Abstract:
An analog system for processing modulated reflected energy and producing a squarewave output representative of coded information causing the modulation is described. The modulation can be caused by reflecting energy from a segmented label coded by varying the widths of segments having different energy reflectives to define logic 1''s and 0''s. In such a usage, the inventive system produces a squarewave with maximum and minimum amplitudes determined by the segment reflectives and pulse widths proportional to the segment widths. The inventive system provides control of the pulse amplitudes and widths in the presence of noise. The inventive system also provides automatic gain control to compensate for variations in the output energy source, detector variations, power variations, and other internal system variations.
Abstract:
The invention is directed to a system for routing assorted items to preselected destinations. The items to be routed are deposited at any of various reception areas and automatically routed to a particular final destination depending upon the nature of the item. Each item carries a machine readable label, such as a bar coded label, which is scanned by an appropriate scanning mechanism. Information encoded onto the label is then obtained by the scanning mechanism and is injected into appropriate logic decoding circuitry where it is decoded to identify the item, its destination, or both. The decoded information is then applied to the system control logic which routes the label bearing item to the appropriate destination. Movement of items within the system is affected by conveyors or similar devices and appropriately located diverters to control transfer of the items to various conveyor loops or spurs.
Abstract:
A coded label for automatically identifying objects is described. The label is designed such that coding is achieved by the use of data segments with alternate segments having different energy reflective capability. The data segments are arranged in pairs and each defines a digital pulse space. Digital coding in the form of logic 1''s and 0''s is effected by assigning each data segment either of two widths. Hence, when the two segments defining a pulse space are dimensioned such that the segment having one reflective capability is wider than the segment having the other reflective capability, a logic 0 is indicated for the digital pulse base defined by that pair of segments. Reversing the reflective capabilities of the wide and narrow segments results in a reversal of the logic state of the digital pulse space defined by the pair of segments. However, in all instances, the digital pulse spaces defined by the segment pairs are equal and the segments are alternately arranged so that segment separation is realized. The label is also provided with label START and label END sections so that the beginning and ending of label scanning is precisely indicated.