AD Sound Analyzer is a program which lets you to view the main parameters of a sound: Waveform, Spectrum and Spectrogram simultaneously in real time. Waveform window presents a sound amplitude. Spectrum window lets you to observe distribution of frequency components of the actual sound. Spectrogram displays a sound spectrum with time. The program performs Fast Fourier Transform (FFT) with rectangular, Hann, Hamming and Sine Window function. Sound spectrum is represented in frequency range from 10 Hz to 20 kHz with linear or logarithmic scale. It requires low CPU and resource usage.