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Introduction of a phase difference of 180°. Note: Phase inversion may occur with a random or periodic, symmetrical or non-symmetrical waveform, although it is usually produced by the inversion of a symmetrical periodic signal, resulting in a change in sign. A symmetrical periodic signal represented by f (t ) = A ejt , after phase inversion, becomes f 1(t ) = Aej(
t +
), where t is time, A is the magnitude of the vector,
is angular frequency (
= 2
f ), where f is the frequency and
3.1416 and e
2.7183. The algebraic sum of f (t ) and f 1(t ) will always be zero.