AUD-1850 Lecture Notes - Lecture 6: Telharmonium, Fundamental Frequency, Signal Generator
1 Sep 2016
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What is sound: sine wave: the fundamental building block of sound. Building blocks of synthesis: sine wave o, square wave o, sawtooth wave o, triangle wave o. Additive combine waveform building blocks (telharmonium, original hammond organ) Subtractive filter sawtooth waves (rca mark ii, moog) Frequency modulation (fm) distort waves (yamaha dx-7) Phase distortion similar to fm (casio: physical modeling. Simulates a sound through mathematical formulas: digital wave synthesis. Wavetable - a series of numbers is created that represents one cycle of a waveform. This wavetable is repeatedly cycled at the desired frequency and played through a digital to analog. An envelope must be added to create the desired attack and decay. Sampling a digitized sample is made of a complete musical tone, including the attack and decay. Different pitches are achieved by playing the sample at different speeds. Wave shaping a combination of wavetable and sampling. Samples are controlled and shaped in search of greater realism.
