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DHAI Course 2022 Signal Processing Quiz

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Questions and Answers

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

To filter out high-frequency components from the audio signal
To convert the entire audio signal from the time domain to the frequency domain
To amplify the audio signal for better audibility
To analyze the audio signal in short-time windows and obtain time-frequency representation (correct)

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

It helps to improve the time resolution of the analysis
It reduces the computational complexity of the STFT
It helps to improve the frequency resolution of the analysis
It allows for the analysis of the entire audio signal over time (correct)

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

The frequency value corresponding to that index (correct)
The amplitude of the audio signal at that frequency
The sampling rate of the audio signal
The duration of the audio signal

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

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

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

To visualize the frequency content of the audio signal over time (A) Signup and view all the answers

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

Larger window size improves frequency resolution but decreases time resolution (B) Signup and view all the answers

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

To identify regions of high energy or low energy in the audio signal (D) Signup and view all the answers

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

To identify voiced and unvoiced regions in speech signals (B) Signup and view all the answers

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

To represent the energy distribution of the audio signal across frequencies (A) Signup and view all the answers

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

They are inversely proportional to each other (A) Signup and view all the answers

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