41 results about "DVB-T" patented technology

A transmission method of a digital broadcast which is compatible with the DVB-T terrestrial digital broadcast system in Europe and saves a battery in a mobile terminal is provided. Superframes in DVB-T are divided into units each including plural symbols so that an integer number of TS packets can be carried in each slot. At least one slot is used to transmit one service. Energy dispersion, Reed-Solomon coding, byte interleaving, convolutional coding, and time interleaving are applied to each service. When services for mobile terminal reception and services for fixed terminals are transmitted as the provided services, null packets may be transmitted before and after the slot carrying the mobile receiver service so that the fixed reception service and the mobile reception services are not mixed. If the fixed terminal handles TS packets of the mobile reception service as error packets, it could have no problem in reception.

Transmitting data in a digital video broadcasting for handheld (DVB-H) receiver comprises a transport stream (TS) demultiplexer adapted to extract internet protocol (IP) datagrams from TS data packets; a packet identifier (PID) filter adapted to extract the TS data packets based on the PIDs of the TS data packets; a Multi Protocol Encapsulation-Forward Error Correction (MPE-FEC) random access memory (RAM) unit operatively connected to the TS demultiplexer; a Reed-Solomon decoder operatively connected to the MPE-FEC RAM unit; an IP to TS encapsulator operatively connected to the MPE-FEC RAM unit; a TS multiplexer operatively connected to each of the PID filter and the IP to TS encapsulator, wherein the TS multiplexer is adapted to combine both DVB-Terrestrial (DVB-T) and DVB-H TS data packets into a single combined TS data packet; and a host interface operatively connected to the TS multiplexer.

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.

This invention discloses a digital video receiving system and its method. The system sets a receiving module based on a DVB-T and a DVB-H protocol to receive the digital video of the corresponding DVB-T and DVB-H signal from at least one DVB broadcast transmitter. Furthermore, according to a predetermined receiving mode and a power supply status, the DVB-T mode of the DVB-T protocol or the DVB-H mode of the DVB-H protocol can be selectively set through a determination unit to receive and perform the corresponding digital video. In addition, the determination unit, which may be a circuit or a program, can be respectively auto- or manual-change between the DVB-T mode and the DVB-H mode.

The invention relates to a vehicle-mounted DVB-T (Digital Video Broadcasting-Terrestrial) signal receiver for setting preference programs of a user. The vehicle-mounted DVB-T signal receiver comprises a user attribute memorizer, a manual attribute modifying module, an automatic attribute modifying module, a left and right channel speaker, and an LCD (Liquid Crystal Display), wherein the manual attribute modifying module or the automatic attribute modifying module is used for manually modifying or automatically modifying user attributes comprising preference program queues, image display parameters and sound play parameters; the left and right channel speaker and the LCD are used for playing audio/video programs according to the modified user attributes; the user attribute memorizer is used for storing each user attribute value modified automatically or manually; and the automatic attribute modifying module is used for automatically modifying according to statistics of history values of the user attributes. According to the vehicle-mounted DVB-T signal receiver, services with different grades are provided for users using a public account and a personal account, and various watching requirements of different types of users are met.

The invention discloses a DVB-T (Digital Video Broadcasting-Terrestrial) spectrum sensing method and a DVB-T spectrum sensing system. A data output end of a radio-frequency receiving module is connected with a data input end of a central control processing module through a digital-to-analog conversion module. A data output end of a radio-frequency transmitting module is connected with the data input end of the central control processing module through a digital-to-analog conversion module. A local oscillator output end of the central control processing module is respectively connected with local oscillator control ends of the radio-frequency receiving module and the radio-frequency transmitting module. Aim at simplifying the system hardware structure, realizing the quick switching of a DVB-T frequency band, guaranteeing the spectrum sensing speed and saving processor resources, by using an FPGA (Field Programmable Gate Array) as a processor for flexibly controlling local oscillator frequency output, the goal of full-band coverage of DVB-T is realized; by windowing acquired signals and by adopting a CORDIC (Coordinated Rotation Digital Computer) algorithm, FFT (Fast Fourier Transform) processing is realized; by adopting an energy detection algorithm based on FFT, the sensing of the DVB-T frequency band is realized.

The present invention provides a digital video broadcasting-terrestrial (DVB-T) system and modulation method thereof. The system comprises a transmission module and a receiving module. The transmission module modulates a video signal to a DVB-T signal. The receiving module receives the DVB-T signal via a transmission line and demodulates the DVB-T signal to the video signal, and at the same time, monitoring the signal-to-noise ratio (SNR) or bit error rate (BER), and quantizes them to a reference data. The receiving module transmits the reference data to the transmission module through the same transmission line. The system can determine a control parameter according to the reference data to set the modulation parameter of the DVB-T signal.

A service depends on the location of a device. The device location is determined using DTV signals. More specifically, the device location is determined based on pseudo-ranges between the device and a plurality of digital television (DTV) transmitters and the pseudo-ranges are determined based on broadcast DTV signals received by the device from the DTV transmitters. Examples of DTV signals include the American Television Standards Committee (ATSC) signals, the European Telecommunications Standards Institute Digital Video Broadcasting-Terrestrial (DVB-T) signals and the Japanese Integrated Service Digital Broadcasting-Terrestrial (ISDB-T) signals.

A method for performing channel estimation in a receiver of a digital terrestrial television system can be provided by interpolating a complex signal in a frequency domain using a complex filter. The interpolation can be provided, for example, by interpolating, in the time domain, a fast fourier transformed orthogonal frequency division multiplexing (OFDM) signal and interpolating, in a frequency domain, a complex OFDM signal using the complex filter with a predetermined bandwidth. Related equalizers and computer program products are also disclosed.

An automatic tuning system for a mobile DVB-T (Digital Video Broadcasting-Terrestrial) receiver includes a position detecting system, a plurality of tuners, a plurality of demodulators configured to process DVB-T signals, each of which is paired with one of the plurality of tuners, for demodulating each of the signals received by each of the tuners and comparing the strengths of the signals. A database sets a frequency code relating to the optimum frequency found by the demodulators, to an area-cell code relating to the receiver position, in a processor. The processor controls the automatic tuning system on the basis of the stored frequency codes and current position data from the position detecting system.

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.

A TPS decoder for a DVB-T digital television system includes an input signal estimator, a masking device, a vector index determinator and a lookup table device. The input signal estimator receives a plurality of frequency-domain input signals and a plurality of channel measure signals to thereby produce a plurality of estimated input signals. The masking device performs a masking operation on the estimated input signals to thereby produce a plurality of masking signals. The vector index determinator is based on the masking signals to determine a vector index corresponding to the frequency-domain input signals. The lookup table device is based on the vector index to produce a codeword.

The invention relates to a multiple input multiple output (MIMO) digital video broadcasting-terrestrial (DVB-T) transmitter. The transmitter comprises a packaging multiplexing module, a signal source data processing moule, a digital up frequency conversion processing module and two antennas, wherein the packaging multiplexing module, the signal source data processing module and the digital up frequency conversion processing module are sequentially connected with one another and respectively used for packaging and multiplexing audio-video data, processing the signal source data and carrying out the digital up conversion for the signal source data so as to output a radio frequency signal after the digital up conversion processing, the two antennas are connected with the digital up conversion module so as to receive the radio frequency signal outputted by the digital up conversion processing module and to transmit an MIMO DVB-T signal. Through the MIMO DVB-T transmitter, the signal quality of a car-mounted digital television signal can be improved by utilizing the MIMO technology, and the technical problems such as weak receiving signal and poor television quality caused by the car mounting can be overcome.

The invention provides a generating scheme of a constant coefficient matrix in a reed-solomon (RS) code of a digital video broadcasting-terrestrial (DVB-T) system. The generating scheme is characterized in that the generating device of the constant coefficient matrix in the RS code of DVB-T system mainly consists of six parts of a controller, a domain element binary representation lookup table, a base transfer matrix storage, an anti-base transfer matrix storage, a multiplication unit and a storage unit. According to the generating device of the constant coefficient matrix in the RS code of DVB-T system, 896 times of multiplication and 784 times of addition are removed and the 896 times of the multiplication and the 784 times of the addition are involved in multiplier matrix construction. In terms of each generator polynomial coefficient, binary representation of corresponding 8 domain elements only need taking out from the domain element binary representation lookup table to construct a multiplier matrix of each generator polynomial coefficient, and then a constant coefficient matrix of each generator polynomial coefficient is generated. Then generating device of the constant coefficient matrix in the RS code of DVB-T system is low in calculated amount, easy to achieve and capable of improving the generation speed of the constant coefficient matrix obviously.

A method and a device used for displaying wideband information to a user has a return channel made through a cellular mobile terminal (CMT) providing interactivity. The device (10) has a first antenna (12) and a second antenna (20), a receiver (14, 16) that is coupled to the first antenna and a transmitter (24) that is coupled to the second antenna. The method includes receiving information in a bit-wise manner with the receiver in a first band of RF frequencies; generating a notification of an occurrence of a burst transmission from the transmitter; and in response to the notification, terminating the reception of the information for a portion of one bit time corresponding to a duration of the burst transmission. The method may include an optional step, further in response to the notification, of reducing power consumption by turning off at least a portion of the receiver for a period of time corresponding to the duration of the burst transmission. In one embodiment the first band of radio frequencies is a DVB-T 470-862MHz reception band, and the second band of radio frequencies is a GSM 880-915MHz transmission band. In another embodiment the first band of radio frequencies is a DTV 794-806MHz reception band, and the second band of radio frequencies is a CMT 824-849MHz transmission band.