Voice Stream Modification for Speaker Discrimination
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Solution Overview
Problem
In teleconferencing systems, participants often struggle to distinguish between remotely located speakers due to similar sounding voices, poor quality links, and hearing impairments, leading to incorrect assumptions and confusion during and after calls.
Innovation Solution
A method that generates speech profiles for each participant, adjusts spectral characteristics to accentuate differences, and provides modified voice streams to disadvantaged parties, allowing them to better differentiate between similar sounding speakers through pitch and prosodic modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If audio streams are provided to teleconferencing endpoints without modification, then the system maintains simplicity and real-time communication efficiency, but disadvantaged participants cannot discriminate between similar sounding speakers
Solution Approach 1:
The system performs preliminary speech profiling during the first few minutes of the conference call to establish baseline characteristics of each speaker before discrimination is needed. This advance preparation enables rapid comparison and modification when similar sounding speakers are detected, without delaying the actual discrimination function.
Solution Approach 2:
The patent introduces a conferencing unit with speech processing capabilities that acts as an intermediary between the remote speakers and the disadvantaged participant. This intermediary analyzes speech profiles, identifies similar sounding speakers, and applies spectral modifications to differentiate them, resolving the contradiction by adding intelligence at the network level rather than requiring complex end-device modifications.
2Measurement precision
If speech profiles are generated and spectral characteristics are adjusted to differentiate similar sounding speakers, then disadvantaged participants can better discriminate between speakers, but processing time and computational resources increase
Solution Approach 1:
Speech profiles are generated during the initial minutes of the conference call before discrimination is required. This preliminary speech characterization stores baseline acoustic features that enable rapid comparison later, avoiding time-consuming analysis during critical discrimination moments.
Solution Approach 2:
The system applies spectral modification only to specific frequency ranges that contain discriminatory information, rather than processing the entire speech spectrum. This selective processing reduces computational load and time requirements while maintaining discrimination accuracy.
3Measurement precision
If spectral characteristics of voice streams are modified in real-time, then the ability to distinguish similar sounding speakers improves, but the quality and naturalness of the voice stream may deteriorate
Solution Approach 1:
The system applies spectral modifications locally to specific frequency bands that contain speaker-discriminative information, rather than uniformly across the entire speech spectrum. This localized processing preserves the natural quality of voice streams in non-critical frequency regions while enhancing differentiation in critical regions.
Solution Approach 2:
The patent modifies spectral parameters such as pitch and formant frequencies by small, controlled amounts that are sufficient to differentiate similar sounding speakers but remain imperceptible to human listeners. This subtle parameter adjustment maintains voice stream quality and naturalness while achieving the discrimination goal.
4Measurement precision
If the conferencing unit processes and modifies speech for all participants, then speaker discrimination is improved, but the system complexity and computational load increase significantly
Solution Approach 1:
The conferencing unit provides differentiated processing only to disadvantaged participants who require speaker discrimination assistance, while other participants receive unmodified audio streams. This selective application of complexity reduces overall system burden while maintaining discrimination capability where needed.
Solution Approach 2:
The system automatically detects when similar sounding speakers are present and activates speech profile comparison and spectral modification without requiring manual intervention or complex configuration. This self-service approach simplifies operation while maintaining the necessary processing capabilities.
Data Source
AI summary
A communications system is provided that includes:(a) a speech discrimination agent 136 operable to generate a speech profile of a first party to a voice call; and(b) a speech modification agent 140 operable to adjust, based on the speech profile, a spectral characteristic of a voice stream from the first party to form a modified voice stream, the modified voice stream being provided to the second party.