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Vasu Iyengar, Rafi Rabipour, Paul Mermelstein, Brian R Shelton: Speech bandwidth extension method and apparatus. Northern Telecom, Dallas F Smith, John A Granchelli, October 3, 1995: US05455888 (184 worldwide citation)

A speech bandwidth extension method and apparatus analyzes narrowband speech sampled at 8 kHz using LPC analysis to determine its spectral shape and inverse filtering to extract its excitation signal. The excitation signal is interpolated to a sampling rate of 16 kHz and analyzed for pitch control a ...


2
Lars Villemoes, Per Ekstrand, Sascha Disch, Frederik Nagel, Stephan Wilde: Apparatus and method for processing an input audio signal using cascaded filterbanks. Fraunhofer Gesellschaft zur Foerderung der angewandten Forschung e V, Dolby International, Michael A Glenn, Perkins Coie, October 17, 2017: US09792915 (1 worldwide citation)

An apparatus for processing an input audio signal relies on a cascade of filterbanks, the cascade having a synthesis filterbank for synthesizing an audio intermediate signal from the input audio signal, the input audio signal being represented by a plurality of first subband signals generated by an ...


3
Frederik Nagel, Max Neuendorf, Nikolaus Rettelbach, Jeremie Lecomte, Markus Multrus, Bernhard Grill, Sascha Disch: Apparatus, method and computer program for generating a representation of a bandwidth-extended signal on the basis of an input signal representation using a combination of a harmonic bandwidth-extension and a non-harmonic bandwidth-extension. Fraunhofer Gesellschaft zur Foerderung der angewandten Forschung e V, Perkins Coie, Michael A Glenn, July 4, 2017: US09697838

An apparatus for generating a representation of a bandwidth-extended signal on the basis of an input signal representation includes a phase vocoder configured to obtain values of a spectral domain representation of a first patch of the bandwidth-extended signal on the basis of the input signal repre ...


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APPARATUS, METHOD AND COMPUTER PROGRAM FOR GENERATING A REPRESENTATION OF A BANDWIDTH-EXTENDED SIGNAL ON THE BASIS OF AN INPUT SIGNAL REPRESENTATION USING A COMBINATION OF A HARMONIC BANDWIDTH-EXTENSION AND A NON-HARMONIC BANDWIDTH-EXTENSION. September 21, 2017: US20170270937-A1

An apparatus for generating a representation of a bandwidth-extended signal on the basis of an input signal representation includes a phase vocoder configured to obtain values of a spectral domain representation of a first patch of the bandwidth-extended signal on the basis of the input signal repre ...


5
Apparatus and Method for Generating a Bandwidth Extended Signal from a Bandwidth Limited Audio Signal. September 13, 2018: US20180261229-A1

An apparatus for generating a bandwidth extended signal from a bandwidth limited audio signal, the bandwidth limited audio signal The patch generator is configured to perform a harmonic patching algorithm to obtain the patched signal. The signal manipulator is configured for manipulating a signal be ...


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APPARATUS AND METHOD FOR PROCESSING AN INPUT AUDIO SIGNAL USING CASCADED FILTERBANKS. December 20, 2018: US20180366130-A1

An apparatus for processing an input audio signal relies on a cascade of filterbanks, the cascade having a synthesis filterbank for synthesizing an audio intermediate signal from the input audio signal, the input audio signal being represented by a plurality of first subband signals generated by an ...


7
AUDIO ENCODER AND BANDWIDTH EXTENSION DECODER. May 23, 2019: US20190156845-A1

An audio encoder for providing an output signal using an input audio signal includes a patch generator, a comparator and an output interface. The patch generator generates at least one bandwidth extension high-frequency signal, wherein a bandwidth extension high-frequency signal includes a high-freq ...