📡 信号与电信

AM / FM ModulationInteractive amplitude and frequency modulation simulator. See carrier, message and modulated… FFT Spectrum AnalyzerReal-time FFT frequency spectrum analyzer using the Web Audio API. Visualise sine, noise,… Antenna Radiation PatternsInteractive polar plot of antenna radiation patterns: isotropic, dipole, monopole, Yagi-Uda,… Optical Fiber & Total Internal ReflectionVisualise total internal reflection, critical angle, numerical aperture and V-number in a… Digital Filter (FIR/IIR) — Bode Plot & Frequency ResponseInteractive FIR/IIR digital filter designer. Visualise Bode plot (magnitude + phase),… OFDM & WiFi Subcarriers — Multicarrier ModulationInteractive OFDM simulator. Visualise how WiFi splits data across orthogonal subcarriers,… Phase-Locked Loop (PLL) — Clock Recovery & Carrier SyncInteractive PLL simulator. Watch a phase-locked loop lock onto a noisy carrier. Adjust VCO… GPS TrilaterationNewFix a receiver position from satellite ranges r=c·Δt — three circles pin the location, a… 2D Image FFTNewSee an image, its 2D Fourier magnitude spectrum, and the result of frequency-domain… Doppler Weather RadarNewA Doppler radar measures radial velocity via Δf=2v_r·f/c on a rotating PPI display. Only the… Spectral AnalysisNewFFT, spectrogram, STFT windowing and frequency domain analysis of signals. Noise CancellationNewVisualise how active noise cancellation uses anti-phase signals to destructively interfere… Phase-Locked Loop — Locking onto a SignalNewA PLL compares its oscillator's phase to an input, then adjusts to track it. This feedback… Nyquist Sampling — When Digital Captures AnalogueNewTo capture a signal you must sample above twice its highest frequency (Nyquist rate). Sample… Convolution — How Filters Reshape SignalsNewConvolution slides one function over another, multiplying and summing at each shift. It is… Wavelet Transform — Haar & DaubechiesNewDecompose a signal with Discrete Wavelet Transform (DWT). Haar and Daubechies-4 filters…