Correction (By use of data in a Calibration TEDS) 

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Contact:
Kang Lee

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301 975 6602 Telephone
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100 Bureau Drive,
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Gaithersburg, MD 20899-8220

What is correction?

Correction is the application of a specified mathematical function upon transducer data from one or more STIM channels and/or data delivered from other software objects. Correction is intended to reconcile 2 different numbers associated with a transducer channel. These two numbers are:

• NCAP-side number: This number represents the channel's value expressed in the Physical Units recorded in the Channel TEDS. It is used in the NCAP and elsewhere to represent the channel transducer data.
• Transducer-side number: This number is read from or written to the channel hardware.

How is correction applied?

The goal of correction depends on the transducer type.

• For sensors, buffered sensors, data sequence sensors and buffered data sequence sensors, correction takes as input the transducer-side data from an addressed channel, and outputs, the NCAP-side number.
• For actuators, correction takes as input the NCAP-side number for an addressed channel, in other words, the intended next state of the actuator, and outputs the transducer-side number.
• For general transducers, the form and usage of the inputs and outputs are specified by the manufacturers.

What is the correction function?

D (1) D (2) D (n)

... >C _{i, j,...,p}[X₁ – H₁] ⁱ [X₂ – H₂] ^j ... [X_n – H_n] ^p

i = 0 j = 0 p = 0

where the X_k variable (inputs) represent the data from a set of channels (taken from the transducer or NCAP side) and D(k), C _{i, j, ... p} and H_k are data recorded in the Calibration TEDS. D(k) is the degree of input X_k, that is, it is the highest power to which [X_k – H_k] is raised in any term of the multinomial. The degree of each input may differ from another.