Patent application number | Description | Published |
20090172060 | FILTER ADAPTIVE FREQUENCY RESOLUTION - In signal processing using digital filtering the representation of a filter is adapted depending on the filter characteristics. If e.g. a digital filter is represented by filter coefficients for transform bands Nos. 0, 1, . . . , K in the frequency domain, a reduced digital filter having coefficients for combined transform bands, i.e. subsets of the transformed bands, Nos. 0, 1, . . . , L, is formed and only these coefficients are stored. When the actual filtering in the digital filter is to be performed, an actual digital filter is obtained by expanding the coefficients of the reduced digital filter according to a mapping table and then used instead of the original digital filter. | 07-02-2009 |
20100322429 | Joint Enhancement of Multi-Channel Audio - An overall encoding procedure and associated decoding procedure are presented. The encoding procedure involves at least two signal encoding processes operating on signal representations of a set of audio input channels. Local synthesis is used in connection with a first encoding process to generate a locally decoded signal, including a representation of the encoding error of the first encoding process. This locally decoded signal is applied as input to a second encoding process. The overall encoding procedure generates at least two residual encoding error signals from at least one of said encoding processes, including at least said second encoding process. The residual error signals are then subjected to compound residual encoding in a further encoding process, preferably based on correlation between the residual error signals. | 12-23-2010 |
20110224994 | Energy Conservative Multi-Channel Audio Coding - The invention relates to the technical field of audio encoding and/or decoding technologies, and thus concerns an overall encoding procedure and associated decoding procedure. The encoding procedure involves at least two signal encoding processes (S | 09-15-2011 |
20120278085 | METHOD AND A DECODER FOR ATTENUATION OF SIGNAL REGIONS RECONSTRUCTED WITH LOW ACCURACY - The embodiments of the present invention improves conventional attenuation schemes by replacing constant attenuation with an adaptive attenuation scheme that allows more aggressive attenuation, without introducing audible change of signal frequency characteristics. | 11-01-2012 |
20130110506 | Audio Encoder and Decoder and Methods for Encoding and Decoding an Audio Signal | 05-02-2013 |
20130317811 | Efficient Encoding/Decoding of Audio Signals - A method for encoding of an audio signal comprises performing ( | 11-28-2013 |
20130339038 | Post-Quantization Gain Correction in Audio Coding - A gain adjustment apparatus ( | 12-19-2013 |
20140025375 | Adaptive Gain-Shape Rate Sharing - An object of embodiments of the present invention is to provide an improved gain-shape VQ. This is achieved by determining a number of bits to be allocated to a gain adjustment- and shape-quantizer for a plurality of combinations of a current bit rate and a first signal property. The determined allocated number of bits to the gain adjustment- and shape quantizer should provide a better result for the given bitrate and signal property than using a single fixed allocation scheme. That can be achieved by deriving the bit allocation by using an average of optimal bit allocations for a training data set. Thus by pre-calculating a number of bits to the gain adjustment and the shape quantizers for a plurality of combinations of the bit rate and a first signal property and creating a table indicating the number of bits to be allocated to the gain adjustment- and the shape-quantizers for a plurality of combinations of the bit rate and a first signal property. In this way, the table can be used for achieving an improved bit allocation. | 01-23-2014 |
20140081646 | Method and a Decoder for Attenuation of Signal Regions Reconstructed with Low Accuracy - The embodiments of the present invention improves conventional attenuation schemes by replacing constant attenuation with an adaptive attenuation scheme that allows more aggressive attenuation, without introducing audible change of signal frequency characteristics. | 03-20-2014 |
20140257827 | GENERATION OF A HIGH BAND EXTENSION OF A BANDWIDTH EXTENDED AUDIO SIGNAL - An audio decoder configured to generate a high band extension of an audio signal from an envelope and an excitation. The audio decoder includes a control arrangement configured to jointly control envelope shape and excitation noisiness with a common control parameter (f). | 09-11-2014 |
20140288925 | BANDWIDTH EXTENSION OF AUDIO SIGNALS - Audio decoder and method therein for supporting bandwidth extension (BWE) of a received signal. The method involves receiving a first signal representing the lower frequency spectrum of a segment of an original audio signal; receiving a second signal, being a BWE signal, representing a higher frequency spectrum of the segment of the original audio signal. The method further comprises determining a degree of voicing in the lower frequency spectrum of the audio signal, based on the received first signal; and selecting a spectral tilt adaptation filter, out of at least two spectral tilt adaptation filters having different spectral attenuation characteristics, based on the determined degree of voicing. The selected spectral tilt adaptation filter is then applied on the received second signal. Thus, a differentiation of spectral tilt in the higher frequency spectrum of a reconstructed audio signal, based on lower frequency spectrum characteristics of the original audio signal is enabled. | 09-25-2014 |