Patent ID: 8924200

Claim:
A method for decoding a signal in an audio decoder having a CELP-based decoder element that includes a fixed codebook component, at least one pitch period value, and a first decoder output, an audio bandwidth of the signal extends beyond an audio bandwidth of the CELP-based decoder element, the method comprising: obtaining an up-sampled fixed codebook signal by up-sampling the fixed codebook component to a higher sample rate; obtaining an up-sampled excitation signal based on the up-sampled fixed codebook signal and an integer up-sampled pitch period value; obtaining a composite output signal based on the up-sampled excitation signal and an output signal of the CELP-based decoder element; and deriving the integer up-sampled pitch period value by multiplying the fractional pitch period of the CELP-based decoder element by an up-sampling factor, adding accumulated error from previous integer roundings, and rounding the result, wherein the composite output signal includes an audio bandwidth portion that extends beyond an audio bandwidth of the CELP-based decoder element.