Apparatus and method for concealing frame erasure and voice decoding apparatus and method using the same

Patent metadata

Field	Value
Publication number	US-9524721-B2
Application number	US-201514980927-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Jul 27, 2005
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

An apparatus and method for concealing frame erasure and a voice decoding apparatus and method using the same. The frame erasure concealment apparatus includes: a parameter extraction unit determining whether there is an erased frame in a voice packet, and extracting an excitement signal parameter and a line spectrum pair parameter of a previous good frame; and an erasure frame concealment unit, if there is an erased frame, restoring the excitement signal and line spectrum pair parameter of the erased frame by using a regression analysis from the excitement signal and line spectrum pair parameter of the previous good frame. According to the method and apparatus, by predicting and restoring the parameter of the erased frame through the regression analysis, the quality of the restored voice signal can be enhanced and the algorithm can be simplified.

First claim

What is claimed is:

1. An apparatus of concealing frame erasure, the apparatus comprising:
at least one processing device configured to:
receive a bitstream transmitted from an encoder;
predict a first parameter of an erased frame in the bitstream, by performing a linear regression analysis on a second parameter obtained from a plurality of previous good frames;
obtain a gain parameter between the predicted first parameter of the erased frame and a second parameter of the previous good frame from among the plurality of previous good frames;
conceal the erased frame, by applying the gain parameter to the previous good frame; and
generate a reconstructed sound signal based on the concealed erased frame.

2. The apparatus of claim 1 , wherein the first and second parameters comprise a spectral parameter.

3. An apparatus of decoding a bitstream, the method comprising:
at least one processing device configured to:
receive a bitstream transmitted from an encoder;
decode a frame with no error in the bitstream;
predict a first parameter of an erased frame in the bitstream, by performing a linear regression analysis on a second parameter obtained from a plurality of previous decoded frames;
obtain a gain parameter between the first parameter of the erased frame and a second parameter of the previous good frame from among the plurality of previous good frames;
conceal the erased frame, by applying the gain parameter to the previous decoded frame; and
generate a reconstructed sound signal based on the concealed erased frame and the decoded frame.

4. The apparatus of claim 3 , wherein the first and second parameters comprise a spectral parameter.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Sung Hosang
• Lee Kangeun
• Choi Seungho

Classifications

• G10L19/06

  Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients · CPC title

• G10L19/07

  Line spectrum pair [LSP] vocoders · CPC title

• G10L19/12

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

• G10L19/083

  the excitation function being an excitation gain (G10L25/90 takes precedence) · CPC title

• G10L2019/0002

  Codebook adaptations · CPC title