Table 1 The averaged overall SPL without and with proposed ANC system for three types of synthetic example environmental primary noise.

From: Ultra-broadband local active noise control with remote acoustic sensing

Noise type (average duration) Averaged overall SPL (dB)
Without ANC With ANC Noise reduction
Aircraft interior (0–15 s) 74.7 59.6 15.1
Aircraft flyby (3–8 s) 82.1 61.6 20.5
Ambient speech (0–15 s) 75.5 59.8 15.7