Patent application number | Description | Published |
20110282656 | Method And Arrangement For Processing Of Audio Signals - Method and decoder for processing of audio signals. The method and decoder relate to deriving a processed vector {circumflex over (d)} by applying a post-filter directly on a vector d comprising quantized MDCT domain coefficients of a time segment of an audio signal. The post-filter is configured to have a transfer function H which is a compressed version of the envelope of the vector d. A signal waveform is reconstructed by performing an inverse MDCT transform on the processed vector {circumflex over (d)}. | 11-17-2011 |
20120221326 | Methods and Arrangements for Loudness and Sharpness Compensation in Audio Codecs - In a method of improving perceived loudness and sharpness of a reconstructed speech signal delimited by a predetermined bandwidth, performing the steps of providing (S | 08-30-2012 |
20120230515 | BANDWIDTH EXTENSION OF A LOW BAND AUDIO SIGNAL - Estimation of a high band extension of a low band audio signal includes the following steps: extracting (S | 09-13-2012 |
20120239388 | EXCITATION SIGNAL BANDWIDTH EXTENSION - An apparatus for generating a high band extension of a low band excitation signal (e | 09-20-2012 |
20130006646 | Transform Audio Codec and Methods for Encoding and Decoding a Time Segment of an Audio Signal - Methods and devices for efficient encoding/decoding of a time segment of an audio signal. Methods comprise deriving an indicator, z, of the position in a frequency scale of a residual vector associated with the time segment of the audio signal, and deriving a measure, Φ, related to the amount of structure of the residual vector. The methods further comprise determining whether a predefined criterion involving the measure Φ, the indicator z and a predefined threshold Θ, is fulfilled, which corresponds to estimating whether a change of sign of at least some of the non-zero coefficients of the residual vector would be audible after reconstruction of the audio signal time segment. The amplitude of the coefficients of the residual vector is encoded, and the signs of the coefficients of the residual vector are encoded only when it is determined that the criterion is fulfilled, and thus that a change of sign would be audible. | 01-03-2013 |
20130317811 | Efficient Encoding/Decoding of Audio Signals - A method for encoding of an audio signal comprises performing ( | 11-28-2013 |
20130346087 | Filling of Non-Coded Sub-Vectors in Transform Coded Audio Signals - A spectrum filler for filling non-coded residual sub-vectors of a transform coded audio signal includes a sub-vector compressor ( | 12-26-2013 |
20140114667 | Transform Audio Codec and Methods for Encoding and Decoding a Time Segment of an Audio Signal - Methods and devices for efficient encoding/decoding of a time segment of an audio signal. The methods comprise deriving an indicator, z, of the position in a frequency scale of a residual vector associated with the time segment of the audio signal, and deriving a measure, Φ, related to the amount of structure of the residual vector. The methods further comprise determining whether a predefined criterion involving the measure Φ, the indicator z and a predefined threshold Θ, is fulfilled, which corresponds to estimating whether a change of sign of at least some of the non-zero coefficients of the residual vector would be audible after reconstruction of the audio signal time segment. The respective amplitude of the coefficients of the residual vector is encoded, and the signs of the coefficients of the residual vector are encoded only when it is determined that the criterion is fulfilled, and thus that a change of sign would be audible. | 04-24-2014 |
20140249828 | Audio Encoding/Decoding based on an Efficient Representation of Auto-Regressive Coefficients - Described is an encoder ( | 09-04-2014 |
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 |