AAC Vocabulary Selection Using Rate-Distortion Symbol Optimization

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Solution Overview

Problem

Existing AAC devices suffer from operational noise and distortion due to random physical and cognitive efforts, leading to inefficiencies in symbol selection and communication, particularly for non-verbal individuals with complex needs, as they often lack effective semantic structures and rate-distortion functions.

Innovation Solution

A mathematical model is applied to optimize symbol selection in AAC devices by encoding user inputs as indexes, augmenting them into communication symbols, and displaying optimized symbols based on relevance, while maintaining a low rate-distortion, using a database and processor to enhance communication efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If traditional AAC devices use random symbol selection methods, then device complexity is reduced, but communication distortion increases and information fidelity deteriorates

Engineering Contradiction:

Improvecommunication distortionVSAvoidmathematical model complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent applies rate-distortion theory parameters to transform the symbol selection process. By changing the selection criteria from random to mathematically optimized based on rate-distortion functions, the system minimizes communication distortion while maintaining manageable device complexity through algorithmic optimization.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical/random symbol selection mechanism with an information-theoretic mathematical model. This substitution uses rate-distortion theory to systematically optimize symbol selection, replacing physical randomness with computational optimization to reduce communication distortion.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If AAC devices include comprehensive vocabulary to meet all communicative needs, then adaptability improves, but operational noise and distortion increase

Engineering Contradiction:

Improvevocabulary coverageVSAvoidoperational noise and distortion

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent implements partial action by selecting only the necessary subset of vocabulary items for each communication instance. Rather than presenting all available symbols, the rate-distortion optimization selects the minimal sufficient subset, reducing operational noise while maintaining comprehensive adaptability when needed.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent segments the comprehensive vocabulary into optimized subsets for each communication task. By dividing the full vocabulary into context-relevant groups and applying rate-distortion optimization to each segment, the system maintains adaptability while reducing operational distortion through structured organization.

Inventive Principle:

Principle #1Segmentation

3Productivity

If symbol selection requires extensive cognitive effort for optimization, then communication efficiency improves, but user cognitive load increases

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidcognitive effort required

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent implements self-service by having the mathematical model automatically optimize symbol selection without requiring user cognitive intervention. The rate-distortion function autonomously performs the optimization calculations, freeing the user from cognitive burden while maintaining high communication efficiency through algorithmic self-optimization.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent introduces the rate-distortion mathematical model as an intermediary between the user's communication intent and the symbol selection process. This intermediary handles the complex optimization calculations, translating user intent into optimized symbol selections without requiring the user to directly engage with the mathematical complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Loss of information

If AAC devices use simple symbol arrangement, then ease of operation improves, but information rate and communication fidelity decrease

Engineering Contradiction:

Improveinformation fidelityVSAvoidsymbol selection effort

Core Design Contradiction:

Loss of informationVSEase of operation

Solution Approach 1:

The patent applies dynamics by making the symbol arrangement adaptive rather than static. The rate-distortion optimization dynamically adjusts symbol selection and arrangement based on the specific communication context, maximizing information fidelity while maintaining ease of operation through context-aware adaptation rather than fixed complex structures.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250349227A1Method and system for optimizing vocabulary selection in augmentative and alternative communication (AAC) devices

Publication Date: 2025.11.13 CENT FOR PERCEPTUAL & INTERACTIVE INTELLIGENCE (CPII) LTD

AI summary

Disclosed is a novel method and system for optimizing vocabulary selection in Augmentative and Alternative Communication (AAC) devices. The method involves receiving user input, encoding it into a sequence of indexes, augmenting and alternating the sequence of indexes into a plurality of communication symbols, generating optimal communication symbols for an optimized symbols selection, selecting the optimal communication symbols based on relevance to user input, and, displaying the optimized symbols for the sentence writing on a display interface of the AAC device.