Disclosed are a frame error concealment method and apparatus and an audio decoding method and apparatus The frame error concealment (FEC) method includes: selecting an FEC mode based on at least one of a state of at least one frame and a phase matching flag, with regard to a time domain signal generated after time-frequency inverse transform processing; and performing corresponding time domain error concealment processing on the current frame based on the selected FEC mode, wherein the current frame is an error frame or the current frame is a normal frame when the previous frame is an error frame

Frame error concealment method and apparatus, and audio decoding method and apparatus

An apparatus for decoding an audio signal includes a receiving interface, wherein the receiving interface is configured to receive a first frame and a second frame. Moreover, the apparatus includes a noise level tracing unit for determining noise level information being represented in a tracing domain. Furthermore, the apparatus includes a first reconstruction unit for reconstructing a third audio signal portion of the audio signal depending on the noise level information and a second reconstruction unit for reconstructing a fourth audio signal portion depending on noise level information being represented in the second reconstruction domain.

Apparatus and method for improved signal fade out for switched audio coding systems during error concealment

An apparatus for decoding an encoded audio signal to obtain a reconstructed audio signal is provided. The apparatus comprises a receiving interface (1210) for receiving one or more frames comprising information on a plurality of audio signal samples of an audio signal spectrum of the encoded audio signal, and a processor (1220) for generating the reconstructed audio signal. The processor (1220) is configured to generate the reconstructed audio signal by fading a modified spectrum to a target spectrum, if a current frame is not received by the receiving interface (1210) or if the current frame is received by the receiving interface (1210) but is corrupted, wherein the modified spectrum comprises a plurality of modified signal samples, wherein, for each of the modified signal samples of the modified spectrum, an absolute value of said modified signal sample is equal to an absolute value of one of the audio signal samples of the audio signal spectrum. Moreover, the processor (1220) is configured to not fade the modified spectrum to the target spectrum, if the current frame of the one or more frames is received by the receiving interface (1210) and if the current frame being received by the receiving interface (1210) is not corrupted.

Apparatus and method realizing a fading of an mdct spectrum to white noise prior to fdns application

An apparatus for generating an error concealment signal, comprises: an LPC representation generator (100) for generating a replacement LPC representation; a gain calculator (600) for calculating a gain information from the LPC representations; a compensator (406, 408) for compensating a gain influence of the replacement LPC representation using the gain information; and an LPC synthesizer (106, 108) for filtering codebook information using the replacement LPC representation to obtain the error concealment signal, wherein the compensator (406, 408, 900) is configured for weighting the codebook information or an LPC synthesis output signal.

Apparatus, method and corresponding computer program for generating an error concealment signal using power compensation

An apparatus for generating an error concealment signal, includes: an LPC representation generator for generating a replacement LPC representation; an LPC synthesizer for filtering a codebook information using the replacement LPC representation; and a noise estimator for estimating a noise estimate during a reception of good audio frames, wherein the noise estimate depends on the good audio frames representation generator is configured to use the noise estimate estimated by the noise estimator in generating the replacement LPC representation.

Apparatus and method for generating an error concealment signal using an adaptive noise estimation

A decoder and method of decoding a sub-band coded digital audio signal. The decoder comprises: an input, for receiving sub-band coefficients for a plurality of sub-bands of the audio signal; an error detection unit (20), adapted to analyze the content of a sequence of coefficients in one of the sub-bands, to derive for each coefficient an indication of whether the coefficient has been corrupted by an error of a predefined type; an error masking unit (30), adapted to generate from the sequence a modified sequence of coefficients for the sub-band, wherein errors of the predefined type are attenuated; a coefficient combination unit (40), adapted to combine the received coefficients and the modified coefficients, in dependence upon the indication of error; and a signal reconstruction unit (50), adapted to reconstruct the audio signal using the combined coefficients.

Error concealment for sub-band coded audio signals

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Error concealment for sub-band coded audio signals