Optoelectronic device, process and article for acquiring machine-readable symbols, such as bar codes
First Claim
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1. A method of acquiring a machine-readable symbol using an optoelectronic device, the method comprising:
- scanning the machine-readable symbol with a plurality scanning passes occurring at a scanning frequency;
receiving reflected scans corresponding to the plurality of scanning passes;
converting the reflected scans to an electrical signal;
sampling the electrical signal at a sampling frequency thereby producing data samples associated with corresponding scanning passes;
interleaving data samples associated with at least two of the scanning passes to produce a representation in a memory, wherein the sampling frequency is proportional to the scanning frequency by a quotient of twice a number of samples in the representation and an integer such that the quotient is an irreducible fraction; and
decoding the representation.
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Abstract
A device and a process for acquiring symbols by interleaving data samples in a plurality of data sets gathered during sampling of returns from a plurality of scanning passes. In one embodiment, the sampling frequency is proportional to the scanning frequency by a quotient of twice the number of samples in a representation and an integer such that the quotient is an irreducible fraction.
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Citations
55 Claims
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1. A method of acquiring a machine-readable symbol using an optoelectronic device, the method comprising:
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scanning the machine-readable symbol with a plurality scanning passes occurring at a scanning frequency;
receiving reflected scans corresponding to the plurality of scanning passes;
converting the reflected scans to an electrical signal;
sampling the electrical signal at a sampling frequency thereby producing data samples associated with corresponding scanning passes;
interleaving data samples associated with at least two of the scanning passes to produce a representation in a memory, wherein the sampling frequency is proportional to the scanning frequency by a quotient of twice a number of samples in the representation and an integer such that the quotient is an irreducible fraction; and
decoding the representation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of acquiring a machine-readable symbol using an optoelectronic device, the method comprising:
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scanning the machine-readable symbol with a plurality of scanning passes occurring at a scanning frequency;
receiving reflected scans corresponding to the plurality of scanning passes;
converting the reflected scans to an electrical signal;
sampling the electrical signal at a sampling frequency thereby producing data samples associated with corresponding scanning passes; and
interleaving data samples associated with at least two of the scanning passes to produce a representation in a memory. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An optoelectronic device for acquiring a machine-readable symbol, comprising:
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a beam subsystem configured to generate scanning beam passes at a scanning frequency;
a reception subsystem configured to convert light reflected from the scanning beam passes to an electrical signal;
a sampler configured to sample the electrical signal at a sampling frequency, thereby producing sets of samples associated with corresponding scanning beam passes; and
a memory configured to interleave samples from at least two of the sets of samples, thereby producing a representation in the memory. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A device for acquiring a machine-readable symbol, comprising:
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means for generating a scanning beam at a scanning frequency;
means for converting light reflected from the scanning beam to an electrical signal;
means for sampling the electrical signal at a sampling frequency; and
means for interleaving samples of the electrical signal associated with a plurality of scanning beam passes, thereby producing a representation. - View Dependent Claims (42, 43, 44)
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45. A computer readable memory medium loadable in a memory of a processor of a system, comprising software code portions for causing the system to:
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scan a machine-readable symbol with a plurality of scanning passes occurring at a scanning frequency;
sample, at a sampling frequency, an electrical signal corresponding to light reflected from the plurality of scanning passes, thereby producing samples associated with corresponding scanning passes; and
interleave samples associated with at least two scanning passes, thereby producing a representation in a memory. - View Dependent Claims (46, 47, 48)
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49. A device for acquiring a machine-readable symbol, comprising:
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means for sampling an electrical signal at a sampling frequency, the electrical signal associated with reflected scans of the machine-readable symbol occurring at a scanning frequency;
means for interleaving samples of the electrical signal associated with a plurality of scanning beam passes, thereby producing a representation; and
means for decoding the representation. - View Dependent Claims (50, 51, 52, 53, 54, 55)
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Specification