AUD-1850 Lecture Notes - Lecture 2: Digital Signal Processing, Instant Recall, Random Access
30 Aug 2016
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Document Summary
Most widely used music and post-production application in the world. Integrates audio, midi, editing, mixing and synch to picture. Scalable from project studio to professional studio. Digital samples, from 16bit 44khz up to 24bit 192khz. Up to 192 playback tracks, unlimited virtual tracks. Complete mix control over signal routing, effects processing, dynamic faders and automation control. Waveform shape of sound; from simple sine wave to jagged and complex. Amplitude height of wave; larger amplitude = higher volume. Frequency cycles completed per second (hz); higher frequency = higher pitch. (range of hearing for children between 20hz and 20khz) Sampling basics -- a/d: analog to digital conversion. Higher sample rate = better approximation of original signal. 20 khz frequency 40khz sample rate. Higher frequencies require higher sample rates for accurate reproduction (avoid aliasing ) Bit depth relates to a system"s ability to represent differences in amplitude. Useful dynamic range of music/speech is 40 105 db = 65 db.
