Abstract: The disclosure concerns a communication system for line printers, such as teleprinter equipment, via high-quality radio communications. The repetition of the signals received mutilated takes place per line of signals at the end of a number of lines. The transmitter for the system comprises a counter from which the line number is fed to the transmitter during the line printer return or the line feed period up to the end of the page or the message. The receiver detects which lines have been received mutilated and registers their line numbers. Then the request for repetition of the numbered mutilated lines is made at the end of each message and at the end of each page of the message, if the message is longer than a page, for example, 32 lines.

Abstract: At a transmitter of a digital transmission system which uses a redundant transmission code to transmit data, at least one predetermined code combination which occurs randomly in the encoded data is selectively modified, to form a predetermined code violation, in dependence upon an additional signal which is to be transmitted. At a receiver, the predetermined code violation is detected and corrected to reproduce the additional signal and the data. By selection of appropriate code combinations and violations more than one additional signal can be transmitted. The arrangement is particularly suitable for transmission of additional signals, which may comprise protection switching signals or a digital voice channel signal, via fiber optic transmission links using 2AMI encoding.

Abstract: An adapter is provided as an interface between a raster output scanning printer and an electronic image processor which formats digital information for use by the printer in creating printed images. The adapter accepts digital pulses through a structured array of communication lines from the electronic image processor. Each line is dedicated to the provision of certain video or control information which may be utilized by any one of a number of different raster output scanning printers. The electronic image processor is indifferent to the identity of the type of printer to which information is provided as the adapter serves to manipulate the data provided by the electronic image processor in a manner suitable to control the particular printer employed. The adapter is sensitive to the scanning cycles of the printer and accommodates deviations in scan time to increase or decrease the rate of provision of video information in accordance with fluctuations in printer motor speed.

Abstract: A method of and communication system for transmitting data, such as telegrams, messages and information, from a transmitting station to a receiving station, both stations possessing transmitter and receiver sections. The data to be transmitted, such as telegrams, is provided, by means of an identification device of the transmitting station, with names from a predetermined list in a manner such that such data can be detected by an evaluation device of the receiving station and identified in its sequence. The predetermined list of names is known to the evaluation device.

Abstract: Method and apparatus for supplying to marking means, character bit data from a two-dimensional matrix of rows and columns of storage elements wherein character selection is made by specifying the character storage cell and character width. Characters are symmetrically stored about the vertical axis of a preassigned matrix having an even number of columns and the binary width data are translated as starting and stopping addresses on opposite sides of the axis for readout of columns therebetween. The center storage of the character with clear margins enables the raw binary width data to be used as one edge address and its complement to be used as the other address in determining the width of the character to be retrieved and printed. Proportional spacing and justification are simply achieved by varying the width data as required.

Abstract: A system for reducing the time for repeating erroneous signals through a series of interconnected ARQ-circuits (automatic error correction circuits), in which the durations of the repetition cycles of the ARQ-circuits, as compared to one another, are not equal. The system comprises means at a connection point and capable of storing a number of signals related to each propagation time of a circuit located before the connection point, when a circuit located behind the connection point goes through a repetition procedure including means for generating a special signal to indicate when a repetition procedure is in process in one of said ARQ interconnected circuits to prevent the other interconnected ARQ circuits from also going through their repetition procedures.