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

Patent metadata

Field	Value
Publication number	US-9280975-B2
Application number	US-201314035026-A
Country	US
Kind code	B2
Filing date	Sep 24, 2013
Priority date	Sep 24, 2012
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

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.

First claim

What is claimed is:

1. A frame error concealment method comprising:
when a frame is classified as a current error frame or a next good frame after an error frame, selecting 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
performing a corresponding time domain error concealment processing on the frame based on the selected mode.

2. The method of claim 1 , further comprising performing a frequency domain error concealment processing on the frame when the frame is the current error frame.

3. The method 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.

4. The method of claim 3 , wherein the first parameter is generated using energy and spectral coefficients of sub-bands in the good frame.

5. The method of claim 1 , wherein when the first mode is selected, the performing a corresponding time domain error concealment processing is based on copying a phase-matched time domain signal obtained from a plurality of previous good frames.

6. The method of claim 1 , wherein when the first mode is selected, the performing a corresponding time domain error concealment processing is based on whether the frame is a single error frame, a burst error frame or the next good frame.

7. The method of claim 1 , wherein when the second mode is selected, the performing a corresponding time domain error concealment processing is based on whether the frame is a single error frame, a burst error frame or the next good frame.

8. The method of claim 1 , wherein when the first mode is selected and the frame is the current error frame, the performing a corresponding time domain error concealment processing is based on copying a phase-matched time domain signal obtained from a plurality if previous good frames, to the frame and smoothing processing between the frame and adjacent frames.

9. The method of claim 8 , wherein the smoothing processing includes processing on a beginning part and an end part of the current error frame.

10. The method of claim 8 , wherein the smoothing processing includes processing on a beginning part of the current error frame.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Sung Ho-Sang
• Lee Nam-Suk

Classifications

• G10L19/005 Primary

  Correction of errors induced by the transmission channel, if related to the coding algorithm · CPC title

• G10L19/0204 Primary

  using subband decomposition · CPC title

• G10L19/22

  Mode decision, i.e. based on audio signal content versus external parameters · CPC title

• G10L19/12

  the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders · CPC title

• G10L19/025

  Detection of transients or attacks for time/frequency resolution switching · CPC title