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LeAudio

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as the central device for much of our communication may wane in turn as voice becomes
natural as a means of command new applications may develop which use audio as their
primary interface with no need to interact with a screen there is a long way to go but
smartphones were never going to be the final step in the evolution of our personal
communications some other product will emerge as smartphones did themselves the new
capabilities that blueto oth le audio brings to the equation allowing greater ubiquity for voice
and audio may hasten that change
the ability to use multiple commanders means that wearable devices gain increased utility
whilst not all of that will relate to audio it increas es the reasons for purchasing and wearing
them that will help the wearables industry as a whole which is still struggl ing to reach the
volume or customer interest that they had hoped for
all of these changes will take time some will happen earlier o thers later some may come in
implementations which fail to convince users but then get successfully reinvented a few years
later thats been the case for most new personal technologies what is clear is that they will
change the dynamics of the audi o ecosystem giving far more opportunity for audio
manufacturers to innovate and chip away at the de facto status of smartphones in this
chapter well explore some of the different scenarios for bluetooth le audio look at the
opportunities for new ways of presenting audio sharing services determine what is needed to
enable them and assess what this may mean both for phone design and for the design of
other products
the bluetooth le audio specifications will not by themselves transform the way we use
audio to be effective many parts of the industry hardware developers apps developers
service providers and ux designers need to understand the possibilities and take on board
how t o make t hese new audio experiences compelling letting users dis cover how audio can fit
chapter bluetoo th le audio applications
in with their lives in new ways and then build on that to deliver new ways of using audio
broadcast for all
there is no question that both users and venues who currently use telecoil will welcome the
advent of bluetooth le audio as the next step in hearing reinforcement the quality is
considerably higher and installation costs should be significantly lower f or hearing aid users
it promises a much wider range of places where they can connect for hearing reinforcement
for building owners and architects it should mean that hearing reinforcement becomes a
standard feature of new buildings its a sad fact t hat the lack of telecoil in many new buildings
has more to do with a lack of understanding from architects than the cost of the current
technology
this should all happen naturally as broadcast products become available helped by an
ongoing promotion of bluetooth le audio by the hearing aid industry however users will
need new hearing aids that contain bluetooth le audio to pick up these broadcasts currently
only a small percentage of hearing aids contain any form of nonproprietary bluetooth wirele ss
technology and it will take time for a critical mass of users to emerge compared to consumer
volumes the hearing aid market is relatively small it will probably take at least five years to
attain ten million users of new bluetooth le audio hearing aids not least because hearing
aids need medical approval before they can be sold which slows down time to market this
raises the interesting question of whether consumer products will drive the initial r ollout of
audio broadcast infrastructure whic h will benefit everyone regardless of whether they have
hearing loss
democratising sound reinforcement
today providers of public broadcasttelecoil services are thinking predominantly about
people wearing hearing aids when they design their products these services most commonly
replicate and reinforce an audio announcement with low latency very few people are thinking
about whether this will be relevant to people without hearing loss and how they can be
extended the likelihood is that many users o f earbuds and headphones would find them
beneficial if that is going to happen then most people certainly in the short term are likely
to find and select them using apps on their smartphones so the first step will be for the
phone operating systems to expose the information about these broadcasts allowing users to
select and listen to them in other words we need to see app interfaces which look something
like those in figure mimicking what is already done today for discovering and pairing to
wifi and bluetooth devices
section broadcast for all
figure simple user interface to find bluetooth le audio broadcasts
although this is a format that most users will be familiar with its still more difficult than it
needs to be the example of figure illustrates the fact that on e of the first applications
is likely to be in public transport many bus stops have announcement boards but unlike train
platforms dont make public audio announcements because they are intrusive on a street
national guidelines in many countries alre ady require telecoil to be incorporated in new public
infrastructure and are likely to include bluetooth le audio in their future recommendations
as these appear good transport apps should start to include support for the m so that travel
apps automati cally detect the presence of an appropriate audio stream and ask the user if they
wish to listen to it saving them the inconvenience of going into their bluetooth settings to
search for it
there are several tools within the bluetooth le audio specifications which help the
development of a good u ser experience for integrated applications looking back at the
chapters on broadcast there are a number of pieces of information which should be included
in the broadcast advertisements to help a scanning device filter and sort different broadcasts
these are
the local name ad type which provides the device name normally this would
be the primary item of information displayed in a list of available broadcast
transmitters
the programinfo ltv an ltv structure which includes information about the
content which is being broadcast its similar to the top level of information that is
included in a tvs electronic program guide eg the tv channel
the base which may contain further info rmation about the content including the
name of the content eg the specific program name for a tv broadcast as well as
the language of transmission
chapter bluetooth le audio applications
with this information applications which are scanning on behalf of your earbuds or hearing
aids can obtain a lot of information to direct them if they want to start embedding broadcast
audio into their user experience equally the providers of broadcast audio information need
to think carefully about how to use it and how best to support applications the primary use
of most public broadcast will remain sound reinforcement where the broadcast audio is
designed to be low latency so that it can be received and rendered alongside ambient audio
its now possible to include multiple languages for those announcements but they should be
scheduled so they dont conflict with an ambient announcement in another language
otherwise they will be more difficult to und erstand its a small but obvious nuance but one
of many that developers will need to learn
broadcast stream providers also need to think about the information they use to tag the
streams as you move from a bus stop onto a bus your application should track the loss of
the bus stop as a broadcast source and switch to the broadcast source on th e bus youre
travelling on in somewhere like london with a high density of buses its quite possible that