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 keyboard to transmit 8-bit words belonging to two groups: first properly said character words and second function words. Among the function words, there are page flag words which indicate that a page number word follows it and make the selection possible. A row flag word is followed by a row number word to indicate the vertical address of a sequence of characters in a page. Adaptation means are provided for adapting the voltage/light characteristics, as in a current gamma correction, which permits correctly displayed logic signals.
An apparatus for providing close captioning in a digital program services delivery system comprises: a rate converter circuit for receiving video codes and outputting video data; a video decoder circuit for receiving the video data and outputting digital Y, U, V data; a digital to analog converter/analog encoder circuit for converting the Y, U, V data into an analog video signal in a prescribed format; a line 21 former circuit for receiving close captioning digital data and forming a line 21 analog signal; and a multiplexor for inserting the line 21 analog signal into the analog video signal.
A teletext receiver incorporating a demodulation circuit, a data demultiplexing circuit, a memory, a microprocessor and a numbering keyboard. The inventive receiver also comprises an early article acquisition decision circuit disposed between the demultiplexing circuit and the memory. This circuit incorporates a shift register with five cells, a storage module having a first group of three storage cells able to store three bytes, a second group of three storage cells able to store three bytes, a two-bit flip-flop, a logic comparison circuit incorporating a first group of three byte comparators, a second group of three byte comparators, an article start code detector, and a comparison synthesis logic circuit connected to the six byte comparators, to the detector and to the flip-flop. This circuit supplies an opening or closing control signal applied to the control input of the memory. The microprocessor loads in an appropriate manner the storage cells with bytes defining a page to be selected and bytes defining a threshold, such that all the articles whose classification bytes exceed this threshold, bring about the appearance of the memory opening signal. The microprocessor checks after each data transmission cycle the state of the memory in order to raise or lower the threshold, or leave it unchanged.
An apparatus for selectively printing either character signals or video signals received by a T.V. receiver on a printing medium wherein the character signals or the video signals are selectively transferred to a video memory prior to printing. This enables the transmission of data from a character decoder to be finished in one vertical period, and there is no need to stop the flow of images on the T.V. screen when they are printed.
An apparatus and method for writing record information in a VCR is disclosed. The apparatus includes a decoder to decode program title data from teletext information via a tuner, a memory to store record information according to an output of the decoder and a key input of a key portion, and a controller for controlling storage and output of record information into the memory. The apparatus further includes a character generator for generating a variety of character signals and for writing record information including program title at the beginning of a program corresponding to the record information output from the memory via the controller.
A system for replacing the newspaper. A radio transmitter transmits the news as "pages" of code. The transmission is received in the home and the encoded pages stored in computer memory. The user selects pages from this memory for viewing on a monitor. That which is new is the storage of the entire news of a moment in mass memory in the home, permitting the user to select directly from this memory the material which he desires to read.
