Audio Signal Studio
Load and play audio, visualize waveform and spectrum, calculate RMS/peak/zero crossings, trim and normalize, export WAV, generate tones and filter signals.
01 · Load & listen
Decode audio supported by your browser; inspect channels, duration and sample rate.
02 · Waveform & spectrum
Waveform overview and averaged FFT magnitude spectrum.
03 · Trim & normalize
Choose a time interval, normalize peak level and export 16-bit PCM WAV.
04 · Signal utilities
Generate a tone, or apply a simple offline high-pass / low-pass filter.
06 · Spectrogram
Short-time Fourier transform (radix-2 FFT) with selectable window, scale and colour map. Click the image to read time, frequency and level.
07 · Loudness & signal analysis
ITU-R BS.1770 / EBU R128 integrated loudness (K-weighting, gating), loudness range, true peak, clipping, DC, stereo image, spectral shape and a pitch track (YIN).
08 · Hidden data in audio (LSB)
Statistical checks on the 16-bit PCM least-significant bits, plus an LSB embed/extract tool for testing. Natural recordings often have noisy LSBs, so combine the signals; none is proof.
09 · Working audio & effects chain
Load the file from panel 01 (or generate audio in panel 10), stack effects with undo, preview and export 16-bit WAV.
10 · Generators & data over sound (tones · DTMF · FSK modem · Morse)
Every generator writes into the working audio above. Decoders read the working audio, so you can load a recording (panel 09) and decode it.