Patent ID: 9338554
Filing Date: 2016-05-10
CPC Classification: H04R,H04S

Claim Text:
1. A sound system for acoustically reproducing k electrical audio signals, where k≧2, and establishing k sound zones, in each of which one of k reception sound signals occurs that is an individual pattern of the reproduced and transmitted k electrical audio signals, the system comprising: a signal processing arrangement that is configured to process the k electrical audio signals to provide k processed electrical audio signals; and k loudspeakers that are arranged at positions separate from each other and within or adjacent to the k sound zones, each configured to convert the k processed electrical audio signals into corresponding k acoustic audio signals; where each of the k acoustic audio signals is transferred according to a transfer matrix from each of the k loudspeakers to each of the k sound zones, where the k transferred acoustic audio signals contribute to the corresponding reception sound signals; wherein said processing of the k electrical audio signals, which provides k processed electrical audio signals, comprises inverse filtering according to three filter matrices, one of which is an i×i filter matrix, one is a j×j filter matrix and one is a k×k filter matrix, in which i, j <k; each of the i×i matrix and j×j filter matrix is configured to digitally process a share of the k electrical audio signals in a first frequency range or at a first sampling rate or both, or in a second frequency range or at a second sampling rate or both, respectively, and the k×k filter matrix is configured to digitally process all k electrical audio signals in a third frequency range or at a third sampling rate, the third sampling rate being the lowest of the three sampling rates and an upper frequency limit of the third frequency range being lower than upper frequency limits of the first frequency range and the second frequency range; and the three filter matrices are configured to compensate for the transfer matrix so that each of the reception sound signals corresponds to one of the electrical audio signals.