Patent ID: 11937075
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. Apparatus for generating a sound field description using an input signal comprising a mono-signal or a multi-channel signal, the apparatus comprising:
an input signal analyzer for analyzing the input signal to derive direction data and diffuseness data;
a low-order components generator for generating a low-order sound field description from the input signal up to a predetermined order and mode, wherein the low-order components generator is configured to derive the low-order sound field description by copying or taking the input signal or performing a weighted combination of the channels of the input signal;
a mid-order components generator for generating a mid-order sound field description above the predetermined order or at the predetermined order and above the predetermined mode and below or at a high order using a synthesis of at least one direct portion and of at least one diffuse portion using the direction data and the diffuseness data so that the mid-order sound field description comprises a direct contribution and a diffuse contribution; and
a high-order components generator for generating a high-order sound field description comprising a component above the high order using a synthesis of at least one direct portion, wherein the high-order sound field description comprises a direct contribution only,
wherein the low-order components generator is configured to generate K low-order sound field components, with K being 1 or greater than 1 and depending on the predetermined order and the predetermined mode, wherein the mid-order components generator is configured to generate (L+1)2−K mid-order sound field components, L being greater than K and depending on the high order, and wherein the high-order components generator is configured to generate (H+1)2−(L+1)2 high-order sound field components, wherein H is an integer greater than L and wherein H represents a maximum order of the generated sound field description, or
wherein the mid-order components generator comprises: a reference signal generator for providing a reference signal for a sound field component of the mid-order sound field description and for modifying the reference signal using the directional data; a decorrelator for decorrelating the reference signal or a signal derived from the reference signal to acquire a decorrelated signal; and a mixer for mixing the modified reference signal and the decorrelated signal using the diffuseness data, or
wherein the low-order components generator is configured to perform an energy compensation to a directional component comprised in the input signal or derived from the input signal by copying, taking or performing a weighted combination, and wherein the low-order components generator comprises: an estimator for estimating a first energy- or amplitude-related measure for an omnidirectional component derived from the input signal and for estimating a second energy- or amplitude-related measure for a directional component derived from the input signal; and wherein the low-order components generator is configured to perform an energy compensation of the directional component using the first energy- or amplitude-related measure, the second energy- or amplitude-related measure, the direction data and the diffuseness data, or
wherein the low-order components generator is configured to perform an energy compensation to a directional component comprised in the input signal or derived from the input signal by copying, taking or performing a weighted combination, wherein the low-order components generator comprises an energy compensator for performing the energy compensation, the energy compensator comprising a compensation gain calculator for calculating a compensation gain using the diffuseness data, a maximum order of the sound field components of a first group and a maximum order of the sound field components of a second group, wherein the maximum order of the sound field components of the second group depends of the number of sound field components in the second group.