processing method for reserved tones are provided. A transmitter determines a position of broadcast data and a position of reserved tones in a frame and sends a broadcast signal into which the broadcast data and the reserved tones are inserted. A receiver determines the position of reserved tones in a received broadcast signal and extracts broadcast data from the broadcast signal in consideration of the determined position of the reserved tones. The system and method may compensate for the peak power of broadcast data to be transmitted through a multi-channel bundle, by inserting reserved tones into the whole multi-channel bundle with combined channel bands. This may reduce the Peak to Average Power Ratio (PAPR) of broadcast signals in the DVB-C system and thereby improve the performance of the DVB-C system while still adopting Orthogonal Frequency Division Multiplexing (OFDM).

Basis on complying the DVB-C standard of the cable digital TV set-top box (CDTS), this method collects all channel related info, re-arranges and generates the channel following table (CFT), then sends CFT to CDTS via a DC digital rotary-playing mode. Once starting, CDTS receives CFT, verifies its version, completes the channel searching and renewing within one second. CFT includes all channel data related the current net and is sent in the initial or the default channel. CDTS receives this data during starting to obtain all needed channel info. Using CFT can avoid problems, such as channel searching incompletely, error, etc. due to the wrong former data or signal. It not only simplifies the user operation of channel searching, but also adds functions as: the channel taxis, the channel volume compensation and the channel audio track setting, etc.

The invention discloses a multi-standard television receiver, comprising receiving ports, tuners and a main processor, wherein the receiving ports receive different television standard signals; the tuners modulate the different television standard signals into intermediate-frequency signals and output the intermediate-frequency signals to the main processor for processing; the receiving ports comprises an SATELLITE port for receiving DVB-S (Digital Video Broadcasting-Satellite) and DVB-S2 television signals, an AIR port for receiving DVB-T (Digital Video Broadcasting-Terrestrial) television signals, a CABLE port for receiving DVB-C (Digital Video Broadcasting-Cable) television signals and an ATV (Analog Television) port for receiving analog signals. The technical scheme of the invention contains ATV, DVB-T, DVB-C, DVB-S and DVB-S2 so that almost all European basic television standards are supported. With the five-in-one design, the requirements of different people in most European countries can be satisfied.

The invention discloses a method and terminal for achieving a DVB-C digital television in an Android system. The method includes the steps of A when a DVB icon is selected, triggering a Surface system to build a UI of a DVB application, and displaying the UI, B running a DVB application program in a Linux layer, and starting the DVB application. According to the method and terminal, the DVB application is installed and used in the Android system, the UI of the DVB application is built through the Surface system, the DVB application program is run in the Linux layer, the DVB function is accordingly achieved in the Android system, the problem that an existing Android system does not support the DVB digital television function is solved, and intelligent control over a DVB-C set top box of the digital television is achieved.

The invention discloses an emergency broadcast terminal device and an information safety certificate method thereof, the emergency broadcast terminal device including a GPRS module, a decoding main chip, a network controller, a frequency modulation broadcast receiving unit, a DVB-C signal receiving unit, a command control module, an audio output and power amplification module, has the function of information safety certificate, and can receive and analyze a remote encryption control command; the decoding main chip sends a control command to a command authentication module send and control end by a serial port, the command authentication module returns a decrypted control command after completing the analysis operation of an encrypted command, and the decoding main chip controls the working conditions of the emergency broadcast terminal according to the returned control command. The emergency broadcast terminal device and the information safety certificate method thereof overcome the safety problem of the control command of the emergency broadcast system, and has the characteristics of high safety and strong practicability.

The invention provides an intelligent set top box with a digital right management mechanism and an information security mechanism to solve the problems that an existing set top box is simplex in application function and can not share resources and information security can not be guaranteed when the existing set top box is applied to the internet due to the fact that the existing set top box does not have an information security mechanism. An intelligent terminal product based on big data publication and distribution is obtained on an embedded system platform of the intelligent set top box through research and development. A big data content receiving method based on three types of digital publication and digital distribution, namely, DVB-C, DVB-S and DVB-N, is fused to the embedded platform, and therefore an information security authentication mechanism and a digital certificate of a PKI+CPK dual-key management mechanism are achieved. A VPN and a wireless routing functional module based on WIFI are designed and obtained. Meanwhile, a U-Console intelligent platform system is designed and obtained in the embedded system platform based on a system with the version of android 4.0 or a version higher than android 4.0.

The invention discloses a transmission system for serial digital interface (SDI) high-definition video signals, which comprises a sending end, a receiving end and a coaxial cable for connecting the sending end and the receiving end. The sending end comprises a receiving unit, a high-definition coding unit, a packaging unit, a modulation coding unit and a sending end mixer which are connected in sequence. The receiving end comprises a receiving end mixer, a demodulation decoding unit, a demultiplexing unit, a high-definition decoding unit and an output interface which are connected in sequence. The sending end of the transmission system receives, codes and packages the high-definition video signals which are modulated and coded into digital video broadcasting-cable (DVB-C) radio frequency signals, the sending end is connected with the receiving end through the coaxial cable under 2000m, and the receiving end enables demodulation, channel decoding, demultiplexing and high-definition decoding to be performed on the DVB-C radio frequency signals which are restored back to serial digital video signals or converted into high-definition digital multi-media signals. Therefore, stable transmission of the SDI high-definition video signals at the distance between 100m to 2000m is achieved. Simultaneously, the invention further discloses a transmission method for the SDI high-definition video signals.

The invention discloses digital television receiving equipment and a video data decoding method thereof. The hardware and the connection mode are that: a television high-frequency signal is applied to a television receiving front end, connected with an FIFO cache circuit board, and connected with an EMIF interface on a central processor; and finally, a 3Q9 plug on the central processor is connected with a YPbPr interface of the television, and a hard disk, an MMC card and a U disk are connected with a corresponding interface respectively. The data decoding method comprises the following steps of: (1) inputting a DVB-C wired television radio-frequency signal; (2) transferring a code stream to an inter-chip L2 upper buffer area by using EDMA for head information decoding; (3) if the head information is an inner macro block, calling IMG-mpeg2-vld-intra for decoding, and outputting the decoded IDCT coefficient; (4) if the head information is a non-inner macro block, calling MG-mpeg2-vld-inter for decoding, and outputting the decoded IDCT coefficient; (5) calling a library function IMG-idct-8x8-12q4 for IDCT, and performing motion compensation and frame rearrangement so as to acquire the decoded data; and (6) computing 1/2 pixel precision motion compensation in a motion compensation module by using an iMX processor in VICP.

The invention provides a multi-channel streaming media broadcasting method and system. The method comprises: audio acquisition, including obtaining audio files or audio live broadcast stream input, transcoding and transpackaging input audio according to requirements, pushing audio data to a distribution service in real time, distributing the audio streams to corresponding channels in real time according to requirements, transmitting the audio streams through a transmission coverage network and playing a response by a terminal, and the transmission channels mainly comprising a TS channel and anIP channel. According to the multichannel streaming media broadcasting system and the multi-channel streaming media broadcasting method provided by the invention, the emergency broadcasting system can uniformly and systematically control and manage audio stream distribution of multiple transmission coverage channels such as a DVB-C wired digital television network, a DTMB terrestrial digital television network, an IP network and an FM-RDS broadcasting network, and the emergency broadcast multi-channel streaming media transmission and distribution are more timely, accurate, efficient and controllable.

An adaptive equalized circuit being in consistence to DVB-C standard and being set in cable digital TV consists of front feed tap block operation circuit, equalized Q route adder, equalized I route adder, decision circuit, error calculation circuit, quantization circuit, addition circuit of displacement control amount and back feed tap block operation circuit. It is featured as using quantization circuit and addition circuit of displacement control amount to finalize coefficient update according to processing mode of two said block operation circuits.

The present invention relates to a set top box for receiving DVB-C and DTMB (Digital Television Terrestrial Multimedia Broadcasting) dual-way signals at the same time. The set top box comprises: a main chip configured to process and calculate data and control work of peripheral parts of the system; a tuning unit configured to tune radio and television signals; a demodulator configured to demodulate signals; and a storage configured to store program audio-video data. The present invention further discloses a method for receiving DVB-C and DTMB dual-way signals at the same time. The set top boxsystem and method for receiving DVB-C and DTMB dual-way signals at the same time can play programs in the DVB-C and DTMB signals sources on the same television at the same time and can flexibly switchprograms in different signals so as to reduce the economic cost and enhance use convenience and practicability.

The invention relates to a control circuit for an integral high frequency head between a digital cable television and a digital terrestrial television. The control circuit comprises a radio frequency switcher, which belongs to GaAS IC, wherein the radio frequency switcher acts as a radio frequency single-pole double-throw switch specially used for switching between an input signal of the digital cable television (DVB-C) and the input signal of the digital terrestrial television (DMB-TH); when S2 is a high level (5V), the signal of DVB-C is communicated and the signal of DMB-TH is cut off; when S3 is the high level (5V), the signal of DMB-TH is communicated and the signal of DVB-C is cut off; a 75 ohm impedance matching network consists of C3, L1, C4, R4, R5 and L2; and the signal is amplified by a broadband amplifying circuit consisting of Q1 by 15dB to resist the insertion loss of a forestage circuit. Therefore, convenient switching between the signals of the digital cable television (DVB-C) and the digital terrestrial television (DMB-TH) is realized.

The invention relates to a real-time monitoring system for a digital video broadcasting (DVB-C) television signal. The real-time monitoring system for the DVB-C television signal comprises a DVB-C television signal receiving device, a processor, an audio player and a storage unit. The processor is connected with the DVB-C television signal receiving device, the audio player and the storage unit. When the condition that the digital television signal received by the DVB-C television signal receiving device is abnormal is analyzed out by the processor, the audio player is triggered to send out an audio alarm signal and the storage unit is triggered to start to store voice data and video data of abnormal digital television programs. By the real-time monitoring system for the DVB-C television signal disclosed by the invention, multichannel digital television programs under the DVB-C television signal can be monitored in real time so as to give an alarm and perform processing in time when an abnormal condition occurs.

The invention discloses a five-in-one tuner for television signals. The five-in-one tuner comprises a radio frequency preprocessing module A, a down-conversion module, a digital video broadcasting-terrestrial/cable (DVB-T/C)/Asia television (ATV) demodulation module, a radio frequency preprocessing module B, a zero intermediate frequency processing module, a DVB-satellite/satellite-second generation (S/S2) demodulation module and a decoding module, wherein the radio frequency preprocessing module A is used for performing filtering and inter-level impedance matching on DVB-T/C and ATV signals;the down-conversion module is used for converting the DVT-T/C and ATV signals into low intermediate frequency signals; the DVT-T/C/ATV demodulation module is used for demodulating the low intermediate frequency signals, and outputting audio and video signals or a serial/parallel data stream; the radio frequency preprocessing module B is used for performing filtering and high frequency amplification on DVB-S/S2 signals; the zero intermediate frequency processing module is used for performing frequency conversion on the DVB-S/S2 signals to obtain I/Q signals; the DVB-S/S2 demodulation module isused for demodulating the I/Q signals; and the decoding module is used for decoding the data stream. The five-in-one tuner can realize the compatible demodulation and decoding output of DVB-T, DVB-C,ATV, DVB-S and DVB-S2 television signals.

The invention provides a method for realizing a high-definition hand-hold multi-functional digital video broadcasting-cable (DVB-C) detector. The detector comprises a mainboard with a high-definition decoding master chip, a keyboard plate, a signal demodulation board and a liquid crystal display (LCD). The method comprises the following steps: inputting a group of digital TV parameters by the keyboard plate, saving the parameters in the mainboard, and dispatching the function of each hardware module by the mainboard to finish detection of line signals. The method provided by the invention is used for checking and detecting signal lines, thereby reducing difficulties of the engineering.

The invention relates to a television monitoring system based on a modular framework and equipment. The equipment of the system is radio and television monitoring equipment employing a compact personal communication interface (CPCI) modular chassis design. The system is mainly applied to content monitoring, quality analysis, code stream index detection, radio frequency index monitoring, information acquisition, data display and other monitoring work in the field of radio and television. The system can support monitoring of signals in various modes through configuration, such as analog television signals, cable digital television DVB-C standard signals, signals of terrestrial digital televisions (meeting GB20600-2006 standard in China) and China mobile multimedia broadcasting (CMMB) signals. Meanwhile, a board card module of the equipment is flexibly configured aiming at different monitoring services, so that the effect that one machine has multiple purposes is achieved. Moreover, the requirements on adaptability, flexibility and reliability of a digital radio and television monitoring system are met.

The application discloses a set top box control method and device. The method comprises the following steps: responding to a user request and generating a set top box remote operation request, wherein the set top box remote operation request comprises an identification code and operating instruction information of a set top box to be maintained and the operating instruction information corresponds to fault information of the set top box to be maintained; encapsulating the set top box remote operation request into a transport stream (TS) according to a specified protocol; and modulating the TS to a digital video broadcasting (DVB-C) network so as to allow the set top box specified by the identification code to analyze the TS and execute a corresponding action according to the operating instruction information. According to the invention, the operating instruction information is sent to the set top box through the unidirectional DVB-C network, so as to instruct the fault set top box to execute the corresponding action according to the operating instruction information, as a result, the fault set top box is repaired and a user can watch programs normally.

The invention discloses a multifunctional signal monitor and a signal monitoring method. The monitor monitors an optical signal, a cable signal, a ground wave signal and a satellite signal through each monitoring module and performs analysis, and an MCU single-chip microcomputer receives a server instruction to instruct each monitoring module to operate. The analyzed signal indicators are stored in a data storage module and transmitted to the server through a network signal transmission module. The server performs data comparison and gives an alarm. The multifunctional signal monitor can monitor the signal intensity and signal quality of the DVB-S/S2, DVB-C, DVB-T/T2 and optical links of a station in real time, and transmits the relevant information of the output signals back. The server performs the data comparison and alarm, so a user can also view the uploaded relevant signal data through the terminal software to understand the state of a signal in real time and achieve the effect of multi-channel simultaneous monitoring.