Analytical Approach to Wave Field Reconstruction Filtering in Spatio-Temporal Frequency Domain

Virtual Reality Technologies in Telecommunication Services

“…For reproducing the sound field of a remote location in a space by using many microphones and loudspeakers, many researchers have proposed methods based on the boundary surface control (BoSC) principle [61], [62], methods based on a wave field reconstruction (WFR) filter [63], [64], and other methods.…”

“…Because the driving signals of the loudspeaker array are calculated on the basis of an analytically derived filter, the systems can transmit sound fields to remote locations with a low delay [63], [64]. Sound images can be represented in front of loudspeakers by applying an inverse wave propagator [65], and then an original space and a destination space can be overlapped.…”

Least squares approach in wavenumber domain for sound field recording and reproduction using multiple parallel linear arrays

“…In practical implementations, (3) and (4) must be discretized and truncated [21]. When using L channels for each microphone and loudspeaker array, (3) is discretized and truncated, just as in [14], and is represented as e Pðk x;i ; y; z; xÞ ¼ e Dðk x;i ; xÞ Á e Gðk x;i ; y; z; xÞ ði ¼ 1; 2; . .…”

“…Many kinds of methods based on WFS have been developed, including least squares (LS) algorithms that use the inverse of the transfer functions between each pair of recording and loudspeaker positions [11,12], the spatial Fourier transform [13,14], and the inverse wave propagator [15]. In most cases, since these methods were proposed and implemented using a pair of linear microphone and loudspeaker arrays based on a 2.5D WFS [4,5] for horizontal sound field reproduction, they cannot synthesize vertical sound fields [11,12,14,15].…”

“…In most cases, since these methods were proposed and implemented using a pair of linear microphone and loudspeaker arrays based on a 2.5D WFS [4,5] for horizontal sound field reproduction, they cannot synthesize vertical sound fields [11,12,14,15]. However, not only horizontal reproduction but also vertical reproduction is critical when using a big screen system.…”