Howtosignalprocessing
What is direct digital frequency synthesizer?
Direct digital frequency synthesis (DDFS) is a method of producing an analog waveform—usually a sine wave— by generating a time-varying signal in digital form and then performing a digital-to-analog conversion.
What is DDS technology?
Direct digital synthesis (DDS) is a technique for using digital data processing blocks as a means to generate a frequency- and phase-tunable output signal referenced to a fixed-frequency precision clock source.
Are negative frequencies real?
The meaning of negative frequencies is just mathematical(not physical) similarly to the imaginary part of a complex signal. In real world, the negative frequency does not exists and the spectral content on negative frequencies must be added to the spectral content at the positive frequencies, to save energy.
