Signal Processing Simulators

Adaptive Filter Lms Simulator

Signal Processing

Explore LMS adaptive-filter convergence and misadjustment from step size, tap count, input power, noise level, and plant drift.

AM/FM Modulation Simulator

Signal Processing

Learn how a message signal such as audio is "carried" by a radio wave through modulation.

Autocorrelation Function Simulator — Period Detection

Signal Processing

The autocorrelation simulator computes the biased autocorrelation R_xx[k] of a noisy sinusoid and visualizes how period detection works by finding the largest peak at lag k.

Bit Error Rate (BER) Simulator

Signal Processing

Bit Error Rate (BER) Simulator: Compute the bit error rate (BER) that decides the quality of a digital link. Adjust the signal-to-noise ratio Eb/N0, the modu…

Chirp-Z Transform / Zoom-DFT Simulator — High-Resolution Narrow-Band Analysis

Signal Processing

Chirp-Z Transform simulator for high-resolution narrow-band frequency analysis. Zoom into custom frequency ranges, resolve closely spaced tones with flexible bin resolution.

Compressive Sensing & L1 Reconstruction Simulator

Signal Processing

A hands-on simulator for compressive sensing: recover a "sparse" N-dimensional signal that has only K non-zero entries from far fewer than Nyquist measurements, using L1…

DFT Leakage Window Detail Simulator

Signal Processing

DFT leakage window simulator for analyzing scalloping loss, bin offset, and equivalent noise bandwidth in spectral analysis.

Digital Filter Designer (IIR/FIR)

Signal Processing

Design Butterworth, Chebyshev, and FIR filters. Visualize frequency response, coefficients, and test signals in real-time with this advanced digital filter designer tool.

Dynamic Time Warping (DTW) Simulator

Signal Processing

Dynamic Time Warping (DTW) Simulator: An interactive tool for Dynamic Time Warping, the classic algorithm that compares two time series whose speed or phase …

Eye Diagram Simulator

Signal Processing

Eye Diagram Simulator: Reproduce the "eye diagram" that shows the quality of a high-speed digital signal at a glance. Adjust the bit rate, rise time, jitter …

FFT Spectrum Analyzer Simulator

Signal Processing

Simulate FFT spectrum analysis with up to 5 sine waves. Explore windowing, spectral leakage, THD, and DFT parameters like frequency resolution in real time.

FIR Filter Design Simulator — Window Method

Signal Processing

Design linear-phase FIR low-pass filters by the window method. Impulse, dB magnitude, transition width, stopband attenuation and group delay update live.

Fourier Epicycles Simulator — Draw Any Curve with Rotating Circles

Signal Processing

Draw a curve with your mouse and watch it decomposed by DFT into rotating circles (epicycles). Adjust the number of circles in real time to see how Fourier approximation works.

Fourier Series Visualizer — Rotating Phasors & Wave Synthesis

Signal Processing

Explore Fourier series synthesis: simulate square, triangle, and sawtooth waves with 1-50 harmonics. Watch Gibbs phenomenon and harmonic spectrum evolve in real-time.

Fourier Transform Visualizer — FFT Spectrum Analyzer

Signal Processing

Explore Fourier transforms interactively. Adjust signals, windows and frequencies with sliders to visualize real-time waveform and spectrum changes.

Goertzel Algorithm Simulator — DTMF Single Frequency Detection

Signal Processing

Detect DTMF tones with the Goertzel algorithm. A second-order IIR filter extracts 8 DFT bins in O(N), ideal for embedded single-tone detection without an FFT.

Hilbert Transform & Analytic Signal — Envelope Detection

Signal Processing

The Hilbert envelope simulator applies a DFT-based Hilbert transform to an AM signal and extracts instantaneous amplitude, phase and frequency to visualize envelope detection.

Bilinear Transform Simulator — Analog to Digital IIR

Signal Processing

Bilinear Transform Simulator — Analog to Digital IIR: Convert an analog first-order lowpass filter H(s)=ωc/(s+ωc) into a digital IIR filter with the bilinear…

IIR Filter Designer — Butterworth Low-Pass Magnitude Response

Signal Processing

IIR Butterworth low-pass filter designer. Visualize gain |H(jω)| on a Bode plot in real time and compute the minimum order needed for given f_c, f_s and A_s.

Laplace Transform Calculator & Visualizer

Signal Processing

Master Laplace transforms with our interactive calculator. Visualize f(t) and F(s), compute partial fractions, and explore pole-zero maps in real time.

Matched Filter Simulator — Pulse Detection in Noise

Signal Processing

Matched filter simulator: detect a known pulse in white noise via convolution. Compute input/output SNR and processing gain in real time, visualize gain = L.

MFCC Feature Simulator — Mel-Frequency Cepstral Coefficients

Signal Processing

The MFCC simulator applies pre-emphasis, a Hamming window, FFT, a mel filter bank, log and DCT to extract Mel-Frequency Cepstral Coefficients from a speech signal in real time.

Mutual Information (MI) Estimation Simulator

Signal Processing

An interactive playground for I(X;Y), the information-theoretic measure of dependence that captures both linear and non-linear relations.

Nyquist Sampling Theorem Simulator — Aliasing of Sampled Signals

Signal Processing

Nyquist sampling simulator: signal frequency f, sampling rate f_s, duration and bit depth N to compute Nyquist f_s/2, alias frequency f_alias and quantisation SNR=6.02N+1.76 dB.

Parseval's Theorem — Energy Conservation in Time and Frequency

Signal Processing

Parseval's theorem for the DFT: time-domain energy of a discrete signal equals frequency-domain energy. Test with sinusoid, rectangular pulse and Gaussian signals in real time.

Shannon Channel Capacity Simulator — Information Theory Limit

Signal Processing

Compute Shannon-Hartley capacity C=B·log2(1+S/N) in real time from bandwidth, signal and noise power. Visualises SNR, spectral efficiency and required bandwidth for a target rate.

Digital Filter Design — Frequency Response Simulator

Signal Processing

Design digital low-pass, high-pass and band-pass filters and inspect their frequency response in real time.

Digital Filter Frequency Response Design Tool

Signal Processing

Design and visualize Butterworth, Chebyshev & Bessel IIR filter responses in real time. Adjust type, order, and cutoff frequency instantly.

Signal Modulation Simulator

Signal Processing

Visualize AM, FM, and PM modulation in real time. Adjust parameters like carrier frequency and modulation index to see waveforms and spectra.

Signal & Noise SNR Analyzer

Signal Processing

Analyze signal integrity in real time. Add noise types, compute SNR/ENOB, and visualize results with this interactive CAE tool.

Sampling Theorem & Aliasing Visualizer

Signal Processing

Visualize the Nyquist-Shannon sampling theorem interactively. See real-time aliasing when sampling is too slow and understand the Nyquist frequency.

Spread Spectrum Processing Gain Simulator

Signal Processing

Design a direct-sequence spread spectrum (DSSS) communication link.

Waveform Generator & Synthesizer — RMS, FFT Spectrum, THD Calculator

Signal Processing

Design complex waveforms by combining up to 4 signal components. Instantly analyze key metrics like RMS, THD, and crest factor while visualizing the composite result.

Daubechies-4 Wavelet Simulator — db4 Multiresolution Analysis

Signal Processing

Interactive Daubechies-4 (db4) wavelet simulator: multi-level DWT of 1D signals, thresholding of detail coefficients, and reconstruction MSE. Smoother basis than Haar.

Haar Wavelet Transform Simulator — Multiresolution Analysis and Compression

Signal Processing

Haar wavelet decomposition for step signal analysis with real-time coefficient visualization, compression, and reconstruction error thresholding.

Window Function Spectral Comparison — Mainlobe Width and Sidelobe Suppression

Signal Processing

Window Function Spectral Comparison tool for analyzing mainlobe width and sidelobe suppression in rectangular, Hann, Hamming, Blackman windows. Spectral leakage analysis.

Z-Transform & Digital Signal System Analyzer

Signal Processing

Visualize and analyze digital filters in real-time. Enter H(z) coefficients to get pole-zero plots, frequency & impulse responses, and stability checks.