Patent ID: 9368121
Filing Date: 2016-06-14
CPC Classification: G10L

Claim Text:
1. A method comprising: receiving a digital audio signal or input quantization indices through an input module; coding the digital audio signal to produce output quantization indices or decoding the input quantization indices to produce a decoded digital audio signal with a processor, the coding or decoding comprising a transform coding or decoding using at least one of analysis or synthesis weighting windows applied to sample frames and obtained from an irregular sampling of an initial window provided for a transform of given initial size N, to apply a secondary transform of size M different from N, including storing the initial window in a non-transitory computer-readable memory cooperating with the processor, wherein sampling comprises selecting, from a first coefficient d of the initial window that is stored in the memory, with 0≦d<N/M, a defined set of coefficients N−d−1, N+d, 2N−d−1, observing a predetermined perfect reconstruction condition; and transmitting through an output module the output quantization indices or providing the decoded digital audio signal.