acoustics worksheet Flashcards
frequency
physical
Hz
oscilloscope
intensity
physical
dB
sound level meter
pitch
perceptual (frequency)
Mel
mel scale
loudness
perceptual (intensity)
Phon/Sone
loudness contour curve
low frequency
long wavelength
high frequency
short wavelength
consonants
help understand speech
vowels
help hear speech
Fourier theory
any complex waveform can be decomposed into a set of sine waves having a particular amplitude, frequency, and wavelength
fundamental frequency
lowest frequency
waveforms limitation
only one tone at a time
waveforms frequency
of cycles occurring per second
waveforms intensity
measure of maximum displacement from baseline (top of curve)
waveforms time
x-axis
spectrogram frequency
y-axis
low frequency at bottom
high frequency at top
spectrogram intensity
darkness of spectrogram at particular frequency
brighter represent higher
spectrogram time
x-axis
spectrum envelope frequency
x-axis
spectrum envelope amplitude
y-axis
spectrum envelope limitation
does not display time
snapshot in time
1000 hz - 3000 hz
where most speech lies and where we hear best
most accurate perception correlation between intensity and loudness
sound filter theory
explains speech production
human speech sounds have a source (vocal folds) and the filtering of these sounds by the vocal tract
resonance
occurs when a tuning fork is exposed to a sound wave at its natural frequency causing it to vibrate strongly
damping
reducing amplitude of vibrations through air resistance
Fourier theories
explains how the forks vibrations produce a fundamental frequency and harmonics that contribute to overall sounds
