COMD 5070 Exam 3 (Latest 2023/ 2024 Update) Acoustics of Speech and Hearing| Questions and Verified Answers| 100% Correct| Grade A

COMD 5070 Exam 3 (Latest 2023/ 2024

Update) Acoustics of Speech and Hearing|

Questions and Verified Answers| 100%

Correct| Grade A

Q: How to calculate frequency? If there is a period of 2ms (0.002 seconds)?-

Answer:

1/0.002= 500 Hz.

Q: What is a harmonic series?

Answer:

When multiple sine waves or pure tones are combines together.

Q: What are integer multiples?

Answer:

The whole number multiples of whatever the fundamental frequency is.

Q: What is the fundamental frequency?

Answer:

The lowest frequency in a series that we will combine to make a harmonic series.

Q: How does sound transmit when the medium changes?

Answer:

-Sound will travel the most readily through a medium that is continuous, that does not change in

its properties from one place to another.

- Air is a medium.

- Air molecules oscillate with sound.

- Energy transmits through similar mediums.

- Change of medium will change if the sound is reflected or transmitted.

- Talking to a submerged swimmer: medium changed & now you have to speak up, more sound

is being reflected than transmitted.

- Reflection can happen where tube size changes.

Q: How are decibels added?

Answer:

You always go up 6 dB when you add two identical intensities.

Q: What is 20 dB + 20 dB?

Answer:

26 dB.

Q: What is 50 dB + 50 dB?

Answer:

56 dB.

Q: What is an octave?

Answer:

A doubling of Hz.

Q: How many semitones are there per octave?

Answer:

12.

Q: What is happening when you go from 400 Hz to 800 Hz?

Answer:

Going up one octave.

Q: What happens when you go up and down octaves?

Answer:

The mathematical relationship between the frequency changes.

Q: Note pairs blend one of two ways. What are these two ways?

Answer:

- Harmonious- ly.

- Dissonantly.

Q: If there are 12 semitones between 100 Hz and 200 Hz, how many semitones would there be

between 500 Hz and 4000 Hz?

Answer:

- You first have to determine how many octaves there are, then multiply by 12 to get the

semitones.

- 36.

Q: What are the three things one should know about the 12 notes between octaves?

Answer:

- Each step in nonlinear.

- Each step upward is bigger than the last (about 5.9% higher in frequency).

- No two semitones are identical; however, they sound equal in step size.