公开(公告)号：US09734833B2

公开(公告)日：2017-08-15

申请号：US14678667

申请日：2015-04-03

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Inventor： Sascha Disch ,  Jouni Paulus ,  Bernd Edler ,  Oliver Hellmuth ,  Juergen Herre ,  Thorsten Kastner

IPC: H04R5/00 ,  G10L19/008 ,  G10L19/025 ,  G10L19/02 ,  G10L19/20

CPC classification number: G10L19/008 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/025 ,  G10L19/20

Abstract: A decoder for generating an audio output signal having one or more audio output channels from a downmix signal having a plurality of time-domain downmix samples is provided. The downmix signal encodes two or more audio object signals. The decoder has a window-sequence generator for determining a plurality of analysis windows, each having a plurality of time-domain downmix samples of the downmix signal and a window length indicating the number of the time-domain downmix samples. Moreover, the decoder has a t/f-analysis module for transforming the plurality of time-domain downmix samples of each analysis window from a time-domain to a time-frequency domain depending on the window length of said analysis window, to obtain a transformed downmix. Furthermore, the decoder has an un-mixing unit for un-mixing the transformed downmix based on parametric side information on the two or more audio object signals to obtain the audio output signal. Moreover, an encoder is provided.

公开(公告)号：US09646632B2

公开(公告)日：2017-05-09

申请号：US14538756

申请日：2014-11-11

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Inventor： Stefan Bayer ,  Sascha Disch ,  Ralf Geiger ,  Guillaume Fuchs ,  Max Neuendorf ,  Gerald Schuller ,  Bernd Edler

IPC: G10L19/00 ,  G10L21/04 ,  G10L19/002 ,  G10L19/028 ,  G10L19/022 ,  G10L19/032 ,  G10L21/043 ,  G10L25/90 ,  G10L19/26

CPC classification number: G10L21/04 ,  G10L19/002 ,  G10L19/0212 ,  G10L19/022 ,  G10L19/028 ,  G10L19/032 ,  G10L19/265 ,  G10L21/043 ,  G10L25/90

Abstract: An audio encoder has a window function controller, a windower, a time warper with a final quality check functionality, a time/frequency converter, a TNS stage or a quantizer encoder, the window function controller, the time warper, the TNS stage or an additional noise filling analyzer are controlled by signal analysis results obtained by a time warp analyzer or a signal classifier. Furthermore, a decoder applies a noise filling operation using a manipulated noise filling estimate depending on a harmonic or speech characteristic of the audio signal.

公开(公告)号：US09570085B2

公开(公告)日：2017-02-14

申请号：US14682015

申请日：2015-04-08

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Inventor： Sascha Disch ,  Benjamin Schubert ,  Ralf Geiger ,  Bernd Edler ,  Martin Dietz

IPC: G10L19/02 ,  G10L19/032

CPC classification number: G10L19/02 ,  G10L19/0212 ,  G10L19/032

Abstract: An apparatus for generating an audio output signal based on an encoded audio signal spectrum is provided. The apparatus has a processing unit for processing the encoded audio signal spectrum to obtain a decoded audio signal spectrum having a plurality of spectral coefficients, wherein each of the spectral coefficients has a spectral location within the encoded audio signal spectrum and a spectral value. Moreover, the apparatus has a pseudo coefficients determiner for determining one or more pseudo coefficients. Furthermore, the apparatus has a replacement unit for replacing at least one or more pseudo coefficients by a determined spectral pattern to obtain a modified audio signal spectrum, wherein each of at least two pattern coefficients has a spectral value. Moreover, the apparatus has a spectrum-time-conversion unit for converting the modified audio signal spectrum to a time-domain.

Abstract translation: 提供了一种用于基于经编码的音频信号频谱产生音频输出信号的装置。 该装置具有用于处理编码音频信号频谱以获得具有多个频谱系数的解码音频信号频谱的处理单元，其中每个频谱系数具有编码音频信号频谱内的频谱位置和频谱值。 此外，该装置具有用于确定一个或多个伪系数的伪系数确定器。 此外，该设备具有替换单元，用于通过确定的频谱图案来替换至少一个或多个伪系数，以获得修改的音频信号频谱，其中至少两个模式系数中的每一个具有频谱值。 此外，该装置具有用于将修改的音频信号频谱转换为时域的频谱 - 时间转换单元。

公开(公告)号：US09398294B2

公开(公告)日：2016-07-19

申请号：US13645707

申请日：2012-10-05

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Inventor： Julien Robillard ,  Matthias Neusinger ,  Christian Helmrich ,  Johannes Hilpert ,  Nikolaus Rettelbach ,  Sascha Disch ,  Bernd Edler

IPC: H04N19/50 ,  G10L19/008 ,  G10L19/06 ,  G06F17/00 ,  G10L19/00 ,  G10L21/00

CPC classification number: H04N19/50 ,  G10L19/008 ,  G10L19/06

Abstract: An encoder/decoder is based on a combination of two audio or video channels to obtain a first combination signal as a mid-signal and a residual signal derivable using a predicted side signal derived from the mid-signal. A decoder uses the prediction residual signal, the first combination signal, a prediction direction indicator and prediction information to derive decoded first channel and second channel signals. A real-to-imaginary transform can be applied for estimating the imaginary part of the spectrum of the first combination signal. The prediction signal used in the derivation of the prediction residual signal, the real-valued first combination signal is multiplied by a real portion of the complex prediction information and the estimated imaginary part of the first combination signal is multiplied by an imaginary portion of the complex prediction information.

Abstract translation: 编码器/解码器基于两个音频或视频信道的组合，以获得作为中间信号的第一组合信号和使用从中间信号导出的预测侧信号可导出的残差信号。 解码器使用预测残差信号，第一组合信号，预测方向指示符和预测信息来导出解码的第一信道和第二信道信号。 可以将实到虚变换应用于估计第一组合信号的频谱的虚部。 在推测预测残差信号中使用的预测信号，实值第一组合信号乘以复数预测信息的实部，并将第一组合信号的估计虚部乘以复数的虚部 预测信息。

公开(公告)号：US09293149B2

公开(公告)日：2016-03-22

申请号：US14538748

申请日：2014-11-11

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Inventor： Stefan Bayer ,  Sascha Disch ,  Ralf Geiger ,  Guillaume Fuchs ,  Max Neuendorf ,  Gerald Schuller ,  Bernd Edler

IPC: G10L15/00 ,  G10L21/00 ,  G10L21/02 ,  G10L21/04 ,  G10L19/002 ,  G10L19/028 ,  G10L19/022 ,  G10L19/032 ,  G10L21/043 ,  G10L25/90 ,  G10L19/26

CPC classification number: G10L21/04 ,  G10L19/002 ,  G10L19/0212 ,  G10L19/022 ,  G10L19/028 ,  G10L19/032 ,  G10L19/265 ,  G10L21/043 ,  G10L25/90

Abstract: An audio encoder has a window function controller, a windower, a time warper with a final quality check functionality, a time/frequency converter, a TNS stage or a quantizer encoder, the window function controller, the time warper, the TNS stage or an additional noise filling analyzer are controlled by signal analysis results obtained by a time warp analyzer or a signal classifier. Furthermore, a decoder applies a noise filling operation using a manipulated noise filling estimate depending on a harmonic or speech characteristic of the audio signal.

公开(公告)号：US08775193B2

公开(公告)日：2014-07-08

申请号：US13742246

申请日：2013-01-15

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Inventor： Markus Schnell ,  Manfred Lutzky ,  Markus Lohwasser ,  Markus Schmidt ,  Marc Gayer ,  Michael Mellar ,  Bernd Edler ,  Markus Multrus ,  Gerald Schuller ,  Ralf Geiger ,  Bernhard Grill

IPC: G10L19/00

CPC classification number: G10L19/0204 ,  G10L19/022 ,  G10L21/038 ,  G10L25/45 ,  H03H17/0266

Abstract: An embodiment of an apparatus for generating audio subband values in audio subband channels has an analysis windower for windowing a frame of time-domain audio input samples being in a time sequence extending from an early sample to a later sample using an analysis window function having a sequence of window coefficients to obtain windowed samples. The analysis window function has a first group of window coefficients and a second group of window coefficients. The first group of window coefficients is used for windowing later time-domain samples and the second group of window coefficients is used for windowing an earlier time-domain samples. The apparatus further has a calculator for calculating the audio subband values using the windowed samples.

Abstract translation: 用于在音频子频带信道中产生音频子带值的装置的实施例具有分析加窗器，用于使用具有分析窗口功能的时间序列，将时域序列扩展到时间序列，从而将其从早期样本延伸到后面的样本 窗系数序列以获得窗口样本。 分析窗函数具有第一组窗系数和第二组窗系数。 窗口系数的第一组用于对稍后的时域样本进行加窗，第二组窗系数用于对较早的时域采样进行加窗。 该装置还具有用于使用窗口样本来计算音频子带值的计算器。

公开(公告)号：USRE49999E1

公开(公告)日：2024-06-04

申请号：US17845607

申请日：2022-06-21

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Inventor： Markus Schnell ,  Manfred Lutzky ,  Markus Lohwasser ,  Markus Schmidt ,  Marc Gayer ,  Michael Mellar ,  Bernd Edler ,  Markus Multrus ,  Gerald Schuller ,  Ralf Geiger ,  Bernhard Grill

IPC: G10L19/00 ,  G10L19/02 ,  G10L19/022 ,  G10L25/45 ,  H03H17/02 ,  G10L21/038

CPC classification number: G10L19/0204 ,  G10L19/022 ,  G10L25/45 ,  H03H17/0266 ,  G10L21/038

Abstract: An embodiment of an apparatus for generating audio subband values in audio subband channels includes an analysis windower for windowing a frame of time-domain audio input samples being in a time sequence extending from an early sample to a later sample using an analysis window function including a sequence of window coefficients to obtain windowed samples. The analysis window function includes a first number of window coefficients derived from a larger window function including a sequence of a larger second number of window coefficients, wherein the window coefficients of the window function are derived by an interpolation of window coefficients of the larger window function. The apparatus further includes a calculator for calculating the audio subband values using the windowed samples.

公开(公告)号：US11682408B2

公开(公告)日：2023-06-20

申请号：US16995581

申请日：2020-08-17

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Inventor： Christian Helmrich ,  Jérémie Lecomte ,  Goran Markovic ,  Markus Schnell ,  Bernd Edler ,  Stefan Reuschl

IPC: G10L19/00 ,  G10L19/025 ,  G10L19/022 ,  G10L19/02 ,  H04N19/172 ,  H04N19/176 ,  H04N19/44

CPC classification number: G10L19/025 ,  G10L19/022 ,  G10L19/0212 ,  H04N19/172 ,  H04N19/176 ,  H04N19/44

Abstract: An apparatus for generating an encoded signal includes: a window sequence controller for generating a window sequence information for windowing an audio or image signal, the window sequence information indicating a first window for generating a first frame of spectral values, a second window function and at least one third window function for generating a second frame of spectral values, wherein the first window function, the second window function and the one or more third window functions overlap within a multi-overlap region; a preprocessor for windowing a second block of samples corresponding to the second window function and the at least one third window functions using an auxiliary window function to acquire a second block of windowed samples, a spectrum converter for applying an aliasing-introducing transform; and a processor for processing the first frame and the second frame to acquire encoded frames of the audio or image signal.

公开(公告)号：USRE49511E1

公开(公告)日：2023-04-25

申请号：US16950679

申请日：2020-11-17

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Inventor： Julien Robilliard ,  Matthias Neusinger ,  Christian Helmrich ,  Johannes Hilpert ,  Nikolaus Rettelbach ,  Sascha Disch ,  Bernd Edler

IPC: H04N19/50 ,  G10L19/008 ,  G10L19/06

Abstract: An encoder/decoder is based on a combination of two audio or video channels to obtain a first combination signal as a mid-signal and a residual signal derivable using a predicted side signal derived from the mid-signal. A decoder uses the prediction residual signal, the first combination signal, a prediction direction indicator and prediction information to derive decoded first channel and second channel signals. A real-to-imaginary transform can be applied for estimating the imaginary part of the spectrum of the first combination signal. The prediction signal used in the derivation of the prediction residual signal, the real-valued first combination signal is multiplied by a real portion of the complex prediction information and the estimated imaginary part of the first combination signal is multiplied by an imaginary portion of the complex prediction information.

公开(公告)号：USRE49453E1

公开(公告)日：2023-03-07

申请号：US16950696

申请日：2020-11-17

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Inventor： Julien Robilliard ,  Matthias Neusinger ,  Christian Helmrich ,  Johannes Hilpert ,  Nikolaus Rettelbach ,  Sascha Disch ,  Bernd Edler

IPC: H04N19/50 ,  G10L19/008 ,  G10L19/06

Abstract: An encoder/decoder is based on a combination of two audio or video channels to obtain a first combination signal as a mid-signal and a residual signal derivable using a predicted side signal derived from the mid-signal. A decoder uses the prediction residual signal, the first combination signal, a prediction direction indicator and prediction information to derive decoded first channel and second channel signals. A real-to-imaginary transform can be applied for estimating the imaginary part of the spectrum of the first combination signal. The prediction signal used in the derivation of the prediction residual signal, the real-valued first combination signal is multiplied by a real portion of the complex prediction information and the estimated imaginary part of the first combination signal is multiplied by an imaginary portion of the complex prediction information.