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connected isochronous streams |
broadcast isochronous streams |
isoal the isochronous adaptation layer |
chapter lc latency and qos |
introduction |
codecs and l atency |
classic bluetooth codecs their strengths and limitations |
the lc codec |
lc latenc y |
quality of service qos |
audio quality |
multi channel lc audio |
additional codecs |
chapter cap and csips |
csips the coordinated set identification profile and service |
cap the common audio profile |
chapter setting up unicast audio streams |
pacs the published audio capabilities service |
ascs the audio stream control service |
bap the basic audio profile |
configuring an ase and a cig |
handling missing acceptors |
preconfiguring cises |
who s in charge |
chapter setting up and using broadcast audio streams |
setting up a broadcast source |
starting a broadcast audio stream |
receiving broadcast audio streams |
the broadcast reception user experience |
bass the broadcast audio scan service |
commanders |
broadcastcode s |
receiving broadcast audio streams with a commander |
handovers between broadcast and unicast |
presentation delay setting values for broadcast |
chapter telephony and media control |
terminology and generic tbs and mcs features |
control topologies |
tbs an d ccp |
mcs and mcp |
chapter volume audio input and microphone control |
volume and input control |
volume control service |
volume offset control service |
audio input control service |
putting the volume controls together |
microphone control |
a codicil on terminology |
chapter top level bluetooth le audio profiles |
haps the hearing access profile and service |
tmap the telephony and media audio profile |
public broadcast profile |
chapter bluetooth le audio applications |
changing the way we acquire and consume audio |
broadcast for all |
tvs and broadcast |
phone s and broadcast |
audio sharing |
personal communication |
market development and notes for developers |
chapter glossary and concordances |
abbreviations and initialisms |
bluetooth le audio specifications |
procedures in bluetooth le audio |
bluetooth le audio characteristics |
bluetooth le audio terms |
introduction |
back in the spring of i remember sitting in a conference room in trondheim with |
representatives of the hearing aid industry as they explain ed to the bluetooth board of |
directors why they should commit time and effort to develop a bluetooth low energy |
specification that would support the streaming of audio id been asked by the hearing aid |
companies if i would chair the working group to devel op the new specifications everyone |
agreed it was a good idea and the two groups the bluetooth s pecial interest group s ig |
and ehima the hearing instrument manufacturers association the trade body |
representing the industry signed a memorandum of understanding to start work on a new |
specification to support audio over bluetooth low energy |
at the time we all thought it would be a fairly quick development hearing aids didnt need |
enormously high audio quality their main concern i n terms of bluetooth technology was to |
minimise power consumption what none of us had realised at the time was that the |
technology and use cases that had been developed by the hearing aid industry were quite a |
long way ahead of what the consumer audio ma rket was currently doing although t he long |
established telecoil system of inductive loops which allowed broadcast audio to reach multiple |
hearing aids only provided l imited quality audio the connection topologies they supported |
were more complex than t hose provided by the existing bluetooth adp and hfp audio |
profiles in addition the power management techniques and optimisations used in hearing |
aids gave battery lives that were an order of magnitude greater than those in similarly sized |
consumer products |
over the next twelve months as we developed functional requirements documents more and |
more of the traditional audio and silicon companies came to look at what we were doing and |
decid ed that many of the feature s that we were proposing for hearing aids were equally |
applicable to their markets in fact they appeared to solve many of the limitations that exist ed |
in the current bluetooth audio specif ications as a result the requirements list grew and the |
small hearing aid project evolved into the largest single specification development that the |
bluetooth sig has ever done culminating in what is now collectively known as bluetooth le |
audio |
its h ard to believe that the journey has taken eight years at the end of it we have produced |
two major revisions to the core specification introduced a completely new high efficiency |