Vocal Clarity & Dialogue Intelligibility Lab
Solve the classic “Can you speak up?” challenge. Calibrate speech presence, compress dynamic range, isolate dialogue from chaotic background noise, and export broadcast-grade audio.
Real-Time Spectral & Speech Monitor
Dual FFT Spectrum: Green = Dialogue, Amber = Masking NoiseThe Acoustic Physics of “Can You Speak Up?”
When interviewing on high-energy press lines, noisy soundstages, or crowded ballrooms, sound engineers face auditory masking: broadband crowd noise overlaps the critical 1.5 kHz to 4.5 kHz consonant intelligibility envelope where human speech articulation (letters like t, k, s, p) is recognized.
Simply turning up the master volume amplifies the thunderous low-frequency HVAC rumble and clinking glasses alongside the voice, inducing ear fatigue and audio distortion. True speech clarity requires surgical high-pass filtering, presence boosting at resonant vocal formants, and transparent downward dynamic compression.
Acoustic Calibration FAQ
Why does the 2.8 kHz Presence Boost make dialogue punch through?
The human ear canal has an acoustic natural resonant frequency peak around 2.5 kHz to 3.5 kHz. Boosting this region allows the voice to be understood at lower absolute sound pressure levels without fighting the background noise floor.
What is STI (Speech Transmission Index)?
STI is the international standard (IEC 60268-16) metric for speech intelligibility, ranging from 0.00 (completely unintelligible) to 1.00 (pristine audibility). A rating above 0.75 guarantees effortless comprehension in broadcast media.
How does the browser audio mastering engine work?
This studio runs entirely on your local machine using the native Web Audio API pipeline with high-precision double-precision DSP filtering, an envelope compressor, real-time Fourier transform (FFT) analysis, and a local 16-bit 44.1kHz linear PCM WAV encoder.