METHOD FOR EXTENDING THE WIDTH OF THE STRIP, DEVICE FOR EXTENDING THE WIDTH OF THE STRIP, THE PROGRAM, THE INTEGRATED DIAGRAM AND THE AUDIO DECODING DEVICE

摘要

1. A method of expanding a bandwidth for generating a full bandwidth signal from a lowband signal, said method comprising: a first conversion step of converting a lowband signal into a comb region of quadrature mirror filters (QMF) to form a first low-pass filter QMF spectrum; pitch shift stage where signals with shifted pitch are generated by applying different shift factors to the low-frequency bandwidth signal; shaping step anija high frequency, generating a high frequency QMF-range by stretching time-shifted signals with a fundamental tone in the QMF-region; phase modification of the spectrum, which is modified QMF-high frequency range to satisfy the conditions of high frequency power and tonality; a step of generating a full bandwidth at which a signal of a full bandwidth is generated by combining the modified high-frequency QMF spectrum with the first low-frequency QMF spectrum. 2. The method of expanding the bandwidth of claim 1, wherein said step of generating high frequencies includes: a second conversion step in which signals with a shifted pitch are converted to a QMF region to form QMF spectra; a step of generating harmonics overlay in which stretch the QMF spectra along a time measurement with different stretch factors to form harmonics; the alignment step, which combines the harmonics on time; phase of summation, in which the harmonics superimposed in time are summed. 3. Sposo