AC-coupled
A circuit that eliminates the DC offset voltage of the signal. This circuit is
typically used with frequency inputs that have a DC offset. Note that the DC
offset value varies by product.
active high
Input type that is on when it reads a battery voltage level, and off when it is
floating or grounded.
active low
Input type that is on when it reads a ground voltage level, and off when it is
floating or connected to battery voltage.
aliasing
In analog-to-digital conversion, distortion that occurs when the analog signal
being sampled has a frequency greater than half the sample rate. An example of
aliasing is the wagon-wheel effect often seen in films, in which a spoked wheel
appears to rotate differently from its true rotation.
amplified
A circuit that applies a gain with a value greater than one (1) to a measured signal,
which is typically used with analog inputs.
analog input
An input that allows a voltage level to be read and converted to discrete digital
values within a microprocessor.
anti-alias filtering
Filters incorporated in hardware that ensure the analog value being read by the
module does not have a frequency component greater than half the sample rate.
application software
A level of software that makes a product (hardware) perform desired functions for
the end user.
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