公开(公告)号：US3706887A

公开(公告)日：1972-12-19

申请号：US3706887D

申请日：1971-03-04

Applicant: IBM

Inventor： BICKFORD JEROME R ,  NICHOLSON JAMES O

IPC: G06K7/016 ,  G08C9/06

CPC classification number: G06K7/016

Abstract: The optical reader of the invention uses a discrete number of pulses to time the passage of each column position, samples hole data at four selected count positions and interrogates the samples to ascertain whether the condition of the samples indicates the presence or absence of data or an error condition. When valid data is sensed by data indications adjacent one end of the sample sequence, the interpreting circuit also indicates whether the presence of the hole occurred early or late with respect to nominal timing. In addition mark read data may be read at the same read station using selected samples that are interpreted as presence or absence of data or an error condition using the same interpreting circuitry.

Abstract translation: 本发明的光学读取器使用离散数量的脉冲来对每个列位置的通过进行时间，在四个选定的计数位置处采样孔数据并询问样本以确定样本的条件是否表示数据的存在或不存在 错误条件 当通过与样本序列的一端相邻的数据指示来感测有效数据时，解释电路还指示孔的存在是否相对于标称定时早或晚发生。 另外标记读取数据可以使用被解释为存在或不存在数据的选定样本在同一读取站读取，或者使用相同的解释电路读取错误条件。

公开(公告)号：CA981792A

公开(公告)日：1976-01-13

申请号：CA135660

申请日：1972-02-28

Applicant: IBM

Inventor： BICKFORD JEROME R ,  NICHOLSON JAMES O

IPC: G06K7/016

Abstract: The optical reader of the invention uses a discrete number of pulses to time the passage of each column position, samples hole data at four selected count positions and interrogates the samples to ascertain whether the condition of the samples indicates the presence or absence of data or an error condition. When valid data is sensed by data indications adjacent one end of the sample sequence, the interpreting circuit also indicates whether the presence of the hole occurred early or late with respect to nominal timing. In addition mark read data may be read at the same read station using selected samples that are interpreted as presence or absence of data or an error condition using the same interpreting circuitry.