Quiet zones using active control

Quiet Zones for Active Control of Sound Using Spherical Loudspeaker Array

Active control of sound can be employed globally to reduce noise levels in an entire enclosure, or locally around a listener‘s head. Recently, spherical loudspeaker arrays have been studied as multiple-channel sound sources capable of generating sound fields with high complexity. In this paper, several aspects of using a spherical loudspeaker array for local active control of sound are investig...

Design of Remote Quiet Zones Using Spot - Type

Spatial soundfield reproduction with zones of quiet

Reproduction of a spatial soundfield in an extended region of open space with a designated quiet zone is a challenging problem in audio signal processing. We show how to reproduce a given spatial soundfield without altering a nearby quiet zone. In this paper, we design a spatial band stop filter over the zone of quiet to suppress the interference from the nearby desired soundfield. This is achi...

Analysis of Quiet Zones in Diffuse Fields

Virtual sensors for local, three dimensional, broadband multiple-channel active noise control and the effects on the quiet zones

In this paper, two state of the art virtual sensor algorithms, i.e. the Remote Microphone Technique (RMT) and the Kalman filter based Virtual Sensing algorithm (KVS) are compared, in both state space (SS) and finite impulse response (FIR) implementations. The comparison focuses on the accuracy of the estimated sound pressure signals at the virtual locations and is based on actual measurements i...