Mobile Device Audio Delay Compensation for Conference Call Synchronization
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Solution Overview
Problem
Current conference call technologies face challenges in maintaining effective audio delay compensation between mobile communication devices, leading to decreased speech quality and intelligibility due to network delay differences, which are not adequately addressed by existing solutions.
Innovation Solution
Incorporating a delay unit in mobile communication devices to measure and compensate for network delay differences by delaying audio signals, ensuring synchronized mixing and reducing echo and leakage issues through adaptive filtering and echo cancellation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio signals are transmitted across multiple mobile communication devices during a conference call, then communication versatility and participant coverage are improved, but network delay differences cause speech quality degradation and intelligibility loss
Solution Approach 1:
The system dynamically adjusts the delay parameter of audio signals based on measured network delay differences between devices. By changing the time delay parameter adaptively, the system compensates for network variations and maintains synchronized audio playback across all participants, thereby preserving speech quality while enabling versatile conference call participation
2Manufacturing precision
If audio signals are delayed to compensate for network delay differences, then speech quality and synchronization are improved, but the complexity of the communication system increases
Solution Approach 1:
Each mobile communication device autonomously measures its own network delay to the mixer and automatically calculates the appropriate delay compensation without requiring external control or complex centralized management. This self-service approach enables accurate audio synchronization while minimizing system complexity by distributing the compensation function to individual devices
3Object-generated harmful factors
If echo cancellation and adaptive filtering techniques are implemented, then harmful echo and leakage are reduced, but device complexity and processing requirements increase
Solution Approach 1:
The system employs feedback mechanisms where each device monitors its own audio output and uses adaptive filtering to cancel echo and leakage in real-time. The feedback loop continuously adjusts filter parameters based on detected acoustic conditions, effectively reducing harmful artifacts while managing processing complexity through efficient adaptive algorithms
Data Source
AI summary
A first mobile communication device that includes a first microphone, a first speaker, and a first delay unit. The first microphone is configured to (i) receive, during a conference call, a first user first microphone signal from a first user, and (ii) output a first microphone digital signal to the first delay unit. The first user first microphone signal represents audio content outputted by the first user. The first delay unit is configured to delay, by a delay period, the first microphone digital signal to provide a delayed first user first device digital signal. The first mobile communication device is configured to output, to a mixer, the delayed first user first device digital signal. The delay period is determined based on measurements executed by at least one mobile communication device out of the first mobile communication device, a second mobile communication device and a third mobile communication device.