Tools
Simulations and calculators. Every setting lives in the page address, so a link shares exactly what you see.
Land the Falcon 9
SimulationLand it yourself in 3D, open loop. Fly with assistance. Or watch model predictive control do it.
Step response
SimulationDefine a transfer function of any order up to 8, watch it answer a step, and see its poles and zeros in the S and Z planes.
Convolution
SimulationDefine two functions and watch one slide across the other. The area they share at each moment draws the result.
Signal processing
SimulationA small synthesiser: two waveform generators into a classic filter, or one you build from poles and zeros. See it, and hear it.
Image processing
CalculatorTreat a picture as a 2D signal. Upload your own, then blur, sharpen and outline it, or filter its spectrum with Butterworth, elliptic and more.
PID control
SimulationTune the most common controller in engineering. Hold a room at temperature, place a mass on a spring, and balance a pole on a moving cart.