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Equation 5 · Part 6 · How Edge AI Electronics and Sensor Systems Actually Work

subscript

Einference=Pactive⋅tactiveE_{\text{inference}} = P_{\text{active}} \cdot t_{\text{active}}
subscript

What this part means

The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.

Its job in the formula

A subscript distinguishes a version, component, step, or member of a quantity. It does not automatically mean multiplication.

The passage around this formula

Once a signal has been conditioned, digitized and gated by an appropriate wake mechanism, the question becomes what a microcontroller-class processor can actually afford to compute with the power that remains. A useful way to make this concrete rather than hand-wavy is a simple energy identity: the energy an inference actually costs is Einference=Pactive⋅tactiveE_{\text{inference}} = P_{\text{active}} \cdot t_{\text{active}}. and the sustainable average power of an always-on system operating at duty cycle d (the fraction of time spent active rather than in a low-power sleep state) is

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Learn the underlying idea

A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

Open the illustrated subscripts: which member of a family? guide →

Sources cited in the article section

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