Patent
Audio encoder, audio decoder and audio processor having a dynamically variable warping characteristic
Juergen Herre,Bernhard Grill,Markus Multrus,Stefan Bayer,Ulrich Kraemer,Jens Hirschfeld,Stefan Wabnik,Gerald Schuller +7 more
TLDR
In this article, a controller is connected for providing the time-varying control signal, which depends on the audio signal, and the controller is introduced to an encoding processor having different encoding algorithms adapted to a specific signal pattern.Abstract:
An audio encoder, an audio decoder or an audio processor includes a filter for generating a filtered audio signal, the filter having a variable warping characteristic, the characteristic being controllable in response to a time-varying control signal, the control signal indicating a small or no warping characteristic or a comparatively high warping characteristic. Furthermore, a controller is connected for providing the time-varying control signal, which depends on the audio signal. The filtered audio signal can be introduced to an encoding processor having different encoding algorithms, one of which is a coding algorithm adapted to a specific signal pattern. Alternatively, the filter is a post-filter receiving a decoded audio signal.read more
Citations
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Patent
Method and apparatus of increasing speech intelligibility in noisy environments
Jianming J. Song,John C. Johnson +1 more
TL;DR: In this paper, a method for enhancing the intelligibility of speech emitted into a noisy environment was proposed, where a set of high pass filter gains were combined with the formant enhancement gain factors yielding combined gains which were clipped (518), scaled (520) according to a total SNR, normalized (526), smoothed across time (530), and frequency (532) and used to reconstruct an audio signal.
Patent
Low bitrate audio encoding/decoding scheme having cascaded switches
Bernhard Grill,Roch Lefebvre,Bessette Bruno,Jimmy Lapierre,Philippe Gournay,Redwan Salami,Stefan Bayer,Guillaume Fuchs,Geyersberger Stefan,Geiger Ralf,Hilpert Johannes,Kraemer Ulrich,Jeremie Lecomte,Markus Multrus,Max Neuendorf,Harald Popp,Nikolaus Rettelbach +16 more
TL;DR: In this paper, an audio encoder comprises a first information sink oriented encoding branch such as a spectral domain encoding branch, a second information source or SNR oriented encoder such as an LPC-domain decoding branch, and a switch for switching between the first encoding branch and the second encoding branch.
Patent
Time warp activation signal provider, audio signal encoder, method for providing a time warp activation signal, method for encoding an audio signal and computer programs
Bayer Stefan,Sascha Disch,Geiger Ralf,Guillaume Fuchs,Max Neuendorf,Gerald Schuller,Bernd Edler +6 more
TL;DR: An audio encoder has a window function controller, a windower, a time warper with a final quality check functionality, an audio decoder applies a noise filling operation using a manipulated noise filling estimate depending on a harmonic or speech characteristic of the audio signal.
Patent
Multi-mode audio signal decoder, multi-mode audio signal encoder, methods and computer program using a linear-prediction-coding based noise shaping
Max Neuendorf,Guillaume Fuchs,Nikolaus Rettelbach,Tom Baeckstroem,Jeremie Lecomte,Herre Juergen +5 more
TL;DR: In this paper, a multi-mode audio signal decoder for providing a decoded representation of an audio content on the basis of an encoded representation of the audio content comprises a spectral value determinator configured to obtain sets of decoded spectral coefficients for a plurality of portions of audio content.
Patent
Audio encoder and decoder for encoding frames of sampled audio signals
TL;DR: In this article, an audio encoder is adapted for encoding frames of a sampled audio signal to obtain encoded frames, wherein a frame comprises a number of time domain audio samples, comprising a predictive coding analysis stage (110) for determining information on coefficients of a synthesis filter and information on a prediction domain frame based on a frame of audio samples.
References
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Psychoacoustics: Facts and Models
Hugo Fastl,Eberhard Zwicker +1 more
TL;DR: This description of the processing of sound by the human hearing system presents the quantitative relationship between sound stimuli and auditory perceptions in terms of hearing sensations, and implements these relationships in model form.
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Bark and ERB bilinear transforms
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TL;DR: A closed-form weighted-equation-error method is derived that computes the optimal mapping coefficient as a function of sampling rate, and the solution is shown to be generally indistinguishable from the optimal least-squares solution.
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Digital Speech Transmission: Enhancement, Coding and Error Concealment
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TL;DR: This chapter discusses models of Speech Production and Hearing, performance of the Auditory Organs, and statistical properties of Speech Signals in the DFT Domain.
PatentDOI
Methods and devices for low-frequency emphasis during audio compression based on acelp/tcx
TL;DR: In this paper, a method for low-frequency emphasizing the spectrum of a sound signal transformed in a frequency domain and comprising transform coefficients grouped in a number of blocks, in which a maximum energy for one block is calculated and a position index of the block with maximum energy is determined, a factor is calculated for each block having a position Index smaller than the position Index of the Block with maximum Energy, and for each blocks a gain is determined from the factor and is applied to the transform coefficients of the blocks.
Journal Article
Frequency-warped signal processing for audio applications
TL;DR: A methodology, frequency-warped digital signal processing, is presented in a tutorial paper as a means to design or implement digital signal-processing algorithms directly in a way that is relevant for auditory perception.