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Signal Lab
Interactive Digital Signal Processing
Signal Sources
Sine
Square
Triangle
Sawtooth
White Noise
Impulse
Chirp (sweep)
+ Add Signal
Additive synthesis: signals are summed together. Adjust frequency, amplitude, and phase for each.
Filter
Enable Filter
Type
Low-pass
High-pass
Band-pass
Notch
Cutoff
2000 Hz
Resonance
1.0
Filter Frequency Response
Effects
Delay / Echo
Delay ms
250
Feedback
0.40
AM (Amplitude Mod)
AM Freq
5 Hz
AM Depth
0.50
FM (Frequency Mod)
Mod Freq
10 Hz
Mod Depth
100
Ring Modulation
Ring Freq
300 Hz
Time Domain (Oscilloscope)
Frequency Domain (Spectrum)
Spectrogram (Frequency over Time)
Time → | Color = Intensity | Vertical = Frequency
Sampling & Aliasing Demo
Sample Rate
44100
Nyquist: 22050 Hz
Original (cyan) vs Sampled (magenta)
When sample rate < 2x signal frequency, aliasing occurs. The sampled signal misrepresents the original.
Show reconstruction
Playback
▶ Play
Volume
0.30
Plays the combined, filtered, effected signal through your speakers.
Preset Demos
Aliasing
Beating Frequencies
FM Synthesis
Filtering Noise
Major Chord
Ring Modulation
Echo Canyon
Chirp Sweep