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US 5,670,771 AGranted
Apparatus for reading a bar code
AssigneeFujitsu Limited
InventorsMitsuo Watanabe, Shinichi Sato, Ichiro Shinoda
Life of this patent
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Abstract
A DMA controller DMA-transfers a bar width data set generated by a bar width counter to an external RAM. The DMA controller simultaneously DMA-transfers the bar width data set written in the external RAM to an internal RAM. An MPU reads the bar width data set written in the internal RAM at a high speed and demodulates the read bar width data set between the reading processes.
Claims7
A bar code reading apparatus comprising:
- bar width data generating means for detecting widths of respective bars of a bar code and generating bar width data corresponding to the widths of the respective bars;
- a low-speed memory to which the bar width data generated by said bar width data generating means are transferred;
- a high-speed memory to which the bar width data transferred to said low-speed memory are further transferred;
- and
- a demodulation device for reading the bar width data transferred to said high-speed memory and demodulating the bar width data into corresponding data.
2 more elements
Dependencies are inferred from the claim text.