Concert A
- Input
- 440 Hz
- Expected output
- A4, 0 centésimos
MIDI note 69, the ISO 16 reference.
Carregando ferramenta… / Loading tool…
440 hz tone
The generator opens on 440 Hz, sine wave, both sides: turn your device volume down, press Play and you hear the tuning A. Use the arrow keys to move 1 Hz at a time, or PageUp and PageDown to go up and down one semitone.
MIDI note 69, the ISO 16 reference.
Halving goes down one octave.
Doubling goes up one octave.
A ratio of 1.0595.
Time of one full cycle.
How many samples the file uses per cycle.
From 1 Hz to 22 kHz, limited by the Nyquist limit of your audio: half the sample rate. On a 44.1 kHz device the technical ceiling is 22.05 kHz and the tool uses 22 kHz. If your audio runs at a lower rate the frequency is reduced and a notice appears. Human hearing spans roughly 20 Hz to 20 kHz in young people, so below 20 Hz you feel vibration instead of hearing it, and above 18 to 20 kHz many people hear nothing at all.
No. 440 Hz is the standard, but orchestras often raise it to 441 to 443 Hz, and Baroque instruments are tuned near 415 Hz, a semitone lower. Pianos are tuned to whatever reference the tuner picks, and electronic instruments follow whatever reference you set.
The frequency is the same, but each headphone and speaker has its own response. At 440 Hz almost any equipment reproduces it well; what changes is perceived loudness and any buzz or cabinet rattle. If the tone sounds dirty, lower the device volume before blaming the frequency.
Yes. Open Download as WAV, choose 1 to 120 seconds, 44.1 or 48 kHz and the peak level, and the browser renders a 16-bit stereo file. A 10-second file at 44.1 kHz is about 1.7 MB.