113 results about "Terrestrial television" patented technology

An HDTV receiver coupled to a terrestrial antenna displays real-time signal strength of terrestrial digital television signals. A graphical user interface preferably displays various data relating to all terrestrial television signals in a scrollable grid format. The grid is displayed within an active video display of a selected television signal from the grid. Audio for the selected channel is also active.

A system provides interactive control of broadband services. There are today systems which offer distributive services, for instance analog cable-TV, analog satellites and acting terrestrial TV-networks. A paradigm shift, however, has been initiated in connection with that digital transmissions have started, which make possible a more spectrum efficient transmission. This means, for instance, that a broadband service such as digital transmission of video channels can be developed by making it interactive. One solution can be to use the GSM-system. For example, services which require low capacity in uplink can utilize the SMS-function is GSM. At larger demand of bandwidth GSM's data services can be utilized, which however prevents calls when the telephone is used for interactive communication. The invention solves this problem by interactive traffic between the transmitting and receiving equipment being managed by an interactive center (IC) which is arranged to execute wanted broadband service. IC in addition is in connection with a distributive centre (DC) for distribution of the broadband signals out on the telecommunications network.

The invention relates to the remote management of a digital terrestrial television device. In order to improve the terrestrial television reception, a control command is transmitted by a distant remote management server through another communication channel, the control command requesting the video device to set at least a digital terrestrial television parameter related to a service list management.

A highly integrated set-top box is implemented on a single semiconductor substrate. For instance, an analog RF tuner is implemented on the same substrate with a digital receiver, and audio-video back-end circuits. The single chip set-top box can be used for satellite, cable, internet, or terrestrial TV applications, or other applications. As a result, the substrate area, assembly time, and associated costs per chip are reduced.

Proposed is a system for recording and playback of television signals from a plurality of television channels, which comprises a computer-based controlling central unit, connectible to a telecommunication network, and a plurality of television receivers, connected to the controlling central unit, for receiving the television signals in each case on one of the television channels via cable television networks and/or television antennas for terrestrial television broadcasting or satellite television transmission. The system further comprises coding modules, connected to the television receivers, for coding the received television signals in a digital format. The controlling central unit is set up to receive recording instructions from users via the telecommunication network and to store the television signals, coded in digital format, which have been received on the television channel specified by the stored recording instructions, at a time specified by the stored recording instructions. The system further comprises a playback module for transmitting the television signals, stored in digital format, via the telecommunication network, in each case for playback on a terminal of a respective user. The system enables users to have television signals from a plurality of television channels recorded at the same time without it being necessary for them to have a video recorder at their disposal or to operate a video recorder.

The invention provides a video-on-demand method. The video-on-demand method sequentially comprises the following steps: a wireless handheld terminal such as a smart phone or a panel personal computer and the like is used by a television user for establishing bidirectional communication data connection through wireless communication network and a video-on-demand (VOD) system, and on-demand request information is transmitted to the VOD system through the data connection; the VOD system transmits requested television programs and VOD authorized instructions to a terminal set top box or a terminal television all-in-one machine by using IP (Internet Protocol) network or DVB (Digital Video Broadcasting) network; and the terminal set top box or the terminal television all-in-one machine plays television programs on a television according to the VOD authorized instructions. The video-on-demand method has the advantages of providing a more powerful human-computer interaction function for video-on-demand business and solving the unidirectional problem of digital video broadcasting network, thereby the video-on-demand business can be supplied without needing bidirectional network transformation and replacing the set top box.

A television receiving device may include a tuner configured to selectively tune a television channel from a first plurality of television channels received from a primary television programming source and a second plurality received from a television programming source other than the primary source, wherein the second plurality is received as over-the-air terrestrial television signals. The device may further include a processor configured to set the tuner to receive the second plurality based on location information of the device and location information of a plurality of over-the-air terrestrial antennas. A system for receiving television signals may include a processor configured to set a television receiving device to receive over-the-air television signals from select over-the-air terrestrial antennas, and to determine the select over-the-air terrestrial antennas based on location information of one of the television receiving device and an antenna device and location information of the plurality of over-the-air terrestrial antennas.

A terrestrial digital television receiver includes a tuner, a demodulator, a demultiplexer, a decoder, and a controller. The tuner receives a terrestrial television signal having an emergency alert table which contains text representing an emergency alert message. The demodulator demodulates the television signal and the demultiplexer demultiplexes the emergency alert table from the demodulated signal. The decoder parses the text data representing the emergency alert message, and the controller control operation of a display device such that the emergency alert message is scrolled across a predetermined portion of a video screen.

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.

The invention provides a method for smoothly upgrading a digital terrestrial television broadcasting system to be of two-way, which is used for smoothly upgrading the digital terrestrial television broadcasting system into a two-way radio broadcasting communication convergence system. The method comprises the following steps: first, a radio uplink return channel is added for a physical transmission layer, and a radio broadband return policy of a plurality of modes based on a software radio technology is adopted at a base station side, and is realized by adding a return signal receiving module at the base station side; an uplink return channel added at a terminal side and a downlink channel of the original broadcasting system can use a frequency division duplex (FDD) mode or a time division duplex (TDD) mode, when the FDD is adopted, the return channel can utilize an idle FM (Frequency Modulation)/VHF (Very High Frequency)/UHF (Ultra High Frequency) broadcasting frequency band formed by frequency planning and spatial-temporal difference, an authorization-free frequency band and an idle broadcasting television frequency band formed in an analog/digital conversion period, and is realized by adding a return signal transmitting module at a two-way terminal side; and for a media access control layer, interactive service is converged in a media access control MAC and broadcasting multiplex MUX layer.

A terrestrial receiver at a premises includes a plurality of antennas and a corresponding plurality of tuners. The terrestrial receiver receives terrestrial television signals via the plurality of antennas and the plurality of tuners and diversity combines a corresponding plurality of terrestrial television channels within the received terrestrial television signals, for example, based on control signals received from one or more customer premises equipment (CPE). The terrestrial receiver processes the diversity combined corresponding plurality of terrestrial television channels and communicates the processed and diversity combined corresponding plurality of terrestrial television channels to the one or more CPE. The diversity combined corresponding plurality of terrestrial television channels may be remodulated, and converted to corresponding analog signals prior to being communicated to the one or more CPE. The diversity combined corresponding plurality of terrestrial television channels may be demodulated and converted to intermediate frequency signals prior to being communicated to the one or more CPE.

The invention relates to a ground digital television system. A front end operates matching software by a server, and all the parameter information of the locally-run programs and satellite programs which users are allowed to watch are made into a super NIT form that resembles the format of an NIT standard form, and the super NIT form is multiplexing-transmitted together with a locally-run program TS stream; a receiving terminal adopts a set top box which is matched with the front end and modulated by a TUNER to demodulate local program signals and satellite program signals respectively. After being started and initialized, the set top box automatically checks whether the NIT form is updated. The central frequency point where the super NIT form of the local program signal is located is searched, and the super NIT information form is analyzed, then program information is stored at a fixed position of the terminal of the set top box, after demodulation and audio-and-video processing, AV signals are output to a TV set to be played normally. The system greatly reduces the investment cost of the front-end equipment, improves the utilization rate of the existing front ends and ensures the security of the program signals of the users.

The invention relates to a media content distribution interactive system and method for a vehicle-mounted mobile environment. The system comprises a vehicle-mounted terminal device, a content delivery server, an access control server, a content synchronization server and an internet Web server, wherein the vehicle-mounted terminal device has the digital terrestrial television reception and the 3G wireless router function and can achieve bulk-storage memory, and the content delivery server is arranged at the front end of a digital television set. The content distribution process comprises two stages; specifically, the first stage is that a digital terrestrial television set is adopted to conduct broadcast-type data delivery, and the second stage is that the vehicle-mounted vehicle adopts a wireless local area network to achieve local interactive access for passengers in a vehicle. Content interaction comprises two stages, passengers in the vehicle achieve interaction with an embedded Web server on the vehicle-mounted terminal, relevant information is uploaded to be stored in the local vehicle-mounted terminal device at first, and then is transmitted back to the internet Web server of a data center through the 3G network to achieve synchronization, and whole network synchronization of interaction resources and management control over the vehicle-mounted terminal device are achieved. The media content distribution interactive system and method for the vehicle-mounted mobile environment have the advantages that the mobile broadband interaction video and audio services are provided for the passengers in the vehicle when the wireless broadband is limited or signals are unstable in the mobile terminal such as a bus and a metro.

A tuner module includes a filter that reduces the signal level outside the frequency band of a selected channel in an input RF signal of terrestrial television broadcasting, a local oscillation circuit that oscillates a local oscillation signal, a mixing circuit that mixes the RF signal in which the signal level outside the frequency band of the selected channel is reduced by the filter and the local oscillation signal oscillated by the local oscillation circuit to downconvert the RF signal to an intermediate frequency signal, and a control circuit that controls the local oscillation frequency of the local oscillation signal oscillated by the local oscillation circuit. The control circuit adjusts the local oscillation frequency to a value that suppresses an effect of a disturbance wave from other channels within a frequency band of the intermediate frequency signal of the selected channel.

The present invention is a two-stage distributed cooperative source positioning method based on pseudo-code spread spectrum, which involves radar detection technology, absorbs the advantages of distributed systems and computer network systems, and realizes the system's positioning search capture and positioning tracking functions separately, reducing the Difficulty in technical implementation. A method and technology for long-distance and high-precision detection of air, ground and sea targets is proposed by using cooperative pseudo-code spread spectrum signals to construct a distributed detection system. The present invention is not only different from the systems and methods of air target detection using the non-cooperative signals of terrestrial TV stations, radio stations and mobile communication base stations that have been developed at home and abroad, but also different from the passive positioning that uses the radiation source carried by the target to achieve detection. system. It can realize reliable detection of unconventional and conventional targets such as stealth aircraft, cruise missiles, and ultra-low-altitude aircraft in a large area, which is of great military value.

The invention discloses a large frequency deviation detecting method of a DTMB receiving system. The position of a frame head is found through a relevance to a PN sequence and a subsection of receivedbaseband sampling signals. Point multiplication is carried out onto a data symbol sample point which is received by and corresponds to a local PN sequence so as to obtain a point-multiplied data sequence. The point-multiplied data sequence undergoes fast Fourier transformation, and a greatest peak value is found from transformed values so as to estimate the large-carrier frequency deviation of tens of and even hundreds of kilohertz. The large frequency deviation detecting method has low complexity, can reliably and correctly estimate the carrier frequency deviation and needs shorter time compared with a frequency scanning method. The method is applicable to digital televisions receiving chips which comply with the national standard of digital terrestrial television of People's Republic ofChina, or other receiving chips of wireless transmission systems using a time domain pseudo-random sequence.

The invention discloses a passive radar signal transmitting and receiving system based on DTMB radiation waves, which is characterized by including a direct wave receiving antenna, an echo receiving antenna, an echo receiver, a direct wave receiver, a Beidou receiver, a communication adapter and an integrated data processing platform. By means of the above mode, the system uses the time basis reference of the terrestrial digital television signal to modify and optimize the data format protocol based on the existing national standard terrestrial television standard protocol, realizes the three-dimensional precise positioning and early warning tracking of airborne moving targets by matching time and estimating time delay information, has the characteristics of anti-stealth ability and stronganti-interference ability, and can be used for search, alert, guidance and command and the like of airborne targets by the air defense system.

An imaging system uses `RF daylight` created by an RF illumination source, such as a television broadcast tower, to passively generate RF scattering coefficients for multiple points within a prescribed three-dimensional volume being illuminated by the RF transmitter. The scattering coefficients provide a complex interference pattern having amplitude and phase components that contain all information necessary to recreate a three-dimensional monochromatic image of the illuminated scene. Coherent complex correlation provides scene information content that is only a function of scene scattering and collector geometry. The scene information may be coupled to an image utility subsystem, such as a virtual reality simulator, for generation of a three-dimensional image of the illuminated scene.

The invention provides an antenna oscillator amplifier board and a vehicle-mounted antenna system. The antenna oscillator amplifier board comprises an antenna oscillator. The antenna oscillator is composed of two PCBs (printed circuit boards) connected by a transition support, and each PCB is divided into an upper part, a middle part and a lower part. Each upper part of the PCB board is coated with copper on both sides, folded lines are distributed on the middle part, and the folded lines on the PCBs are connected through the transition support; and an amplifier is arranged on the lower part of one PCB, and is connected with the antenna oscillator. According to the arrangement of the antenna oscillator amplifier board, the amplifier is arranged on the lower part of the PCB which constitutes the antenna oscillator, so that size of the antenna oscillator amplifier board is greatly reduced; the antenna oscillator can be accommodated in a shell shaped like a shark' fin and looks more attractive, and wind resistance is reduced; a satellite navigation antenna module, a mobile communication antenna module and a terrestrial television antenna module and the like or optional combinations thereof can be arranged in the shell shaped like the shark's fin, so that the vehicle-mounted antenna system has multi-band and multipurpose receiving functions.

The invention relates to an E-type patch based horizontally-polarized digital television transmitting antenna array. The transmitting antenna array comprises a horizontally-polarized antenna unit, an equivalent-power-division in-phase feed network, a patch connector and an input connector; the horizontally-polarized antenna unit is formed by two laminated patch radiation units in a flushed in-phase arrangement; the laminated patch radiation unit comprises a rectangular parasitic patch top layer, a rectangular parasitic patch second layer, an E-type patch and a floor plate; the equivalent-power-division in-phase feed network is positioned between the E-type patch and the floor plate, and connected with the E-type patch through the patch connector; and an outer conductor of the input connector is fixed in the floor plate while the inner conductor of the input connector penetrates through the floor plate to be connected with the equivalent-power-division in-phase feed network. By adoption of the laminated structure and the E-type patch, the impendence bandwidth and the bearing power of the antenna are improved so as to satisfy the operating requirements of ground television broadcasting transmitting systems; and the E-type patch based horizontally-polarized digital television transmitting antenna array has the characteristics of wide working frequency bandwidth, high gain, low standing-wave ratio, high bearing power, simple process, convenient debugging and the like.

The invention provides a three-into-one-mode-based set-top box and a realization method. The set-top box comprises a control chip processor, a demodulator connected to the control chip processor, and a tuning device connected to the demodulator. The control chip processor is connected to a tuner by a TS steam switch; the tuner is used for receiving terrestrial television, satellite television and cable television signals. The control chip processor is also connected with a video encoder, an audio D/A converter and an infrared receiver. Compatibility with satellite, ground and wired tuning modes is realized by using one tuning device and receiving of different modes is realized based control among control chip processor, the demodulator, and the tuning device, so that different signal receiving demands of users can be satisfied; the set-top box can be used conveniently; the using cost is lowered; the beautiful and space-saving effects as well as saving and environment protection effects are realized.