Frame error concealment method and apparatus, and audio decoding method and apparatus
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.
1. A frame error concealment apparatus comprising:
at least one processor configured to:
when a frame is classified as a current error frame or a next good frame after an error frame, select one mode from among a plurality of modes including a first mode using phase matching and a second mode using repetition and smoothing, based on a plurality of parameters including stationarity of the frame; and
perform a corresponding error concealment processing on the frame based on the selected mode.
2. The apparatus of claim 1 , wherein the plurality of parameters include a first parameter, which is generated to determine whether the first mode is used in a next error frame for a good frame, and a second parameter, which is generated according to whether the first mode is used in a previous frame of the frame.
3. The apparatus of claim 2 , wherein the first parameter is generated using energy and spectral coefficients of sub-bands in the good frame.
4. The apparatus of claim 1 , wherein when the first mode is selected, the performing a corresponding error concealment processing is based on whether the frame is a single error frame, a burst error frame or the next good frame.
5. The apparatus of claim 1 , wherein when the second mode is selected, the performing a corresponding error concealment processing is based on whether the frame is a single error frame, a burst error frame or the next good frame.
6. The apparatus of claim 1 , wherein when the first mode is selected, the performing a corresponding error concealment processing is based on copying a phase-matched signal obtained from a plurality of previous good frames.
7. The apparatus of claim 1 , wherein when the first mode is selected and the frame is the current error frame, the performing a corresponding error concealment processing is based on copying a phase-matched signal obtained from a plurality of previous good frames, to the frame and smoothing processing between the frame and adjacent frames.
8. The apparatus of claim 7 , wherein the smoothing processing includes processing on a beginning part of the current error frame.
9. The apparatus of claim 7 , wherein the smoothing processing includes processing on a beginning part and an end part of the current error frame.
10. The apparatus of claim 1 , wherein the processor is configured further to perform a frequency domain error concealment processing on the frame when the frame is the current error frame.