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LeAudio

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would put their tv into a bluetooth audio s haring mode which would ideally be a button
on their tv remote control not a menu item buried many layers down on the tv that
would activate the advertising train a ssociated with the broadcast stream which would provide
a method for the friend to obtain the broadcastcode
figure an example of how to add a friend to a tv broadcast
the method of obtaining the broadcastcode is not described in the bluetooth le audio
specifications as it is out of scope it could be discovered by displaying a number on the tv
screen for a user to enter into a phone app displaying a qr code or the use of nfc or
another proximity technology the market will probably agree on a standard option in the
near future
it is expected that broadcastcode values would be refreshed at the end of each sess ion to
ensure ongoing privacy in practice that is likely to happen automatically at each power down
bonded users would be unaffected as they would automatically be issued with the new value
each time they connect
hotels
anyone who has eve r been dist urbed during their stay in a hotel by the tv in the neighbouring
room being far too loud will welcome the advent of bluetooth le audio in tvs allowing the
occupants to use them silently its an ideal application but carries the same problem of
bluetoot h transmi ssions penetrating through walls floors and ceilings exposing what you are
watching to all of your neighbours
the same approach can be used as in personal tvs where a user is given the broadcastcode
whenever they want to connect equally the hotel could rely on a user having a general
purpose broadcast scanning app which lets them enter a pincode from the tv or scan a qr
code with their phone acting as a commander for their earbuds although these work they
are cumbersome and dont gi ve a particularly smooth user experience a more effective option
section phones and broadcast
would be to incorporate the broadcastcode provision into the hotel app so that as soon as
someone check s in their phone would be provided with the correct information to access the
tv fr om that app with their personal broadcastcode static for the duration of their stay
thats a fairly simple extension of the tv management system s which are already integrated
in most hotel tvs
phones and broadcast
in the early days of bluetooth le audio development broadcast was mainly seen as an
infrastructure application broadcasting to large numbers of people as the potential of the
technology became better understood there was growing excitement about what it offered for
smartphones what excited people most was the ability to share music on their phone with
their friends
the use case is a simple one it has been around since we first started storing music in personal
devices back in the days of sonys original walkman youd see pairs of people sharing their
earbuds to listen together to the music as weve progressed from portable music players to
streaming music on our smartphones the technology for sharing has not advanced in
contrast its becom e more difficult with the removal of the mm audio jack from
smartphones as the simple sharing of wired earbuds is no longer possible with many handsets
bluetooth le audio broadcast solves that problem if youre listening to your favourite music
and your friends come along you can ask them to join transition from a unicast stream or
from an adp stream we dont know what underlying technology will be used to a
broadcast stream that sets your phone up as a broadcast source which your friends ca n find
unless you want to be a public broadcaster your application will almost certainly want to
encrypt your audio so you r phone application needs to distribute the broadcastcode this
can be accomplished through a short term pairing without a requ irement to bond that has
the advantage that your friends phone will notify yours once it acquires the broadcast stream
your phone can then stop transmitting the advertising set so that nobody else is aware of
your broadcasts if other friends want t o join in you just repeat the process at any point in
the process your friends can leave once they have all left your phone will probably revert
back to unicast as the acknowledged packets in cises means it is more power efficient for an
initiator a broadcast transmitter has to transmit every possible retransmission subevent
equally any of your friends can take the role of broadcaster to share their favourite music
its a process which can continue for as long as any of them want as applicat ions develop
we may find ways to make swapping the broadcaster within a group even more seamless
in some cases the stream doesnt need to be encrypted anyone wanting to set up an ad hoc
silent disco just needs to start broadcasting
phone s can even take advantage of bluetooth le audio without being phones many people
with hearing loss like to use table microphones to help pick up voices in a meeting or around
chapter bluetooth le audio applications
the dinner table once your phone has bluetooth le audio an application could set it up as
a private broadcaster broadcasting its microphone pickup to everyone else around the table
it uses no cellular functionality but acts as a local community microphone
audio sharing
all of these use cases have the same thing in common theyre evolving the telecoil
experience which was a hearing aid only experience to everybody who own s a bluetooth le
hearable whether thats a hearing aid headphone set of earbuds or even a portable speaker
thats a new concept for the va st majority of people the bluetooth sig working with
hearing loss use r groups as well as hearing aid and consumer hearables manufacturers is
developing guidelines for manufacturers and venues to promote the universal nature of
broadcast under the name audio sharing to help encourage its uptake and ensure
interoperability for all users
the interoperability issue is an important one for broadcasts as there are two conflicting
categories of devices
hearing aids and resource constrained hearables gene rally supporting the hearing
access profile with the ability to support only the khz and khz sampling rates
for lc and
consumer devices which may want to use the highest lc sampling rates of
khz
to cope with this discrepancy and ensure the opti mum experience for all users the audio
sharing guidance separates broadcast transmitters into two categories public and personal
public broadcast transmitters are ones which everyone should be able to access
these must transmit a stream at the lower sampling rates of either khz or khz
supporting the public broadcast profile to inform users where and when those
audio streams are available a user detecting the public broadcast service uuid
will know that they can synchronise to that stream if t hey have the resources
public devices can also transmit higher quality streams at the same time
personal broadcast transmitters are devices like tvs phones pcs and tablets the
audio sharing guidelines recognise that the user may normally prefer to re ceive a
higher quality stream which would not be universally interoperable however
when a user selects an audio sharing compliant broadcast mode on their device
such as when a friend asks to access your tv or listen to your music stream it must
be possible to configure it to a universal setting which if selected would broadcast
a khz or khz sampled pbp compliant audio stream so that any device could
pick it up it is up to the user to ask the other stream recipients which option they