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| Number | Title | Issue Date |
| 8150042 | Method, device, encoder apparatus, decoder apparatus and audio system Techniques are described for combining parametric multi-channel audio coding with matrixing, reconstructing a full-quality multi-channel, independent of the decoder. A stereo signal is obtained from encoding an N-channel audio signal into spatial parameters and a st... | 04/03/2012 |
| 8144879 | Method, device, encoder apparatus, decoder apparatus and audio system A method and a device are described for processing a stereo signal obtained from an encoder, which encodes an N-channel audio signal into spatial parameters (P) and a stereo down-mix comprising first and second stereo signals (LO, RO). A first ... | 03/27/2012 |
| 8116460 | Efficient and scalable parametric stereo coding for low bitrate audio coding applications The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, whic... | 02/14/2012 |
| 8112284 | Methods and apparatus for improving high frequency reconstruction of audio and speech signals The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilizing high frequency reconstruction (HFR). It utilizes a detection mechanism on the encoder side to assess what parts of the spectrum will not be corre... | 02/07/2012 |
| 8081763 | Efficient and scalable parametric stereo coding for low bitrate audio coding applications The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, whic... | 12/20/2011 |
| 8073144 | Stereo balance interpolation The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, whic... | 12/06/2011 |
| 8059826 | Efficient and scalable parametric stereo coding for low bitrate audio coding applications The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, whic... | 11/15/2011 |
| 8054981 | Energy dependent quantization for efficient coding of spatial audio parameters Parameters being a measure for a characteristic of a channel or of a pair of channels, wherein the parameter is a measure for a characteristic of the channel or of the pair of channels with respect to another channel of a multi-channel signal can be quantized more e... | 11/08/2011 |
| 8027479 | Binaural multi-channel decoder in the context of non-energy conserving upmix rules A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer funct... | 09/27/2011 |
| 8019612 | Methods for improving high frequency reconstruction The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilizing high frequency reconstruction (HFR). It utilizes a detection mechanism on the encoder side to assess what parts of the spectrum will not be corre... | 09/13/2011 |
| 8019350 | Audio coding using de-correlated signals A multi-channel signal having at least three channels can be reconstructed such, that the reconstructed channels are at least partly de-correlated from each other using a downmixed signal derived from an original multi-channel signal and a set of de-correlated signa... | 09/13/2011 |
| 8014534 | Efficient and scalable parametric stereo coding for low bitrate audio coding applications The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, whic... | 09/06/2011 |
| 7986789 | Method for representing multi-channel audio signals A multi-channel input signal having at least three original channels is represented by a parameter representation of the multi-channel signal. A first balance parameter, a first coherence parameter, or a first inter-channel time difference between a first channel pa... | 07/26/2011 |
| 7983424 | Envelope shaping of decorrelated signals The envelope of a decorrelated signal derived from an original signal can be shaped without introducing additional distortion, when a spectral flattener is used to spectrally flatten the spectrum of the decorrelated signal and the original signal prior to using the ... | 07/19/2011 |
| 7974847 | Advanced methods for interpolation and parameter signalling A parameter calculator calculates lower resolution parametric information and interpolation information. On a decoder-side, an upmixer is used for generating the output channels. The upmixer uses high resolution parametric information generated by a parameter interp... | 07/05/2011 |
| 7966191 | Method and apparatus for generating a number of output audio channels An audio encoder (109) has a hierarchical encoding structure and generates a data stream comprising one or more audio channels as well as parametric audio encoding data. The encoder (109) comprises an encoding structure processor (305) which ins... | 06/21/2011 |
| 7961890 | Multi-channel hierarchical audio coding with compact side information A parametric representation of a multi-channel audio signal describes the spatial properties of the audio signal well with compact side information when a coherence information, describing the coherence between a first and a second channel, is derived within a hiera... | 06/14/2011 |
| 7936785 | Apparatus for generating and interpreting a data stream modified in accordance with the importance of the data An apparatus for generating a data stream having a series of segments using data organized in subsequent data frames, a data frame having more important and less important data. It comprises a packetiser for packetising data from a data frame into the series of segm... | 05/03/2011 |
| 7917561 | Partially complex modulated filter bank An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises a multiband filter for providing an intermediate rea... | 03/29/2011 |
| 7916873 | Stereo compatible multi-channel audio coding A parametric representation of a multi-channel audio signal having parameters suited to be used together with a monophonic downmix signal to calculate a reconstruction of the multi-channel audio signal can efficiently be derived in a stereo-backwards compatible way ... | 03/29/2011 |
| 7809018 | Apparatus for generating and interpreting a data stream with segments having specified entry points An apparatus for generating a data stream having a series of segments using data organized in subsequent data frames. The apparatus comprises a packetiser for packetising data from a data frame into the series of segments having a first segment and a second segment,... | 10/05/2010 |
| 7720677 | Time warped modified transform coding of audio signals A spectral representation of an audio signal having consecutive audio frames can be derived more efficiently, when a common time warp is estimated for any two neighboring frames, such that a following block transform can additionally use the warp information. Thus, ... | 05/18/2010 |
| 7668722 | Multi parametrisation based multi-channel reconstruction A multi-channel synthesizer for generating at least three output channels using an input signal having at least one base channel, the base channel being derived from the original multi-channel signal, the input signal further including at least two different up-mixi... | 02/23/2010 |
| 7564978 | Advanced processing based on a complex-exponential-modulated filterbank and adaptive time signalling methods A multi-channel decoder is provided for decoding a mono signal and an associated inter-channel coherence measure, the inter-channel coherence measure representing a coherence between a plurality of original channels, the mono signal being derived from the plurality ... | 07/21/2009 |
| 7487097 | Advanced processing based on a complex-exponential-modulated filterbank and adaptive time signalling methods A synthesizer for generating a decorrelation signal using an input signal is operative on a plurality of subband signals, wherein a subband signal includes a sequence of at least two subband samples, the sequence of the subband samples representing a bandwidth of th... | 02/03/2009 |
| 7469206 | Methods for improving high frequency reconstruction The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilizing high frequency reconstruction (HFR). It utilizes a detection mechanism (703a) on the encoder side to assess what parts of the spect... | 12/23/2008 |
| 7433817 | Apparatus and method applying adaptive spectral whitening in a high-frequency reconstruction coding system The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilising high frequency reconstruction (HFR). It utilises adaptive filtering to reduce artifacts due to different tonal characteristics in different frequ... | 10/07/2008 |
| 7382886 | Efficient and scalable parametric stereo coding for low bitrate audio coding applications The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, whic... | 06/03/2008 |
| 7328162 | Source coding enhancement using spectral-band replication The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction (101) prior to or in the encoder (103), followed by spectral-band replication (105) at the decoder ... | 02/05/2008 |
| 7283955 | Source coding enhancement using spectral-band replication The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction (101) prior to or in the encoder (103), followed by spectral-band replication (105) at the decoder ... | 10/16/2007 |
| 7275031 | Apparatus and method for encoding an audio signal and apparatus and method for decoding an encoded audio signal When encoding an audio signal, the audio signal is first encoded with the first encoder to obtain a first encoder output signal. This first encoder output signal is written into a bit stream. It is further decoded by a decoder to provide a decoded audio signal. The ... | 09/25/2007 |
| 7260520 | Enhancing source coding systems by adaptive transposition The present invention relates to a new method for enhancement of source coding systems using high-frequency reconstruction. The invention teaches that tonal signals can be classified as either pulse-train-like or non-pulse-train-like. Relying on this classification,... | 08/21/2007 |
| 7242710 | Aliasing reduction using complex-exponential modulated filterbanks The present invention proposes a new method and apparatus for the improvement of digital filterbanks, by a complex extension of cosine modulated digital filterbanks. The invention employs complex-exponential modulation of a low-pass prototype filter and a new method... | 07/10/2007 |
| 7191121 | Efficient spectral envelope coding using variable time/frequency resolution and time/frequency switching The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope representation, and further, encode the spectral envelope data efficiently... | 03/13/2007 |
| 7050972 | Enhancing the performance of coding systems that use high frequency reconstruction methods An apparatus for encoding an audio signal to obtain an encoded audio signal to be used by a decoder having a high frequency reconstruction module for performing a high frequency reconstruction for a frequency range above a crossover frequency includes, a core encode... | 05/23/2006 |
| 7003451 | Apparatus and method applying adaptive spectral whitening in a high-frequency reconstruction coding system The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilizing high frequency reconstruction (HFR). It utilizes adaptive filtering to reduce artifacts due to different tonal characteristics in different frequ... | 02/21/2006 |
| 6978236 | Efficient spectral envelope coding using variable time/frequency resolution and time/frequency switching The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope representation, and further, encode the spectral envelope data efficiently... | 12/20/2005 |
| 6925116 | Source coding enhancement using spectral-band replication The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction (101) prior to or in the encoder (103), followed by spectral-band replication (105) at the decoder ... | 08/02/2005 |
| 6708145 | Enhancing perceptual performance of sbr and related hfr coding methods by adaptive noise-floor addition and noise substitution limiting Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods a... | 03/16/2004 |
| 6680972 | Source coding enhancement using spectral-band replication The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction 101 prior to or in the encoder 103, followed by spectral-band replication 105 at the decoder 107. This is acc... | 01/20/2004 |
