Alcatel

Intel Corporation

Siemens Aktiengesellschaft

Robert Boschgmbh

Huawei Technologies Co., Limited

Telefonaktiebolaget Lm Ericsson (publ)

Intel Mobile Communications Gmbh

Siemens Audiologische Technik Gmbh

Siemens Enterprise Communications Gmbh & Co. Kg

Detecon Deutsche Telepost Consulting Gmbh

Unify Gmbh Co. Kg

Peter Vary

Bernd Geiser

Peter Jax

Stefan Schandl

Christophe Beaugeant

Herve Taddei

Hauke Krüger

Christoph Nelke

Stefan Heinen

Martin Gartner

Navin Chatlani

Werner Schmidt

Tim Fingscheidt

Marco Jeub

Wolfgang Papen

Christian Herglotz

Stefan Zurbes

Frank Mertz

Aulis Telle

Stefan Bleck

An audio processing device is described comprising an energy distribution determiner configured to determine an energy distribution of a sound and an acoustical environment determiner configured to determine based on the energy distribution whether the sound includes a sound caused by the acoustical environment.

Audio processing devices and audio processing methods

A method, system, and computer program product for managing noise in a noise reduction system, comprising: receiving a first signal at a first microphone; receiving a second signal at a second microphone; identifying noise estimation in the first signal and the second signal; identifying a transfer function of the noise reduction system using a ratio of a power spectral density of the second signal minus the noise estimation to a power spectral density of the first signal, wherein the noise estimation is removed from only the power spectral density of the second signal; and identifying a gain of the noise reduction system using the transfer function.

Noise reduction for dual-microphone communication devices

To form an audio signal, frequency components of the audio signal which are allotted to a first subband are formed by means of a subband decoder using supplied fundamental period values which respectively indicate a fundamental period for the audio signal. Frequency components of the audio signal which are allotted to a second subband are formed by exciting an audio synthesis filter using an excitation signal which is specific to the second subband. To produce this excitation signal, an excitation signal generator derives a fundamental period parameter from the fundamental period values. The fundamental period parameter is used by the excitation signal generator to form pulses with a pulse shape which is dependent on the fundamental period parameter at an interval of time which is determined by the fundamental period parameter and to mix them with a noise signal.

Method and arrangements for audio signal encoding

The invention relates to a method for outputting a speech signal. Speech signal frames are received and are used in a predetermined sequence in order to produce a speech signal to be output. If one speech signal frame to be received is not received, then a substitute speech signal frame is used in its place, which is produced as a function of a previously received speech signal frame. According to the invention, in the situation in which the previously received speech signal frame has a voiceless speech signal, the substitute speech signal frame is produced by means of a noise signal.

Method for error concealment in the transmission of speech data with errors

In a method for embedding steganographic information into the signal information of a signal encoder, a solution is to be created, which enables steganographic information being embedded into the signal information of a signal encoder such that a reduction of the voice quality is largely avoided. This is achieved by means of providing data information, particularly voice information, selecting steganographic information from a quantity of steganographic information, generating a code word from a code book provided by means of the signal encoder on the basis of the code elements forming the code book such that with the use of the code word generated within the scope of a transmission standard associated with the code book the data information is encoded into signal information containing the code word and/or making reference to the code word; and by the code word generated having an additional feature that can be calculated on the basis of the code elements forming the code word, wherein the additional feature represents the steganographic information.

Steganography in digital signal encoders

The invention pertains to a method and apparatus of efficient encoding and decoding of vector quantized data. The method and system explores and implements sub-division of a quantization vector space comprising class-leader vectors and representation of the class-leader vectors by a set of class-leader root-vectors facilitating faster encoding and decoding, and reduced storage requirements.

Method and apparatus of communication

A method for the artificial extension of the bandwidth of speech signals involves:

Method and device for the artificial extension of the bandwidth of speech signals

A wideband audio coding concept is presented that provides good audio quality at bit rates below 3 bits per sample with an algorithmic delay of less than 10 ms. The concept is based on the principle of Linear Predictive Coding (LPC) in an analysis-by-synthesis framework. A spherical codebook is used for quantisation at bit rates which are higher in comparison to low bit rate speech coding for improved performance for audio signals. For superior audio quality, noise shaping is employed to mask the coding noise. In order to reduce the computational complexity of the encoder, the analysis-by synthesis framework has been adapted for the spherical codebook to enable a very efficient excitation vector search procedure. Furthermore, auxiliary information gathered in advance is employed to reduce a computational encoding and decoding complexity at run time significantly. This auxiliary information can be considered as the SCELP codebook. Due to the consideration of the characteristics of the apple-peeling-code construction principle, this codebook can be stored very efficiently in a read-only-memory.

Method and device for coding audio data based on vector quantisation

A method of encoding a signal, particularly a message signal for speech and/or image transmission, in which signal-matched encoding of the signal with M bits is performed using Q quantization levels, with Q<2 , and in which at least part of the remaining bit rate or the entire redundancy of M&minus;Id(Q) bits is used to protect the signal against errors. The error protection uses a nonlinear code, for example. Furthermore, additional, signal-matched code redundancy can be added to an arbitrary source-coded signal. To decode the redundant signals in both cases, parameter estimation is performed at the receiving end using at least part of the redundancy.

Method of encoding a signal

With a method and a device for error masking in digital transmission systems whereby a distribution function for estimating transmitted parameters is determined at the receiving end, the method provides that a distribution function is adjusted around the output signal value of a predictor and is integrated by sections into a new distribution function; this new distribution function is multiplied by a distribution function which takes the received quality into consideration and the result of an a posteriori distribution which can be used with conventional estimation methods for the final parameter estimation.

Method and device for error masking in digital transmission systems

Cell control system for cellular, digital mobile communication system

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Aachen, Germany

Peter Vary