Acoustic Phonetics

Question 1

Sounds

Answer 1

Movement changes surrounding air pressure which is perceived as sound

Question 2

Wave

Answer 2

Transmission of energy in the form or compression (increases pressure) and rarefaction (decreases pressure)

Question 3

Waveforms

Answer 3

Graphical representations of air pressure variation in one place over time

Amplitude over time

Question 4

Frequency

Answer 4

Number of cycles completed in one second
Measured in Hertz
Perceived as pitch

Question 5

Amplitude

Answer 5

Divergence form normal atmospheric pressure

Perceived as loudness

Question 6

Periodic waveform

Answer 6

Vocal folds vibrate producing a repeated pattern

Question 7

Aperiodic waveform

Answer 7

Turbulence created in fricatives showing not clear pattern

Question 8

Transient waveform

Answer 8

Air is trapped then released in plosives giving a brief period of noise

Question 9

Fourier analysis

Answer 9

Complex periodic waves can be decomposed into simple component waves

Question 10

Spectrum

Answer 10

Represents amplitude over frequency

Question 11

Spectrograms

Answer 11

Shows how spectra - frequency and amplitude - change over time