Noise attenuation at a decoder

A decoder for decoding a frequency-domain input signal defined in a bitstream, the frequency-domain input signal being subjected to noise, the decoder comprising:

• a bitstream reader to provide, from the bitstream, a version of the frequency-domain input signal as a sequence of frames, each frame being subdivided into a plurality of bins, each bin comprising a sampled value;
• a context definer configured to define a context for one bin under process, the context comprising at least one additional bin in a predetermined positional relationship with the bin under process;
• a statistical relationship and information estimator configured to provide statistical relationships between the bin under process and the at least one additional bin and information regarding the bin under process and the at least one additional bin, wherein the relationships and information comprise a variance-related and/or standard-deviation-value-related value on the basis of variance-related and covariance-related relationships between the bin under process and the at least one additional bin of the context to a value estimator,
• wherein the statistical relationship and information estimator comprises a noise relationship and information estimator configured to provide statistical relationships and information regarding noise, wherein the statistical relationships and information regarding noise comprise, for each bin, a ceiling value and a floor value for estimating the signal on the basis of the expectation of the signal to be between the ceiling value and the floor value;
• the value estimator being configured to process and acquire an estimate of the value of the bin under process on the basis of the estimated statistical relationships between the bin under process and the at least one additional bin and the information regarding the bin under process and the at least one additional bin, and the statistical relationships and information regarding noise;
• and
• the decoder further comprising a transformer to transform the estimate into a time-domain signal.

A method for decoding a frequency-domain input signal defined in a bitstream, the frequency-domain input signal being subjected to noise, the method comprising:

• providing, from a bitstream, a version of a frequency-domain input signal as a sequence of frames, each frame being subdivided into a plurality of bins, each bin comprising a sampled value;
• defining a context for one bin under process of the frequency-domain input signal, the context comprising at least one additional bin in a predetermined positional relationship, in a frequency/time space, with the bin under process;
• on the basis of statistical relationships between the bin under process and the at least one additional bin, information regarding the bin under process and the at least one additional bin, statistical relationships and information regarding noise, wherein the statistical relationships is provided in form of covariances or correlations and the information is provided in form of variances or autocorrelations, wherein the statistical relationships and information regarding noise comprise a noise matrix estimating relationships among noise signals among the bin under process and the at least one additional bin;
• estimating the value of the bin under process;
• and
• transforming the estimate into a time-domain signal.

A method for decoding a frequency-domain input signal defined in a bitstream, the frequency-domain input signal being subjected to noise, the method comprising:

• providing, from a bitstream, a version of a frequency-domain input signal as a sequence of frames, each frame being subdivided into a plurality of bins, each bin comprising a sampled value;
• defining a context for one bin under process of the frequency-domain input signal, the context comprising at least one additional bin in a predetermined positional relationship, in a frequency/time space, with the bin under process;
• on the basis of statistical relationships between the bin under process and the at least one additional bin, information regarding the bin under process and the at least one additional bin, statistical relationships and information regarding noise, wherein the statistical relationships and information comprise a variance-related and/or standard-deviation-value-related value provided on the basis of variance-related and covariance-related relationships between the bin under process and at least one additional bin of the context, wherein the statistical relationships and information regarding noise comprise, for each bin, a ceiling value and a floor value for estimating the signal on the basis of the expectation of the signal to be between the ceiling value and the floor value;
• estimating the value of the bin under process;
• and
• transforming the estimate into a time-domain signal.

A non-transitory digital storage medium having a computer program stored thereon to perform the method for decoding a frequency-domain input signal defined in a bitstream, the frequency-domain input signal being subjected to noise, said method comprising:

• providing, from a bitstream, a version of a frequency-domain input signal as a sequence of frames, each frame being subdivided into a plurality of bins, each bin comprising a sampled value;
• defining a context for one bin under process of the frequency-domain input signal, the context comprising at least one additional bin in a predetermined positional relationship, in a frequency/time space, with the bin under process;
• on the basis of statistical relationships between the bin under process and the at least one additional bin, information regarding the bin under process and the at least one additional bin, statistical relationships and information regarding noise, wherein the statistical relationships is provided in form of covariances or correlations and the information is provided in form of variances or autocorrelations, wherein the statistical relationships and information regarding noise comprise a noise matrix estimating relationships among noise signals among the bin under process and the at least one additional bin;
• estimating the value of the bin under process;
• and
• transforming the estimate into a time-domain signal,
• when said computer program is run by a computer.

A non-transitory digital storage medium having a computer program stored thereon to perform the method for decoding a frequency-domain input signal defined in a bitstream, the frequency-domain input signal being subjected to noise, said method comprising:

• providing, from a bitstream, a version of a frequency-domain input signal as a sequence of frames, each frame being subdivided into a plurality of bins, each bin comprising a sampled value;
• defining a context for one bin under process of the frequency-domain input signal, the context comprising at least one additional bin in a predetermined positional relationship, in a frequency/time space, with the bin under process;
• on the basis of statistical relationships between the bin under process and the at least one additional bin, information regarding the bin under process and the at least one additional bin, statistical relationships and information regarding noise, wherein the statistical relationships and information comprise a variance-related and/or standard-deviation-value-related value provided on the basis of variance-related and covariance-related relationships between the bin under process and at least one additional bin of the context, wherein the statistical relationships and information regarding noise comprise, for each bin, a ceiling value and a floor value for estimating the signal on the basis of the expectation of the signal to be between the ceiling value and the floor value;
• estimating the value of the bin under process;
• and
• transforming the estimate into a time-domain signal,
• when said computer program is run by a computer.