US 10,542,364 B2Granted

Methods, apparatus and systems for decompressing a higher order ambisonics (HOA) signal

AssigneeDolby Laboratories Licensing Corporation

InventorsSven Kordon, Alexander Krueger, Oliver Wuebbolt

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Abstract

A method for compressing a HOA signal being an input HOA representation with input time frames (C(k)) of HOA coefficient sequences comprises spatial HOA encoding of the input time frames and subsequent perceptual encoding and source encoding. Each input time frame is decomposed (802) into a frame of predominant sound signals (XPS(k−1)) and a frame of an ambient HOA component ({tilde over (C)}AMB(k−1)). The ambient HOA component ({tilde over (C)}AMB(k−1)) comprises, in a layered mode, first HOA coefficient sequences of the input HOA representation (cn(k−1)) in lower positions and second HOA coefficient sequences (cAMB,n(k−1)) in remaining higher positions. The second HOA coefficient sequences are part of an HOA representation of a residual between the input HOA representation and the HOA representation of the predominant sound signals.

Claims3

Dependent claims

A method of decoding a compressed Higher Order Ambisonics (HOA) representation of a sound or a soundfield, the method comprising:

receiving a bit stream containing the compressed HOA representation;
determining whether there are multiple layers relating to the compressed HOA representation;
decoding, based on a determination that there are multiple layers, the compressed HOA representation from the bitstream to obtain a sequence of decoded HOA representations,
wherein a first subset of the sequence of decoded HOA representations corresponds to a first set of indices and a second subset of the sequence of decoded HOA representations corresponds to a second set of indices,
wherein the first set of indices is based on OMIN channels,
wherein, for each index in the first set of indices, a corresponding decoded HOA representation in the first subset is determined based on only a corresponding ambient HOA component,
wherein the second set of indices is determined based on at least one of the multiple layers,
wherein the first set of indices are 1≤n≤0MIN and the second set of indices are 0MIN+1≤n≤0, wherein 0 indicates a total number of channels and 0MIN indicates a number between 1 and 0, and
wherein a fade in and fade out of HOA coefficients of the sequence of decoded HOA representations is performed if indices of the sequence of decoded HOA representations vary between successive frames.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/429,575Filed 3 Jun 2019 · division
Priority: EP 1430541121 Mar 2014
Published: US 2019/0342686 A17 Nov 2019
Granted: 21 Jan 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04S 3/008
Systems employing more than two channels, e.g. quadraphonic: in which the audio signals are in digital form, i.e. employing more than two discrete…
G10L 19/008
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals,…:…
G10L 19/24
Vocoders using multiple modes: variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical…
H04S 7/30
Indicating arrangements; Control arrangements, e.g. balance control: control circuits for electronic adaptation of the sound field

Family

PCT/EP2015/055914Parent of this division · filed 20 Mar 2015
Application15/891,606Parent of this division · filed 8 Feb 2018
US 9,930,464 B2Parent of this division · filed 27 Mar 2018
US 2019/0342686 A1Pre-grant publication · published 7 Nov 2019
US 10,334,382 B2Parent of this division
Application15/127,577Parent of this division
US 2017/0180902 A1Published application
US 2018/0234785 A1Published application
US 10,542,364 B2This patent

From the US filing history. Foreign family members aren’t listed.