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routing technologies appeared
chapter the bluetooth le audio architecture
multiple devices which are not configured as members of a coordinated set can still be used
in gaf as an ad hoc set in this case they need to be individually configured by the
application it means that they do not benefit from the locking f eature of csis which could
result in different connections to members of the ad hoc set
cap the common audio profile introduces the commander role which brings together
the features which can be used for remot e control of bluetooth le audio streams the
commander is a major change from anything weve seen in previous bluetooth specifications
allowing the design of ubiquitous distributed remote control for audio it is particularly useful
for encrypted broad casts where it provides a way to convert broadcast transmissions into a
private listening experience well explore that in more detail in chapter
cap uses csis and csip to tie devices together and ensure that procedures are applied to
both it also introduces the concept of context type s and content control ids which allow
applications to make decisions about stream setup and control based on a knowledge of the
controlling devices the use cases for the audio data and which applications are available this
is used to inform transitions between different streams whether that is prompted by different
applications on a device or a request from a different device for an audio connection a lot of
this functionality is based on new concepts which have b een introduced in bluetooth le
audio these are explained in more detail in chapter
top level profiles
finally on top of the gaf specifications we have top level profiles which provide additional
requirements for specific audio use cases the first of these are the hearing access profile
and service hap and has which cover applications for the hearing aid ecosystem the
telephony and media audio profile tmap which specif ies the use of higher quality codec
settings and more complex media and telephony control and the public broadcast profile
pbp which helps users select globally interoperable broadcast streams public broadcast
profile is anomalous in having no accompanying service but thats a consequence of the nature
of broadcasts where there is no connection for any client server interaction
the low complexity communications codec lc
although not a part of the gaf the bluetooth le audio releases include a new efficient
codec called lc which is the mandated codec for bluetooth le audio streams this
provides excellent performance for telephony speech wideband and super wideband spe ech
and high quality audio and is the mandated codec within bap every bluetooth le audio
product has to support the lc codec to ensure interoperability but additional and proprietary
codecs can be added if manufacturers require lc encodes audio into single streams so
there is a corresponding minimalist tmas specification which is included within the tmap
specification
section talking about bluetooth le audio
stereo is encoded as separate left and right streams this means that gaf can configure a
unicast stream to an earbud to carry only the audio which that earbud requires a broadcast
transmitter sending music would normally include bot h left and right audio streams in its
broadcast individual devices would only need to receive and decode the data relevant to the
stream which they want to render
talking about bluetooth le audio
writing over twenty specification s has generated a lot of new abbreviations including ones
for the name of each individual specification over time the working groups have come up
with different ways of referring to these sometimes as acronyms where you pronounce them
as words sometimes as initialisms w here you just pronounce the letters and occasionally as
a mix of both the following table captures the current pronunciations of the most commonly
used ones as a help to anyone talking about bluetooth le audio
acronyms
the following abbreviations are all pronounced as words or a combination of letter and word
abbreviation meaning pronunciation
aics audio input control service aches as in aches and pains
ase audio stream endpoint ase rhymes with case
att attribute protocol at
bap basic audio profile bap rhymes with tap
baps the set of bap ascs bass and pacs baps
base broadcast audio source endpoint base rhymes with case
bass broadcast audio scan service rhymes with mass not mace
big broadcast isochronous group big
bis broadcast isochronous stream biss
cap common audio profile cap rhymes with tap
cas common audio service cas rhymes with mass
cig connected isochronous group sig
cis connected isochronous stream sis
csip coordinated set identification profile see sip
csis coordinated set identification service see sis
csips the set of csip and csis see sips
eatt enhanced att ee at
gaf generic audio framework gaffe
gap generic access profile gap rhymes with tap
gatt generic attribute profile gat rhymes with cat
hap hearing access profile hap rhymes with tap
harc hearing aid remote controller hark
chapter the bluetooth le audio architecture
abbreviation meaning pronunciation
has hearing access service hass rhymes with mass
hauc hearing aid unicast client hawk
inap immediate need for audio related
peripheral eye nap
lcap logical link control and adaptation
protocol el two cap
micp microphone control profile mick pee
mics microphone control service mick ess
pac published audio capabilities pack
pacs published audio capabilities service packs
past periodic advertising sync transfer past rhymes with mast
pbas public broadcast audio stream
announcement pee bass bass rhymes with
mass
phy physical layer fy rhymes with fly
qos quality of service kwos
rap ready for audio related peripheral rap
sirk set identity resolving key sirk like the first syllable of
circus
tmap telephony and media audio profile tee map