DC coefficient

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When describing a periodic function in the frequency domain, the term DC coefficient or DC component refers to the mean value of the waveform (possibly scaled according to the norm of the corresponding basis function of the frequency analysis filter bank). The name comes from an analogy to an electrical system in which this coefficient is analogous to a DC voltage or current, whilst the coefficients representing various other frequencies are analogous to superimposed AC voltages or currents.

The term's use is extended to two dimensional transformations like the Discrete cosine transform used in JPEG.

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