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codec and released twenty three profile and service specifications along with accompanying
documentation and assigned numbers documents which between them contain a round
new pages
for anyone not involved with that eight year journey its a pretty formidable set of documents
to start reading the purpose of this book i s to try and put those specifications into context
adding some of the history and rationale behind th em to help readers understand how the
different parts interconnect ive also provided some background information on the market
and whats in a hearabl e to help readers rel ate the specification to actual products in the
chapters which delve into detail ive included references to the specific part of the
specifications using their abbreviated name and section number eg bap for section
of the basic audio profile ive tried to limit the number of references so that they dont
get in the way of the text the glossaries and concordances in chapter should also help
developers navigate their way around the documents
i wanted to get this information out as quickly as possible so for the first time ive reso rted
to self publishing avoiding the lengthy delays ive experienced with publishing houses in the
past i have to thank amazon for the ability to do that so easily if you find this book helpful
id really appreciate it if you could write a review and tell your friends if you think there are
omissions or something is unclear please drop me an email at nickwiforecom the
advantage of selfpublishing is that i can update the book far more readily than with a normal
book ill also try and answer comments and publish corrections at the books website at
wwwbleaudiocom
all of us involved in the specification development think that bluetooth le audio gives us
the tools to develop exciting new audio products and applications i hope that this book helps
to explain those new concepts and inspire s you to develop new ideas if so the eight years
that so many of us have spent working on it will have been time well spent
the bulk of this book will explain how these new specifications work how they fit together
and what you can do with them but well also take a glimpse at the future in the final chapter
before jumping into the specifications its useful to understand where we are today and what
goes into a hearable device to help understand how everything fits together thats the
purpose of chapter if you want to get straight to the detail skip to chapter
a few of the bluetooth le audio specifications are not yet adopted so ive relied on pre
publication drafts which the bluetooth sig has made public the versions us ed for this
edition are listed in chapter
chapter the background and heritage
chapter the background and heritage
since it was first announced in bluetooth technology has arguably grown to be the
most successful two way wireless standard in history in the wireless standards business
success is normally counted as the number of chips which are sold each year on that basis
bluetooth is the winner with around billion chip s hipments in wifi is close behind
with billion followed by billion for all variants of gsm and gpp phone s and a mere
million for dect
however for much of its history only a small number of those chips were actually used
when bluetooth technology was f irst proposed its developers identified four main use cases
three of them were audio applications focussing on simple telephony functions
a straightforward wireless headset that was just an extension of your phone defined
in the headset profile
an intercom specification for use around the house and in business and
a new technology for cordless telephony hoping to replace the proprietary analogue
standards used in the us and the emerging dect standard within europe its
intent was to combine the functions of cordless and cellular in a single phone
the fourth use case was called dial up networking or dun which provided a means to
connect your laptop to your gsm phone using the phone as a modem to give you internet
access wherever you were in the world as is often the case with new technology standards
none of those four use cases really took off despite some initial enthusiasm from pc and
phone companies cordless telephony and intercom failed because they potentiall y took
revenue away from mobile phone operators dial up networking worked but at that point
mobile phone tariffs for data were expensive which encouraged people to use the new wi fi
standard instead headsets started to sell but unless you were a tax i driver you werent likely
to buy one it became clear that these particular use cases probably werent the ones that were
going to generate scale in the market so the bluetooth sig started work on a host of other
features such as printing and object transfer none of which attracted much more interest
from consumers
what happened next is what all standards bodies hope for government regulations appeared
which gave bluetooth technology a better reason to exist
at the end of the s global mobile phone usage exploded as the falling price of both
phones and phone contracts changed them from a business tool to a consumer essential
mobile phone operators started to become high street names growing to become substantial
businesses
section the hearing aid legacy
figure growth of global mobile phone subscription s
as phone usage increased so did a concern about where they were used as more and more
road accidents were reported where drivers had been holding t heir phones and become
distracted legislators around the world started to propose bans on the use of mobile phones
whilst driving for both the phone industry and the mobile operators this was a potential
disaster in the us it was reported that almos t a third of mobile subscription revenue which
at that time was based on the number and length of phone calls came from calls made whilst
driving it was a golden egg that the industry could not afford to lose to save that income
they proposed a comp romise to the legislators which is that safety could be restored if the
driver didnt need to hold their phone instead the phone call could be taken using a hands
free solution either built into the car itself or by using a bluetooth wireless headset
that was the spur that bluetooth technology needed with the new safety legislation coming
into effect p hone manufacturers started putting bluetooth into more and mo re of their phone
models rather than just the top end ones the automotive industry began integrating
bluetooth technology into cars and worked with the bluetooth sig to develop the hands
free profile for that use case it was a turning point for blueto oth technology in only
around of mobile phones were sold which contained a bluetooth chip almost all top
end phones the following year it doubled t he number was to grow every year as shown in
figure by two thirds of all new mobile phones contained a bluetooth chip
chapter the background and heritage
figure percentage of mobile phones containing a bluetooth technology chip
very few of th ose chips were actually used for the purposes that were intended thats
obvious as only around million headsets were sold in the same year and that number didnt
grow significantly in the following years but it was the start of a free ride that saw
million bluetooth chips ship in those volumes brought competition and manufacturing
efficiencies pushing the price down and starting a virtuous circle where the incremental cost
of adding bluetooth technology was negligible at least in terms of hardware the challenge