US 2016/0104488 A1Published application

Apparatus and method for improved signal fade out for switched audio coding systems during error concealment

AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

InventorsMichael SCHNABEL, Goran MARKOVIC, Ralph SPERSCHNEIDER, Jeremie LECOMTE, Christian HELMRICH

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Abstract

An apparatus for decoding an audio signal includes a receiving interface, wherein the receiving interface is configured to receive a first frame and a second frame. Moreover, the apparatus includes a noise level tracing unit for determining noise level information being represented in a tracing domain. Furthermore, the apparatus includes a first reconstruction unit for reconstructing a third audio signal portion of the audio signal depending on the noise level information and a second reconstruction unit for reconstructing a fourth audio signal portion depending on noise level information being represented in the second reconstruction domain.

An apparatus for decoding an audio signal, comprising:

a receiving interface for receiving a plurality of frames, wherein the receiving interface is configured to receive a first frame of the plurality of frames, said first frame comprising a first audio signal portion of the audio signal, said first audio signal portion being represented in a first domain, and wherein the receiving interface is configured to receive a second frame of the plurality of frames, said second frame comprising a second audio signal portion of the audio signal,
a transform unit for transforming the second audio signal portion or a value or signal derived from the second audio signal portion from a second domain to a tracing domain to acquire a second signal portion information, wherein the second domain is different from the first domain, wherein the tracing domain is different from the second domain, and wherein the tracing domain is equal to or different from the first domain,
a noise level tracing unit, wherein the noise level tracing unit is configured to receive a first signal portion information being represented in the tracing domain, wherein the first signal portion information depends on the first audio signal portion, wherein the noise level tracing unit is configured to receive the second signal portion being represented in the tracing domain, and wherein the noise level tracing unit is configured to determine noise level information depending on the first signal portion information being represented in the tracing domain and depending on the second signal portion information being represented in the tracing domain, wherein the noise level information is represented in the tracing domain, and
a reconstruction unit for reconstructing a third audio signal portion of the audio signal depending on the noise level information, if a third frame of the plurality of frames is not received by the receiving interface or if said third frame is received by the receiving interface but is corrupted.

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Facts

Application

14/973,726Filed 18 Dec 2015

Priority

EP 13 173 154.921 Jun 2013

Published

14 Apr 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

G10L 19/005
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals,…:…
G10L 19/002
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals,…:…
G10L 19/012
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals,…:…
G10L 19/06
Using predictive techniques: determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients

Abstract

Claims22