Adaptive dual range analog to digital converter
AssigneeEastman Kodak Company
InventorBruce C. McDermott
Life of this patent
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Abstract
An adaptive dual range analog to digital converter particularly adaptive for use with film scanners employs a set-up parameter input arrangement for receiving externally generated control signals for adjusting the digital quantization step size of the analog to digital converter to compensate for quantization errors. According to a further embodiment of the present invention, the adaptive dual range analog to digital converter further includes an input signal range selection device for selecting a segment of the input analog signal to be converted to digital form using fine resolution quantization.
Claims19
An adaptive dual range analog to digital converter comprising:
- an input circuit for receiving an input analog signal to be digitalized;
- a coarse resolution quantization analog to digital converter connected to said input circuit for receiving the input analog signal therefrom, and having a set digital quantization step size, for providing a digital word output;
- a fine resolution quantization analog to digital converter connected to said input circuit for receiving the input analog signal therefrom, and having an adjustable digital quantization step size, for providing a digital word output and including an input signal range selection means for selecting a segment of the input analog signal to be converted to digital form by the fine resolution quantization analog to digital converter;
- an output circuit for outputting a digital word based on the digital word outputs received from at least one of the fine and coarse resolution quantization analog to digital converters, the digital word being representative of the input analog signal received at the input circuit;
- and
- set-up parameter input means for receiving externally generated control signals for controlling the adjustment of the digital quantization step size of the fine analog to digital converter, for controlling the selection of the segment of the input analog signal to be converted by the fine resolution analog to digital converter, and for controlling the digital word outputted by the output circuit.
An adaptive dual range analog to digital converter comprising:
- an input circuit for receiving an input analog signal to be digitalized;
- a coarse resolution quantization analog to digital converter connected to said input circuit for receiving the input analog signal therefrom, and having a set quantization step size for providing a digital word output;
- a fine resolution quantization analog to digital converter connected to said input circuit for receiving the input analog signal therefrom, and having an adjustable digital quantization step size, for providing a digital word output;
- an output circuit for outputting a digital word based on the digital word outputs received from at least one of the fine and coarse resolution quantization analog to digital converters, the digital word being representative of the input analog signal received at the input circuit;
- and
- set-up parameter input means for receiving externally generated control signals for controlling the adjustment of the digital quantization step size of the fine analog to digital converters and for controlling the digital word outputted by the output circuit.
Dependencies are inferred from the claim text.