Data acquisition system
First Claim
Patent Images
1. A data acquisition system using an A/D converter comprising:
- a log amplifier which amplifies an inputted analog signal with a nonlinear input-output characteristic;
an A/D converter which samples an output signal from the log amplifier;
a table memory including a correspondence table of address and voltage value data with a linear scale, which reverse-log-converts the sampled signal from the A/D converter to a voltage value data based on the correspondence table; and
an addition memory which stores the data converted to the linear scale while adding the same.
2 Assignments
0 Petitions
Accused Products
Abstract
In a data acquisition system of ADC system, a log amplifier is provided at the pre-stage of an A/D converter, a signal amplified by the log amplifier having a nonlinear input-output characteristic is A/D-converted, and an adding operation of data is performed while reconverting a voltage value data which is converted to a nonlinear characteristic to data with a linear scale according to a table memory for reverse-log conversion. A known voltage value is inputted into the log amplifier to perform measurement, and calibration of the table memory is performed by storing the voltage value and the voltage value data after A/D-converted.
14 Citations
10 Claims
-
1. A data acquisition system using an A/D converter comprising:
-
a log amplifier which amplifies an inputted analog signal with a nonlinear input-output characteristic; an A/D converter which samples an output signal from the log amplifier; a table memory including a correspondence table of address and voltage value data with a linear scale, which reverse-log-converts the sampled signal from the A/D converter to a voltage value data based on the correspondence table; and an addition memory which stores the data converted to the linear scale while adding the same. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification