Matches 351 - 392 out of 392 < 1 2 3 4 5 6 7 8
Match Document Document Title
4567531 Vertical interval signal encoding under SMPTE control  
A method and means for vertical interval encoding of a program signal having at least a video program portion with sequential fields separated by vertical intervals, the program signal having...
4556904 Teletext system having user prompt commands  
Special prompt character identifying control codes are inserted in teletext data for transmission to a teletext equipped receiver. The prompt character identifying codes are detected in the...
4550407 Method of analyzing broadcast data, a network analyzer implementing such a method, and receiver equipment using such an analyzer  
A teletext network analyzer includes a coupler for forwarding received data to a data processor. The coupler is programmable by the data processor to select data associated with one or more...
4532540 Teletext set-top converter with transparent mode  
A set-top teletext converter decodes the chroma burst signal of a color television signal with the substantially same amplitude and phase as the burst in the television signal. The teletext signal...
4520392 Teletext reception indicator  
An indicator is described for alerting a television viewer to the fact that a teletext signal is being received. In the preferred embodiment, the indicator includes a control which senses the...
4518984 Device for flicker-free reproduction of television pictures and text and graphics pages  
As is well known, a virtually flicker-free picture is obtained by using a sufficiently high picture-reproducing frequency and doing without interlaced scanning. This is achieved with a suitable...
4496975 One-way data transmission systems  
A one-way teletext data transmission system is an improvement over a known eletext system sold under the trademark "ANTIOPE" which transmits data having error correction and ciphering. The length...
4486779 Apparatus to display graphic messages transmitted by videotext systems  
A TV receiver is adapted to display either the regularly broadcast video signals or videotext information. The video signals contain their own internal synchronization signals. The videotext...
4481536 Teletext system for displaying data on the screen of a television receiver  
The data are received in a demodulator and then are grouped into data packets at the output of a demultiplexer. The demultiplexer is connected to the demodulator by phasing flip flops. Gates are...
4471377 Color information display apparatus  
A color information display apparatus includes a common memory of an integrated circuit configuration for storing both pattern data and color data describing an attribute of the corresponding...
4461002 Digital signal receiver  
A digital signal receiver is structured to receive and demodulate a digital signal. Such digital signal may comprise, for example, a television signal of character multiplex transmission having a...
4449145 Intelligent teletext decoder  
An equalizer and decoder system compensating for multipath distortion in digital format signals sent by teletext, for example. The system loads demodulated data signals and a received reference...
4439761 Terminal generation of dynamically redefinable character sets  
A graphic display terminal is arranged to receive from a sending source drawing instructions containing the description of a display character. The terminal, under control independent from the...
4420833 Unidirectional data transmission system  
A system broadcasts videotext data in the form of data packets originating from numerical data coming from several paths. Each packet has a prefix which contains synchronization and path...
4393376 Teletext interface for digital storage medium having synthetic video generator  
A teletext interface is coupled between a television receiver and a medium storing a plurality of digitally encoded signals each representing a selected text/graphics character intended for...
4393404 Special services teletext communications system  
A teletext communications system includes a transmitter cyclically transmitting a plurality of conventional teletext encoded data rows together with one or more teletext encoded special services...
4388639 Color control circuit for teletext-type decoder  
A color control circuit for selectively modifying the red, green and blue color signals developed at the output of a teletext-type decoder comprises a common input stage responsive to the teletext...
4388645 Teletext communication system with timed multipage local memory  
A teletext communications system comprises a transmitter, e.g. an orbiting satellite, transmitting multiple pages of a teletext encoded data service at selected times of the day, each teletext page...
4365329 Process and device for phasing a local clock  
The most favorable clock signal among n available signals which present equal successive phase shifts is selected by comparison with a synchronization burst. For this, a logic phase comparison is...
4361850 Color television receiver with character display function  
A color television receiver has a decoder for producing red, green and blue driving currents which are applied to red, green and blue control circuits, respectively, for combining these three...
4361848 System for digitally transmitting and displaying data on television receiver screen  
A teletext system for broadcast of pages of magazines to be displayed on television receiver screen. A subscriber entitled to receive a magazine can select a desired page thereof by actuating a...
4358790 Electrical data pulse slicing  
A method of and an arrangement for slicing data in the form of a bi-amplitude data pulse signal comprising a sequence of clock pulses followed by a sequence of data pulses. The absolute mean...
4358788 Legibility for alpha-mosaic characters  
In add-on alpha-mosaic character (teletext) decoders, the character signals pass through the limited bandwidth chroma channel of the TV receiver. For certain color combinations and signal durations...
4347532 Picture display device arranged for displaying a mixed picture signal as an interlaced television picture  
A picture display device arranged for displaying, as an interlaced television picture, a mixed picture signal on a picture display tube, this picture signal including a television signal produced...
4337483 Text video-transmission system provided with means for controlling access to the information  
A text video-transmission system comprising an information emitting center and receiving stations, the emitting center comprising encryption means using an operating key, each receiving station...
4337485 Broadcast teletext system  
Each broadcast page contains a row such as row 29 which is outside the set of displayed rows. In addition to the standard initial bytes CR (clock run in), FC (framing code) and MRAG (magazine...
4321596 Method of aligning videotex characters and device for carrying out such a method  
A method of aligning videotex characters on the screen of a television set, said characters being arranged in horizontal rows each occupying a number of scanning lines, wherein the vertical...
4306250 Television receiver arrangement having means for the selective use of separated or locally generated synchronizing signals  
In a television receiver adapted for the display of a normal television picture and/or message information in which both separated synchronizing signals and locally derived synchronizing signals...
4303940 Raster manipulated television receiver  
A television receiver is disclosed for selectively displaying either a 525 line NTSC video signal or a 625 line European teletext or Viewdata signal. The receiver includes two vertical countdown...
4288809 Television receiver apparatus for selectively displaying a video picture or alphanumeric data information  
Television receiver apparatus is disclosed for receiving and selectively displaying a video picture derived from video signals transmitted on a broadcasting channel, or alphanumeric data...
4233628 NTSC receiver useable with Teletext/Viewdata information  
A Teletext equipped NTSC television receiver system includes means for compressing the raster in the vertical direction in response to 625-line formatted Teletext signals to display normally...
4205343 Television system transmitting enciphered data signals during field blanking interval  
A television system for broadcasting data simultaneously with but independently of television programs, in which digitally coded information carrying signals are superimposed or otherwise added to...
4148066 Interface for enabling continuous high speed row grabbing video display with real time hard copy print out thereof  
An interface for enabling continuous high speed row grabbing video display with real time hard copy print out thereof interfaces a hard copy printer with a real time frame grabbing video display...
4099258 System of data storage  
In a Teletext transmission system data is transmitted in digital form during lines in the field blanking period of the composite video signal of a television transmission. On reception the...
4099259 Data stores and data storage system  
In a Teletext transmission system, data is transmitted in digital form during lines in the field blanking period of a composite video signal of a television transmission. On reception, the...
4074315 Apparatus for reproducing multiplex video data  
An apparatus for reproducing multiplex video data which records data for symbols multiplexed with the main video signals in a memory and continuously reads out the data from the memory and...
4052719 Television receiver system having facility for storage and display of character information selected from digitally encoded broadcast transmissions  
According to the invention, a television receiver system comprises selector equipment for selecting information in the form of coded characters, received separately from any picture signals, from a...
3996583 System for processing data signals for insertion in television signals  
In any television transmission system there are periods during which the wide-band picture signals are absent. The invention provides a signal generator system for the transmission of digital...
3982065 Combined television/data receivers  
A receiver for a television transmission system of the kind in which some of the line scan periods of a conventional transmission that are left blank (as far as picture content is concerned)...
3961137 Biphase digital television systems  
Apparatus for processing groups of digital data for transmission comprises a run-in signal generator for providing at the output of the apparatus an output in which the groups of data are each...
3891792 Television character crawl display method and apparatus  
A method and apparatus for superimposing printed characters of any such nature as may be transmitted upon a received television image, at the will of the viewer at the receiver. The character...
3798610 MULTIPLEXED INTELLIGENCE COMMUNICATIONS  
Time multiplexed signal communications between a host computer and subordinate data processing terminals include coded and non-coded information. Coded information originated by the host includes...
Matches 351 - 392 out of 392 < 1 2 3 4 5 6 7 8