Midterm 2 Flashcards
What is the difference between a simple wave and a complex wave?
A simple wave is a sine wave
A complex wave is 2 or more sine waves
Simple Wave
-one sine wave
-one frequency
-aka pure tone
Complex Wave
-adding 2 or more sine wave components together
Waveform synthesis
-adding 2 sine waves together thus synthesizing a wave form
What is a fourier analysis?
-process when you can break down a complex wave (periodic or aperiodic) into its individual sine wave components
What is a fourier series?
-series of sine waves that got added together to produce the complex wave
What is an aperiodic complex wave?
-wave that does not have any repetitive pattern
What is a periodic wave?
-wave that has a repetitive pattern
T/F all complex waves can be described as a sum of simple sine waves
-true
What is a periodic complex wave?
-any wave with a regulating repeating pattern that is not a single sine wave
Definition of aperiodic complex waves?
-there is no fundamental frequency and there are no harmonics
The frequency components of a complex periodic wave often have a _____ to the lowest frequency component.
-harmonic relation
T/F: Frequency components of a complex periodic wave have to have a harmonic relation to the lowest frequency component
-false
-they dont HAVE to
What is the fundamental frequency?
F0 of a complex periodic wave is the frequency that all the other frequencies are multiples of
T/F: The fundamental frequency is always the lowest frequency component of a complex wave?
False, it is usually the lowest frequency component component of a complex. But, your brain can fill in the missing fundamental
Example: 200,500,700,900
F0= 100
What are harmonics?
-The integer multiple of the fundamental
T/F: A complex wave does not need to have all the harmonics of the F0, it can be just some.
True
What are overtones?
-Any harmonic above the fundamental
-First overtone is the second harmonic
What is a partial?
-Any of the frequency components of a complex wave
What is the domain and range of a waveform?
-domain: time
-range: amplitude
What is the domain and range of a spectrum?
-domain: frequency
-range: amplitude
Can a waveform or a spectrum tell you which frequencies are present?
Spectrum
What kind of harmonics do saw tooth waves have?
-even and odd harmonics
In sawtooth waves, what is the relationship between harmonics and amplitude?
-As the harmonics increase, the amplitude decreases
-A=1/H
-6dB per octave
What kind of harmonics do square waves have?
odd harmonics
In square waves, what is the relationship between harmonics and amplitude?
-As the harmonics increase, the amplitude decreases
-A=1/H
-6dB per every octave
What kind of harmonics do triangle waves have?
odd harmonics
In triangle waves, what is the relationship between amplitude and harmonics?
-As the harmonics increase, the amplitude decreases
-A=1/H^2
-12dB drop off per every octave
Do successive amplitudes drop off further in square waves or triangle waves?
triangle waves