Multi-Device Audio Recording Synchronization
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Solution Overview
Problem
Current audio recording systems face challenges in capturing high-quality audio from multiple sources, especially when participants are distant, leading to poor 'far field' capture and time delays that cause interruptions during remote recordings.
Innovation Solution
A method and system that synchronize multiple audio recording devices, including smartphones, using an event manager to provide a unique event identification code and automated start instructions, and employ time-stretching techniques to compensate for time delays, ensuring simultaneous recording and enhancing beamforming for improved audio quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single recording device is used to capture audio from multiple sources, then the device complexity is reduced, but the audio quality deteriorates due to far field capture problems
Solution Approach 1:
The system divides the recording function into multiple independent recording devices, each capturing audio from a specific source or location. This segmentation allows each device to focus on near-field capture of its designated source, improving audio quality while distributing system complexity across multiple simple units rather than one complex centralized device
Solution Approach 2:
The patent combines recordings from multiple devices through post-processing techniques including synchronization and beamforming. By merging the segmented recordings, the system reconstructs high-quality multi-source audio that would be impossible for a single device to capture, effectively combining the advantages of multiple simple recorders into a unified high-fidelity output
2Measurement precision
If fixed microphones are installed in arrays to overcome far field problems, then audio quality is improved, but the infrastructure cost and device complexity increase
Solution Approach 1:
Instead of installing expensive fixed microphone arrays, the system uses multiple inexpensive, portable recording devices that can be temporarily deployed and then removed. These devices serve their purpose for the recording event and can be stored or reused elsewhere, eliminating the need for permanent infrastructure installation while achieving similar audio quality through software-based beamforming
Solution Approach 2:
The patent replaces the mechanical infrastructure of fixed microphone arrays with a software-based solution. Rather than relying on physical microphone positioning and hardware processing, the system uses digital signal processing, synchronization algorithms, and beamforming techniques to achieve the same audio quality improvement, substituting computational complexity for mechanical complexity
3Measurement precision
If multiple recording devices are used to capture audio from different sources, then audio quality is improved, but synchronization difficulty increases
Solution Approach 1:
The system incorporates feedback mechanisms where recording devices exchange timing information and adjust their synchronization based on received signals. This feedback loop allows devices to automatically correct timing drift and align their recordings, reducing the manual synchronization complexity while maintaining high audio quality across multiple sources
4Adaptability or versatility
If participants are geographically separated in remote recording, then adaptability is improved, but time delays increase causing interruptions
Solution Approach 1:
The system performs preliminary synchronization actions before the actual recording begins. Devices establish timing references and coordinate their recording schedules in advance, allowing them to operate independently at remote locations without experiencing disruptive time delays during the actual event. This preliminary coordination enables geographic separation while maintaining temporal alignment
Data Source
AI summary
The present disclosure provides a method and system of recording an audio event which comprises a plurality of audio sources. This comprises: synchronizing a plurality of audio recording devices prior to commencement of the audio event, each recording device being suitably disposed to record audio from a single audio source and operable to provide a single audio source recording for the duration of the audio event; receiving the single audio source recording provided by each of the said audio recording devices; and processing the plurality of received single audio source recordings to synchronously combining the plurality of single audio source recordings to construct a single audio event recording.