Tasa de Muestreo (Sample Rate)Acústica
What is audio sample rate?
The number of discrete amplitude measurements captured per second during ADC conversion (e.g., 44.1 kHz for CD master standard or 48 kHz for studio broadcast).
ACOUSTIC & AUDIO DIAGNOSTICS
Online Microphone Test & Audio Diagnostics
Test your microphone in real time: input level, frequency spectrum, and echo test.
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Level—
—Quality
Frequency—
Echo Test
Record up to 10 s and play it back to verify hardware quality.
Start the test first
Operation & Purpose
What is the Microphone Test and How Does It Work?
1
What problem does it solve?
Verifies if your microphone captures clear sound, adequate gain, or unwanted distortion before joining video conferences, online classes, or gaming sessions.
2
Echo Test & Live FFT Spectrum
Visualizes your voice frequency curve in real time and records up to 10 seconds to hear exactly how others hear you without installing third-party apps.
3
100% In-Browser Privacy
All acoustic processing runs locally through the native Web Audio API. Your voice never leaves your device and is never stored on external servers.
Quick Usage Guide
- Haz clic en el botón "Iniciar" y acepta la solicitud de permiso del micrófono en tu navegador.
- Habla a volumen normal; la barra de nivel y las columnas de frecuencia reaccionarán inmediatamente a tu voz.
- En el apartado "Test de Eco", haz clic en "Grabar (10 s)" y luego en "Reproducir" para escuchar tu audio con fidelidad.
Diagnostics & Maintenance
Common Microphone Issues & Step-by-Step Fixes
Identify microphone issues and resolve them with quick fixes and advanced audio engineering adjustments.
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Issue 1: Microphone not detected or browser permission denied
⚡ Quick User Solution
Click the lock icon 🔒 next to the browser URL, switch Microphone permission to 'Allow', and refresh the page.
🔧 Advanced Technical Fix
In Windows: Settings > Privacy & Security > Microphone > enable 'Allow apps to access your microphone'. For 3.5mm jacks, confirm the TRRS combo pinout matches your motherboard port.
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Issue 2: Input volume is extremely low or barely audible
⚡ Quick User Solution
Position the mic 10-15 cm from your mouth and turn up the input volume slider in your operating system sound settings.
🔧 Advanced Technical Fix
Under Windows Sound Control Panel > Recording > Microphone Properties > Levels: boost Microphone Gain by +10 dB to +20 dB and disable exclusive communications ducking.
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Issue 3: Static hiss, electric hum, or 50/60 Hz ground noise
⚡ Quick User Solution
Keep power bricks and AC cords away from the mic cable, and plug USB microphones directly into rear motherboard ports.
🔧 Advanced Technical Fix
Caused by Ground Loops or unshielded onboard audio codecs. Fix: install a ground loop isolator or upgrade to an external USB audio interface with balanced XLR preamps.
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Issue 4: Acoustic echo or feedback loop during voice calls
⚡ Quick User Solution
Wear headphones instead of open desk speakers to stop incoming call audio from re-entering your microphone.
🔧 Advanced Technical Fix
Enable Acoustic Echo Cancellation (AEC) and Noise Suppression (NS) DSP filters in your audio driver or conference app (Discord/Zoom/Teams).
Trivia & Acoustics
Did You Know? Curious Microphone History & Facts
The first microphone in history (1876)
Emile Berliner invented the carbon button microphone in 1876 after inspecting Alexander Graham Bell's telephone prototype. Bell was so impressed by its acoustic clarity that he acquired the patent for $50,000.
Why is 48,000 Hz (48 kHz) the gold standard?
The Nyquist-Shannon theorem proves that to capture human audible frequencies (up to 20 kHz) without aliasing artifacts, audio must be sampled at least twice as fast (40 kHz). 48 kHz delivers the optimal engineering threshold.
Condenser vs Dynamic: What is the difference?
Condenser mics use a gold-sputtered electrostatic diaphragm (hyper-sensitive for studio vocal nuance). Dynamic mics use an electromagnetic moving coil rugged enough to handle extreme stage SPL and concert touring.
How do DSP chips eliminate acoustic echo?
A Digital Signal Processor (DSP) samples the speaker output in real time and compares it against incoming microphone audio. By mathematically subtracting the reference signal, it eliminates call feedback without degrading vocal timbre.
Audio Capture & Microphones Glossary
Learn the fundamental concepts, protocols, and technical terminology of this tool.
Piso de Ruido (Noise Floor)Señal
What is microphone noise floor?
The baseline continuous background noise generated by the thermal resistance and preamplifier circuitry of a microphone in total acoustic silence.
Latencia de Entrada (Buffer)Hardware
What is audio input buffer latency?
The processing delay measured in milliseconds between acoustic pressure hitting the capsule diaphragm and digitised audio frames entering software buffers.
Ganancia vs VolumenAudio
What is the difference between gain and volume?
Gain controls the raw amplification sensitivity applied to the transducer input signal; volume governs output attenuation delivered to monitors or headphones.