US 7,548,852 B2 · Quality of decoded audio by adding noise

Abstract

The present invention relates to a method of encoding and decoding an audio signal. The invention further relates to an arrangement for encoding and decoding an audio signal. The invention further relates to a computer-readable medium comprising a data record indicative of an audio signal and a device for communicating an audio signal having been encoded according to the present invention. By the method of encoding, a double description of the signal is obtained, where the encoding comprises two encoding steps, a first standard encoding and an additional second encoding. The second encoding is able to give a coarse description of the signal, such that a stochastic realization can be made and appropriate parts can be added to the decoded signal from the first decoding. The required description of the second encoder in order to make the realization of a stochastic signal possible requires a relatively low bit rate, while other double/multiple descriptions require a much higher bit rate.

Claims12

Dependent claims

A method of encoding an audio signal, said method comprising the step of generating a code signal from the audio signal according to a predefined coding method, wherein the method further comprises the steps of:

transforming the audio signal into a set of transformation parameters defining at least a part of the spectro-temporal information in said audio signal, said transformation parameters enabling generation of a noise signal having spectro-temporal characteristics substantially similar to said audio signal;
and
representing said audio signal by said code signal and said transformation parameters.

A method of decoding an audio signal from transformation parameters and a code signal generated according to a predefined coding method ,the method comprising the steps of:

decoding said code signal into a first audio signal using a decoding method corresponding to said predefined coding method;
generating, from said transformation parameters, a noise signal having spectro-temporal characteristics substantially similar to said audio signal;
generating a second audio signal by removing from the noise signal spectro-temporal parts of the audio signal that are already contained in the first audio signal;
and
generating the audio signal by adding the first audio signal and the second audio signal.

2 more elements

Dependencies are inferred from the claim text.

Quality of decoded audio by adding noise

Life of this patent

Quality of decoded audio by adding noise

Life of this patent

Abstract

Claims12