= Negative frequency
{wiki=Negative_frequency}
Negative frequency is a concept that arises in signal processing and communications, particularly in the analysis of signals in the frequency domain through techniques such as the Fourier transform. 1. **Signal Representation**: When a real-valued signal is transformed into the frequency domain using the Fourier transform, it can be represented by complex exponentials of the form \\( e^\{j \\omega t\} \\), where \\( \\omega \\) is the angular frequency. In this context, both positive and negative frequencies are present.
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