公开(公告)号：EP4447044A3

公开(公告)日：2024-10-23

申请号：EP24184655.9

申请日：2021-07-05

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

发明人： Ravelli, Emmanuel ,  Markovic, Goran ,  Kiene, Jan Frederik ,  Reutelhuber, Franz ,  Döhla, Stefan ,  Fotopoulou, Eleni

IPC分类号： G10L19/038 ,  G10L19/002 ,  G10L19/18 ,  G10L19/008 ,  G10L19/02

摘要： An audio quantizer for quantizing a plurality of audio information items, comprises: a first stage vector quantizer (141, 143) for quantizing the plurality of audio information items to determine a first stage vector quantization result and a plurality of intermediate quantized items corresponding to the first stage vector quantization result; a residual item determiner (142) for calculating a plurality of residual items from the plurality of intermediate quantized items and the plurality of audio information items; and a second stage vector quantizer (145) for quantizing the plurality of residual items to obtain a second stage vector quantization result, wherein the first stage vector quantization result and the second stage vector quantization result are a quantized representation of the plurality of audio information items.

公开(公告)号：EP4447044A2

公开(公告)日：2024-10-16

申请号：EP24184655.9

申请日：2021-07-05

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

发明人： Ravelli, Emmanuel ,  Markovic, Goran ,  Kiene, Jan Frederik ,  Reutelhuber, Franz ,  Döhla, Stefan ,  Fotopoulou, Eleni

IPC分类号： G10L19/18

摘要： An audio quantizer for quantizing a plurality of audio information items, comprises: a first stage vector quantizer (141, 143) for quantizing the plurality of audio information items to determine a first stage vector quantization result and a plurality of intermediate quantized items corresponding to the first stage vector quantization result; a residual item determiner (142) for calculating a plurality of residual items from the plurality of intermediate quantized items and the plurality of audio information items; and a second stage vector quantizer (145) for quantizing the plurality of residual items to obtain a second stage vector quantization result, wherein the first stage vector quantization result and the second stage vector quantization result are a quantized representation of the plurality of audio information items.

公开(公告)号：EP3503097A2

公开(公告)日：2019-06-26

申请号：EP19157001.9

申请日：2017-01-20

申请人： FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V.

发明人： Fuchs, Guillaume ,  Ravelli, Emmanuel ,  Multrus, Markus ,  Schnell, Markus ,  Döhla, Stefan ,  Dietz, Martin ,  Markovic, Goran ,  Fotopoulou, Eleni ,  Bayer, Stefan ,  Jaegers, Wolfgang

IPC分类号： G10L19/022 ,  G10L19/008 ,  G10L19/02

CPC分类号： G10L19/008 ,  G10L19/02 ,  G10L19/022 ,  G10L19/04 ,  G10L25/18 ,  H04S3/008 ,  H04S2400/01 ,  H04S2400/03 ,  H04S2420/03

摘要： An apparatus for encoding a multi-channel signal comprising at least two channels, comprises: a time-spectral converter (1000) for converting sequences of blocks of sample values of the at least two channels into a frequency domain representation having sequences of blocks of spectral values for the at least two channels, wherein a block of sampling values has an associated input sampling rate, and a block of spectral values of the sequences of blocks of spectral values has spectral values up to a maximum input frequency (1211) being related to the input sampling rate; a multi-channel processor (1010) for applying a joint multi-channel processing to the sequences of blocks of spectral values or to resampled sequences of blocks of spectral values to obtain at least one result sequence of blocks of spectral values comprising information related to the at least two channels; a spectral domain resampler (1020) for resampling the blocks of the result sequences in the frequency domain or for resampling the sequences of blocks of spectral values for the at least two channels in the frequency domain to obtain a resampled sequence of blocks of spectral values, wherein a block of the resampled sequence of blocks of spectral values has spectral values up to a maximum output frequency (1231, 1221) being different from the maximum input frequency (1211); a spectral-time converter for converting the resampled sequence of blocks of spectral values into a time domain representation or for converting the result sequence of blocks of spectral values into a time domain representation comprising an output sequence of blocks of sampling values having associated an output sampling rate being different from the input sampling rate; and a core encoder (1040) for encoding the output sequence of blocks of sampling values to obtain an encoded multi-channel signal (1510).

公开(公告)号：EP3761311A1

公开(公告)日：2021-01-06

申请号：EP20190710.2

申请日：2017-10-30

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

发明人： Büthe, Jan ,  Fuchs, Guillaume ,  Jaegers, Wolfgang ,  Reutelhuber, Franz ,  Herre, Jürgen ,  Fotopoulou, Eleni ,  Multrus, Markus ,  Korse, Srikanth

IPC分类号： G10L19/008

摘要： An apparatus for downmixing a multi-channel signal (100) comprising at least two channels (101, 102), comprises: a downmixer (120) for calculating (34) a downmix signal (122) from the multi-channel signal (100), wherein the downmixer is configured to calculate (34) the downmix using an absolute phase compensation, so that a channel having a lower energy among the at least two channels is only rotated or is rotated stronger than a channel having a greater energy in calculating the downmix signal (122); and an output interface (160) for generating an output signal, the output signal comprising information on the downmix signal (122).

公开(公告)号：EP3503097A3

公开(公告)日：2019-07-03

申请号：EP19157001.9

申请日：2017-01-20

申请人： FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V.

发明人： Fuchs, Guillaume ,  Ravelli, Emmanuel ,  Multrus, Markus ,  Schnell, Markus ,  Döhla, Stefan ,  Dietz, Martin ,  Markovic, Goran ,  Fotopoulou, Eleni ,  Bayer, Stefan ,  Jaegers, Wolfgang

IPC分类号： G10L19/008 ,  G10L19/02 ,  G10L19/022

摘要： An apparatus for encoding a multi-channel signal comprising at least two channels, comprises: a time-spectral converter (1000) for converting sequences of blocks of sample values of the at least two channels into a frequency domain representation having sequences of blocks of spectral values for the at least two channels, wherein a block of sampling values has an associated input sampling rate, and a block of spectral values of the sequences of blocks of spectral values has spectral values up to a maximum input frequency (1211) being related to the input sampling rate; a multi-channel processor (1010) for applying a joint multi-channel processing to the sequences of blocks of spectral values or to resampled sequences of blocks of spectral values to obtain at least one result sequence of blocks of spectral values comprising information related to the at least two channels; a spectral domain resampler (1020) for resampling the blocks of the result sequences in the frequency domain or for resampling the sequences of blocks of spectral values for the at least two channels in the frequency domain to obtain a resampled sequence of blocks of spectral values, wherein a block of the resampled sequence of blocks of spectral values has spectral values up to a maximum output frequency (1231, 1221) being different from the maximum input frequency (1211); a spectral-time converter for converting the resampled sequence of blocks of spectral values into a time domain representation or for converting the result sequence of blocks of spectral values into a time domain representation comprising an output sequence of blocks of sampling values having associated an output sampling rate being different from the input sampling rate; and a core encoder (1040) for encoding the output sequence of blocks of sampling values to obtain an encoded multi-channel signal (1510).