公开(公告)号：EP0346938A2

公开(公告)日：1989-12-20

申请号：EP89111014.0

申请日：1989-06-16

Applicant: MICROSCAN SYSTEMS INCORPORATED

Inventor： Mertel, Michael E. ,  Thomas, James E.

IPC: G06K7/14 ,  G06K7/016

CPC classification number: G06K7/14

Abstract: Scanned barcodes represented by an electrical signal are preprocessed in a PLA and delivered to a microprocessor in a form that permits efficient final processing of the data. High speed edge detection produce edge markers for the control logic and counting circuits coupled with a Johnson state counter to logically sequence the processor. Logarithmic conversion compresses the counted time interval to a single data word that can most efficiently be processed by the host microprocessor. Logic between the preprocessor and the microprocessor transfer digital representations of each bar and space to preassigned respective areas in the microprocessor memory. Bar/space margin detection performs a ratiometric comparison of each bar and space to determine every occurrence of 10:1 ratios of both bar/space and space/bar. Pointer signal information is transferred to the microprocessor indicating precisely where in memory each 10:1 margin ratio is located. A digital filter excludes spurious bar/space width in the preprocessor.

Abstract translation: 由电信号表示的扫描条形码在PLA中预处理，并以允许数据的有效最终处理的形式传送到微处理器。 高速边缘检测产生用于与Johnson状态计数器耦合的控制逻辑和计数电路的边缘标记，用于对处理器进行逻辑排序。 对数转换将计数的时间间隔压缩为主机微处理器最有效地处理的单个数据字。 预处理器和微处理器之间的逻辑将每个条和空间的数字表示传送到微处理器存储器中的预分配的各个区域。 条/空间余量检测执行每个条形和空间的比例比较，以确定条形/空间和空格/条的10：1比例的每次出现。 指针信号信息被传送到微处理器，其精确地指示每10：1的保证比位于存储器中的位置。 数字滤波器不包括预处理器中的杂条/空格宽度。

公开(公告)号：EP0346938B1

公开(公告)日：1993-11-24

申请号：EP89111014.0

申请日：1989-06-16

Applicant: MICROSCAN SYSTEMS INCORPORATED

Inventor： Mertel, Michael E. ,  Thomas, James E.

IPC: G06K7/14 ,  G06K7/016

CPC classification number: G06K7/14

公开(公告)号：EP0346938A3

公开(公告)日：1990-04-18

申请号：EP89111014.0

申请日：1989-06-16

Applicant: MICROSCAN SYSTEMS INCORPORATED

Inventor： Mertel, Michael E. ,  Thomas, James E.

IPC: G06K7/14 ,  G06K7/016

CPC classification number: G06K7/14

Abstract: Scanned barcodes represented by an electrical signal are preprocessed in a PLA and delivered to a microprocessor in a form that permits efficient final processing of the data. High speed edge detection produce edge markers for the control logic and counting circuits coupled with a Johnson state counter to logically sequence the processor. Logarithmic conversion compresses the counted time interval to a single data word that can most efficiently be processed by the host microprocessor. Logic between the preprocessor and the microprocessor transfer digital representations of each bar and space to preassigned respective areas in the microprocessor memory. Bar/space margin detection performs a ratiometric comparison of each bar and space to determine every occurrence of 10:1 ratios of both bar/space and space/bar. Pointer signal information is transferred to the microprocessor indicating precisely where in memory each 10:1 margin ratio is located. A digital filter excludes spurious bar/space width in the preprocessor.