Hammond T-500 TWG Digital Control & Signal Conditioning
Initial Project Outline Phase 1 - Testing Analog Devices AD7771 8-channel ADC with Teensy 4.1 Microcontroller Analysis of TWG (Tonewheel Generator) output signals Pre-ADC conditioning SPI control of ADC ADC signal output to Teensy via SPI Digital mixer on Teensy (note selection & amplitude control) Analog output from Teensy (mostly for fun) Matlab analysis of audio signals Determine feasibility of final mixing & stereo/mono effects on Teensy Phase 2 - Testing Alhambra II FPGA as Digital Signal Processor Determine multi-channel capacity of FPGA Basic DSP on FPGA (LP, BP & HP filters) Digital mixer on FPGA Advanced DSP on FPGA (effects, multiple filters, see DAFX book) Determine feasibility of final mixing & stereo/mono effects on FPGA Phase 3 - Design of 88-Channel ADC Board Likely to include 11 each 8-channel ADC chips 11 FPGAs? How many channels can one FPGA handle? Phase 4 - MIDI control via Teensy Note-on messages Effects selection and control Phase 5 - Analog O...