Audio signal processor and related methods and computer programs for generating a two-channel audio signal using a specific integral of a noise sequence.

Abstract

An audio signal processor for generating a 2-channel audio signal, comprising: an input interface (100) for providing single-channel acoustic data describing an acoustic environment; a 2-channel synthesizer (200) for synthesizing 2-channel acoustic data from single-channel acoustic data using listener position or rotation; and a sound generator (300) for generating a 2-channel audio signal from an audio signal and 2-channel acoustic data, wherein the 2-channel synthesizer (200) separates the single-channel acoustic data into at least two parts (210) consisting of a direct sound portion and at least one of an early reflection portion and a late reverberation portion, and generates 2-channel acoustic data for each part Audio signal processor configured to process at least two parts individually to generate (220, 230, 240), wherein a two-channel combiner (200) is configured to use the amplitude spectrum of the early reflection portion or single-channel acoustic data without the direct tone portion or late reverberation portion and a first channel noise phase spectrum to obtain the first channel of the two-channel acoustic data, and to use the amplitude spectrum of the early reflection portion or single-channel acoustic data without the direct tone portion or late reverberation portion and a second channel noise phase spectrum to calculate the two-channel diffuse portion of the early reflection portion or single-channel acoustic data without the direct tone portion or late reverberation portion.

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