Difference between these two digital down conversion methods

1. What is DDC and ADC?
2. What does digital down converter do?
3. What is downconverting?
4. What is digital up converter?

What is DDC and ADC?

Digital radio receivers often have fast ADC converters delivering vast amounts of data; but in many cases, the signal of interest represents a small proportion of that bandwidth. A DDC allows the rest of that data to be discarded, allowing more intensive processing to be performed on the signal of interest.

What does digital down converter do?

In digital signal processing, a digital down-converter (DDC) converts a digitized, band-limited signal to a lower frequency signal at a lower sampling rate in order to simplify the subsequent radio stages. The process can preserve all the information in the frequency band of interest of the original signal.

What is downconverting?

Noun. downconversion (countable and uncountable, plural downconversions) (physics) The interaction of a photon with a medium in which it is converted into two photons of lower frequencies such that energy is conserved. (electronics) The conversion of a high radio frequency to a lower frequency.

What is digital up converter?

In digital up-conversion, baseband signals are interpolated to intermediate frequency (IF), then digitally modulated by IF sinusoidal carriers. According to the Nyquist theory, the IF carrier frequency is limited to half of the IF circuits sampling frequency.