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### 21 Cards in this Set

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• Back
 Three states of sound 1. Physical 2. As human perception 3. As an idea (art) Five Physical Dimensions of Sound Frequency, Amplitude, Timbre, Space, Time Timbre Overall quality of sound What are the three component parts of timbre? Dynamic Envelope, Spectrum, Spectral Envelope How is dynamic envelope different from the spectrum? Dyanamic Enevelope: countour of changes in overall dyanamic level Spectrum: Composite of all of the frequency components of the sound Fundamental Frequency the most prominent frequency How are harmonics and overtones related to the fundamental frequency? Harmonics/ Subharmonics: whole number multiples of the frequency Overtones/ Subtones: not proportionately related Partials individual frequency components Six elements of a dynamic envelope Attack (time) Initial decay (time) Initial sustain level Secondary decay (time) Primary sustain level Final decay (release time Two parts of the spectral envelope Prefix or onset: the initial attack Body: the remainder of the sound Frequency the number of similar, cyclical displacements in the medium (air) per time unit Amplitude the amount of displacement of the medium at any moment, within each cycle of the waveform Decibels the magnitude of displacement in relation to a reference level Peak amplitude either maximum positive or negative signal level Peak-to-peak total of maximum positive and negative signal level Root mean square [rms] average level of the waveform that more closely approximates the level perceived by our ears Direct Sound sound that travels directly to the listener Reflected Sound sound that will bounce off reflective surfaces before arriving at the listener Reverberant Sound the composite of many reflections of the sound arriving at the receptor in close succession Reverberation Time [RT60] ]: the length of time required for the reflections to reach amplitude of 60 dB lower than that of the original sound source Early Reflection reflections that arrive at the receptor about 50 ms of direct sound (early sound field)