This application visually and intuitively shows how the original waveform is sampled in digital audio, and how the original waveform is reconstructed from the sampled waveform.
You can compare sine, square, saw, and fixed-cycle white-noise source signals with optional band limiting, phase, sampling frequency, and bit depth.
<Usage>
Adjust the original signal type, frequency, level, band limit on/off and frequency, phase, and post-filter additional white noise level, then adjust the sampling parameters.
Use the checkboxes "Show Original Signal" (blue), "Show Sampling" (yellow), and "Show DAC Result" (red) to switch on/off the respective waveforms of the original analog signal, the quantized digital signal, and the signal after DAC.
Experiment with various settings to see how the waveform of the original analog signal changes compared to the waveform after the DAC.
<Key Point>
Digital sampling can reproduce the original waveform surprisingly faithfully within the important audible range. In modern audio, it's rarely a real problem that the signal is represented by digital steps.
R2R DACs, which claim to play back the digital waveform as-is, produce an output waveform that looks nothing like the original analog waveform. It's crap. Don't be fooled!