76 results about "Digital tv broadcasting" patented technology

Device and method for converting a format of a video signal in a digital TV receiver is provided. Format conversion can be carried out at one chip of a format converting device, inclusive of conversion of resolution, frame rate, scanning method, aspect ratio, color space, chroma format, and gamma correction. Therefore, the digital TV receiver is made to convert a wide range of video signals inclusive of, not only a digital TV broadcasting signal, but also analog TV broadcasting signal, and computer video signal, at one chip of system block. Moreover, the digital TV receiver is made to provide a variety of standards of format converted video signals, not only to the connected display, but also to other general video signal processing devices.

The system comprises three parts: adapter in single frequency network, GPS receiver, and modulator of supporting ground digital TV broadcasting in single frequency network. At central transmitting terminal, the adapter inserts MIP packets in transmission code stream. MIP packet carries synchronizing time label relevant to GPS receiver and system maximal time delay to each relay station etc. In each relay station, synchronization system detects M1P packets, reading out time label and maximal time delay, measuring time delay of received signal, calculating out additional time delay. According to the additional time delay, TS flow is delayed properly in order to make signal synchronization again among relay stations. The disclosed scheme is realized through FPGA, and is applied to ground digital multiple media broadcasting transmission system forwaded by Tsinghua Univ. Favorable effect is obtained through actual try.

Device and method for real time monitoring, and providing of useful progr am specific information (PSI) of a program received from a digital TV broadcasting system to a watcher, wherein, when broadcasting program PSI is changed, the change of th e PSI is detected by monitoring a PMT in a PSIP, and facts of the change or addition of additional functions for a program following the change or addition of the PSI of the digital broadcasting program is reflected and informed to a watcher.

The present invention provides a wireless redistribution system for terrestrial digital TV broadcasting applied to a TV receiver capable of receiving signals of a VHF band in addition to signals of a UHF band as a frequency band of terrestrial digital TV broadcast signals. The system comprises: a transmitter, into which terrestrial digital TV broadcast signals received by an outdoor antenna are inputted, for converting the frequency of the inputted terrestrial digital TV broadcast signals to a frequency of an unused channel of the VHF band collectively, and then amplifying and transmitting them wirelessly; and a receiver for receiving and amplifying signals transmitted from the transmitter, and then supplying them to the TV receiver.

The present invention relates to the field of digital information transmission technology. The hierarchical block product code (BPC) error correcting, encoding and modulation method includes: coding the input data code stream with different priority level in separate BPC code to obtain BPC stream, mapping the BPC stream based on definition to different bits of planisphere symbol of set modulationmode to obtain hierarchical modulation signal output with different antijamming capability. The present invention has the advantages of simple embodiment, more priority levels, powerful error correcting capacity and high reliability, and may be used in ground digital TV broadcasting system and other fields.

A TV broadcasting reception apparatus 100 has a following function: when the same program is being broadcasted at the same time between digital TV broadcasting and analog TV broadcasting, even if the user selects reception of the analog TV broadcasting, the same program in the digital TV broadcasting is found out and the analog TV broadcasting is preferentially and automatically switched to the digital TV broadcasting. Further, the TV broadcasting reception apparatus 100 has a following function: when the same program is being broadcasted at the same time between digital TV broadcasting and analog TV broadcasting, in case that during receiving the digital TV broadcasting, the reception state of its digital TV broadcasting worsens so that the digital TV broadcasting cannot be received, the program in the digital TV broadcasting is preferentially and automatically switched to the same program in the analog TV broadcasting that has been previously searched.

The present invention relates to an apparatus for transforming digital TV broadcasting signals into digital radio broadcasting signals and a method thereof. The apparatus includes: a transport stream generator for transforming TV broadcasting signals outputted from outside into digital TV broadcasting transport streams; a broadcasting transport format transformer for generating digital radio broadcasting transport streams by transforming the digital TV broadcasting transport streams in conformity to a digital radio broadcasting transport protocol based on a radio broadcasting schedule; a digital radio broadcasting multiplexer for multiplexing the generated digital radio broadcasting transport streams generated in the broadcasting transport format transformer; a modulating / up-converting unit for modulating the multiplexed digital radio broadcasting transport streams in a modulation method of digital radio broadcasting and up-converting frequencies of the modulated radio broadcasting signals into radio frequency (RF) signals; and a high-power amplifier for amplifying and transmitting the up-converted RF signals through a transmitting antenna.

A tuner unit generates a local oscillation signal which is multiplied by a received first IF signal to change the frequency of the received first IF signal, and converts the frequency-changed first IF signal into a baseband signal. A demodulation unit detects the signal level of demodulated data, and notifies the signal level to a control unit. The control unit compares the signal level notified by the demodulation unit with a reference value stored in a storage unit, and if the signal level is equal to or smaller than the reference value, makes the tuner unit change the frequency of a local oscillation signal to be used for frequency conversion of the first IF signal and perform a channel selection in a next frequency range. Time taken to start providing a service can therefore be shortened.

Provided is a demodulation apparatus capable of reducing time delay of an on-channel repeater in a terrestrial digital television (TV) broadcasting system and a demodulation method thereof. The demodulation method includes the steps of a) converting an analogue intermediate frequency (IF) signal into a digital IF signal; b) generating an in-phase (I) signal and a quadrature (Q) signal by converting the frequency of the digital IF signals and down-converting the frequencies of the pilot components of the I and Q signals so that the center frequencies of the I and Q signals could be shifted to 0; c) filtering the down-converted I and Q signals and maximizing signal-to-noise ratio; d) up-converting the filtered I and Q signals into baseband signals in which the center frequencies of the filtered I and Q signals are placed in baseband and shifting the frequency of the pilot components of the filtered I and Q signals to 0; and e) adding up the up-converted I and Q signals to restore the signals into baseband signals for broadcasting.

The invention discloses a method of personal identification of digital TV broadcasting signal, which applies part or all of program content, time information and channel identification information of digital TV to generate personal identification code of a broadcasting TV signal on a transmission front end of the digital TV broadcasting signal, then the personal identification code of the broadcasting TV signal is placed in a self-defined data code flow which meets the standard of digital TV code flow and the self-defined data code flow reuses the transmission together with the former digital TV transmission flow; the illegal signal can be identified effectively through judging the legitimacy, effectiveness and integrity of the received content by selecting and detecting the personal identification code of the digital TV signal on a transmission receiving end of the digital TV broadcasting signal. Each part of information of personal identification code provided by the invention has a uniformed simple block structure, and the receiving end can carry out the analysis conveniently. The invention can reasonably choose the corresponding signature information to generate the personal identification code according to different safety protection requirements, thus realizing the higher performance cost ratio on the premise of guaranteeing the system requirements.

When a channel of a digital TV broadcasting is selected, a direction information of the channel, which is stored in a channel setting table, is set in a smart antenna and then, in a case of a signal absence state of a broadcasting signal or when a reduction of receiving signal intensity is detected, an optimal directivity direction, in which the broadcasting signal is reproducible and the receiving state of the wave is optimal, is determined by switching (scanning) the directivity direction of the smart antenna. And, the determined directivity direction is stored in the channel setting table as the direction information of a current channel and the directivity direction is set in the smart antenna.

A digital broadcasting receiver capable of receiving a plurality of types of digital broadcasting, for example, digital satellite broadcasting, digital ground wave broadcasting and digital CATV broadcasting. The digital broadcasting receiver includes a software utilizing demodulating section for demodulating a digitized intermediate-frequency signal, a memory for storing software to be used in the software utilizing demodulating section so that each digital broadcasting capable of being received is demodulated, and a control section for giving a command to the software utilizing demodulating section so that the software for demodulating each digital broadcasting is selectively used by the software utilizing demodulating section according to a setting made by a remote control transmitting unit or a key input section which is a setting input section.

The disclosed receive and decipher method for digital TV broadcast business comprises: a master terminal applies the copyright object of relative digital TBV broadcast business and / or program for the slave terminal; the latter receives and deciphers the relative business and / or program. This invention enhances flexibility for broadcast business.

A mobile terminal capable of breaking a phase-noise signal caused by a high power transmission signal of a mobile phone such as GSM when receiving digital TV broadcasting such as DVB-H and a method of reducing interfering phase-noise in the mobile terminal. The mobile terminal includes a first RF transmitter / receiver; a first signal coupler; a phase-noise filter; a phase shifter; a VGA amplifier; and a signal combiner.

The invention is a system framing structure for use in using the system framing module to implement process of time domain and frequency domain. The system frame is processed through the selector to select frequency domain processing mode or time domain processing mode. The system information for selecting both domains can be implemented by sending short PN code with different phases. The invention can make the ground digital TV broadcasting system to implement the integration process of time domain and frequency domain and to implement unified process for the single carrier and multi carrier.

An broadcasting receiver suitable for receiving a broadcasting signal transmitted in an IBOC signal format, includes: a narrowband filtering means suitable for processing an analog broadcasting signal included in the broadcasting signal; a wideband filtering means suitable for processing a digital broadcasting signal included in the broadcasting signal; a demodulating means for demodulating the broadcasting signal; a signal level detecting means for detecting a level of the broadcasting signal; a digital determining means for determining whether the broadcasting signal includes digital broadcasting signal or not; and a filter switching means for switching filtering means for use in processing the broadcasting signal to be input to the demodulating means between the narrowband filtering means and the wideband filtering means, according to the level of the detected broadcasting signal, when the digital determining means determines that the broadcasting signal does not include the digital broadcasting signal.

A digital broadcasting system comprising of a digital broadcasting station, a set of digital broadcast receivers, and a switched network, wherein the digital broadcasting station transmits a digital signal to the set of digital broadcast receivers, and the digital broadcast receivers exchange error correction information with each other using the network to compensate errors in local receptions of the digital signal at each digital broadcast receiver location.

This invention relates to one method to automatically useful waveband searching method in digital broadcasting radio and comprises one receiving digital broadcasting emission digital signals transferring device, one digital broadcasting signals to receive the digital broadcasting, one play device, wherein, the method can search the band in the tuning band and displays the band when it is found to provide the users with relative frequency band in on frequency codes.

A digital TV broadcasting reception processing unit including a digital TV tuner and an OFDM demodulator receives a digital broadcasting program of the terrestrial digital TV broadcasting. An analog TV broadcasting reception processing unit including an analog TV tuner and an MPEG 2 encoder receives an analog broadcasting program of the terrestrial analog TV broadcasting. When broadcasting program data is input from the digital TV broadcasting reception processing unit, an encryption device decrypts and re-encrypts the broadcasting program data using a first system to output thus decrypted and re-encrypted data to a PCI bus, and when broadcasting program data is input from the analog TV broadcasting reception processing unit, the encryption device decrypts and re-encrypts the broadcasting program data using a second system to output thus decrypted and re-encrypted data to the PCI bus.

A digital TV receiving device includes a control circuit board and a TV tuner; a built-in signal receiver in the digital TV receiving device receives AV signals transmitted by digital TV broadcasting system; the TV turner decodes and modulates those AV signals, and then transmits modulated / restored digital signals to an externally connected information host to output for presentation.

When a channel of a digital TV broadcasting is selected, a direction information of the channel, which is stored in a channel setting table, is set in a smart antenna and then, in a case of a signal absence state of a broadcasting signal or when a reduction of receiving signal intensity is detected, an optimal directivity direction, in which the broadcasting signal is reproducible and the receiving state of the wave is optimal, is determined by switching (scanning) the directivity direction of the smart antenna. And, the determined directivity direction is stored in the channel setting table as the direction information of a current channel and the directivity direction is set in the smart antenna.

Provided is a modulation apparatus that can reduce time delay of on-channel repeaters in a terrestrial digital television broadcasting system. The time delay is caused by a filter during the modulation operation in the on-channel repeaters. The modulation apparatus of the present research includes: a baseband signal forming unit for forming a baseband signal by combining the output signals of an equalization unit with the pre-defined field / segment synchronization signals in the on-channel repeaters; a pilot inserting unit for inserting a pilot signal to the baseband signal; an up-sampling unit for up-sampling the baseband signal with the pilot signal; a VSB filtering unit for filtering the up-sampled baseband signal based on a Window technique and / or an Equi-Ripple filter to thereby form an in-phase (I) signal and a quadrature (Q) signal; an up-converting unit for up-converting the frequencies of the filtered I and Q signals to frequencies of an intermediate frequency (IF) band; an adding unit for adding the up-converted I and Q signals and converting a resultant signal into a digital VSB signal of the IF band; and a digital-to-analogue converting unit for converting the digital signal of the IF band to an analogue signal.

A mobile terminal capable of breaking a phase-noise signal caused by a high power transmission signal of a mobile phone such as GSM when receiving digital TV broadcasting such as DVB-H and a method of reducing interfering phase-noise in the mobile terminal. The mobile terminal includes a first RF transmitter / receiver; a first signal coupler; a phase-noise filter; a phase shifter; a VGA amplifier; and a signal combiner.

A relay station and method for ATSC terrestrial digital television broadcasting services are disclosed. The co-channel relay station includes: a receiving unit for receiving radio frequency (RF) broadcast signals from the main transmitter; a frequency downlink conversion unit for converting received RF broadcast signals into intermediate frequency (IF) signals; a demodulation unit , used to convert the converted intermediate frequency signal into a baseband signal; an equalization unit, used to remove noise and multipath signals generated from the converted baseband signal; a modulation unit, used to convert the baseband signal into an intermediate frequency signal; frequency uplink The channel conversion unit is used to convert the intermediate frequency signal into a radio frequency broadcast signal; the high-power amplifying unit is used to amplify and relay the converted radio frequency broadcast signal; the transmitting unit is used to transmit the radio frequency broadcast signal output from the high-power amplifying unit and a signal synchronization unit that generates a first reference frequency, and generates a second reference frequency based on the first reference frequency so that the transmit / receive signal is frequency and phase synchronized.

Provided is a modulation apparatus that can reduce time delay of on-channel repeaters in a terrestrial digital television broadcasting system. The time delay is caused by a filter during the modulation operation in the on-channel repeaters. The modulation apparatus of the present research includes: a baseband signal forming unit for forming a baseband signal by combining the output signals of an equalization unit with the pre-defined field / segment synchronization signals in the on-channel repeaters; a pilot inserting unit for inserting a pilot signal to the baseband signal; an up-sampling unit for up-sampling the baseband signal with the pilot signal; a VSB filtering unit for filtering the up-sampled baseband signal based on a Window technique and / or an Equi-Ripple filter to thereby form an in-phase (I) signal and a quadrature (Q) signal; an up-converting unit for up-converting the frequencies of the filtered I and Q signals to frequencies of an intermediate frequency (IF) band; an adding unit for adding the up-converted I and Q signals and converting a resultant signal into a digital VSB signal of the IF band; and a digital-to-analogue converting unit for converting the digital signal of the IF band to an analogue signal.

A broadcasting transmitting / receiving apparatus and a control method thereof are disclosed. The broadcasting transmitting / receiving apparatus includes: a signal receiving unit which receives a digital TV signal; a first signal processing unit which acquires video and / or audio from the received digital TV signal; a second signal processing unit which generates an analog TV signal which includes the acquired video and / or audio; an antenna unit which transmits the generated analog TV signal; and a controller which controls the first and second signal processing units to transmit the analog TV signal which corresponds to the digital TV signal selected from among a plurality of channels. With this configuration, it is possible for a user to view a digital TV broadcasting on an existing analog TV at minimal additional cost.

The invention discloses a reception apparatus and an antenna switch circuit of same and a tuner module. PND and portable TV which are employed for receiving digital TV broadcasting used for switching onboard external connected antenna and built-in antenna do not require large antenna switching IC and antenna switching control signal. A diode switch in replacement of the antenna switch IC is disposed and configured to perform switch with the on / off of a power source which is provided with LNA for provision for the external connected antenna. Therefore, the selection of any of the two antennae can realize simplification of components in usage and control signals and minimization of apparatus.

The invention discloses a method for satellite TV safe receiving through a microcontroller, which relates to a digital information processing technology for managing and controlling satellite TV broadcasting in a communication field. Based on prior related standards and technologies of the satellite digital TV, extracting, judging and filtering of the satellite TV programs are achieved by an embedded microcontroller, and analysis of a transfer stream signal is finished by the microcontroller. Then station names of the TV programs are extracted and compared with the allowable receiving station names in a memory to judge whether the programs belongs to the allowable receiving TV programs or not, and so the transfer stream of the allowable receiving TV programs is passed. The invention has the advantages that the analysis of the transfer stream signal is realized by the microcontroller; a plurality of related work of designing special digital logic circuit can be avoided, and effective management and control to the satellite digital TV broadcasting can be realized.