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 15:
16. A non-transitory digital storage medium having a computer program stored thereon to perform, when said computer program is run by a computer, the method for generating a sound field description using an input signal comprising a mono-signal or a multi-channel signal, the method comprising:
analyzing the input signal to derive direction data and diffuseness data;
generating a low-order sound field description from the input signal up to a predetermined order and mode, wherein the generating the low-order sound field description comprises deriving the low-order sound field description by copying the input signal or performing a weighted combination of the channels of the input signal;
generating a mid-order sound field description above the predetermined order or at the predetermined order and above the predetermined mode and below 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
generating a high-order sound field description comprising a component at or above the high order using a synthesis of at least one direct portion without any diffuse component synthesis so that the high-order sound field description comprises a direct contribution only,
wherein the generating the low-order sound field description comprises generating 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 generating the mid-order sound field description comprises generating (L+1)2−K mid-order sound field components, L being greater than K and depending on the high order, and wherein the generating the high-order sound field description comprises generating (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 generating the mid-order sound field description comprises: providing a reference signal for a sound field component of the mid-order sound field description and modifying the reference signal using the directional data; decorrelating the reference signal or a signal derived from the reference signal to acquire a decorrelated signal; and mixing the modified reference signal and the decorrelated signal using the diffuseness data, or
wherein the generating the low-order sound field description comprises estimating a first energy- or amplitude-related measure for an omnidirectional component derived from the input signal, estimating a second energy- or amplitude-related measure for a directional component derived from the input signal, and performing an energy compensation of the directional component comprised in the input signal or derived from the input signal by copying, taking or performing a weighted combination 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 generating the low-order sound field description comprises performing 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, using a compensation gain, wherein the compensation gain is calculated 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.