Method for synchronizing scanning speed and data transmission speed of a scanner

摘要

A method for synchronizing scanning speed and data transmission speed of a scanner to eliminate a traditional memory buffer is disclosed. The scanner is connected to a host computer and comprises a charge coupled device (CCD) for converting a line image reflected from a document to be scanned into an array of analog signals. The CCD comprises an analog memory array for storing the analog signals. The method comprises the following steps of: a) outputting an analog signal from the analog memory array; b) converting the analog signal to a digital signal and transmitting the digital signal to the host computer; c) waiting until the host computer acknowledges receiving of the digital signal; and d) repeating steps a) to c) until all the analog signals stored in the analog memory array are processed and transmitted to the host computer.