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Physics 1251 The Science and Technology of Musical Sound

Physics 1251 The Science and Technology of Musical Sound. Unit 4 Session 37 MWF Synthesizers. Physics 1251 Unit 4 Session 37 Synthesizers. In your own words, describe what a synthesizer is and what it does. A synthesizer: is an electronic device; is controlled by a player;

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Physics 1251 The Science and Technology of Musical Sound

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  1. Physics 1251The Science and Technology of Musical Sound Unit 4 Session 37 MWF Synthesizers

  2. Physics 1251 Unit 4 Session 37 Synthesizers In your own words, describe what a synthesizer is and what it does. • A synthesizer: • is an electronic device; • is controlled by a player; • produces electro-acoustic signals; • simulates acoustic instruments; • generates novel and unique sounds.

  3. Physics 1251 Unit 4 Session 37 Synthesizers 1′ Lecture: • A Synthesizer is a player-controlled electronic device creating electro-acoustical signals that emulate other instruments or generate unique sounds. • Notes played by acoustic instruments pass through four phases: (1) attack, (2) decay; (3) sustain; (4) release. (ADSR) • Realistic synthesis requires sound to change with time in pitch, frequency recipe, and amplitude during the ADSR phases. • Synthesizers are either analog or digital. • Synthesizers employ either additive (or subtractive) synthesis or frequency modulation (FM).

  4. Physics 1251 Unit 4 Session 37 Synthesizers 80/20A Synthesizer is a player-controlled electronic device creating electro-acoustical signals that emulate other instruments or generate unique sounds. What does that mean?

  5. ♩ ♩ 44 ♩ ♩ ♩ ♩ ♩ ♩ Physics 1251 Unit 4 Session 37 Synthesizers 80/20A Synthesizer is a player-controlled electronic device creating electro-acoustical signals that emulate other instruments or generate unique sounds. Synthesizer

  6. Physics 1251 Unit 4 Session 37 Synthesizers 80/20A Synthesizer is a player-controlled electronic device creating electro-acoustical signals that emulate other instruments or generate unique sounds. Synthesizer Current I Voltage V I =V/R Ohm’s Law: R =V/I

  7. - + + - + - - + Physics 1251 Unit 4 Session 37 Synthesizers 80/20A Synthesizer is a player-controlled electronic device creating electro-acoustical signals that emulate other instruments or generate unique sounds. Synthesizer Current Voltage

  8. Physics 1251 Unit 4 Session 37 Synthesizers 80/20A Synthesizer is a player-controlled electronic device creating electro-acoustical signals that emulate other instruments or generate unique sounds. Synthesis or the Real Thing?

  9. Physics 1251 Unit 4 Session 37 Synthesizers • The first modern synthesizer was produced by RCA in 1955. • The Moog (rhymes with vogue) synthesizer was invented in 1965 by Robert Moog. First Moog Synthesizer

  10. Attack Sustain Release Decay Physics 1251 Unit 4 Session 37 Synthesizers ♪Realistic synthesis requires emulation of realistic musical sounds. 80/20Musical sounds are characterized by four phases: (1) attack; (2) decay; (3) sustain;(4) release; abbreviated ADSR. Envelop

  11. Voltage Physics 1251 Unit 4 Session 37 Synthesizers 80/20Synthesizers use analog or digital processing. 80/20Synthesizers use analog or digital processing. Analog Pressure Sound Waves

  12. Physics 1251 Unit 4 Session 37 Synthesizers 80/20Synthesizers use analog or digital processing. Digital: Digital Pressure Sound Waves 80/20The amplitude of the waveform is digitized and expressed as a binary number. 1000010000100001

  13. 0001 1101 0010 0100 0011 1000 Physics 1251 Unit 4 Session 37 Synthesizers Digital to Analog Conversion (DAC) 1 2 DAC (Concept) 4 1010 8

  14. 0 0 0 1 0 0 1 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 1 1 1 0 1 1 0 0 0 1 1 0 1 1 1 1 1 0 0 1 1 0 0 1 1 1 0 0 Physics 1251 Unit 4 Session 37 Synthesizers Input Number Electronic Digital-to-Analog Conversion Output Voltage

  15. 0 0 0 1 0 0 1 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 1 1 1 0 1 1 0 0 0 1 1 0 1 1 1 1 1 0 0 1 1 0 0 1 1 1 0 0 Physics 1251 Unit 4 Session 37 Synthesizers Input Number Electronic Digital-to-Analog Conversion Output Voltage

  16. 0 0 0 1 0 0 1 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 1 1 1 0 1 1 0 0 0 1 1 0 1 1 1 1 1 0 0 1 1 0 0 1 1 1 0 0 Physics 1251 Unit 4 Session 37 Synthesizers Input Number Electronic Digital-to-Analog Conversion Output Voltage

  17. Σ Physics 1251 Unit 4 Session 37 Synthesizers Additive Synthesis: • The output signal is built up from a sum of harmonic signals.

  18. Physics 1251 Unit 4 Session 37 Synthesizers Frequency Modulation (FM) Synthesis: • In FM Synthesis the frequency fo of the signal is modulated up and down with a frequency fFM . The vibration recipe contains peaks at fo∓ n fFM . fo fFM Voltage Controlled Oscillator (VCO) If fFM = fo , then one produces a harmonic series, f = m fo .

  19. Physics 1251 Unit 4 Session 37 Synthesizers Summary: • A Synthesizer is a player-controlled electronic device creating electro-acoustical signals that emulate other instruments or generate unique sounds. • Notes played by acoustic instruments pass through four phases: (1) attack, (2) decay; (3) sustain; (4) release. (ADSR) • Realistic synthesis requires sound to change with time in pitch, frequency recipe, and amplitude during the ADSR phases. • Synthesizers are either analog or digital. • Synthesizers employ either additive (or subtractive) synthesis or frequency modulation (FM).

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