Pressure Waves

In human voice production, what causes the fluctuations in air pressure?

vocal fold vibration

True or False: When we create a sound wave while speaking, the individual air molecules of the sound wave travel from the mouth of the speaker to the eardrum of the listener?

False

What acoustic dimensions are represented in an oscillogram?

frequency, amplitude, wavelength

What is the y-axis and x-axis of an osciligram?

y-axis: amplitude (dB)

x-axis: time

Frequency

cycles per second

Formula for frequency

1/T

Frequency is perceived as

Pitch

If the period of a waveform is 10 ms long what is its frequency?

100 Hz

ms to s

divide by 1,000

If the frequency of a waveform is 200 Hz, what is its period?

0.005 seconds or 5 ms

Amplitude

amount of displacement from the rest position

Amplitude is perceived as

loudness

Peak-to-Peak amplitude

the distance between a maximum and the next minimum

Zero Crossing

the point at which the rest position is reached

Wavelength

distance between two pressure maxima

Speed of sound

340 m/s

Formula for wavelenght

c/f

Assuming that the speed of sound is 340 m/s and the frequency of a waveform is 100 Hz, what is the wavelength?

3.4 m