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 16:
17. Method for generating a sound field description using an input signal comprising a mono-signal or a multi-channel signal, 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 method further comprises combining low-order sound field components of the low-order sound field description, mid-order sound field components of the mid-order sound field description and high-order sound field components of the high-order sound field description to obtain a combined sound field having (H+1)2 sound field components, wherein H is a maximum order of the generated sound field description, or
wherein the method further comprises calculating directional gains for mid-order sound field components of the mid-order sound field description and high-order sound field components of the high-order sound field description from the direction data and/or the diffuseness data and feeding the directional gains for the mid-order sound field components to the generating the mid-order sound field description step and feeding the directional gains for the high-order sound field components to the generating the high-order sound field description step, or
wherein the generating the high-order sound field description comprises only synthesizing a direct portion for a sound field component of the high-order sound field description using the direction data, and wherein the method further comprises evaluating a spatial basis function for an order and a mode of the component of the high-order sound field description, wherein the generating the high-order sound field description comprises deriving the sound field component from a reference signal and the directional gain.