Background Noise Simulation
A sequence that calibrates a 4.1 speaker array to conform with the ETSI ES 202 396-1 Standard.
This sequence calibrates a 4.1 speaker array in accordance to the ETSI ES 202 396-1 standard “Loudspeaker Setup for Background Noise Simulation”.
The standard is available for free download from the ETSI website here.
The sequence begins by measuring the front/rear balance of the left and right main speaker pairs. If they are within 2 dB of each other, the sequence will continue by measuring the combined sensitivity of each pair and, using pink noise, equalize the output of each pair. Once the left and right pairs are calibrated, the subwoofer level is manually adjusted to match the output level of the four main speakers.
Included with the sequence is a library of real world binaural recordings from the ETSI standard: cafeteria, pub, crossroad, vehicle, single voice distractor, and office noises. Custom or user-defined binaural recordings can also be used to create background noise tests directly applicable to your product. This sequence has many applications including evaluating ANC on headphones, noise suppression on communication devices, voice recognition testing of smart speakers / IoT, SNR optimization of microphones on telepresence devices and beamforming directionality studies of microphone arrays.