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Complex Sounds
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Terms in this set (17)
pure tone
tone with single frequency (sine wave)
complex sounds
sounds that consist of many different frequencies
harmonic frequencies
any frequency that is a multiple of the fundamental frequency
sawtooth noise
complex periodic sound after enough harmonics have been added to the fundamental, wave form will have repeating pattern
aperiodic complex sounds
have 2 or more frequencies, but are not systematically related to each other and sound like noise (2 kinds continuous and transient)
wave form
looks at amplitude and time/phase
discrete frequency spectral analysis
display each frequency on a spectral analysis only when a small number of frequencies are present
spectral analysis
has a vertical line representing the frequency and amplitude of each of the tones, useful in representing complex sounds, both aperiodic and periodic
continuous line spectral analysis
horizontal line that indicates all frequencies are present beneath the line
white noise
broad band of aperiodic noise
pink noise (narrow band noise)
filtered product of white noise decreases in amplitude at a rate of 6 dB, restricted band of continuous frequencies, looks like a bar graph
pass-band filtering
narrow bands of noise
center frequency
frequency that has the greatest sound pressure (frequency with peak amplitude)
filtering slope
difference in dB between amplitude of the peak of the band and the amplitude of frequencies that are one octave below the peak and one octave above the peak
octave
a note at this interval above or below any other, considered in relation to that other
combination tones
result of two sounds combining that do not have a harmonic relationship to produce either the sum or the difference of the two original frequencies
distortion
usually an undesired byproduct of either the sound source or the acoustic environment adding too much force to the sound
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