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Frame error concealment

A frame error and error frame technology, applied in speech analysis, instruments, etc., can solve unacceptable problems, achieve low complexity, improve subjective audio quality, and reduce storage requirements

Active Publication Date: 2015-10-21
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Another disadvantage of interpolation-based frame error concealment methods is that it introduces additional latency (frames after the error frame must be received before any interpolation can be attempted), which is useful in e.g. real-time applications such as conversational applications. unacceptable

Method used

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Examples

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Embodiment Construction

[0038] Throughout the drawings, the same reference numerals are used for similar or corresponding elements.

[0039] The techniques presented here are generally applicable to modulation lapped transform (MLT) types such as MDCT which is the currently preferred transform. For simplicity of description, only MDCT will be described below.

[0040] Furthermore, the terms lost frame, delayed frame, corrupted frame, and frame including corrupted data in the following description all denote examples of erroneous frames to be reconstructed by the proposed frame error concealment technique. Similarly, the term "good frame" will be used to indicate an error-free frame.

[0041]Using frame repetition algorithms for concealing frame errors in transform codecs using MDCT can degrade the reconstructed audio signal because in the MDCT domain phase information is conveyed in the magnitude and sign of the MDCT coefficients . For pitch or harmonic frequency components, the evolution of the c...

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Abstract

A frame error concealment method based on frames including transform coefficient vectors including the following steps: It tracks (S11) sign changes be- tween corresponding transform coefficients of predetermined sub-vectors of consecutive good stationary frames. It accumulates (S12) the number of sign changes in corresponding sub-vectors of a predetermined number of consecutive good stationary frames. It reconstructs (S13) an erroneous frame with the latest good stationary frame, but with reversed signs of transform coefficients in sub-vectors having an accumulated number of sign changes that exceeds a predetermined threshold.

Description

technical field [0001] The present technique relates to frame error concealment based on frames comprising vectors of transform coefficients. Background technique [0002] High-quality audio transmission can often use transform-based coding schemes. The input audio signal is usually processed in time blocks of a certain size (eg 20ms) called frames. The frame is transformed by a suitable transform, such as the Modified Discrete Cosine Transform (MDCT), and the transform coefficients are quantized and sent over the network. [0003] However, when the audio codec operates in a communication system including wireless or packet networks, frames may be lost in transmission, or arrive too late to be used in real-time scenarios. A similar problem arises when data within a frame is corrupted, and the codec can be set to discard these corrupted frames. The above examples are called frame misses or packet loss, and when they occur the decoder usually invokes certain algorithms to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/005
CPCG10L19/005G10L19/025
Inventor 塞巴斯蒂安·内斯隆德沃洛佳·格兰恰诺夫乔纳斯·斯韦德贝里
Owner TELEFON AB LM ERICSSON (PUBL)