公开(公告)号：EP2311035A1

公开(公告)日：2011-04-20

申请号：EP09793882.3

申请日：2009-07-06

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

发明人： GRILL, Bernhard ,  BAYER, Stefan ,  FUCHS, Guillaume ,  GEYERSBERGER, Stefan ,  GEIGER, Ralf ,  HILPERT, Johannes ,  KRAEMER, Ulrich ,  LECOMTE, Jeremie ,  MULTRUS, Markus ,  NEUENDORF, Max ,  POPP, Harald ,  RETTELBACH, Nikolaus ,  NAGEL, Frederik ,  DISCH, Sascha ,  HERRE, Juergen ,  YOKOTANI, Yoshikazu ,  WABNIK, Stefan ,  SCHULLER, Gerald ,  HIRSCHFELD, Jens

IPC分类号： G10L19/14

CPC分类号： G10L19/173 ,  G10L19/0017 ,  G10L19/008 ,  G10L19/0212 ,  G10L19/18 ,  G10L2019/0008

摘要： An audio encoder comprises a common preprocessing stage, an information sink based encoding branch such as spectral domain encoding branch, a information source based encoding branch such as an LPC-domain encoding branch and a switch for switching between these branches at inputs into these branches or outputs of these branches controlled by a decision stage. An audio decoder comprises a spectral domain decoding branch, an LPC-domain decoding branch, one or more switches for switching between the branches and a common post-processing stage for post-processing a time-domain audio signal for obtaining a post-processed audio signal.

公开(公告)号：EP2301027A1

公开(公告)日：2011-03-30

申请号：EP09776809.7

申请日：2009-06-23

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

发明人： NEUENDORF, Max ,  GRILL, Bernhard ,  KRAEMER, Ulrich ,  MULTRUS, Markus ,  POPP, Harald ,  RETTELBACH, Nikolaus ,  NAGEL, Frederik ,  LOHWASSER, Markus ,  GAYER, Marc ,  JANDER, Manuel ,  BACIGALUPO, Virgilio

IPC分类号： G10L21/02

CPC分类号： G10L21/038 ,  G10L19/0208 ,  G10L19/025 ,  G10L19/20

摘要： An apparatus (100) for generating bandwidth extension output data (102) for an audio signal (105) comprises a noise floor measurer (110), a signal energy characterizer (120) and a processor (130). The audio signal (105) comprises components in a first frequency band (105a) and components in a second frequency band (105b), the bandwidth extension output data (102) are adapted to control a synthesis of the components in the second frequency band (105b). The noise floor measurer (110) measures noise floor data (115) of the second frequency band (105b) for a time portion (T) of the audio signal (105). The signal energy characterizer (120) derives energy distribution data (125), the energy distribution data (125) characterizing an energy distribution in a spectrum of the time portion (T) of the audio signal (105). The processor (130) combines the noise floor data (115) and the energy distribution data (125) to obtain the bandwidth extension output data (102).

公开(公告)号：EP2301024A1

公开(公告)日：2011-03-30

申请号：EP09797423.2

申请日：2009-07-06

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

发明人： GRILL, Bernhard ,  BAYER, Stefan ,  FUCHS, Guillaume ,  GEYERSBERGER, Stefan ,  GEIGER, Ralf ,  HILPERT, Johannes ,  KRAEMER, Ulrich ,  LECOMTE, Jeremie ,  MULTRUS, Markus ,  NEUENDORF, Max ,  POPP, Harald ,  RETTELBACH, Nikolaus ,  LEFEBVRE, Roch ,  BESSETTE, Bruno ,  LAPIERRE, Jimmy ,  SALAMI, Redwan ,  GOURNAY, Philippe

IPC分类号： G10L19/14

CPC分类号： G10L19/173 ,  G10L19/0017 ,  G10L19/008 ,  G10L19/0212 ,  G10L19/18 ,  G10L2019/0008

摘要： An apparatus for encoding comprises a first domain converter (510), a switchable bypass (50), a second domain converter (410), a first processor (420) and a second processor (520) to obtain an encoded audio signal having different signal portions represented by coded data in different domains, which have been coded by different coding algorithms. Corresponding decoding stages in the decoder together with a bypass for bypassing a domain converter allow the generation of a decoded audio signal with high quality and low bit rate.

公开(公告)号：EP1687810B1

公开(公告)日：2008-02-13

申请号：EP05707482.5

申请日：2005-02-17

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

发明人： GRILL, Bernhard ,  SCHUG, Michael ,  TEICHMANN, Bodo ,  RETTELBACH, Nikolaus

IPC分类号： G10L19/02

CPC分类号： G10L19/032 ,  G10L2019/0005

摘要： In order to determine a quantiser step size for quantising a signal comprising audio or video information, a first quantiser step size and an interference threshold are supplied (502). According to the invention, the actual interference introduced by means of the first quantizer step size is determined (504) and compared with the interference threshold (506). If the comparison indicates that the actually introduced interference is higher than the threshold, a second coarser quantizer step size is used (508), that is then used for the quantisation (514) if it emerges that the interference introduced by the coarser second quantizer step size is lower than the threshold or the interference introduced by the first quantiser step size (512). In this way, the quantisation interference is reduced during the coarsening of the quantisation and thus during an increase in the compression gain.

公开(公告)号：EP4421803A3

公开(公告)日：2024-10-30

申请号：EP24188661.3

申请日：2017-02-14

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

发明人： DICK, Sascha ,  HELMRICH, Christian ,  RETTELBACH, Nikolaus ,  SCHUH, Florian ,  FÜG, Richard ,  NAGEL, Frederik

IPC分类号： G10L19/008 ,  G10L19/028

摘要： An apparatus for decoding an encoded multichannel signal of a current frame to obtain three or more current audio output channels is provided. A multichannel processor is adapted to select two decoded channels from three or more decoded channels depending on first multichannel parameters. Moreover, the multichannel processor is adapted to generate a first group of two or more processed channels based on said selected channels. A noise filling module is adapted to identify for at least one of the selected channels, one or more frequency bands, within which all spectral lines are quantized to zero, and to generate a mixing channel using, depending on side information, a proper subset of three or more previous audio output channels that have been decoded, and to fill the spectral lines of frequency bands, within which all spectral lines are quantized to zero, with noise generated using spectral lines of the mixing channel.

公开(公告)号：EP4407614A1

公开(公告)日：2024-07-31

申请号：EP24167804.4

申请日：2009-06-25

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

发明人： RETTELBACH, Nikolaus ,  FUCHS, Guillaume ,  GEYERSBERGER, Stefan ,  GRILL, Bernhard ,  HIRSCHFELD, Jens ,  HERRE, Jürgen ,  MULTRUS, Markus ,  POPP, Harald ,  SCHULLER, Gerald ,  WABNIK, Stefan

IPC分类号： G10L19/028 ,  G10L19/02 ,  G10L19/032

CPC分类号： G10L19/02 ,  G10L19/028 ,  G10L19/032

摘要： An encoder for providing an audio stream on the basis of a transform-domain representation of an input audio signal comprises a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also comprises an audio stream provider configured to provide the audio stream such that the audio stream comprises an information describing an audio content of the frequency bands and an information describing the multi-band quantization error.
A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal comprises a noise filler configured to introduce noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

公开(公告)号：EP4407613A1

公开(公告)日：2024-07-31

申请号：EP24167802.8

申请日：2009-06-25

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

发明人： RETTELBACH, Nikolaus ,  FUCHS, Guillaume ,  GEYERSBERGER, Stefan ,  GRILL, Bernhard ,  HIRSCHFELD, Jens ,  HERRE, Jürgen ,  MULTRUS, Markus ,  POPP, Harald ,  SCHULLER, Gerald ,  WABNIK, Stefan

IPC分类号： G10L19/028 ,  G10L19/02 ,  G10L19/032

CPC分类号： G10L19/02 ,  G10L19/028 ,  G10L19/032

摘要： An encoder for providing an audio stream on the basis of a transform-domain representation of an input audio signal comprises a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also comprises an audio stream provider configured to provide the audio stream such that the audio stream comprises an information describing an audio content of the frequency bands and an information describing the multi-band quantization error.
A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal comprises a noise filler configured to introduce noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

公开(公告)号：EP4407610A1

公开(公告)日：2024-07-31

申请号：EP24167725.1

申请日：2009-06-25

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

发明人： RETTELBACH, Nikolaus ,  FUCHS, Guillaume ,  GEYERSBERGER, Stefan ,  GRILL, Bernhard ,  HIRSCHFELD, Jens ,  HERRE, Jürgen ,  MULTRUS, Markus ,  POPP, Harald ,  SCHULLER, Gerald ,  WABNIK, Stefan

IPC分类号： G10L19/028 ,  G10L19/02 ,  G10L19/032

CPC分类号： G10L19/02 ,  G10L19/028 ,  G10L19/032

摘要： An encoder for providing an audio stream on the basis of a transform-domain representation of an input audio signal comprises a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also comprises an audio stream provider configured to provide the audio stream such that the audio stream comprises an information describing an audio content of the frequency bands and an information describing the multi-band quantization error.
A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal comprises a noise filler configured to introduce noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

公开(公告)号：EP4376306A3

公开(公告)日：2024-07-03

申请号：EP24166207.1

申请日：2009-05-18

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

发明人： MULTRUS, Markus ,  GRILL, Bernhard ,  FUCHS, Guillaume ,  GEYERSBERGER, Stefan ,  RETTELBACH, Nikolaus ,  BACIGALUPO, Virgilio

IPC分类号： G10L19/02 ,  G10L19/022 ,  H03M7/30 ,  H03M7/40

CPC分类号： G10L19/022 ,  G10L19/02 ,  H03M7/4018 ,  H03M7/3059

摘要： An audio encoder (100) for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder (100) comprising a processor (110) for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder (100) further comprises an entropy encoder (120) for entropy encoding the current coefficient based on the coding context to obtain an encoded audio stream.

公开(公告)号：EP4376307A2

公开(公告)日：2024-05-29

申请号：EP24166208.9

申请日：2009-05-18

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

发明人： MULTRUS, Markus ,  GRILL, Bernhard ,  FUCHS, Guillaume ,  GEYERSBERGER, Stefan ,  RETTELBACH, Nikolaus ,  BACIGALUPO, Virgilio

IPC分类号： H03M7/40

CPC分类号： G10L19/022 ,  G10L19/02 ,  H03M7/4018 ,  H03M7/3059

摘要： An audio encoder (100) for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder (100) comprising a processor (110) for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder (100) further comprises an entropy encoder (120) for entropy encoding the current coefficient based on the coding context to obtain an encoded audio stream.