Patent ID: 8804970

Claim:
Audio encoder for generating an encoded audio signal, comprising: a first encoding branch for encoding an audio intermediate signal in accordance with a first coding algorithm, the first coding algorithm comprising an information sink model and generating, in a first encoding branch output signal, encoded spectral information representing the audio intermediate signal, the first encoding branch comprising a spectral conversion block for converting the audio intermediate signal into a spectral domain and a spectral audio encoder for encoding an output signal of the spectral conversion block to acquire the encoded spectral information; a second encoding branch for encoding an audio intermediate signal in accordance with a second coding algorithm, the second coding algorithm comprising an information source model and generating, in a second encoding branch output signal, encoded parameters for the information source model representing the audio intermediate signal, the second encoding branch comprising an LPC analyzer for analyzing the audio intermediate signal and for outputting an LPC information signal usable for controlling an LPC synthesis filter and an excitation signal, and an excitation encoder for encoding the excitation signal to acquire the encoded parameters; and a common pre-processing stage for pre-processing an audio input signal to acquire the audio intermediate signal, wherein the common pre-processing stage is operative to process the audio input signal so that the audio intermediate signal is a compressed version of the audio input signal.