Patent ID: 8595019

Claim:
An audio encoding apparatus adapted for encoding frames of a sampled audio signal to obtain encoded frames, wherein a frame comprises a number of time domain audio samples, comprising: a predictive coding analysis stage for determining information on coefficients of a synthesis filter and a prediction domain frame based on a frame of audio samples; a time-aliasing introducing transformer for transforming overlapping prediction domain frames to a frequency domain to obtain prediction domain frame spectra, wherein the time-aliasing introducing transformer is adapted for transforming the overlapping prediction domain frames in a critically-sampled way; and a redundancy reducing encoder for encoding the prediction domain frame spectra to obtain the encoded frames based on the coefficients and encoded prediction domain frame spectra, a codebook encoder for encoding the prediction domain frames based on a predetermined codebook to obtain a codebook encoded prediction domain frame; and a decider for deciding whether to use a codebook encoded prediction domain frame or an encoded prediction domain frame to obtain a finally encoded frame based on a coding efficiency measure. wherein at least one of the predictive coding analysis stage, the time-aliasing introducing transformer, the redundancy reducing encoder, the codebook encoder, and the decider comprises a hardware implementation.