PGI professors develop technology to reduce ambulance siren noise by 23 dB

The integrated VST further expands the ‘zone of silence,’ allowing noise reduction even at points where placing a microphone is not possible. This becomes crucial inside ambulances, compact metal enclosures where sound tends to echo intensely.

The research team tested the technology using recorded ambulance siren sounds and found that it could reduce noise levels by up to 23 dB, without adding any soundproofing. Experts say this is a significant achievement for ambulance design, as it can dramatically improve patient comfort during transit.

“The study highlights that loud noise can aggravate anxiety, stress, heart rate, and blood pressure in already vulnerable patients. The new technique can help mitigate these effects by creating a calmer environment around the patient,” says Khaiwal.

Researchers emphasised that the primary aim of an ambulance is to transport the patient to the hospital safely and on time, and a peaceful environment should be part of that goal. They noted that feedback ANC combined with VST could become a standard feature in future healthcare transport systems.

The findings also open possibilities for broader use of this technology in ICU transport capsules, mobile medical units, and specialised emergency vehicles, ensuring safer and quieter patient care during critical transfers.