Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1995-05-12
1997-02-25
Gaffin, Jeffery A.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341155, 341158, H03M 146
Patent
active
056063210
ABSTRACT:
A signal-processing circuit has the first reference-voltage setting circuit for setting a lower-limit reference voltage and an upper-limit reference voltage for the first A/D converter, a data-storing section for storing digital data obtained by the first A/D converter, and the second reference-voltage setting circuit for setting a lower-limit reference voltage for the second A/D converter to a voltage that is lower than the voltage corresponding to the digital data stored in the data-storing section and that is higher than the lower-limit reference voltage set by the first reference-voltage setting circuit, as well as for setting an upper-limit reference voltage for the second A/D converter to a voltage that is higher than the voltage corresponding to the digital data stored in the data-storing section and that is lower than the upper-limit reference voltage set by the first reference-voltage setting circuit. Thus, the signal-processing circuit releases digital data based on the data obtained by the second A/D converter. This arrangement makes it possible to convert the analog data released from the line sensor into digital data at high speeds with high resolution and release the resulting data.
REFERENCES:
patent: 4503467 (1985-03-01), Ida et al.
patent: 4583223 (1986-04-01), Inoue et al.
Conlin David G.
Gaffin Jeffery A.
Michaelis Brian L.
Sharp Kabushiki Kaisha
Vick Jason H.
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