Chapter 11 Questions
2. What is a pixel ?
A sample point in a 2 dimensions of a 2-dimensional signal.
4. What is a spatial frequency ? How is it dened ?
The amount of pixels per unit of length, fsx = 1/x, analogous for y
5. What does the 2-dimensional sam

Chapter 7 Questions
1. An FIR filter is a linear discrete-time system with an impulse response of finite length.
2. A causal time-invariant FIR filter of order N can be described by a difference equation
of the type of equation 7.1. Parameters bn are call

Chapter 10 Questions
1. In which respect do adaptive lters dier from classical lters ?
They autonomously adjust their coefficients to the surrounding environment in order to offer (nearly) optimal performance at
each moment in time. Classic filters have f

Chapter 8 Questions
1. What is a real-time system ? Keep in mind real-time behavior and processing delay are distinct features.
The sampling rate at the input and at the output is the same, whenever it fulfills the timeliness property (system fast enough)

Chapter 5 Questions
2. What is the dierence between sample-based and frame-based (also called blockbased) data transfer ?
Sample based: isolated packets of one passing
frame based(block based): multiple samples per timeunit
3. What is a (non-)stationary s

Chapter 9 Questions
1. Which assumptions are made about the course of the signal outside the frame x[k] in case a DTFT, a DFT or a DCT
is employed ?
DTFT: the signal is assumed to be zero outside the frame
DFT (FFT): x[k] is assumed periodically repeated

Chapter 6 Questions
2. What is a linear system ? Give an example of a linear discrete-time system. Recall that linear continuous-time
(analog) systems do not exist in practice.
A system is said to be linear if a linear combination of signals at the input