10 Questions
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# DHAI Course 2022 Signal Processing Quiz

Created by
@QuietDjinn

## Questions and Answers

### What is the purpose of the Short-Time Fourier Transform (STFT)?

To analyze the audio signal in short-time windows and obtain time-frequency representation

### What is the significance of shifting the window in the STFT process?

It allows for the analysis of the entire audio signal over time

### In the context of the Fourier transform, what does the frequency index 'k' represent?

The frequency value corresponding to that index

### What is the relationship between the frequency index 'k' and the corresponding frequency value?

<p>The frequency value is equal to k * (sampling rate / N)</p> Signup and view all the answers

### What is the purpose of the spectrogram representation obtained from the STFT?

<p>To visualize the frequency content of the audio signal over time</p> Signup and view all the answers

### What is the trade-off involved in choosing the window size for the STFT?

<p>Larger window size improves frequency resolution but decreases time resolution</p> Signup and view all the answers

### What is the purpose of calculating the short-term energy in audio signal analysis?

<p>To identify regions of high energy or low energy in the audio signal</p> Signup and view all the answers

### What is the purpose of calculating the zero-crossing rate in audio signal analysis?

<p>To identify voiced and unvoiced regions in speech signals</p> Signup and view all the answers

### What is the purpose of the magnitude spectrum obtained from the Fourier transform?

<p>To represent the energy distribution of the audio signal across frequencies</p> Signup and view all the answers

### What is the relationship between the time resolution and the frequency resolution in the STFT?

<p>They are inversely proportional to each other</p> Signup and view all the answers

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