Wireless Microphone System Redundant Audio Transmission
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Solution Overview
Problem
Hearing-impaired individuals face difficulties in noisy and reverberant environments due to inadequate audibility and signal-to-noise ratio challenges, which conventional hearing aids and FM systems cannot effectively address, especially in situations involving multiple talkers.
Innovation Solution
A wireless communication system with transmit and receive units that redundantly transmit digital audio packets in dedicated slots, using group codes for synchronization and noise rejection, allowing multiple users to communicate effectively by summing audio signals from multiple microphones and reducing latency and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hearing aids are used, then hearing sensitivity is improved, but speech intelligibility in noisy environments remains inadequate
Solution Approach 1:
The system segments the audio environment by using multiple microphones to capture different spatial audio signals, then processes these segmented signals separately through wireless transmission to hearing aids, allowing selective enhancement of speech signals while suppressing noise in each spatial segment
Solution Approach 2:
Wireless audio signals serve as an intermediary between the acoustic environment and the hearing aid, carrying processed speech information that bridges the gap between environmental noise and the user's auditory system, enabling speech intelligibility without requiring direct acoustic coupling
2Loss of information
If FM systems are used, then signal-to-noise ratio is improved, but adaptability to multiple talkers deteriorates
Solution Approach 1:
The system divides the audio spectrum and spatial domain into multiple segments using array processing techniques, allowing separate tracking and enhancement of multiple speech sources simultaneously, thereby maintaining SNR improvement while adapting to multiple talkers
Solution Approach 2:
The system dynamically adapts to changing speech environments by continuously tracking multiple talkers, adjusting beamforming weights and signal processing parameters in real-time to follow moving speakers and maintain optimal SNR for each identified speech source
3Loss of information
If multiple microphones are used, then speech intelligibility is improved, but device complexity increases
Solution Approach 1:
The system extracts the complex signal processing functions from the hearing aid and relocates them to external audio processors, leaving the hearing aid itself simpler while achieving enhanced speech intelligibility through wireless transmission of processed signals
Solution Approach 2:
Wireless communication protocols serve as an intermediary that simplifies the connection between multiple microphones and hearing aids, managing the complexity of coordinating multiple devices through standardized wireless interfaces rather than requiring complex direct connections
4Reliability
If redundant transmission slots are used, then reliability is improved, but power consumption increases
Solution Approach 1:
The system uses periodic transmission slots where audio data is transmitted at regular intervals rather than continuously, with redundant transmissions occurring only in dedicated periodic slots, thereby maintaining reliability through repetition while reducing overall power consumption compared to continuous transmission
Solution Approach 2:
The system maintains continuous useful audio transmission during dedicated slots while allowing the receiver to enter low-power states during non-dedicated slots, ensuring uninterrupted speech communication when needed while minimizing power consumption during periods when transmission is not critical
Data Source
AI summary
Systems and methods for wireless communication can include a first unit configured to synchronously transmit a first digital audio packet redundantly in at least a first dedicated slot and a second dedicated slot over a time period, and a second unit configured to receive wireless transmissions from the first unit. In certain embodiments, the second unit does not listen for a transmission in the second dedicated slot if the first digital audio packet is received in the first dedicated slot. In certain embodiments, the units are encoded with a group code that identifies group members, such that the units only receive data packets transmitted by group members with the same group code.