Acoustic Echo Detection for Speakerphone Confidentiality
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Solution Overview
Problem
Current voice communication systems lack a reliable method to indicate whether a remote party is using a speakerphone, as existing echo detection and cancellation technologies do not provide a user with a signal to confirm speakerphone use, especially when acoustic echoes are not perceptible.
Innovation Solution
A system and method that includes an echo detector and discriminator within a telecommunications system to analyze voice signals for the presence of echoes, differentiate between hybrid and acoustic echoes, and generate a warning signal to the user if the characteristics of the acoustic echo suggest the remote party is using a speakerphone, utilizing attributes like bulk delay values and magnitude to determine the likelihood of speakerphone use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If echo cancellation techniques are used to reduce echoes in voice communications, then echo quality is improved, but the system cannot provide a reliable indicator to the user about speakerphone use by the remote party
Solution Approach 1:
The system provides feedback to the user about the remote party's speakerphone status by analyzing echo characteristics and generating visual or audible warnings when acoustic echoes are detected, enabling the user to understand the communication environment without compromising echo cancellation performance
Solution Approach 2:
The echo detection system segments different types of echoes (acoustic vs. hybrid) by analyzing specific characteristics such as bulk delay values and magnitude, allowing the system to provide targeted information about speakerphone use while maintaining overall echo cancellation effectiveness
2Ease of operation
If the user relies on perceptible acoustic echoes to detect speakerphone use, then simplicity is maintained, but reliability is reduced because not all echoes are perceptible
Solution Approach 1:
The system replaces the user's reliance on human perception of acoustic echoes with an automated electronic detection system that analyzes echo characteristics (bulk delay values, magnitude) to reliably detect speakerphone use even when echoes are not perceptible to the human ear
Solution Approach 2:
The echo detector acts as an intermediary between the communication system and the user, automatically analyzing echo characteristics and providing processed information (visual/audible warnings) that reliably indicates speakerphone status without requiring direct human perception of the echoes
3Object-affected harmful factors
If echo cancellers measure bulk echo delay to cancel echoes, then echo cancellation is achieved, but the system complexity increases without providing user feedback capability
Solution Approach 1:
The echo detector is designed to perform multiple functions: it measures bulk echo delay for echo cancellation purposes, analyzes echo characteristics to detect speakerphone use, and provides user feedback through visual or audible warnings, thereby eliminating the need for separate systems and reducing overall complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides a user with a reliable visual or audible warning about the potential use of a speakerphone by the remote party, enhancing confidentiality in communications and improving the quality of voice transmissions by addressing the issue of acoustic echoes.
Implementation Method 1
acoustic feedback that may be created by use of a speakerphone by a remote party. Acoustic feedback originates as a voice signal generated by the user and transmitted to a remote party's location. The received voice signal is broadcast by the speaker in the remote party's speakerphone, the broadcasted voice signal reflects off the enclosed area and is picked up by the microphone of the speakerphone.
Implementation Method 2
One source of echo is simple acoustic reverberation generated at the user's physical location. For example, if the user employs a speakerphone, the user's voice may reflect off the surrounding environmental structure, such as the walls and ceiling. The reflected sound waves result in a plurality of random acoustic paths that are received by the microphone of the speakerphone.
Data Source
AI summary
A system and method are provided for detecting acoustic echo in a telecommunications transmission. Detected acoustic echo is analyzed to determine if the acoustic echo includes characteristics indicative of use of a speakerphone by a remote party. Specific characteristics analyzed include the presence of multiple bulk delay values, echo magnitude, and the length of time for echo delays present within the telecommunications system. If the detected acoustic echo falls outside the range of acceptable parameters, or otherwise exceeds threshold limits, a warning signal is transmitted to the user indicating a high likelihood that the remote party is using a speakerphone. Warning the user of speakerphone use by the remote party can be helpful in ensuring that the communications between the parties is maintained in confidence.