Processor For Generating A Prediction Spectrum Based On Long Term Prediction And/Or Harmonic Post Filtering

Abstract: A processor for processing an (encoded) audio signal, the processor comprising: an LTP buffer configured to receive samples derived from a frame of the encoded audio signal; an interval splitter configured to divide a time interval associated with a subsequent frame of the encoded audio signal into sub-intervals depending on the encoded pitch parameter; calculation means configured to derive sub-interval parameters from the encoded pitch parameter dependent on a position of the sub-intervals within the time interval associated with the subsequent frame of the encoded audio signal; a predictor configured for generating a prediction signal from the LTP buffer dependent on the sub-interval parameters; and a frequency domain transformer configured for generating a prediction spectrum (XP) based on the prediction signal; and/or the processor comprising: a splitter configured for splitting a time interval associated with a frame of the audio signal into a plurality of sub-intervals, each having a respective length, the respective length of the plurality of sub-intervals being dependent on a pitch lag value; a harmonic post-filter configured for filtering the plurality of sub-intervals, wherein the harmonic post-filter is based on a transfer function comprising a numerator and a denominator, where the numerator comprises a harmonicity value, and wherein the denominator comprises a pitch lag value and the harmonicity value and/or a gain value.

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