Low power intermittent messaging for hearing assistance devices
First Claim
1. A method for hearing assistance device communications between a transmitter having a first clock and a receiver having a second clock, the method comprising:
- synchronizing the first clock, having a first frequency drift, and the second clock, having a second frequency drift, at a synchronization time;
determining a time interval between the synchronization time and a transmission time of a transmission, wherein the transmission includes a packet;
calculating a drift window using an initial drift window and a potential drift amount between the first clock and the second clock over the time interval including using a calculation of a number of sleep window intervals between the transmission and a second transmission, wherein the initial drift window is a product of a sleep interval and clock accuracy;
transmitting the transmission with the transmitter on a first channel, the transmission including a repetition of packets having a packet length based on the first frequency drift and the second frequency drift and a duration based on the drift window; and
retransmitting the transmission on a second channel when the receiver does not receive the packet on the first channel.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. A method for hearing assistance device communications between a transmitter having a first clock and a receiver having a second clock, the method comprising:
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synchronizing the first clock, having a first frequency drift, and the second clock, having a second frequency drift, at a synchronization time; determining a time interval between the synchronization time and a transmission time of a transmission, wherein the transmission includes a packet; calculating a drift window using an initial drift window and a potential drift amount between the first clock and the second clock over the time interval including using a calculation of a number of sleep window intervals between the transmission and a second transmission, wherein the initial drift window is a product of a sleep interval and clock accuracy; transmitting the transmission with the transmitter on a first channel, the transmission including a repetition of packets having a packet length based on the first frequency drift and the second frequency drift and a duration based on the drift window; and retransmitting the transmission on a second channel when the receiver does not receive the packet on the first channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for hearing assistance device communications for low power intermittent messaging, comprising:
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a receiver including a first clock having a first frequency drift, the receiver adapted to receive on sleep intervals using the first clock as a timer; and a transmitter including a second clock, having a second frequency drift, the transmitter adapted to transmit at a time which is a multiple of the sleep interval using the second clock as a timer, wherein the transmitter is adapted to transmit, on a first channel, a repetition of packets having a packet length that increases with a transmission time between transmissions and having the length based on the first and second frequency drifts and based on a calculation of a number of sleep window intervals between transmissions, the length selected to ensure detection of the packets by the receiver regardless of drift of the first and second clocks; and wherein the transmitter is adapted to retransmit the packets on a second channel when the receiver does not receive the packets on the first channel. - View Dependent Claims (19, 20)
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Specification