pre - emphasis and de-emphasis

What is pre-emphasis?

• a. A technique used to boost low frequency components of a signal
• b. A technique used to boost high frequency components of a signal
• c. A technique used to remove low frequency components of a signal
• d. A technique used to remove high frequency components of a signal

What is the main purpose of pre-emphasis?

• a. To reduce the noise in the signal
• b. To reduce the dynamic range of the signal
• c. To boost the high frequency components of the signal
• d. To boost the low frequency components of the signal

What is the formula for pre-emphasis filter?

• a. y(t) = x(t) - αx(t-1)
• b. y(t) = x(t) + αx(t-1)
• c. y(t) = x(t) - αy(t-1)
• d. y(t) = x(t) + αy(t-1)

Why is pre-emphasis necessary in speech processing?

• a. To reduce the noise in the signal
• b. To improve the signal-to-noise ratio (SNR)
• c. To make the speech signal easier to compress
• d. To make the speech signal sound more natural

How does pre-emphasis affect the spectral shape of a speech signal?

• a. It boosts the high frequency components, making the spectral shape flatter
• b. It boosts the high frequency components, making the spectral shape steeper
• c. It boosts the low frequency components, making the spectral shape flatter
• d. It boosts the low frequency components, making the spectral shape steeper