Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Yoshikazu Yokotani

Juergen Herre

Nikolaus Rettelbach

Ralf Geiger

Max Neuendorf

Stefan Geyersberger

Guillaume Fuchs

Christian Helmrich

Frederik Nagel

Stefan Bayer

Manuel Jander

Benjamin Schubert

Stefan Wabnik

Jens Hirschfeld

Sascha Disch

Markus Multrus

Bernhard Grill

Johannes Hilpert

Gerald Schuller

Jürgen Herre

Harald Popp

Ulrich Kraemer

An apparatus for decoding data segments representing a time-domain data stream, a data segment being encoded in the time domain or in the frequency domain, a data segment being encoded in the frequency domain having successive blocks of data representing successive and overlapping blocks of time-domain data samples. The apparatus includes a time-domain decoder for decoding a data segment being encoded in the time domain and a processor for processing the data segment being encoded in the frequency domain and output data of the time-domain decoder to obtain overlapping time-domain data blocks. The apparatus further includes an overlap/add-combiner for combining the overlapping time-domain data blocks to obtain a decoded data segment of the time-domain data stream.

Encoder, decoder and methods for encoding and decoding data segments representing a time-domain data stream

An audio decoder provides a decoded audio information on the basis of an encoded audio information including linear prediction coefficients (LPC) and includes a tilt adjuster to adjust a tilt of a noise using linear prediction coefficients of a current frame to acquire a tilt information and a noise inserter configured to add the noise to the current frame in dependence on the tilt information. Another audio decoder includes a noise level estimator to estimate a noise level for a current frame using a linear prediction coefficient of at least one previous frame to acquire a noise level information; and a noise inserter to add a noise to the current frame in dependence on the noise level information provided by the noise level estimator. Thus, side information about a background noise in the bit-stream may be omitted. Methods and computer programs serve a similar purpose.

Noise filling without side information for CELP-like coders

Decoding data segments representing a time-domain data stream

An audio encoder has a common preprocessing stage, an information sink based encoding branch such as spectral domain encoding branch, a information source based encoding branch such as an LPC-domain encoding branch and a switch for switching between these branches at inputs into these branches or outputs of these branches controlled by a decision stage. An audio decoder has a spectral domain decoding branch, an LPC-domain decoding branch, one or more switches for switching between the branches and a common post-processing stage for post-processing a time-domain audio signal for obtaining a post-processed audio signal.

Low bitrate audio encoding/decoding scheme with common preprocessing

For classifying different segments of a signal which has segments of at least a first type and second type, e.g. audio and speech segments, the signal is short-term classified on the basis of the at least one short-term feature extracted from the signal and a short-term classification result is delivered. The signal is also long-term classified on the basis of the at least one short-term feature and at least one long-term feature extracted from the signal and a long-term classification result is delivered. The short-term classification result and the long-term classification result are combined to provide an output signal indicating whether a segment of the signal is of the first type or of the second type.

Method and discriminator for classifying different segments of a signal

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Shizuoka, Japan

Yoshikazu Yokotani