Abstract: An apparatus for encoding an audio input signal to obtain an encoded audio signal is provided. The apparatus comprises a transformation module configured to transform the audio input signal from an original domain to a transform domain to obtain a transformed audio signal. Moreover, the apparatus comprises an encoding module, configured to quantize the transformed audio signal to obtain a quantized signal, and configured to encode the quantized signal to obtain the encoded audio signal. The transformation module is configured to transform the audio input signal depending on a plurality of predefined power values of quantization noise in the original domain.

Abstract: There are provided examples of decoders and decoding methods. One decoder includes: a bitstream reader to provide a version of an input signal as a sequence of frames, each frame subdivided into a plurality of bins, each bin having a sampled value; a context definer to define a context for one bin under process, the context including at least one additional bin in a predetermined positional relationship with the bin under process; a statistical relationship and information estimator to provide statistical relationships between the bin under process and the at least one additional bin; and a value estimator to process and acquire an estimate of the value of the bin. There is included a noise relationship and information estimator providing statistical relationships and information regarding noise, which includes a noise matrix estimating relationships among noise signals among the bin under process and the at least one additional bin.

Abstract: There are provided examples of decoders and decoding methods. One decoder includes: a bitstream reader to provide a version of an input signal as a sequence of frames, each frame subdivided into a plurality of bins, each bin having a sampled value; a context definer to define a context for one bin under process, the context including at least one additional bin in a predetermined positional relationship with the bin under process; a statistical relationship and information estimator to provide statistical relationships between the bin under process and the at least one additional bin; and a value estimator to process and acquire an estimate of the value of the bin. There is included a noise relationship and information estimator providing statistical relationships and information regarding noise, which includes a noise matrix estimating relationships among noise signals among the bin under process and the at least one additional bin.

Abstract: It is shown an encoder for encoding an audio signal with reduced background noise using linear predictive coding. The encoder includes a background noise estimator configured to estimate background noise of the audio signal, a background noise reducer configured to generate background noise reduced audio signal by subtracting the estimated background noise of the audio signal from the audio signal, and a predictor configured to subject the audio signal to linear prediction analysis to obtain a first set of linear prediction filter (LPC) coefficients and to subject the background noise reduced audio signal to linear prediction analysis to obtain a second set of linear prediction filter (LPC) coefficients. Furthermore, the encoder includes an analysis filter composed of a cascade of time-domain filters controlled by the obtained first set of LPC coefficients and the obtained second set of LPC coefficients.

Abstract: An apparatus for encoding an audio input signal to obtain an encoded audio signal is provided. The apparatus comprises a transformation module configured to transform the audio input signal from an original domain to a transform domain to obtain a transformed audio signal. Moreover, the apparatus comprises an encoding module, configured to quantize the transformed audio signal to obtain a quantized signal, and configured to encode the quantized signal to obtain the encoded audio signal. The transformation module is configured to transform the audio input signal depending on a plurality of predefined power values of quantization noise in the original domain.

Abstract: It is shown an encoder for encoding an audio signal with reduced background noise using linear predictive coding. The encoder includes a background noise estimator configured to estimate background noise of the audio signal, a background noise reducer configured to generate background noise reduced audio signal by subtracting the estimated background noise of the audio signal from the audio signal, and a predictor configured to subject the audio signal to linear prediction analysis to obtain a first set of linear prediction filter (LPC) coefficients and to subject the background noise reduced audio signal to linear prediction analysis to obtain a second set of linear prediction filter (LPC) coefficients. Furthermore, the encoder includes an analysis filter composed of a cascade of time-domain filters controlled by the obtained first set of LPC coefficients and the obtained second set of LPC coefficients.