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 plurality of repeated transmissions, wherein a first transmission of the plurality of transmissions transmits a packet having a packet length based on the first frequency drift and the second frequency drift;
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 first transmission and a second transmission of the plurality of transmissions, wherein the initial drift window is a product of a sleep interval and clock accuracy; and
transmitting the plurality of repeated transmissions with the transmitter, including transmitting the first transmission on a first channel and retransmitting the first transmission on a second channel when the receiver does not receive the packet on the first channel, each transmission having a preamble having a preamble length based on the drift window, the plurality of transmissions having a duration of at least a wake interval.
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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. In one variation, the system repeats a transmission for at least a duration of a wake interval. 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.
63 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 plurality of repeated transmissions, wherein a first transmission of the plurality of transmissions transmits a packet having a packet length based on the first frequency drift and the second frequency drift; 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 first transmission and a second transmission of the plurality of transmissions, wherein the initial drift window is a product of a sleep interval and clock accuracy; and transmitting the plurality of repeated transmissions with the transmitter, including transmitting the first transmission on a first channel and retransmitting the first transmission on a second channel when the receiver does not receive the packet on the first channel, each transmission having a preamble having a preamble length based on the drift window, the plurality of transmissions having a duration of at least a wake interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for hearing assistance device communications, 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 a plurality of repeated packets of a duration of at least a wake interval, including transmitting a first packet of the plurality of packets on a first channel, the duration based on the first and second frequency drifts and based on a calculation of a number of sleep window intervals between transmissions, and wherein the transmitter is adapted to retransmit the first packet on a second channel when the receiver does not receive the first packet on the first channel. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification