O (5)

Question 1

What is the Mel-frequency scale used for in acoustic feature extraction?

Answer 1

It provides a perceptual frequency scale that reflects human hearing, especially above 1 kHz

The scale is defined by the formula: SMer = 1127 In(1 + 102)

Question 2

True or false: The ear’s frequency resolution is constant across all frequencies.

Answer 2

FALSE

The ear’s frequency resolution broadens as frequency increases.

Question 3

What happens to the ear’s frequency resolution as frequency increases?

Answer 3

It broadens

This is measured in critical bands.

Question 4

What is the formula for calculating the Mel scale?

Answer 4

SMer = 1127 In(1 + 102)

This formula is used to convert frequency in Hertz to the Mel scale.

Question 5

What does the Mel-scale filter bank simulate?

Answer 5

Characteristic frequencies of nerve fibres

It helps in reducing the effects of frequency perception.

Question 6

Fill in the blank: Human hearing does not perceive frequency _______.

Answer 6

linearly

This non-linear perception is especially significant above 1 kHz.