37 results about "Digital television transition" patented technology

The present invention relates to a Vestigial Side Band (VSB) Digital Television (DTV) in agreement with the DTV standards (A/53) of the Advanced Television System Committee (ATSC), and to a method thereof. More particularly, it provides 4-VSB DTV transceiver that improves reception performance of a receiver by transmitting and receiving dual streams formed of normal data and robust data without increasing average power, regardless of a mixing rate of the normal and robust data. The 4-VSB DTV transceiver of the present research includes an encoding unit for encoding the robust data to be mapped to one of two groups having 4 levels {−5, −3, 1, 7} and {−7, −1, 3, 5}.

The embodiment of the invention discloses a digital television program searching method, a digital television receiving terminal and a digital television transmission system. The method comprises the following steps of: locking a dominant frequency point in a digital television network and demodulating to obtain a base band transmission stream so as to acquire a network information table (NIT) and a service description table (SDT) in the base band transmission stream; analyzing the NIT to acquire relative description information of programs contained in a second cyclic transmission stream; analyzing the SDT to acquire program names of all programs in the digital television network; and storing the program names and program description information correspondingly to provide selective playing for users. By the digital television program searching method, the digital television receiving terminal and the digital television transmission system which are provided by the embodiment of the invention, the problems that program search speed is low and user experience is influenced because all program information in the network can be acquired only when all frequency points described in the NIT are required to be locked in the conventional automatic search mode are solved.

Disclosed is a composite set-top box based on software defined radio in the digital television field. A function unit comprises a satellite television signal turner, a cable television signal turner, a ground radiated television signal turner, an A/D transformer, a digital down converter, a software defined radio platform, a MPED-2 main chip system, an analog audio-video processing unit, an embedded control circuit, operating keys and a display panel; wherein the software defined radio system composed of a high-performance DSP completes the demodulation of QAM, QPSK and COFDM three modulation signals; an embedded control circuit is used as the main control unit of the whole television; connects and controls the satellite television signal turner, the cable television signal turner and the ground radiated digital television signal turner, the MPEG-2 main chip system and the software defined radio platform through an I<2>C bus and HPI host interfaces; and connects with the operating keys and the display panel through a GPIO interface. The invention achieves the function that the single set-top box simultaneously receives the satellite signals, the cable television signals and the ground radiated digital television signals.

The invention provides an integrated multi-picture digital video monitoring method and system. The method comprises the following steps of: firstly, receiving one or more digital television signals with the same or different forms; decoding video and audio programs in a plurality of the digital television signals; carrying out comprehensive transmission flow analysis on the digital television signals and verifying whether a transmission flow accords with a suitable standard or not; then, displaying the content of a plurality of decoded videos, and an electric level and an audio volume of an audio sound track corresponding to each video on one or more computer displays or televisions; and displaying analyzed and verified results to a user through operating application programs on the same monitoring system or on different computers connected with the monitoring system through an IP(Internet Protocol) network. The integrated multi-picture digital video monitoring method and system disclosed by the invention have the advantages that only one system needs to be purchased, and multi-picture display, audio volume monitoring and transmission flow analysis functions can be finished; and a great amount of investment capital and a rack space can be saved.

A method and apparatus for removing national television system committee (NTSC) signals from a broadcasted datastream including advanced television system committee (ATSC) signals are provided. The apparatus includes an NTSC signal removing unit for removing the NTSC signal from an input signal with one or a plurality of NTSC filtering units; a vestigial sideband (VSB) core unit for generating an error generating signal if the NTSC signal is not removed by the NTSC signal removing unit for a continuous time period of at least a predefined length; and an NTSC filtering selection unit for applying a control signal to select a different one of the NTSC filtering units in response to the continuous error signal output by the VSB core unit.

The invention relates to the field of digital televisions, and provides an often-watch television channel selection method based on a digital television so that existing problems of long time consumption and energy consumption when a user searches television channels often watched by the user can be solved. The method comprises the steps that channel information of a current television channel is detected; the channel information is extracted from a channel watching record; an often-watch channel list is inquired; whether the often-watch channel list includes the current television channel is conditionally judged; whether watching time is greater than saved playing time is judged at intervals; the channel information of the television channels having the same channel name of the current television channel saved in the often-watch channel list is deleted; and the channel information of the current television channel is added to the often-watch channel list. Rapid selection of the digital television channels can be realized by the technical scheme so that user experience is enhanced.

The invention discloses a multisystem digital television signal front end processing device and a full-digitalization digital television broadcasting system, which solve the problem that the updated television cannot be compatible with the prior satellite television system. The technical scheme comprises that: the device comprises a plurality of different systems of front end decryption modules and a plurality of QAM modulators, wherein the front end decryption modules demodulate and descramble the received different systems of digital signals, and output the descrambled TS stream; and the QAM modulators demodulate the input TS stream according to a QAM mode and output RF signals after each QAM modulator is connected with the front end decryption modules. The device and the system are applied in the field of digital televisions.

The invention provides a syntype set-top box that integrates multiple mainstream CA and multiple mainstream data broadcast, supports multiple format upgrading on-line and multiple program ordering, and supports EPG NVOD and mosaic or the like. The set-top box can satisfy all broadcasting and TV inviting and model machine requirement basically, let client and broadcasting and TV operator learn existing domestically set-top box industry state rapidly. The invention also can help client and broadcasting and TV operator processing analysis and suggestion according with practical situation, customize set-top box rapidly and accelerate conversion course of integrated digital TV.

The invention provides a digital video encoder function testing method. A digital video encoder is respectively connected with a decoder and a central processing unit (CPU), wherein, the decoder is connected with the CPU; the decoder comprises a high-speed analog-to-digital (AD) converter (1); and the CPU comprises a liquid crystal display (LCD) controller and a high-speed AD converter (2). The method comprises the following steps: 10. a video signal is transmitted to a television signal encoder by the CPU through the LCD controller, and the video signal is encoded into a digital television signal; 20. the television signal is converted into an analog video signal through a video analog-to-digital converter, and is processed through a filter; 30. the signal processed by the filter is transmitted to the high-speed AD converter (1) through a multi-path switch, and is converted into a digital signal; and 40. the digital signal is received by the CPU through the high-speed AD converter (2), and analysis processing is carried out to obtain the testing result. The method of the invention has simple operation process, can reduce the cost, can improve the efficiency, and has wide use range.

A digital television translator includes a digital television receiver for receiving a first digital television signal at a first frequency and generating a digital transport stream from the first digital television signal. The digital transport stream can include original Program and System Information (PSIP) data having RX channel data that is indicative of the first frequency, the first major channel number, and/or the first minor channel number. The digital television translator also includes a PSIP update module for updating the original PSIP data in the digital transport stream by replacing the RX channel data with TX channel data. The TX data is indicative of a second frequency, a second major channel number, and/or a second minor channel number. The digital television translator further includes a digital television modulator for converting the digital transport stream having the updated PSIP data into a second digital television signal at the second frequency, where the second frequency can be the same or different from the first frequency.

The embodiment of the invention discloses power line-based digital television signal accessing method. The method comprises the following steps of: receiving a power supply signal and a digital television signal by a power supply module in a digital television; separating the digital television signal; and sending the separated digital television signal to a central processing unit in the digital television for processing. The embodiment of the invention also discloses the digital television. The digital television comprises the power supply module and the central processing unit, wherein the power supply module is used for receiving the power supply signal and the digital television signal, and separating and sending the digital television signal to a modulation/demodulation module; and the central processing unit is used for processing the digital television signal separated by the power supply module. By using the method and the digital television, a user can watch related program contents of the digital television through a power line.

The invention discloses a method for rapidly changing channels of a digital television. The method comprises the following steps that: (1) an electronic program menu interface is entered, and a cursor appears on the electronic program menu interface, wherein the position of the cursor is an initial position; (2) if the digital television detects that the cursor leaves the initial position, the digital television detects a current position of the cursor, and transmits channel information of an electronic program represented by the current position to a DVB (Digital Video Broadcasting) management module; (3) the DVB management module retrieves frequency point information corresponding to the electronic program according to a received channel signal of the electronic program, and transmits the frequency point information to a tuner; (4) the tuner performs frequency locking according to the frequency point information, and returns a frequency locking result to the digital television; and (5) if a user determines to play the electronic program represented by the current position of the cursor, the digital television switches to a channel of the electronic program, and otherwise returning to the step (2) is performed. Through adoption of the method, a frequency point on which the electronic program is to be played is pre-locked. Thus, when the user really executes a channel changing action, the frequency locking time is shortened; the channel changing speed is increased; and the user experience is enhanced.

The embodiment of the invention discloses a digital television test system based on a DSP (Digital Signal Processor), and the system comprises a signal source unit, a DSP unit and a digital television measuring unit. The signal source unit is realized by MATLAB (Matrix Laboratory) software programming on a PC (Personal Computer), and is finished by C language development under SDE (Software Development Environment) of a TDK (TriMedia Developer's Kit); the DSP unit forms a hardware main body structure of a whole television signal generator and is a hardware development platform taking a TriMedia DPSCPU chip of the Philips corporation as a core; and the digital television measuring unit outputs digital television test signals through a monitor and measures by observing output effects. The digital television test system disclosed by the invention can be used as a standard signal source of a digital television video encoding and video processing device.

The embodiment of the invention discloses an audio and video transmission method and a digital television terminal. The method comprises the following steps that a converted YPRBP signal in a to-be-transmitted audio and video signal is converted into an RGB (Red, Green and Blue) signal; the RGB signal and an I2S (Inter-IC Sound) signal in the audio and video signal are encoded; and a TS (Transport Stream) signal is generated, decoded, compressed and then transmitted to wireless equipment. Multi-terminal audio and video output can be achieved without buying an additional digital television terminal or performing wiring decoration.

The present invention relates to a method for the transmission of audiovisual content and/or data to user devices without using digital television tuning resources, in that said content is encapsulated in MPEG2 private sections, subsequently multiplexed and transmitted over a digital television signal. The method uses an interactive application transmitted in a digital television signal which, when executed in the digital television receiver, extracts the MPEG2 private sections containing the audiovisual content and/or data from the digital television signal and, using a local area network (LAN) connection, forwards this audiovisual content and/or data to other user devices connected to the same local area network (LAN) as the digital television receiver. Also described is a device for the transmission of audiovisual content and/or data encapsulated in the MPEG2 private section.

The invention relates to different browsing methods of digital television channels, comprising the following steps: acquisition and storage of program information in different frequency bands, acquisition and storage of program information of different channels in the same frequency band, comparison of different channel numbers and display of the needed channel content. The methods are characterized in that after starting up a TV, channels are automatically searched and channel information is stored; when a user turns on a browsing mode switch in a user menu of a remote controller to start a function of browsing the first channel program in various frequency bands and then presses CH+/- on the remote controller, a system obtains the channel number in the current frequency band and all thechannel numbers from the stored channel information, compares the channel numbers, selects the channel with the minimum channel number and plays the content of the channel; after the user continuously presses CH+/-, the system directly skips to next or previous physical channel, similarly obtains the channel number in the current frequency band and all the channel numbers, selects the channel with the minimum channel number and plays the content of the channel according to the above method while the system skips other digital channels of the current physical channel at the same time; and in the case of only one channel in the frequency band, the content of the current channel is directly displayed, and all the channel programs in all the frequency bands are browsed and displayed sequentially after turning off the browsing mode switch. The methods of the invention can help the user more rapidly understand the content in more frequency bands under the social trend of various digital television program channels, thus reducing browsing time and achieving more humanized operation.