Chapter 2. Signal Prosessing

Front 1

What is LTI system?

Back 1

Linear, time-invariant system (LTI-system)

Superposition law:
Every linear combination x(t) of input signals leads to a linear combination y(t) of the output signals.

Rule of shift:
The form of the output signal is independent of the reference date of the input signal.

Front 2

Which transformation can be used to analyze a periodic analog signal?

Back 2

Fourier series

Front 3

Which transformation can be used to analyze a non-periodic analog signal?

Back 3

Fourier transformation

Front 4

How do you call the probability that a random variable is below a defined threshold?

Back 4

Cumulative distribution function

Front 5

How do you call the probability that a random variable is in a certain value interval?

Back 5

Probability density function

Front 6

How do we calculate Joint distribution function and Joint probability density function?

Back 6

Front 7

How do we calculate expected value?

Back 7

Front 8

What is ACF and how do we calculate it?

Back 8

Autocorrelation is the cross-correlation of a signal with itself.

Front 9

Properties of the Fourier transform

Back 9

Front 10

What are the advantages and disadvantages of digital compared to analog signals?

Back 10

Advantages:
- Robustness against distortions: in principle lossless
- Universality: Transmitting different signals over the same channel
- Simple processing on digital computers
Disadvantages:
- Quantization error due to limited number of values
- Higher bandwidth due to sampling with (at least) double frequency

Front 11

Which transformation can be used to analyze a non-periodic discrete signal?

Back 11

Fourier transform of a discrete signal

Front 12

Which transformation can be used to analyze a periodic discrete signal?

Back 12

Discrete Fourier Transform (DFT)

Front 13

What is speech signal distribution like?

Back 13

Combination of Gauss and Laplace distribution