France Telecom

Orange

Abdellatif Benjelloun Touimi

Adil Mouhssine

David Virette

Claude Lamblin

Pierre Duhamel

Aurélien Sollaud

The invention concerns data processing by passage between different subband domains, of a first number L to a second number M of subband components. After determining a third number K, least common multiple between the first number L and the second number M: a) if K is different from L, it consists in arranging in blocs, by a serial/parallel conversion, an input vector X(z) to, obtain ppolyphase component vectors (p2=KL); b) applying a square matrix filtering T(z) of dimensions K&#xd7;K, to the ppolyphase component vectors to obtain ppolyphase component vectors for forming an output vector Y(z), with p=K/M, and if the third number K is different from the second number M, providing a block arrangement by a parallel/serial conversion to obtain the output vector Y(z).

Data processing method by passage between different sub-band domains

The invention relates to a method for quantifying components, wherein certain components are each determined based on a plurality of audio signals and can be calculated by the application of a linear conversion on the audio signals, said method comprising: determining a quantification function to be applied to the components by testing a condition relative to an audio signal and depending on a comparison made between a psycho-acoustic masking threshold relative to the audio signal and a value determined based on the reverse linear conversion and quantification errors of the components by the function.

Quantization after linear transformation combining the audio signals of a sound scene, and related coder

The invention relates to a method for sequencing spectral components of elements to be encoded (A, . . . , A) originating from an audio scene comprising N signals (Si), in which N&#x3e;1, an element to be encoded comprising spectral components associated with respective spectral bands, characterised in that it comprises the following steps: calculation of the respective influence of at least some spectral components which can be calculated as a function of the spectral parameters originating from at least some of the N signals on the mask-to-noise ratios determined over the spectral bands as a function of the encoding of said spectral components; and allocation of an order of priority to at least one spectral component as a function of the influence calculated for said spectral component compared to the other influences calculated.

Audio encoding and decoding method and associated audio encoder, audio decoder and computer programs

The invention relates to a method for ordering spectral parameters of ambisonic components to be encoded (A, . . . , A) originating from an audio scene comprising N signals (Si=), in which N&#x3e;1, comprising the following steps: calculation of the respective influence of at least some spectral parameters, taken from a set of spectral parameters to be ordered, on an angle vector defined as a function of energy and velocity vectors associated with Gerzon's criteria and calculated as a function of a reverse ambisonic transformation in relation to said quantified ambisonic components; and allocation of a precedence order to at least one spectral parameter as a function of the influence calculated for said spectral parameter compared to the other calculated influences.

The invention relates to the compression coding of digital signals such as multimedia signals (audio or video), and more particularly a method for multiple coding, wherein several encoders each comprising a series of functional blocks receive an input signal in parallel. Accordingly, a method is provided in which, a) the functional blocks forming each encoder are identified, along with one or several functions carried out of each block, b) functions which are common to various encoders are itemized and c) said common functions are carried out definitively for a part of at least all of the encoders within at least one same calculation module.

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Lannion, France

Abdellatif Benjelloun Touimi