FIELD: data processing.
SUBSTANCE: invention relates to means of determining characteristic relating to artificial limitation of audio signal frequency band. An audio signal spectrum slope is evaluated to obtain an inclination estimate result. Providing information indicating that the audio signal has a predetermined characteristic, depending on the estimate of the inclination estimate. Providing information indicating that the audio signal has a predetermined characteristic, by providing corresponding information indicating a frame result for a plurality of audio signal frames for each of the plurality of frames, and obtaining a plurality of results based on the plurality of frames, and combining a plurality of results to obtain a combined result suitable for a plurality of frames. Median filtration is performed using a plurality of results to obtain a combined result.
EFFECT: technical result consists in providing detection of audio signal processing, which could introduce artifacts into audio signal, as well as reduction of such artefacts.
17 cl, 33 dwg
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