Generador de Tonos — Herramienta online gratis

Free Online Tone Generator — Precise Frequency and Waveform Control

The Tone Generator is a free, browser-based audio tool that creates precise tones from 20 Hz to 20,000 Hz using the Web Audio API. Choose between four waveform types (sine, square, sawtooth, triangle), adjust volume, visualize the frequency spectrum in real time, and use advanced features like dual tone mode and frequency sweep. All processing happens locally in your browser with no installation, no sign-up, and no data upload.

Understanding Audio Frequencies

Sound is a vibration that travels through air as a pressure wave. The frequency of this wave, measured in Hertz (Hz), determines the pitch we hear. One Hertz means one complete wave cycle per second. The human auditory range spans approximately 20 Hz (very low bass rumble) to 20,000 Hz (extremely high pitch). In practice, most adults cannot hear above 15,000-17,000 Hz due to natural age-related hearing loss called presbycusis.

Different frequency ranges serve different purposes. Sub-bass (20-60 Hz) is felt physically more than heard and is important in cinema and electronic music. Bass (60-250 Hz) provides the fundamental tone of bass instruments and male voices. Midrange (250-4000 Hz) is where most speech intelligibility lives. Presence (4000-8000 Hz) adds clarity and detail. Brilliance (8000-20000 Hz) provides airiness and sparkle to audio.

Waveform Types Explained

The waveform shape determines the harmonic content of the tone, which directly affects how it sounds:

• Sine Wave: The purest possible tone, containing only the fundamental frequency with no harmonics. Used as a reference tone in audio testing, hearing tests, and calibration. Sounds smooth and featureless.
• Square Wave: Contains odd harmonics (3rd, 5th, 7th, etc.) at decreasing amplitudes. Produces a hollow, buzzy sound similar to early synthesizers and video game audio. The sharp on/off transition gives it a distinctive digital quality.
• Sawtooth Wave: Contains all harmonics (2nd, 3rd, 4th, etc.), making it the richest-sounding waveform. Sounds bright and aggressive. Widely used as a starting point for subtractive synthesis in electronic music production.
• Triangle Wave: Contains odd harmonics like the square wave, but they fall off much faster (at 1/n squared vs 1/n). Sounds softer and more mellow than square. Used for flute-like tones and gentle bass sounds.

Musical Note Reference

This tool displays the musical note closest to the current frequency. Western music uses a 12-tone equal temperament system where each octave doubles in frequency. A4 = 440 Hz is the standard tuning reference. Each semitone up multiplies the frequency by approximately 1.0595 (the 12th root of 2). Common reference frequencies include: C4 (Middle C) = 261.63 Hz, E4 = 329.63 Hz, G4 = 392.00 Hz, A4 = 440.00 Hz, and C5 = 523.25 Hz.

Use Cases for Tone Generation

• Speaker and headphone testing: Sweep through frequencies to identify resonances, distortion, or dead spots in your audio equipment.
• Musical instrument tuning: Generate a reference pitch at 440 Hz (or any frequency) to tune guitars, pianos, and other instruments by ear.
• Hearing tests: Check your frequency range by starting at 8000 Hz and increasing until you can no longer hear the tone.
• Sound design: Experiment with waveforms and dual tones to create synthesizer-like sounds and understand harmonic theory.
• Tinnitus masking: Some people use specific frequencies to mask tinnitus sounds. Consult an audiologist before using for medical purposes.
• Audio education: Demonstrate acoustic concepts like harmonics, beat frequencies, intervals, and waveform characteristics.

Dual Tone Mode and Beat Frequencies

When two tones of slightly different frequencies play simultaneously, they create a phenomenon called "beat frequency." The perceived beat rate equals the difference between the two frequencies. For example, 440 Hz and 442 Hz together produce a 2 Hz beat (two pulsations per second). This is the basis for tuning instruments by ear. The dual tone mode also lets you explore musical intervals: a perfect fifth (frequency ratio 3:2, e.g., 440 Hz + 660 Hz), a major third (5:4), and an octave (2:1).

Frequency Sweep Testing

The sweep function plays a tone that continuously rises from 20 Hz to 20,000 Hz over 10 seconds. This is invaluable for testing audio equipment. As the tone sweeps through the frequency range, listen for any sudden drops in volume (indicating frequency response dips), buzzing or rattling (indicating loose components or cabinet resonance), or distortion (indicating driver limitations). Professional audio engineers use this technique to evaluate speakers, headphones, and room acoustics.

Safety Warning

Always start at low volume and increase gradually. High-frequency tones at high volume can cause discomfort and potentially damage hearing. Sub-bass frequencies (below 40 Hz) at high volume can damage speakers not designed for low-frequency reproduction. Never use this tool with headphones at maximum volume. If you experience any discomfort, stop immediately.