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5.1.1.
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Gravity
Terms in this set (18)
Pure tone
A body oscillates sinusoidally, showing only one frequency of vibration with no additional tones superimposed. Tone of only 1 frequency, no harmonics.
What happens when pure tones with the same frequency are combined?
The resulting wave will also be a pure tone of the same frequency. (This will not happen if two pure tones of different frequencies are interacting.)
Complex Tones
Combination of sinusoids where there is more than one frequency present.
Reinforcement/Constructive Interference
Two identical pure tones (same frequency and amplitude) that are in phase with each other are combined, the resultant wave will have the same frequency and an amplitude that is double that of the two waves being combined.
Cancellation/Destructive Interference
Two identical pure tones that are 180* out of phase are combined, their combo results in an amplitude of 0. Same frequencies, different amplitudes.
What does destructive interference do to the intensity?
Decreases it
What happens when two pure tones of the same frequency that are out of phase by a magnitude of other than 180* are combined?
Results in a wave that is the same in frequency, but different in phase and amplitude than the sinusoids being combined. (Some reinforcement, but not a doubling or complete cancellation)
When conducting a hearing test, how do you get around interference from reflective waves?
Introduce a warble tone. (Basically one level below how frequency-specific pure tones are)
Fourier's Theorem: How is degree of complexity of a wave determined?
Depends on the number of sine waves that are combined and on the specific characteristics (frequency, amplitude, and phase) of each sinusoidal component.
periodicity
Signal that regularly repeats itself at regular intervals.
Are pure tones and complex tones periodic? Why or why not?
Yes, because they regularly repeat themselves. Something is only called a tone if it is periodic.
Which tones are easier to see, complex or pure?
Pure (or sinusoidal)
Noise
Only used as a term for aperiodic signals, it sounds amelodic.
Harmonic Relation
All of the sinusoids that compose the series of sinusoids must be whole number multiples of the lowest frequency component. (but not all multiples need to be present in the wave)
Harmonic
Each sinusoidal component present in a complex wave
Harmonic series/Fourier series
The series of frequencies in totality
Fundamental frequency
The first harmonic, or lowest frequency sinusoid in the harmonic series)
overtone
Do not include the fundamental frequency in their numbering system. The number of the overtone is one behind whatever the harmonic is (the 1st overtone is the 2nd harmonic)
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