Lecture 1

Question 1

Define frequency

Answer 1

the amount of times in 1 sec that compression changes to rarefaction

Question 2

Define fundamental freq.

Answer 2

the main of primary vibration frequency in a periodic sound

Question 3

Define periodic

Answer 3

a regular or repeating patter of rarefaction because the mechanical sound source is vibrating/oscillating at a very regular rate

Question 4

Define aperiodic

Answer 4

produced by a technical sound source that has no regular or oscillating moment e.g. a radio that is not tuned in a radio station or a voiceless fictive /sh/

Question 5

define Complex wave

Answer 5

has more than one frequency, all sounds that are naturally occurring are complex waves of particular frequencies

Question 6

Define simple sound

Answer 6

AKA Pure or Sine (sinusoidal) tones. Consist of only one frequency. Used for Ax of hearing thresholds, can only be generated electronically

Question 7

Define wave length

Answer 7

the distance travelled by one cycle of the wave form.

Wavelength = velocity/frequency

Question 8

Define Phase

Answer 8

starting point of a cycle of a tone or frequency with respect to another tone

Question 9

Define Amplitude

Answer 9

the amount of change in the air pressure, that is, the amount of displacement of air particles from their point of equilibrium

Question 10

Define Pascals

Answer 10

the units of measurement for pressure

Question 11

Define decible sound pressure level (SPL)

Answer 11

Pascals or dynes/cm2. More commonly used

Question 12

Define decible intensity level (IL)

Answer 12

Watts/cm2, double sound pressure the intensity is quadrupled

Question 13

Define spectral analysis

Answer 13

analyses any complex function, such as sound wave into its simple sinusoidal components

Question 14

Define harmonics

Answer 14

frequencies that are multiples of the fundamental frequency. Higher the step in the harmonic series the lower the amplitude

Question 15

Define pitch

Answer 15

= fundamental frequency.

Question 16

Psychological correlate of fundamental frequency and scale

Answer 16

= pitch (Mels)

Question 17

Define Loudness

Answer 17

= amplitude

Question 18

Psychological correlate of amplitude and scale

Answer 18

= Loudness (Sone)

Question 19

1. Frequency of Human hearing abilities
2. Frequency of human speech
3. Quiet breathing (dB)
4. Whispering
5. Conversation
6. Loud Rock Concert

Answer 19

1. 20-20,000 Hz
2. 100-10,000 Hz
3. 0 dB threshold of human hearing
4. 30 dB
5. 60 dB
6. 120 dB threshold of pain