LPC Reference Parameter Coding for Multi-Channel Bit Rate Reduction

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Solution Overview

Problem

Existing LPC parameter coding methods for multi-channel audio signals result in redundant information and high bit rates due to independent coding schemes, and reference coding schemes require excessive calculation when dealing with multiple channels.

Innovation Solution

A method that determines a reference LPC parameter from multiple channels, performs direct coding on this parameter, and residual coding on non-reference parameters based on the reference, reducing redundant information and calculation complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If reference quantization coding is performed on LPC parameters of multiple channels, then redundancy between channels is removed and bit rate is reduced, but calculation complexity increases due to separate residual quantization coding for each channel pair

Engineering Contradiction:

Improvebit rateVSAvoidcalculation complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent segments the multiple channels into a reference channel and non-reference channels. The reference channel's LPC parameters are directly quantized, while non-reference channels use residual quantization based on the reference channel. This segmentation reduces the overall calculation complexity compared to performing full reference quantization between all channel pairs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent merges the quantization process by using a single reference channel for multiple non-reference channels. Instead of performing separate residual quantization for each channel pair, the reference channel's LPC parameters serve as the basis for multiple non-reference channels, combining multiple quantization operations into a unified process that reduces calculation complexity.

Inventive Principle:

Principle #5Merging (Combining)

2Device complexity

If independent coding is used for LPC parameters of each channel, then calculation complexity is reduced, but redundancy between channels remains and bit rate increases

Engineering Contradiction:

Improvecalculation complexityVSAvoidbit rate

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The patent introduces a reference channel as an intermediary between independent channel coding and full multi-channel reference quantization. The reference channel's LPC parameters act as a mediator that non-reference channels can compare against, removing inter-channel redundancy while avoiding the high calculation complexity of comparing every channel pair. This intermediary approach achieves bit rate reduction without proportional increases in calculation complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12633299B2Linear prediction coding parameter coding method and coding apparatus

Publication Date: 2026.05.19 HUAWEI TECH CO LTD

AI summary

A linear prediction coding (LPC) parameter coding method is provided. The method includes: determining a reference LPC parameter from a plurality of LPC parameters, performing direct coding on the reference LPC parameter, and performing reference coding on a non-reference LPC parameter based on the determined LPC parameter. The method includes: obtaining a direct coding result of the reference LPC parameter and determining a residual coding result of the non-reference LPC parameter.