Emphasis of Low Frequency Coding based on LPC (Linear Prediction Coding) in the frequency domain

摘要

This provides an Audio Encoder and Method for encoding an audio signal voice to produce a stream of bits from the same, in which the Audio Encoder comprises a combination (2):3) a Filter of linear predictive Coding (2) having a Plurality of coefficients of linear predictive Coding (LC) and time - Frequency Converter (3), in which the combination (23) filter, and is configured to convert a Table (FI) of the audio signal (as) in a Frequency Domain in order to issue a Spectrum (SP) based on table (FI) and the coefficients of linear predictive Coding (LC); a Low Frequency Enfatizador (4) Set P To calculate a Spectrum Processing (PS) based on the Spectrum (SP)To emphasize the Spectral Lines (SL) of the processed Spectrum (PS) representing a Frequency lower than a reference Spectral line (RSL); and a control device (5) configured to control the calculation of the Spectrum (PS) for the processing of Low Frequency Enfatizador Gums (4) as a function of the coefficients of linear predictive Coding (LC) filter sApplication of linear Prediction (2). Also, this provides an Audio Decoder, a System, a method for decoding a Bitstream that contains a Plurality of Spectra and quantified coefficients of linear Prediction Coding and corresponding software.