Digital Signal Error Concealment with Distributed Complexity
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Solution Overview
Problem
Current digital signal processing techniques face high computational complexity when dealing with transmission errors, particularly in mobile and packet networks, leading to increased energy consumption and reduced battery autonomy in mobile devices, due to the need for extensive analysis and extrapolation of erased frames in coding schemes like CELP and PCM.
Innovation Solution
A method that distributes the calculation load by performing preparation and concealment steps in different time intervals, reducing the worst-case complexity and energy consumption by executing these steps over multiple frames rather than during the occurrence of an erased frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extensive analysis and extrapolation of erased frames is performed during the occurrence of transmission errors, then transmission error concealment quality is improved, but computational complexity and energy consumption increase
Solution Approach 1:
The patent performs the complex analysis step during valid frames (when data is available) rather than during erased frames. The decoder analyzes the signal characteristics and prepares concealment parameters in advance, so that when transmission errors occur, the actual concealment operation can be performed quickly with minimal computational load, thus reducing energy consumption during error events while maintaining concealment quality.
2Reliability
If extensive analysis and extrapolation of erased frames is performed during the occurrence of transmission errors, then transmission error concealment quality is improved, but computational complexity increases
Solution Approach 1:
The complex signal analysis and parameter preparation are performed during valid frames when computational resources are available, distributing the computational load over time. This prevents complexity spikes during erased frames while maintaining the ability to perform high-quality concealment when needed.
Solution Approach 2:
The concealment process is divided into two distinct steps: an analysis step that requires extensive computation and a concealment operation step that requires minimal computation. By segmenting the process this way, the patent reduces the instantaneous computational complexity during error events while maintaining overall concealment quality.
3Reliability
If preparation and concealment steps are performed during the occurrence of an erased frame, then transmission error concealment is achieved, but processing efficiency decreases
Solution Approach 1:
The analysis and preparation of concealment parameters are performed in advance during valid frames, so that when an erased frame occurs, the actual concealment operation can be executed efficiently without the overhead of extensive analysis during the error event, thereby improving processing efficiency while maintaining concealment capability.
Data Source
AI summary
The present invention relates to a method of transmission error concealment in a digital signal split up into a plurality of successive frames associated with different time intervals in which, on reception, the signal might comprise erased frames and valid frames and in order to replace at least the first erased frame (N) after a valid frame, at least two steps are performed, a first step (E1) of preparation not producing any missing sample and comprising at least one analysis of a valid decoded signal and a second step (E2) of concealment producing the missing samples of the signal corresponding to said erased frame. The first step and the second step are executed in different time intervals.The invention relates also to a device of concealment implementing the method according to the invention as well as a decoder comprising such a device. The invention allows the distribution of the error concealment complexity on different time intervals.