User manual

43
QUALITYOFSERVICEFORWIRELESSTECHNOLOGYIN
THEWIDEXLINKSYSTEM
WidexLinkwirelesstechnologyenablescommunicationbetween
two partners of a binaural pair of CLEAR hearing aidsandwith
theirmatchedexternaldevicesTherequirementsforthequality
ofservice(QoS)varyamongthevariouscomponentsandtheir
intendeduserscenarios
For programming these requirements include a BER (Bit Error
Rate)betterthan
-
atabitrateofkbitssasemi-duplex
transmissionwitharequiredacknowledgeatransmissionlatency
ineachdirection(x)andareceive-to-transmitmode(RXtoTX)
timeThedataaresavedinthehearingaidevenwhentransmission
isinterrupted
Duringdailyuse therequirementson audio streamingbetween
hearingaidsincludeaBERbetterthan
-
Thecommunicationis
simplexwithabitrateofkbitssTheadditionalaudiodecod-
inginthismoderesultsinalongerlatencywhichislessthanms
For remote control commands the QoS requirements include a
BERbetterthan
-
ThelowerBERrequirementresultsfromre-
dundanttransmissionsEachkeypressresultsintransmissionsof
datapackagesofwhichonlyoneisneededforasuccessfulcom-
munication
Forinter-earcommunicationbetweenhearingaidsaBERbetter
than
-
isrequiredThecommunicationisupdatedeveryms
(orHz)Thehearingaidscontinuetoamplifybasedonthelast
savedsettingsevenwhenthetransmissionrangeisexceededor
whencommunicationisinterfered