PHYS 341 Lecture Notes - Lecture 31: Bbc Radiophonic Workshop, Delia Derbyshire, Moog Synthesizer
Document Summary
Standard musical instrument plus electric assist (not true electrophones ): Also, electrically driven pumps for organ pipes, vanes in vibraphone etc. Electronic oscillators: all-electronic using valves, later transistors + integrated circuits. Digital: computer-generated waveforms, output to speakers by digital- analog conversion (dac) Delia derbyshire, bbc radiophonic workshop (1963: computermatic. Started company making theremin kits (aged 19) + filtered to produce more combinations of sounds. Voltage-controlled oscillators (vco, define frequency: generates simple waveforms (sine, square, sawtooth etc. ) Low-frequency oscillator (input to vcos: controls vibrato etc. Envelope generator: controls attack, sustain, decay. Based on fast fourier transform (fft) [like all spectrum codes we have been using: fft = most important numerical algorithm of our lifetime. Dozen lines of code that take much more than dozen lines to explain. Carl friedrich gauss figured out principle in 1805: fft turns time series frequency series, run fft again: recover time series.
