# Translations:Magnitude spectrum and phase spectrum/23/en

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The *frequency spectrum* (or transfer function) can be written in polar form as , which generally is complex. The magnitude of the transfer function is called the filter’s *magnitude spectrum* (or *amplitude spectrum*), whereas its phase lead is called the *filter’s phase-lead spectrum*. Thus, the magnitude spectrum of the filter is 0.5, and its phase-lead spectrum is .