Lecture 2

Question 1

Low Pass filter

Answer 1

only allows sound energy at frequency BELOW a certain cut off e.g passes sound below 5kHz

Question 2

High Pass filter

Answer 2

only allows sound every at frequency ABOVE a particular cut off. i.e passes sound above 2500 Hz

Question 3

Band pass filter

Answer 3

combines low pass and high pass filters and transmits sound every only within a particular rand or band.
i.e passing sound below 5kHz and above 2500Hz

Question 4

Bandwidth

Answer 4

range of frequency passes through a filter

Question 5

Describe the effect of changing the bandwidth on the level of frequency and temporal detail obtained from spectral analysis of speech

Answer 5

By adjusting the bandwidth level to narrow (30Hz) to wide bandwidth (500Hz). The detail we obtain from spectral filtering about the specific frequencies present in a sound signal depends upon the bandwidth of filters.

Question 6

The relationship between bandwidth and the temporal window of analysis

Answer 6

…

Question 7

Features that Can/Can’t be seen in narrow-band spectrograms

Answer 7

Can: fundamental frequency and harmonic frequencies

Can’t: Temporal resolution is poor so glottal pulsing is poor

Question 8

Features that Can/Can’t be seen in wide-band spectrograms

Answer 8

Can: Glottal pusling and vowel formants

Can’t: frequency resonation