Abstract: A network termination unit to connect a plurality of analog terminals and digital terminals to a U interface of an ISDN telecommunications network. An echo compensator is connected to the U interface to suppress an echo signal produced by the attachment of the terminal device to the U interface. A first bus connects the echo compensator to a communication controller, an a/b interface component block that is compatible with an a/b interface to which an analog terminal is connected, and an S interface component block to which a digital terminal is connected. A processor system, connected to communication controller and a/b interface component block, programs the echo compensator and the S interface component block. B channels of the ISDN telecommunications network are activated and deactivated in response to commands issued by the communication controller. The processor system further evaluates and prepares D channel signalling data for the a/b interface component block.

Abstract: Method and apparatus for automatic optical inspection of a substantially two-dimensional pattern using digital image processing techniques are described. In a first processing step, all regions of a digitized stored image derived from the two-dimensional pattern are scanned for edges or lines, that is, transitions between regions having optically different characteristics. The scanned edge regions are marked in the image storage. In a subsequent second processing step all non-marked regions of the image storage are scanned and tested for the presence of permissible grey levels. A meander-shaped scanning track is used for scanning the edge or lined regions. The apparatus for implementing this method includes special latch circuitry for eliminating the further processing of marked regions, thus increasing the overall speed at which the two-dimensional pattern can be optically inspected.