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need a gain if the device is capable it can simultaneously transmit streams with
higher sampling rates
section personal communication
the bluetooth sig plans to promote these guidelines in a similar manner to the way that the
wifi alliance has for publicly accessible wi fi access points t o help encourage
interoperability and confidence in the new audio sharing ecosystem
personal communication
whilst all of the broadcast applications described above can be accessed by individuals most
are likely to be used by groups of people and the int erface designs for them should be designed
with that in mind however there are applications which will be predominantly designed for
individual conversations once again these mimic many of the telecoil applications where a
small inductive loop is us ed to provide an audio feed for a single person these are typically
found at ticket desks taxis banks supermarket checkouts and hotel receptions these use a
static microphone to pick up the hearing aid wearers voice and a telecoil loop to return a n
audio stream from the other person to their hearing aid what is important in this application
is that the broadcast audio stream is private and never mixed up with another one nearby
while the conversation can always be heard by someone standing near by you do not want it
to be picked up by someone several metres away nor do you want the wrong stream to be
picked up so once again encryption and authentication are necessary
the techniques to find the broadcast source and to obtain the broadcast code are the same
as the ones described above but these particular use cases are generating interest in developing
an industry wide method to connect
tap hear making it simple
although nothing has yet been specified i ndustry i nterest is focused on the use of nfc to
provide a simple tap hear interface with the user tapping their phone or any commander
device onto a touchpad that contact will transfer the information that the hearing aids or
earbuds need to find the corr ect broadcast source and the appropriate broadcastcode as
soon as that is done the conversation can begin with the broadcastcode and big details
remaining static for the duration of the session it provides an attractive and simple user
experience and is applicable for all types of personal connection whether at a supermarket
checkout accessing the right conference meeting room or even connecting to the broadcast
stream in a theatre or cinema it is equally applicable to a udio sharing where friends would
just need to tap your phone to share music or to gain access to a private tv
wearables take control
although the bluetooth classic audio profiles allow for remote control on separate devices
there has been very little u se of these capabilities these have mainly been limited to carkit
functionality with an occasional foray into wearable devices with bluetooth le audio that
is likely to change there are a number of reasons for that
one of the main drivers for re mote controls is the continuing growth of earbuds as the
hearing aid industry discovered several decades ago adding user controls to something as small
chapter bluetooth le audio applications
as an earbud or hearing aid is not easy either for the manufacturers or the customer as a
result customers have been encouraged to use phone apps to control their audio however
constantly taking your phone out and opening the appropriate app is far from being the best
user experience the control features within the bluetooth le audio specificati ons make it
much easier to incorporate remote controls into other devices and to have as many of them
as a user wants these are low power products which can easily run off coin cells so can be
low cost and will be interoperable allowing any bluetooth product to integrate the features
as a result we expect to see a trend for wearable devices to implement this functionality
whether thats wristband smart watch glasses or clothing it may be a feature which increases
the usefulness of wearables for many users bringing life back to what has become a relatively
moribund product sector
battery boxes become more important than phones
its worth adding a few words on the humble battery charger box for earbuds its a necessary
accessory which was deve loped alongside earbuds to give the m the semblance of a useable
battery life the first generation of earbuds mostly struggled to run for an hour before they
needed recharging the battery box was a neat idea both to hold them safely but also to
rechar ge them constantly giving users the perception that they would run for a day since
those early products the battery life of earbuds has improved significantly with models
claiming up to hours of continuous music albeit with processing features lik e automatic
noise cancelling turned off bluetooth le audio will increase th e basic battery life although
manufacturers will probably take the opportunity to add more features which suck up power
regardless of that battery boxes are here to stay not least because they provide a very
important function alongside their charging capability which is a container to stop you losing
your earbuds
many battery boxes already contain a bluetooth chip to help with pairing and to provide an
audio stream in situations where one doesnt exist such as on an aircraft here the battery
box can plug into the mm jack provided by the aircrafts personal entertainment system
transmitting sound to your earbuds bluetooth le audio s lower power and lower latency
make it the ideal choice to replace bluetooth classic audio in these applications however
the battery box is also ideal for many remote control functions unlike earbuds and hearing
aids it is big enough for buttons so is ideal as an easily accessible volume controller it can
also act as a broadcast assistant scanning for available broadcasts in general it will provide
a much faster and easier interface than getting your phone out and opening an app because
the bluetooth le audio control functionality is always there as buttons
in designing bluetooth le audio controller s it is a useful exercise to think about how you
would implement them on a battery box its such an easy thing for users to interact with but
because of its inherent simplicity its often overlooked it wont necessarily be the best d evice
to implement them on but its accessibility and small size fitting into pockets that wont hold
a phone make it an attractive alternative
section market development and notes for developers
as designers find ways to turn small devices like this into compelling user interfaces we will
probably fi nd that we spend less time interacting with our phone as earbuds get better at
mixing bluetooth audio streams with ambient sound and conversations which audio
processing can enhance we will probably spend more time wearing our earbuds talking to all
sorts of things around us and interacting with audio phones are not going to go away any
time soon although we have already passed peak smartphone but bluetooth le audio may
drive the applications that lead us to whatever comes next
market development and notes for developers
theres a simplistic view that broadcast infrastructure in buildings theatres hotels and cafes
will happen because the cost of a bluetooth le audio broadcast devices will be cheap so
people will buy them from ebay and amazon p lug them in to their existing audio system and
put up a bluetooth audio sharing sign that will certainly happen its what happened in the
early days of wi fi when venue owners did exactly that with bluetooth le audio it should
be easier as you don t need to install an internet connection you just need a cable to attach it
to your existing audio system
however with wi fi many venue owners discovered that it was easier to work with a service
provider who could install it manage it and provide s upport for the venue and the customers
the same model is likely to appear with bluetooth le audio i suspect that we will see wi
fi access point providers selling access points which include bluetooth le audio so that a