## ADC- Analog to Digital Converter

A chip that converts analog signals into a sucession of digitial numbers. In constant time intervals the current analog value is acquired and put out as a digital number.

## Costas Loop

A circuit for demodulation of phase-modulated signals.

## DRM Digital Radio Mondial

Transmission system for digital broadcasting.

## FFT Fast Fourier Transformation

Fast method to calculate a spectrum.

## FPGA - Field Programmable Gate Array

Programmable logic chip for the implementation of simple logic circuits as well as complicated processing and even complete CPUs.

## Nyquist-Shannon-Theorem

An analog signal of limited bandwidth can be recovered from discreet samples if the sample rate is at least twice the bandwidth of the signal.

## PDL - Programming by Deleting Lines

A kind of extreme programming where simplicity of program logic is achieved through consistent minimzation of code-entropy.

## PLL - Phase Locked Loop

A control loop in which a local oscillator is adjusted to a reference oscillator in frequency and phase.

## QPSK - Quadrature Phase Shift Keying

Digital modulation process that codes two bits each to four possible phases.

## Simulation - Transpiration - Verification

Classic rule of three in research and development.

## Superconduction

Physical phenomenon in which the electric resistivity of matter disappears.

## Yttrium-Barium-Cuprat YBa_{2}Cu_{3}O_{7-x}

Well-known superconductor - starts superconduction at 93 K.