week 6 Flashcards
Good data is produced how
quiet environment, microphone, no clipping (bringing signal in at too high of a level) and a proper sampling rate
sound is dependent on what type of molecule
air, sound is the product of air molecule movement
acoustic analysis
non invasive, looking at the waves our sound produces, analyze what manners of articulation produced the sound, from a microphone
a disordered voice is caused by a change in ________
source, the larnyx, and vocal folds
a disordered articulation is caused by a change in _______
filters, our tounge, pallates (hard and soft), teeth etc
what it motor equivalence of speech
some vocal sounds, can be produced by different articulatory movements, and acoustic analysis cannot see that
what is a limitation of acoustic analysis?
motor equivalency of speech, it cannot capture everything. we cant see how their articulators moved from a voice recording.
what is a filter in regards to recording waves
selects specific frequencies within a complex wave for further subsequent analysis, looks at all the frequencies like a prisim, ingredients
high pass filter does what to an acoustic recording
allows high frequencies through and blocks out lower frequencies or holds them back
low pass filter does what to an acoustic recording
allows low frequencies through and blocks out higher frequencies or holds them back
band pass filter does what to an acoustic recording
allows a specific set range of frequencies through, and can hold back higher or lower frequencies
band reject filter does what to an acoustic recording
holds back or blocks out a specific set range of frequencies, and can allow both higher or lower frequencies to go through
what is a fourier theorem
all periodic sounds are made up of a combination of sine waves
how do we changing domains? apply a ______ ________
fourier transform , creates a spectrum of all the different parts of a wave from a microphone signal a time display, or time domain waveform (y is amplitude, x is time). analyzes to create a spectra of all the individual components. takes a time domain display and transforms it into a frequency domain display (y amplitude , x is frequency)
time domain display
a microphone recording
frequency domain display
a spectrum, a slice in time or, snapshot in time of the frequency of a wave
harmonics are exact multiples of the _______
fundamental
sound source comes from our____
larnyx (voice box) , vocal folds,
the human voice is nearly ________
periodic, almost repeats in cycles perfectly. Contains normally small amounts of perturbation, without perturbation (shimmer and jitter) our voices would sound artificial. has harmonics and a fundamental
spectra represents what
frequency components that are present within a sound
sine wave will have how many lines in a spectra display?
one
complex periodic signals have multiple lines in a spectra display, true or false?
true
spectral envelope does noise look like in a spectral display
all different frequencies, with different phase relationships to one another, with approximately equal amplitude. vertical lines very close set together.
spectra envelope
space not filled in under neath spectral peaks, takes away vertical lines that represent individual sine waves.
