is a program which realizes observing of audio signals simultaneously
in time and frequency domains (TFD). It uses a sound card in your computer. You can see a signal
waveform as well its spectrum in real-time. This program can be used for continuous viewing of
signals with sound frequencies about from 10 Hz to 20 kHz. For example, connecting microphone to
the sound card and running the program you can investigate your own voice peculiarity by observing
of waveform and spectrum interrelation. Connecting external signals to Line In socket of TFD Scope
can help to estimate parameters of periodic as well as non-stationary signals.