waveform-synth

Waveform Synth

Generates waveforms using FR_Math's wave generators and ADSR envelope, with both ASCII art visualization and CSV output modes.

What it demonstrates

Feature	Functions used
Square wave	fr_wave_sqr
Triangle wave	fr_wave_tri
Sawtooth wave	fr_wave_saw
PWM (75% duty)	fr_wave_pwm
Sine wave	fr_sin_bam
LFSR noise	fr_wave_noise
ADSR envelope	fr_adsr_init, fr_adsr_trigger, fr_adsr_step, fr_adsr_release
Amplitude modulation	Sine wave multiplied by ADSR envelope

Building

make            # compiles waveform_synth
make run        # compiles and runs (ASCII art)
make run-csv    # compiles and runs (CSV output)
make clean      # removes build artifacts

Or compile manually:

g++ -I../../src -Wall -Os waveform_synth.cpp ../../src/FR_math.c -lm -o waveform_synth

Running

ASCII art mode (default):

./waveform_synth

Renders each waveform as a 64-column x 21-row ASCII plot, plus the ADSR envelope and a combined sin * ADSR amplitude-modulation demo.

CSV mode:

./waveform_synth --csv

Outputs CSV with columns: sample,sqr,tri,saw,pwm,sin,noise,envelope,combined. Suitable for importing into a spreadsheet or plotting tool.

Expected output (ASCII mode)

FR_Math — Waveform Synth Demo  (v...)
  256 samples/cycle, BAM increment = 256

  Square (fr_wave_sqr) (256 samples, showing 64 columns)
   +max |********...                            |
      0 |                                       |
   -max |              ...************************|

  Triangle (fr_wave_tri) ...
  ...
  Sin * ADSR (amplitude modulation) ...

--- end ---

Dependencies

• A C++ compiler (g++ or clang++)
• FR_Math source (../../src/FR_math.c, ../../src/FR_math.h, ../../src/FR_defs.h)
• Standard C math library (-lm)