Encoder-assisted frame loss concealment techniques for audio coding

A non-transitory computer-readable medium comprising instructions for concealing a frame of an audio signal that cause a programmable processor to:

• receive the frame, the frame including frequency-domain data of the audio signal;
• detect one or more errors in the frame;
• discard the frequency-domain data as a result of detecting the errors;
• estimate magnitudes of replacement frequency-domain data for the frame based on frequency-domain data included in neighboring frames of the frame;
• estimate signs of the replacement frequency-domain data for the frame based on a subset of signs for the frame transmitted from an encoder as side-information of a neighboring frame of the frame;
• and
• combine the magnitude estimates and the sign estimates to estimate the replacement frequency-domain data for the frame.

A system for concealing a frame containing frequency-domain data of an audio signal comprising:

• an encoder that transmits a subset of signs for the frame as side-information of a neighboring frame of the frame;
• and
• a decoder including a frame loss concealment (FLC) module that receives the side-information for the frame from the encoder, and an error detection module that detects one or more errors in the frame and discards the frequency-domain data as a result of detecting the errors,
• wherein the FLC module estimates magnitudes of replacement frequency-domain data for the frame based on frequency-domain data of neighboring frames of the frame, estimates signs of the replacement frequency-domain data for the frame based on the subset of signs received as side-information, and combines the magnitude estimates and the sign estimates to estimate the replacement frequency-domain data for the frame.

An encoder comprising:

• a component selection module that selects components of frequency-domain data for a frame of an audio signal;
• and
• a sign extractor that extracts a subset of signs for the selected components from the frequency-domain data for the frame,
• wherein the encoder transmits the subset of signs for the frame to a decoder as side-information of a neighboring frame of the frame.

A decoder comprising:

• an error detection module that detects one or more errors in a frame of an audio signal and discards frequency-domain data of the frame as a result of detecting the errors;
• and
• a frame loss concealment (FLC) module including:
• a magnitude estimator that estimates magnitudes of replacement frequency-domain data for the frame based on neighboring frames of the frame;
• and
• a sign estimator that estimates signs of the replacement frequency-domain data for the frame based on a subset of signs for the frame transmitted from an encoder as side-information of a neighboring frame of the frame,
• wherein the decoder combines the magnitude estimates and the sign estimates to estimate the replacement frequency-domain data for the frame.

An apparatus for concealing a frame of an audio signal comprising:

• means for receiving the frame which includes frequency-domain data of the audio signal;
• means for detecting one or more errors in the frame and discarding the frequency-domain data as a result of detecting the errors;
• means for estimating magnitudes of replacement frequency-domain data for the frame based on frequency-domain data included in neighboring frames of the frame;
• means for estimating signs of the replacement frequency-domain data for the frame based on a subset of signs for the frame transmitted from an encoder as side-information of a neighboring frame of the frame;
• and
• means for combining the magnitude estimates and the sign estimates to estimate the replacement frequency-domain data for the frame.