Calibrated Audio Signal Generator
Generate laboratory-grade audio test signals directly in your browser: high-purity sine waves with standard ISO presets (100 Hz, 440 Hz, 1 kHz, 10 kHz), calibrated pink noise, and 3-second logarithmic sine sweeps. Pre-calibrated to the safe -18 dBFS 0 VU reference standard.
Field Oscillator Rack
equalizer Console Meter Lineup & Gain Staging
In professional live sound and broadcast engineering, calibrated test signals ensure that all gear across the audio chain—from digital mixing consoles to stage distribution racks, system DSP processors, and power amplifiers—operate at unity gain with predictable headroom.
Digital audio meters are measured in decibels full scale (dBFS), where 0 dBFS is the absolute digital ceiling above which harsh clipping occurs. Because live music requires substantial dynamic headroom for uncompressed acoustic transients, international standards define nominal operating level well below full scale:
public EBU R68 Standard (-18 dBFS)
Widely used across Europe, touring consoles, and AES/EBU digital routing. A 1 kHz sine tone at -18 dBFS corresponds to nominal analog line level (0 VU = +4 dBu / 1.228 V RMS), leaving 18 dB of dynamic headroom before digital clipping.
broadcast_on_home SMPTE RP155 Standard (-20 dBFS)
Standard across North American broadcast and live theater. A 1 kHz tone at -20 dBFS aligns with nominal 0 VU analog (+4 dBu), preserving 20 dB of dynamic headroom for loud brass and percussion transients.
engineering Practical Field Applications for Sound Engineers
cable Multi-Channel Snake & Line Checks
Injecting a steady 1 kHz tone at -18 dBFS down multi-pin stage snakes and Dante networks allows a single technician at FOH to trace input channels, verify patch bay labeling, and check split lines without needing a second person speaking into stage microphones.
graphic_eq PA Acoustic Tuning with Pink Noise
Pink noise contains equal acoustic energy per fractional-octave band (-3 dB per octave rolloff), perfectly matching the logarithmic response of human hearing and Real-Time Analyzers (RTA). Feeding pink noise into a sound system allows technicians to measure room decay and correct tonal balance without burning out HF tweeters.
stacked_line_chart 3-Second Logarithmic Sine Sweep
Sweeping a pure sine wave smoothly from 20 Hz to 20,000 Hz over a 3.0-second window distributes equal acoustic energy per octave. This allows technicians to sweep individual loudspeaker drivers, detect voice coil rubbing or cabinet buzzes, and inspect crossover handoffs with continuous broadband excitation.