APPARATUS AND METHOD FOR CALCULATING BANDWIDTH EXTENSION DATA USING A SPECTRAL TILT CONTROLLED FRAMING Russian patent published in 2012 - IPC G10L21/02 H04B1/69 

FIELD: acoustics.

SUBSTANCE: first spectral band is encoded with a first number of bits and a second spectral band different from the first spectral band is encoded with a second number of bits, the second number of bits being smaller than the first number of bits. The apparatus has a controllable bandwidth extension parameter calculator (10) for calculating bandwidth extension parameters for the second frequency band in a frame-wise manner for a sequence of frames of the audio signal. Each frame has a controllable start time instant. The apparatus additionally includes a spectral tilt detector (12) for detecting a spectral tilt in a time portion of the audio signal and for signaling the start time instant for the individual frames of the audio signal depending on spectral tilt.

EFFECT: enhanced audio signal quality in the extended range.

19 cl, 8 dwg