公开(公告)号：US11915712B2

公开(公告)日：2024-02-27

申请号：US17453139

申请日：2021-11-01

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Sascha Disch ,  Martin Dietz ,  Markus Multrus ,  Guillaume Fuchs ,  Emmanuel Ravelli ,  Matthias Neusinger ,  Markus Schnell ,  Benjamin Schubert ,  Bernhard Grill

IPC分类号： G10L19/00 ,  G10L19/02 ,  G10L19/022 ,  G10L19/028 ,  G10L19/04 ,  G10L19/083 ,  G10L19/18 ,  G10L19/24 ,  G10L19/26 ,  G10L21/038

CPC分类号： G10L19/0208 ,  G10L19/022 ,  G10L19/18 ,  G10L19/24 ,  G10L2019/0001 ,  G10L19/02 ,  G10L19/028 ,  G10L19/04 ,  G10L19/083 ,  G10L19/26 ,  G10L21/038

摘要： An audio encoder for encoding an audio signal includes: a first encoding processor for encoding a first audio signal portion in a frequency domain, wherein the first encoding processor includes: a time frequency converter for converting the first audio signal portion into a frequency domain representation having spectral lines up to a maximum frequency of the first audio signal portion; a spectral encoder for encoding the frequency domain representation; a second encoding processor for encoding a second different audio signal portion in the time domain; a cross-processor for calculating, from the encoded spectral representation of the first audio signal portion, initialization data of the second encoding processor, so that the second encoding processing is initialized to encode the second audio signal portion immediately following the first audio signal portion in time in the audio signal; a controller configured for analyzing the audio signal and for determining, which portion of the audio signal is the first audio signal portion encoded in the frequency domain and which portion of the audio signal is the second audio signal portion encoded in the time domain; and an encoded signal former for forming an encoded audio signal including a first encoded signal portion for the first audio signal portion and a second encoded signal portion for the second audio signal portion.

公开(公告)号：US11908484B2

公开(公告)日：2024-02-20

申请号：US17648408

申请日：2022-01-19

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Sascha Disch ,  Ralf Geiger ,  Andreas Niedermeier ,  Matthias Neusinger ,  Konstantin Schmidt ,  Stephan Wilde ,  Benjamin Schubert ,  Christian Neukam

IPC分类号： G10L19/028 ,  G10L15/20 ,  G10L21/038 ,  G10L25/21 ,  G10L19/02

CPC分类号： G10L19/028 ,  G10L19/0204 ,  G10L21/038 ,  G10L25/21 ,  G10L15/20

摘要： An apparatus for generating an enhanced signal from an input signal, wherein the enhanced signal has spectral values for an enhancement spectral region, the spectral values for the enhancement spectral regions not being contained in the input signal, includes a mapper for mapping a source spectral region of the input signal to a target region in the enhancement spectral region, the source spectral region including a noise-filling region; and a noise filler configured for generating first noise values for the noise-filling region in the source spectral region of the input signal and for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from the first noise values or for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from first noise values in the source region.

公开(公告)号：US11410668B2

公开(公告)日：2022-08-09

申请号：US16290587

申请日：2019-03-01

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Sascha Disch ,  Martin Dietz ,  Markus Multrus ,  Guillaume Fuchs ,  Emmanuel Ravelli ,  Matthias Neusinger ,  Markus Schnell ,  Benjamin Schubert ,  Bernhard Grill

IPC分类号： G10L19/02 ,  G10L19/022 ,  G10L19/18 ,  G10L19/24 ,  G10L19/028 ,  G10L19/04 ,  G10L19/083 ,  G10L19/26 ,  G10L19/038 ,  G10L19/00 ,  G10L21/038

摘要： An audio encoder for encoding an audio signal includes: a first encoding processor for encoding a first audio signal portion in a frequency domain, wherein the first encoding processor includes: a time frequency converter for converting the first audio signal portion into a frequency domain representation having spectral lines up to a maximum frequency of the first audio signal portion; a spectral encoder for encoding the frequency domain representation; a second encoding processor for encoding a second different audio signal portion in the time domain; a cross-processor for calculating, from the encoded spectral representation of the first audio signal portion, initialization data of the second encoding processor, so that the second encoding processing is initialized to encode the second audio signal portion immediately following the first audio signal portion in time in the audio signal; a controller configured for analyzing the audio signal and for determining, which portion of the audio signal is the first audio signal portion encoded in the frequency domain and which portion of the audio signal is the second audio signal portion encoded in the time domain; and an encoded signal former for forming an encoded audio signal including a first encoded signal portion for the first audio signal portion and a second encoded signal portion for the second audio signal portion.

公开(公告)号：US11341975B2

公开(公告)日：2022-05-24

申请号：US16738301

申请日：2020-01-09

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Jan Büthe ,  Franz Reutelhuber ,  Sascha Disch ,  Guillaume Fuchs ,  Markus Multrus ,  Ralf Geiger

IPC分类号： G10L19/008 ,  G10L19/02 ,  G10L19/26

摘要： An apparatus for decoding an encoded multichannel signal includes: a base channel decoder for decoding an encoded base channel to obtain a decoded base channel; a decorrelation filter for filtering at least a portion of the decoded base channel to obtain a filling signal; and a multichannel processor for performing a multichannel processing using a spectral representation of the decoded base channel and a spectral representation of the filling signal, wherein the decorrelation filter is a broad band filter and the multichannel processor is configured to apply a narrow band processing to the spectral representation of the decoded base channel and the spectral representation of the filling signal.

公开(公告)号：US20210104249A1

公开(公告)日：2021-04-08

申请号：US17124628

申请日：2020-12-17

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Eleni FOTOPOULOU ,  Markus Multrus ,  Sascha Dick ,  Goran Markovic ,  Pallavi Maben ,  Srikanth Korse ,  Stefan Bayer ,  Sascha Disch ,  Jürgen Herre

IPC分类号： G10L19/008 ,  G10L19/03

摘要： A multisignal encoder for encoding at least three audio signals, including: a signal preprocessor for individually preprocessing each audio signal to obtain at least three preprocessed audio signals, wherein the preprocessing is performed so that a preprocessed audio signal is whitened with respect to the signal before preprocessing; an adaptive joint signal processor for performing a processing of the at least three preprocessed audio signals to obtain at least three jointly processed signals or at least two jointly processed signals and an unprocessed signal; a signal encoder for encoding each signal to obtain one or more encoded signals; and an output interface for transmitting or storing an encoded multisignal audio signal including the one or more encoded signals, side information relating to the preprocessing and side information relating to the processing.

公开(公告)号：US10332535B2

公开(公告)日：2019-06-25

申请号：US15414427

申请日：2017-01-24

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Sascha Disch ,  Martin Dietz ,  Markus Multrus ,  Guillaume Fuchs ,  Emmanuel Ravelli ,  Matthias Neusinger ,  Markus Schnell ,  Benjamin Schubert ,  Bernhard Grill

IPC分类号： G10L19/02 ,  G10L19/04 ,  G10L19/06 ,  G10L19/18 ,  G10L19/20 ,  G10L19/24 ,  G10L19/26 ,  G10L19/028 ,  G10L19/032 ,  G10L21/038

摘要： An audio encoder for encoding an audio signal has: a first encoding processor for encoding a first audio signal portion in a frequency domain, having: a time frequency converter for converting the first audio signal portion into a frequency domain representation; an analyzer for analyzing the frequency domain representation to determine first spectral portions to be encoded with a first spectral resolution and second regions to be encoded with a second resolution; and a spectral encoder for encoding the first spectral portions with the first spectral resolution and encoding the second portions with the second resolution; a second encoding processor for encoding a second different audio signal portion in the time domain; a controller for analyzing and determining, which portion of the audio signal is the first audio signal portion encoded in the frequency domain and which portion is the second audio signal portion encoded in the time domain; and an encoded signal former for forming an encoded audio signal having a first encoded signal portion for the first audio signal portion and a second encoded signal portion for the second portion.

公开(公告)号：US20170069332A1

公开(公告)日：2017-03-09

申请号：US15353292

申请日：2016-11-16

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Sascha Disch ,  Ralf Geiger ,  Andreas Niedermeier ,  Matthias Neusinger ,  Konstantin Schmidt ,  Stephan Wilde ,  Benjamin Schubert ,  Christian Neukam

IPC分类号： G10L19/028 ,  G10L21/038 ,  G10L25/21

CPC分类号： G10L19/028 ,  G10L19/0204 ,  G10L21/038 ,  G10L25/21

摘要： An apparatus for generating an enhanced signal from an input signal, wherein the enhanced signal has spectral values for an enhancement spectral region, the spectral values for the enhancement spectral regions not being contained in the input signal, includes a mapper for mapping a source spectral region of the input signal to a target region in the enhancement spectral region, the source spectral region including a noise-filling region; and a noise filler configured for generating first noise values for the noise-filling region in the source spectral region of the input signal and for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from the first noise values or for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from first noise values in the source region.

摘要翻译： 一种用于从输入信号产生增强信号的装置，其中所述增强信号具有用于增强频谱区域的频谱值，所述增强频谱区域的频谱值不包含在所述输入信号中，包括用于映射源频谱区域的映射器 所述源频谱区域包括噪声填充区域;所述源频谱区域包括噪声填充区域; 以及噪声填充器，被配置为产生所述输入信号的源光谱区域中的噪声填充区域的第一噪声值，并且用于产生所述目标区域中的噪声区域的第二噪声值，其中所述第二噪声值与所述第一噪声值相关， 噪声值或用于为目标区域中的噪声区域产生第二噪声值，其中第二噪声值与源区域中的第一噪声值相关。

公开(公告)号：US12051431B2

公开(公告)日：2024-07-30

申请号：US17105845

申请日：2020-11-27

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Sascha Disch ,  Steven Van De Par ,  Andreas Niedermeier ,  Elena Burdiel Pérez ,  Bernd Edler

IPC分类号： G10L19/09 ,  G10L19/26 ,  G06N5/04

CPC分类号： G10L19/09 ,  G10L19/26 ,  G06N5/04

摘要： An audio similarity evaluator obtains envelope signals for a plurality of frequency ranges on the basis of an input audio signal. The audio similarity evaluator is configured to obtain a modulation information associated with the envelope signals for a plurality of modulation frequency ranges, wherein the modulation information describes the modulation of the envelope signals. The audio similarity evaluator is configured to compare the obtained modulation information with a reference modulation information associated with a reference audio signal, in order to obtain an information about a similarity between the input audio signal and the reference audio signal. An audio encoder uses such an audio similarity evaluator. Another audio similarity evaluator uses a neural net trained using the audio similarity evaluator.

公开(公告)号：US11705145B2

公开(公告)日：2023-07-18

申请号：US17098126

申请日：2020-11-13

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Sascha Disch ,  Ralf Geiger ,  Andreas Niedermeier ,  Matthias Neusinger ,  Konstantin Schmidt ,  Stephan Wilde ,  Benjamin Schubert ,  Christian Neukam

IPC分类号： G10L19/028 ,  G10L21/038 ,  G10L25/21 ,  G10L19/02 ,  G10L15/20

CPC分类号： G10L19/028 ,  G10L19/0204 ,  G10L21/038 ,  G10L25/21 ,  G10L15/20

摘要： An apparatus for generating an enhanced signal from an input signal, wherein the enhanced signal has spectral values for an enhancement spectral region, the spectral values for the enhancement spectral regions not being contained in the input signal, includes a mapper for mapping a source spectral region of the input signal to a target region in the enhancement spectral region, the source spectral region including a noise-filling region; and a noise filler configured for generating first noise values for the noise-filling region in the source spectral region of the input signal and for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from the first noise values or for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from first noise values in the source region.

公开(公告)号：US11688408B2

公开(公告)日：2023-06-27

申请号：US17301813

申请日：2021-04-15

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： Nils Werner ,  Bernd Edler ,  Sascha Disch

IPC分类号： G10L15/00 ,  G10L19/008 ,  G10L19/02 ,  G10L19/022 ,  G10L19/26

CPC分类号： G10L19/008 ,  G10L19/022 ,  G10L19/0204 ,  G10L19/26

摘要： Embodiments provide an audio processor for processing an audio signal to obtain a subband representation of the audio signal. The audio processor is configured to perform a cascaded lapped critically sampled transform on at least two partially overlapping blocks of samples of the audio signal, to obtain a set of subband samples on the basis of a first block of samples of the audio signal, and to obtain a corresponding set of subband samples on the basis of a second block of samples of the audio signal. Further, the audio processor is configured to perform a weighted combination of two corresponding sets of subband samples, one obtained on the basis of the first block of samples of the audio signal and one obtained on the basis on the second block of samples of the audio signal, to obtain an aliasing reduced subband representation of the audio signal.