1 / 19

Building the Post-Moog: A Digitally Controlled Analog Synthesizer Project

The Post-Moog project aims to create a low-cost digitally controlled analog synthesizer using modular components. Targeting hobbyist musicians and synth enthusiasts, the synthesizer will replicate classic analog sounds with modern digital control. Key features include MIDI input, preset storage, and real-time signal processing. Using budget-friendly components under $200, it will utilize a Voltage Controlled Oscillator (VCO), Voltage Controlled Filter (VCF), and Voltage Controlled Amplifier (VCA) while maintaining an intuitive interface for users. Join us as we create a versatile instrument for groovy music-making!

cyrah
Télécharger la présentation

Building the Post-Moog: A Digitally Controlled Analog Synthesizer Project

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Post-Moog Digitally Controlled Analog Synthesizer Group Members PM-DCAS • Robert Estelle • Toan Ho • Greg Hartl • Logan Snow

  2. Project Summary • What: • Digitally Controlled Analog Synthesizer • Why: • Flexibility of digital control • Recreate classic analog sounds • Who: • Hobbyist musicians • Synth enthusiasts • Cost: • Low-cost digital and analog components • Totaling less than $200

  3. Technical Objectives • Synthesize traditional analog sounds • Use modular analog components • Support MIDI input • Store and recall presets • Maintain a low cost

  4. Analog Signal Flow MIDI Microcontroller VCO VCF VCA1 Noise VCA2 Output

  5. VCO – Voltage Controlled Oscillator MIDI Microcontroller I’m a big picture of the VCO VCO VCO VCF VCA1 • 1V/Octave control input • At least 3 Octave range • Several Outputs: • Sine wave • Sawtooth wave • Rectangular wave with PWM • Triangular wave • Outputs are mixed before entering VCF Noise VCA2 Output

  6. Noise Source MIDI Microcontroller I’m a big picture of the noise source • White noise • Adjusted through VCA2 before mixing with VCO signals VCO VCF VCA1 Noise Noise VCA2 Output

  7. VCF – Voltage Controlled Filter MIDI Microcontroller • Voltage-controlled resonance and center frequency • Multiple Filter Outputs • High Pass • Low Pass • Band Pass VCO VCF VCF VCA1 I’m a big picture of the VCF Noise VCA2 Output

  8. VCA – Voltage Controlled Amplifier • Logarithmic control voltage • Single board with two amplifiers • VCA1 is dedicated to filter output • VCA2 is dedicated to noise source • VCA1 output connects to final synthesizer output MIDI Microcontroller VCO VCF VCA1 VCA1 I’m a big picture of the VCA Noise VCA2 Output

  9. User Interface Board Objectives • Intuitive interface • Analog feel • Digital control • Interface must be readable by microcontroller • Interface must be writable by microcontroller (in order to support preset recall)

  10. Digital Rotary Knobs • Digital rotary encoder read by the microcontroller • LEDs indicate position of knob to user • Display can be reset by microcontroller to indicate new position

  11. Attack, Decay, Sustain, Release(ADSR Control)

  12. User Interface Design Attack Decay Sustain Release • Noise • Sine • Saw • Tri • Rect Pulse Width Vibrato Center Volume Resonance Options Filter Mode Modulation Variance Filter LPF HPF Fixed Tri BPF Sine P1 P2 P3 P4 Save

  13. Digital Control Scheme … … LED Driver LED Driver … MIDI Keyboard Microcontroller I2C DAC I2C DAC … VCO Control Filter Resonance Other Control Voltages

  14. Demonstration • Demonstration Requirements • Will support adjustment of audio parameters • Will support saving and loading of presets • Will support MIDI input and produce audio output Basically – we will play some groovy music for the class!

  15. Testing and Development • Analog Component Level Testing • LabView to generate analog test signals • Oscilloscopes to verify waveform properties • Circuit tuning and analysis by ear • Digital System Testing • Logic analyzer for synchronizing digital signals • Serial connection for debug output • Internal status LEDs

  16. Problems or Issues • Analog boards are built but untested • Control board layout not complete • Part inventory is incomplete

  17. Remaining Tasks • (24 Oct.) Complete control board layout • (27 Oct.) Test each analog component board • (31 Oct.) Acquire control board components • (Nov.) Construct control interface board • (Nov.) Program microcontrollers • (1 Dec.) Design and construct enclosure

  18. Project Status • Nearly all parts have been received • Voltage controlled boards have been constructed (VCO, VCF, VCA, and noise source) • User interface board has been laid out • Working on laying out digital control board and developing microcontroller software

  19. Questions? ?

More Related