Patent ID: 8996362
Filing Date: 2015-03-31
Classification: G10L

Abstract:
1. A device for a bandwidth extension of an audio signal, comprising: a signal spreader for generating a version of the audio signal as a time signal spread in time by a spread factor of 2 to obtain a first spread signal that has a doubled time-length of the audio signal and the same sampling rate; a second signal spreader implemented to spread the audio signal by a factor of 3 to obtain a second spread signal that has a tripled time-length of the audio signal and the same sampling rate; a first decimator for decimating the first spread signal by a decimation factor of 2 to obtain a first decimated audio signal that has the same time-length of the audio signal and a doubled sampling rate; a second decimator implemented to decimate the second spread signal by a decimation factor of 3 to obtain a second decimated audio signal that has the same time-length of the audio signal and a tripled sampling rate; a filter for extracting a first extracted signal from the first decimated audio signal, wherein the first extracted signal comprises a frequency range which is not comprised in the audio signal wherein a distortion is applied so that the first extracted signal, the first decimated signal, or a combination signal obtained by a combiner comprises a predetermined envelope; a bandpass filter implemented to extract a second extracted signal having a band from the second decimated audio signal, wherein the second extracted signal contains a frequency range which is not contained in the audio signal; and a combiner for adding the first and second extracted signals or distorted extracted signals and the audio signal to achieve the combination signal extended in its bandwidth by a factor of 2 and a factor of 3 wherein at least one of the first signal spreader, the second signal spreader, the first decimator, the second decimator, the filter, the bandpass filter and the combiner comprises a hardware implementation.