Noise spectra suppression method, by transforming to higher frequency range using mixer and filter, and transforming back to lower frequency range by frequency division

摘要

In a first step, a direct digital synthesizer (DDS) signal (S2) is transformed into a higher frequency range. In a second step, the signal is transformed back to a lower frequency range. The transformation to the higher frequency range is performed using a mixer (10) and a filter (11). The transformation back to lower frequency is performed by frequency division (12). An Independent claim is included for an apparatus for suppressing noise spectra.