Lecture #17 - The Power Spectrum

Question 1

What does the power spectral density tell us?

Answer 1

Shows how the power in the signal is distributed over the entire frequency spectrum

Question 2

What type of analysis is a spectogram?

Answer 2

A time-frequency analysis

Question 3

The power spectral density of a wide-sense stationary random process is given by what?

Answer 3

Is given by the FT of the autocorrelation

Question 4

Explain what white noise is

Answer 4

1. Special random process
2. Equal intensity at all frequencies
3. Flat PSD

Question 5

Explain the other types of noise such as pink noise and brown noise

Answer 5

1. Pink noise; power per octave is inversely proportional to the frequency
   - Frequency increases, the power increases.
2. Brown noises; decrease by 6dB per octave as the frequency increases.

Question 6

What is a periodogram

Answer 6

An estimation of the PSD of a signal from a single sequence of a process.