Shape the waveform
Compare pure sine tones with square, triangle, and sawtooth waves. Their discontinuities and slopes create different harmonic profiles.
◆ Audio engineering workspace Studio · v2
Signal Generator & Oscilloscope
Create and combine precise waveforms, explore phase and harmonics, and inspect live microphone input—with private, in-browser processing.
✓ Four wave shapes✓ Six mixable channels✓ Time + frequency view
THE WORKSPACE
Signal studio
Changes appear in the plots immediately. Sound starts only when you press Play.
02 / INSTRUMENTS
Oscilloscope
ms
Amplitude (normalized)Combined output shown in white-blue
Frequency spectrum
20 Hz to selected limit · log scaleFFT bin ≈ 5.9 Hz
Peak—normalized amplitude
RMS—signal power
Dominant frequency—approximate FFT bin
Time-domain waveform of the generated signal.
High frequencies are packed tightly into this time window. Zoom into a shorter window to distinguish individual cycles.
03 / EXPORT
Keep your results
Download locally; no sign-in or server transfer.
Undo/Redo: restores up to 50 recent signal configurations. Scope modes: Time shows amplitude versus time; X–Y compares any two generated channels. For live microphone, choose the Microphone source to request access, and use the trigger to stabilize a repeating waveform. Hold freezes the display while capture remains active. Generated: visualizes an ideal mathematical mix from time 0, even without sound. Microphone: displays incoming live audio after permission; it is never played through the speakers. WAV/CSV exports always use the configured generated signals, not the microphone.
Sound uses a browser audio thread when supported. Raw sum clips above ±1, while peak-safe mix divides by at least the sum of active amplitudes. FFT peaks are estimates, not laboratory measurements. Sample rate: 48 kHz for generated analysis; WAV: 44.1 kHz, mono PCM16.
s
CSV contains 2,001 equally spaced samples from the selected time window. Oscilloscope PNG saves the visible time or X–Y plot; Spectrum PNG saves the visible spectrum. Microphone recordings are not stored or exported. The preset format is JSON, version 1.
Explore the building blocks of sound.
Understand phase
Shift one signal relative to another. Try the phase-cancellation preset to see opposite phases cancel in the combined output.
Explore the spectrum
See which frequencies dominate your mix and how wave shapes contribute higher-frequency harmonics.
Frequently asked questions
Does PixelOkay upload my audio or microphone input?
No. This tool makes calculations and processes microphone samples in your browser. It does not send recordings to a server. Microphone access begins only after permission and ends when you press Stop microphone, reset, or leave the page.
Why can I see a waveform but not hear it?
The mathematical preview is independent of audio playback. Use Play sound and unmute the device. Modern browsers require a user gesture before audio may play. For microphone input, use a secure HTTPS site or localhost.
Is this an electrical oscilloscope or precision measurement tool?
No. The input is browser-generated audio or the device's microphone, not a calibrated electrical probe. The amplitude is normalized digital audio, not measured voltage. Displayed frequency and power are approximate.
What export formats are available?
Mono 16-bit PCM WAV at 44.1 kHz (0.1–30 seconds), CSV waveform/spectrum, PNG waveform screenshot, and a reusable JSON signal preset. WAV and CSV waveform exports reflect the generated configuration, not microphone input.