Sound barrier

Virtual sound barrier for indoor transformers

Power transformers sometimes locate in an enclosed room with an opening surface for the ventilation purpose. Under these situations, most noise radiates out from the opening, so a virtual sound barrier can be built to suppress the sound radiation outside by employing a multiple-channel active noise control system. Based on the sound radiation model of indoor monopoles, the noise reduction perfo...

Hybrid active noise barrier with sound masking

In this paper, a hybrid active noise barrier (ANB) with sound masking capability is considered. To protect the speech privacy, several sound masking techniques have been developed. However, these sound masking techniques based on the superposition of the masker and original sound will lead to increase in the loudness of the sound after masking. Against this problem, this paper proposes a soundp...

Breaking the sound barrier in recombination fronts

We exploit a generic instability in the integration of steady, sonic, near-isothermal flows to find the complete transition diagram for recombination fronts (for a model system of equations). The instability requires the integration of the flow equations for speeds between the isothermal and adiabatic sound speeds to be performed with particular care. As a result of this, the previous work of N...

The need for not breaking the sound barrier.

Breaking the Sound Barrier: Mastering at 96 kHz and Beyond

The possibilities of the forthcoming high-density disks has generated considerable interest in recording and mastering of audio material at rates higher than 48 kHz and wider than 16 bits. One of the proposed high-definition audio formats is 96 kHz using 24bit PCM. The difference in the processing required is not simply one of bandwidth: the signal processing itself must be carefully analyzed f...