Spatial Parameter Transmission in Audio Encoding

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Solution Overview

Problem

Existing signal processing methods for transmitting and receiving spatial parameters in audio encoding and decoding face challenges in bandwidth efficiency and data exchange speed due to the need for detailed information about stereo signals, which increases data volume and can lead to decreased restoration accuracy when bandwidth is limited.

Innovation Solution

An encoding apparatus that dynamically controls the transmission of a spatial parameter based on the magnitude of input signals, including or excluding a correlation parameter depending on whether the signal magnitude is below a predetermined threshold, to optimize data exchange efficiency without compromising restoration quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the spatial parameter includes detailed correlation information to restore stereo signals exactly, then the restoration accuracy is improved, but the amount of data increases causing bandwidth efficiency to deteriorate

Engineering Contradiction:

Improverestoration accuracyVSAvoidamount of data

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent changes the parameter inclusion status based on signal characteristics. When the stereo signal magnitude is below the threshold, the correlation parameter is excluded from the spatial parameter; when above the threshold, it is included. This dynamic parameter adjustment optimizes the balance between restoration accuracy and data amount.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements a dynamic decision mechanism that adjusts the spatial parameter composition based on real-time signal magnitude comparison with a predetermined threshold. This dynamic adaptation allows the system to optimize data transmission efficiency while maintaining restoration quality only when necessary.

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If the amount of data of the spatial parameter is increased to improve restoration exactness, then the restoration quality is improved, but the speed of data exchange decreases

Engineering Contradiction:

Improverestoration exactnessVSAvoiddata exchange speed

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

The patent dynamically changes the spatial parameter composition by excluding the correlation parameter when signal magnitude is below the threshold, thereby reducing data transmission volume and increasing data exchange speed. When the signal magnitude exceeds the threshold, the correlation parameter is included to maintain restoration exactness.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system dynamically adjusts the spatial parameter data volume based on signal characteristics, enabling fast data exchange when possible and ensuring high restoration quality only when the signal conditions warrant it.

Inventive Principle:

Principle #15Dynamics

3Quantity of substance

If the amount of data of the spatial parameter is decreased to increase bandwidth efficiency, then the bandwidth usage efficiency is improved, but the restoration exactness deteriorates

Engineering Contradiction:

Improveamount of dataVSAvoidrestoration exactness

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The patent selectively changes the spatial parameter composition based on signal magnitude. When the stereo signal is below the threshold, the correlation parameter is excluded to reduce data amount and improve bandwidth efficiency. When above the threshold, the correlation parameter is included to maintain restoration exactness.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system dynamically adapts the spatial parameter data volume to signal conditions, achieving bandwidth efficiency when possible and preserving restoration exactness when signal characteristics require it.

Inventive Principle:

Principle #15Dynamics

4Measurement precision

If the correlation parameter is always transmitted to ensure accurate restoration, then the restoration quality is maintained, but the bandwidth efficiency deteriorates

Engineering Contradiction:

Improverestoration qualityVSAvoidbandwidth efficiency

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The patent changes the correlation parameter transmission status based on signal magnitude comparison with a predetermined threshold. When the stereo signal is below the threshold, the correlation parameter is not transmitted, improving bandwidth efficiency. When above the threshold, it is transmitted to maintain restoration quality.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system dynamically determines whether to transmit the correlation parameter based on real-time signal characteristics, optimizing bandwidth efficiency while maintaining restoration quality only when necessary.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9137617B2Correlation parameter transmitting in an encoding apparatus and decoding apparatus

Publication Date: 2015.09.15 HUAWEI TECH CO LTD

AI summary

An encoding apparatus includes a down-mixing unit for down-mixing first and second input signals, and controlling a spatial parameter comprising or not comprising a first parameter which indicates a correlation between the first and second input signals to be transmitted to a decoding apparatus according to whether any one of the first and second input signals has a magnitude that is equal to or less than a predetermined threshold value; and a transmitting unit for transmitting the spatial parameter to the decoding apparatus.