Lecture 1 Flashcards
Define frequency
the amount of times in 1 sec that compression changes to rarefaction
Define fundamental freq.
the main of primary vibration frequency in a periodic sound
Define periodic
a regular or repeating patter of rarefaction because the mechanical sound source is vibrating/oscillating at a very regular rate
Define aperiodic
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/
define Complex wave
has more than one frequency, all sounds that are naturally occurring are complex waves of particular frequencies
Define simple sound
AKA Pure or Sine (sinusoidal) tones. Consist of only one frequency. Used for Ax of hearing thresholds, can only be generated electronically
Define wave length
the distance travelled by one cycle of the wave form.
Wavelength = velocity/frequency
Define Phase
starting point of a cycle of a tone or frequency with respect to another tone
Define Amplitude
the amount of change in the air pressure, that is, the amount of displacement of air particles from their point of equilibrium
Define Pascals
the units of measurement for pressure
Define decible sound pressure level (SPL)
Pascals or dynes/cm2. More commonly used
Define decible intensity level (IL)
Watts/cm2, double sound pressure the intensity is quadrupled
Define spectral analysis
analyses any complex function, such as sound wave into its simple sinusoidal components
Define harmonics
frequencies that are multiples of the fundamental frequency. Higher the step in the harmonic series the lower the amplitude
Define pitch
= fundamental frequency.
