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17 Cards in this Set
- Front
- Back
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simple addition
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addition of two or more waves point by point to produce a complex wave
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gating
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using one wave to turn nother wave on and off. the gating signal switches on and off a higher-frequency signal.
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carrier
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the higher-frequency signal
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modulator
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the lower-frequency signal
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amplitude modulation
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the modulator signal changes the amplitude of the carrier.
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100 percent modulation
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amplitude of the modulator is exactly equal to the offset level, will be in phase
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overmodulation
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when the amplitude of the modulator is greater than the offset level, same frequency but different amplitude
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tremolo
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the modulator has a frequency of about 1 to 10Hz the effect of amplitude modulation can be heard as a pulsing or throbbing tone, continually increasing or decreasing in loudness
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balanced modulation or doublesideband modulation
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offset level of the modulator is 0, beats are out of phase
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frequency modulation
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the modulator causes the frequency of the carrier to vary while leaving the amplitude of the carrier wave unchanged
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beat generation
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two waves with slightly different frequencies create beats
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vibrato
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in frequency modulation hen we hear a sound of constant amplitude whose pitch oscillates slightly
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SIL
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Intensity of sound is a physically measurable quantity loudness is another way to express intensity. It's a subjective although measurable physiological sensation.
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Place theory of hearing
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based primary on this observed correlation of frequency with position of response along the basilar membrane.
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Frequency
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number of vibrations per second, measured in Hz
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Wavelength
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the distance in space over which a periodic wave repeats itself, measured in m
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Period
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the time required for a periodic wave to repeat itself, measured in s or ms
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