Abstract: An optical scanner with variable line resolution, said scanner collecting information from an original along lines with a predetermined mutual spacing. A calculating unit calculates the location of lines with desired resolution with respect to the scanned lines in response to a desired resolution. A line detector registers optical information along lines on the original and supplies a signal representing the registered, optical information. The information signal is branched along two branches in a branch means. A delay is coupled in one of said branches and is adapted to delay the information signal passing in the branch for a period of time corresponding to a line length in said information signal. An interpolation means receives the information signals from said branches and forms as a desired line an interpolation signal between information signals in response to the location of the desired line with respect to the location of the scanned lines.

Abstract: A scanner system comprises an optical line detector for linewise, optical scanning of an original for generating a data signal in response to the grey-level received by the detector from points along a respective line. The points are sorted with associated grey-level values in groups in response to their positional origin on the original. The individual threshold values for the grey-level values are determined statistically for a plurality of zones on the original in response to the frequency of respective grey-level values in the respective zone. The threshold values of respective zones are stored in a store. The original is re-entered by linewise, optical scanning, and the data signal generated by the scanning and representing grey-levels in points along respective, entered lines is compared in a comparator with a threshold value calculated for the point concerned, and in response to this a binary, electric representation of the original is generated.

Abstract: An optical scanner having a variable resolution wherein an optical detecting unit controlled by a pixel clock signal generates a discrete signal representing pixels scanned in a region. An analog-to-digital converter converts the signal to a digital signal with a preselected resolution controlled by a sample clock generator. The sample clock generator receives the pixel clock signal, and through a counter and a store, operates an addressed, binary data word which is sent to a register. The register is coupled to a further periodic clock generator that controls reading from the register and provides a clock signal with pulses when the bits of the data word assume a first binary state, and no pulses when the bits assume a second binary state. The clock signal is passed to the analog-to-digital converter as a sample clock signal.

Abstract: A digital data representation of an original entered by optical scanning is provided by generating a data signal having grey-level values for points on a scanning line transversely to the original in the scanning. Then local threshold values of zones on the original are determined. These local threshold values are determined statistically in response to the frequency distribution of grey-level values belonging to points from line segments in the zone. The grey-level value frequency distribution of the zones is updated currently, segments from the line last scanned replacing the oldest line segments in the zones, whereby the frequency distribution is changed and updated threshold values are determined. The grey-level value of a point is compared with the updated threshold value of the zone concerned to determine a state of the point in the digital data representation, and the states of the individual points are stored to provide the digital data representation.

Abstract: At least two line segments of discrete elements forming part of a line of discrete elements are aligned to form a line. Each line segment is collected by a light sensitive sensor array (2, 3) having a number of light sensitive cells forming a segment vector (80). Each sensor array (2, 3) has a total visional field which is divided into an active visional field and a visional field edge, that aligning means, present in the coinciding visual field of two sensor arrays are imaged by initialization in at least one cell in the segment vector (80). The active visional fields of the sensory arrays are determined in dependence on the position of the aligning means in the segment vector (80). The line is joined by the cells (84) of the segment vectors, which cells (84) represent the active visional field, while the cells (82) representing the visional field edge are skipped.

Abstract: A multiprocessor computer system wherein memory buses of separate central processing unit systems are interfaced to an intermemory communication network for transfer of data between memories of said separate central processing unit systems.The intermemory communication network includes a plurality of preferably passive intermemory communication links being tapped for connection to link adapters interfacing a number of central processing unit systems to each intermemory communication link. The number of central processing unit systems may be different for different intermemory communication links.The memory buses are configurated to allow for direct data transfer between any memory fraction of a common memory shared by at least two central processing unit systems without interfering with the central processing units such that the data transfer is controlled by direct memory access control means.

Abstract: A time multiplex controlled data system containing a plurality of data processing units (2A, 2B . . . 2N) which are connected to a time control unit (1) containing a multiplex table (7). Normally, the data processing units have both a transmitter and a receiver, and the system is so designed that several transmitters are connected to a common, passive bus (3) arranged to carry information only in a direction towards the time control unit (1), while several receivers are connected to a second, passive bus (4) arranged to carry information from the control unit (1) only in a direction towards the data processing units and so that any communication between the data processing units takes place via the time control unit (1).

Abstract: A coupling circuit for transferring data from a data transmitter to a bus common to several transmitters, each data transmitter being galvanically separated from the bus. The coupling circuit has a signal separator and a switch connected in series between its input and an output connected to the bus. The switch is controlled solely by the data signals transferred from the data transmitter via the signal separator and a rectifier circuit.

Abstract: A method of supervising a plurality of data processing units in a redundant data processing system for controlling a telephone exchange having redundant digital switching networks, preferably of the TST type (Time-Space-Time), said processing units serving i.a. to set up and delete redundant communication channels through the switching networks. The process is original in that error detecting is provided for by comparing associated telecommunication output data from each switching network, a discrepancy in anyone of said comparisons indicating an error in the set up by the controlling units of the respective communication channel through the switching networks. This obviates microsynchronization of the units which may consequently comprise more than two units.