MUSC 2100 Lecture 5: Dynamic Envelope
Document Summary
A sudden and brief fluctuation in the amplitude of components of a sound. In the initial part of any sound there occur a number of these fluctuations, for instance, the moment a violinist puts the bow to the string of the trumpeter tongues the notes. These are called onset transients and are important in identifying the sound source and its spatial location and timbre. The shape of a sound"s amplitude in time. The change in amplitude of sound over time. Frequency spectrum (perceived as tone quality of timbre) Envelope (change in loudness - also changes in tone quality over time) Transients (fast attack and decay, sudden changes of amplitude, varying degrees of noise) Deterministic events: events with specific frequency content - continuous frequencies (as part of sound spectra) composed of sinusoids (individual sine waves) summer together. Transient events: sudden fluctuations in envelope -brief noisy events - random frequency, non- periodic wavelength.
