Audio processor for extended the audio bandwidth of band-limited audio signal

The audio processor (10) for extended a band-limited audio signal, comprising:an envelope determiner (12) for determining a temporal envelope (TDE) from a linear prediction residual of the band-limited audio signal (AS) or an excitation modelling the linear prediction residual of the band-limited audio signal (AS);an analyzer (14) for analyzing the temporal envelope (TDE) to determine certain values (V) of the temporal envelope (TDE);an excitation generator (16) for generating an excitation (E), by placing pulses in relation to the determined certain values (V), wherein the pulses are weighted using weights derived from the temporal envelope (TDE);an extended band generator (18) generating an extended-band audio signal (EBAS) by processing the generated excitation (E);a combiner (20) combining the band-limited audio signal (AS) with the generated extended-band audio signal (EBAS) to obtain a frequency enhanced audio signal (FEAS).