AND9097/D
http://onsemi.com
7
Stereo Streaming Gain Distribution
Figure 10. Memory Select A Utilities Tab
When HRX is disabled on Ayre SA3291 device, the gain
on the front-end of the system can be adjusted using the
HRXPreGain and HRXPostAtten parameters
(see Figure 10) in combination with the Wideband Gain
parameter to get the desired gain distribution.
Please note that HRXPreGain and HRXPostAtten are
provided to give control over the preamplifier gain settings
when HRX is enabled. Normally the default values should
be used.
Ayre SA3291 Wireless System Consideration
With the configuration of the wireless parameters
properly set, the devices will perform as expected under
normal operating circumstances.
However, because these devices are based on wireless
technology, there are certain situations where the behavior
of the devices needs to be anticipated.
Streaming Reception
Streaming audio will continue to be received when the
user changes memory selects, unless the MS selected does
not have wireless streaming enabled.
Streaming audio will be received until the hearing aid
detects that wireless audio has been missing for the length
of its timeout value “LowPowerDelay”.
If the hearing aid goes out of range of the relay device but
comes back into range before the timeout has expired, it will
reconnect and resume audio output.
If the hearing aid is turned off while streaming and turned
back on, it will not resume streaming until it receives another
wireless command to initiate streaming. (This will need to
be initiated by the relay device.)
If a relay device is transmitting while binaural telecoil is
enabled, it will disrupt the ear-to-ear audio streaming. This
cannot be prevented by the hearing aid, so the relay device
and hearing aid user must manage this scenario.
Remote Control
Ayre SA3291 can receive wireless remote-control
messages from a remote control device.
Remote control functions are supported in all operating
modes with the exception of binaural telecoil modes, where
MS changes are ignored. This is to prevent a streaming audio
source from interrupting a telephone conversation.
The hearing aids will be paired with a remote control at the
time of manufacturing or fitting.
It is possible to wirelessly pair the hearing aid with a new
remote control in the event that the original device is lost or
destroyed.
