Intermittent RF Communication in Hearing Aids
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Solution Overview
Problem
Modern hearing assistance devices face challenges in low power consumption due to high power consumption by RF transceivers for wireless communications, especially in environments with radio frequency interference and intermittent communication needs.
Innovation Solution
A system for low power intermittent communications in hearing assistance devices, which synchronizes clocks between a transmitter and receiver, adjusts preamble length and packet duration based on clock drift, and uses sleep intervals to minimize power consumption and detect signals effectively, allowing for efficient communication even in interference-prone environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RF transceiver operates continuously to ensure reliable communication, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The RF transceiver operates in periodic intervals rather than continuously. The system uses intermittent transmission and reception windows where the transceiver is active only when data needs to be exchanged, followed by sleep periods to conserve power. This periodic operation maintains communication reliability for intermittent control functions while significantly reducing overall power consumption.
Solution Approach 2:
The system performs clock synchronization and drift compensation in advance before actual data transmission. By pre-synchronizing clocks and calculating drift windows before communication events, the system ensures reliable communication timing without requiring continuous monitoring, enabling the transceiver to enter low-power states between predetermined communication windows.
2Reliability
If the RF transceiver uses high power to overcome interference, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts communication parameters including transmission power, packet repetition rate, and preamble length based on detected interference levels and clock drift. Rather than using constant high power, the transceiver adapts its power consumption to the actual communication needs and environmental conditions, maintaining reliability only when necessary while conserving power during low-interference periods.
3Reliability
If the preamble length is increased to account for clock drift, then communication reliability is improved, but transmission time increases
Solution Approach 1:
The system calculates and adjusts the preamble length parameter based on the specific clock drift window for each communication event. Rather than using a fixed long preamble, the system dynamically changes the preamble length to match the actual drift requirements, ensuring reliable synchronization while minimizing unnecessary transmission time overhead.
4Reliability
If the receiver activates continuously to detect signals, then signal detection reliability is improved, but power consumption increases
Solution Approach 1:
The receiver operates in periodic sleep and wake cycles rather than continuously. It activates during predetermined reception windows based on synchronized timing with the transmitter, allowing it to detect signals reliably when transmissions occur while consuming minimal power during sleep intervals between communication events.
Data Source
AI summary
The present subject matter includes a system for communications between a transmitter and a receiver. In various embodiments, the system uses a sleep interval to allow the receiver to go to sleep between wake up times to “sniff” for transmissions from the transmitter. The system adjusts the length of the preamble of the transmitted signal or a repetition of packets to allow the receiver to detect a transmitted signal based on drift in the clocks of the system. In various embodiments, a receive channel is changed if a signal is not received at a prior channel selection. In various embodiments, the transmission is determined by detection of an event. In various embodiments, the event is an ear-to-ear event. In various embodiments, the receiver and transmitter are in opposite hearing aids adapted to be worn by one wearer.