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requirements for products which are intended for use in the hearing aid ecosystem
tmap the telephony and media audio profile this aims to cover the main
features of the classic hfp and adp profiles adding in new capabilities arising
from the bluetooth le audio topologies
pbp the public broadcast profile which is a foundation of the bluetooth le
audio sharing use case see chapter it identifies t hat a broadcast audio
stream can be received by a ny bluetooth le audio acceptor
these are publicly available in draft form but are still subject to change the contents of this
chapter reflect their state at the time of writing which is documented in s ection
the hearing access profile and service were p reviously called the hearing aid profile and service
but the names were changed as the term hearing aid has a specific regulated medical meaning in
some countries so a declar ation that a product complied with a hearing aid specification could cause
confusion
section haps the hearing access profile and service
as the whole of the bluetooth le audio development was started by the hearing aid industry
it seems only fair to start with hap and has
haps the hearing access profile and service
the hearing access profile and service have been designed to meet the requirement s of
devices which are used in the hearing aid ecosystem which covers hearing aids products
which supply audio streams to hearing aids and accessories which are used to control them
hearing aids are different to earbuds and other acceptors because they are always on
capturing and processing ambient sound to assist their wearers that means that all of the use
cases driving the hearing access profile envisage bluetooth le audio as an additional audio
stream to the ambient one this makes them unusual as bluetooth connectivity is not the de
facto reason for buying the m they also differ in that everyone who wears them has hearing
loss so they have a differen t balance in requirements between audio quality and hence qos
settings and battery life taking your hearing aid out to recharge it during the day is a far
more significant action than it is for an earbud wearer as you may not be able to hear during
that time pushing up audio quality increases the power consumption so t he hearing access
profi le imposes no additional qos requirements over the settings mandated by bap using
the lc codec settings for voice khz sampling rate khz bandwidth and the
codec settings for music khz sampling rate khz bandwidth as many hearing aids do
not occlude the ear ambient sounds can be heard in addition to the bluetooth stream for
this reason hearing aids generally prefer to use the low latency qos settings to avoid echo
between the ambient and transmitted sound
the hap specificatio n describes the physical device configuration of products recognised as
hearing aids the profile defines four different configurations of acceptors all of which are
included in the general term hearing aid through the document these are
a single hearing aid which renders a sin gle bl uetooth le audio stream
a single hearing aid that receives separate left and right audio streams and
combines the decoded audio into a sin gle audio channel
a pair of hearing aids also called a binaural hearing aid set which are the
members of a coordinated set supporting individual left and right audio channels
for each ear and
a hearing aid that uses a single bluetooth link but provides separate left and right
audio outputs to each ear these are called banded hearing aids where there is a
wired connection between the hearing aid device in each ear and the bluetooth
transceiver which is typically in a neckband or an overthehead band
chapter top level bluetooth le audio profiles
the hearing ac cess profile defines four different roles for the hearing aid ecosystem
ha hearing aid which is any one of the four types of hearing aid described
above
hauc hearing aid unicast client which is an initiator which can establish a
unicast audio strea m with a hearing aid the unicast audio streams can be
unidirectional or bidirectional
habs hearing aid broadcast sender which is an initiator transmitting broadcast
audio streams and
harc hearing aid remote controller which is a device that controls volume
levels mute states and hearing aid presets which well come to in a minute
the bulk of the hearing access profile lists mandatory combinations of bap and cap
features which are required for different product iterations whilst many are obvious such as
setting the csis size characteristic to for a pair of hearing aids they ensure that any products
claiming support for the profile will contain the same features and be interoperable this is
essentially the point of bluetooth le audio top level profiles ensuring that interoperability
is assured for specific use cases by clearly specifying which underlying profiles services and
features must be present
there are limitations every hearing aid must be able to receive a unicast or br oadcast audio
stream that complies to the bap mandated requirements but does not need to receive one
which has been encoded with other optional qos settings it must accept volume control
commands from any device which supports the harc role which could be a stand alone
remote control or an application on a phone for the first time this means that hearing aid
accessories will be globally interoperable with any make of hearing aid
all hearing aids need to support the ringtone conversational and media context type s
which mean that they will all support incoming phone calls however they do not need to
support call control or return a voice stream when in a phone call thats a practical decision
as many hearing aids locate their microphone s for best pickup of sound around the user rather
than the wearers voice so it will often be better for a user to use the phones microphone
when in a call these are limitations which manufacturers will need to convey in their product
marketing
hap a nd has introduce a new concept which is support for presets presets are proprietary
audio processing configurations which hearing aid manufacturers include to optimise the
sound fed to the ear typically they adjust the processing to c ope with different environments
such as restaurants shops office home etc hap and has dont attempt to standardi se
these settings but provide a numbering scheme which manufacturers can map to their specific
implementation users can then select a specific preset by its number or cycle through them
it includes the ability to add friendly names so that an application can display the current
presets and other available presets it also supports dynamic presets where the availability of
section haps the hearing access profile and service
a preset may change depending on the status of the hearing aid for example a preset that
was optimised for reception of a telecoil signal would not be available when there is no telecoil
loop available presets are currently a feature which is specific to heari ng aids for more
information on them refer to the haps specifications
within the preset feature of has there is an interesting option which is likely to expand into
other profiles this is the ability to use a non bluetooth radio to relay a command from one
hearing aid to the other without the need for a commander to institute a procedure to other
set members based on a notification from one of them this is the synchronized locally