Digitized video signal and time interval measurement transmission from a bar code reader

• US 4,902,883 A
• Filed: 01/28/1988
• Issued: 02/20/1990
• Est. Priority Date: 01/28/1988
• Status: Expired due to Fees

• Current Assignee: HP Inc.
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Poland, Mckee D.
• Primary Examiner(s): TRAFTON, DAVID
• Application Number:
  US07/149,453
• Time in Patent Office: 754 Days
• Field of Search: 235/462, 235/470, 235/472
• US Class Current: 235/462.15
• CPC Class Codes: G06K 17/0022 arrangements or provisious for transferring data to distant stations, e.g. from a sensing device "transfer between computer elements G06F13/00 "; data-transmission H04L

Abstract

A bar code reader comprises a smart scanner with a processor that can be configured to send to the host either (a) the digitized video signal from the scanner'"'"'s optical section, (b) the unprocessed time interval data measured from the transitions of the video signal, (c) the decoded data message, or (d) the combination of (b) and (c).

Claims

1. A bar code reader for scanning data from bar codes for input to a host computer system, comprising:

means for producing a digitized video signal representing the reflectivity of the bars and spaces of the bar code;

decoding means for receiving the digitized video signal, for measuring the pulse widths of the video signal that correspond to the widths of the bar and space elements of the bar code to produce element time interval data, and for translating the time interval data into decoded ASCII characters; and

means for transmitting data to a host computer system, the transmitting means having an adjustable configuration that determines whether the digitized video signal, the element time interval data, the decoded ASCII characters, or a combination thereof, is transmitted to the host system.

5. The reader of claim 1 wherein the decoding means includes means for scaling and compensating the element time interval data to remove acceleration effects and to express the data as single byte values before the element time interval data is decoded into ASCII characters or transmitted to the host computer system.

2. The reader of claim l wherein the decoding means comprises a processor and the configuration of the processor determines whether the digitized video signal, the element time interval data, the decoded ASCII characters, or combinations thereof, are transmitted to the host system.

3. The reader of claim 2 wherein the configuration of the processor is set by commands received from the host computer system.

4. The reader of claim 2 wherein the configuration of the processor is set by scanning bar code labels containing configuration commands.

6. The reader of claim 2 wherein the decoding means includes means for scaling and compensating the element time interval data to remove acceleration effects and to express the data as single byte values before the element time interval data is decoded into ASCII characters or transmitted to the host computer system.

7. A bar code reader for scanning data from bar codes for input to a host computer system, comprising:

optical sensor means for producing an analog signal modulated by the passing of bars and spaces on a bar code label, representing the reflectivity of the bars and spaces of the bar code label;

digitizer means for receiving and amplifying the analog signal from the optical sensor means, and converting the analog signal into a digitized video signal;

decoding means for receiving the digitized video signal from the digitizer means, for measuring the pulse widths of the video signal that correspond to the widths of the bar and space elements of the bar code to produce element time interval data, and for translating the time interval data into decoded ASCII characters; and

means for transmitting data to a host computer system, the transmitting means having an adjustable configuration that determines whether the digitized video signal, the element time interval data, the decoded ASCII characters, or a combination thereof, is transmitted to the host system.

8. The reader of claim 7 wherein the decoding means comprises a processor and the configuration of the processor determines whether the digitized video signal, the element time interval data, the decoded ASCII characters, or combinations thereof, are transmitted to the host system.

9. The reader of claim 8 wherein the configuration of the processor is set by commands received from the host computer system.

10. The reader of claim 8 wherein the configuration of the processor is set by scanning bar code labels containing configuration commands.

11. The reader of claim 7 wherein the decoding means includes means for scaling and compensating the element time interval data to remove acceleration effects and to express the data as single byte values before the element time interval data is decoded into ASCII characters or transmitted to the host computer system.

12. The reader of claim 8 wherein the decoding means includes means for scaling and compensating the element time interval data to remove acceleration effects and to express the data as single byte values before the element time interval data is decoded into ASCII characters or transmitted to the host computer system.