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Hamburg Innovation Gmbh

Helmut-schmidt-universitat-universitat Der Bundeswehr Hamburg

Helmut-schmidt-universität

Martin Mieth

Udo Zölzer

Marco Fink

Sebastian Kraft

A method for analysing and decomposing a stereo audio signal including an audio signal for a left reproduction device and an audio signal for a right reproduction device by extracting panning coefficients that contain direction information about the sound sources from which the stereo audio signal originates based on the approximation that one sound source can be regarded as dominant for each frequency. This approximation allows the panning coefficients to be obtained, by solving a system of equations, with lower computation complexity than in the prior art. The sound quality that is obtained after re-panning the signal enhanced in this manner for a configuration with more than two loudspeakers is constant or better. Advantageously, following determination of the panning coefficients, the direct signal and two ambient signals that are not correlated with the direct sound source are extracted from the stereo audio signal.

Method for analysing and decomposing stereo audio signals

The invention relates to a method for generating a multichannel audio signal () from a stereo audio signal (), having the following steps: ascertaining a first panning coefficient () and a second panning coefficient () of the stereo audio signal; ascertaining a direct signal () as well as a first surroundings signal () and a second surroundings signal () from the first audio signal and the second audio signal and from the first panning coefficient and the second panning coefficient; ascertaining a plurality of repanning coefficients () from the panning coefficients, each repanning coefficient of the plurality of repanning coefficients being assigned to an audio channel () of a plurality of audio channels of the multichannel audio signal; calculating each direct signal using each of the repanning coefficients of the plurality of repanning coefficients; and converting each audio channel into a playback signal () of the multichannel audio signal, each playback signal being provided for a respective playback device.

Producing a multichannel sound from stereo audio signals

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Leipzig, Germany

Martin Mieth