A virtual sensing ANC system can achieve higher noise reduction at the desired locations by measuring the system models from physical sensors to virtual sensors, which will be used in the online operation of the virtual sensing ANC algorithm.
This leads to less noise reduction in speech dominant segments leading to less speech distortion and a higher noise reduction during speech absence.
It has been well demonstrated that such integration methods can achieve higher noise reduction performance than that obtained using conventional adaptive microphone arrays [13] such as the Griffith-Jim array [6].
The FWHM red is lower than the correlation weight for all SNR gain values, with the DSWT delivering better edge preservation at high noise reduction rates.
The image shows that our algorithm performs well in the reconstruction by keeping image sharpness while allowing high-quality noise reduction.
Therefore, to obtain meaningful infrasound signals associated with a volcanic source, a high-quality noise reduction system, such as multiple sensors in an array, is required (e.g., Ripepe and Marchetti 2002; Garcés et al. 2003).
It can be seen that for high power and high SNR, a noise reduction of about 1 dB is obtained, which means that noise reduction is virtually inactive.
After prolonged negotiations, the developers agreed to incorporate high levels of noise reduction in the new tower, including sealed windows and internal "winter gardens".
The high degrees of noise reduction, which are 14.9 dB for the airplane noise and 20.4 dB for the house heater noise, obtained from the experimental tests confirm the feasibility of the ANC earmuffs application.
