Datasets:
kkboy1
/
LeAudio

Dataset card Data Studio Files
xet
 Community
1
text
stringlengths
1
112
you may be next to another bus on the same route but travelling in the opposite direction so
an application should contain enough basic intellig ence to detect that it has connected to the
right transmitter as long as the local device names and programinfo values are sensibly
ascribed it should be straightforward to determine that however this needs service
providers application developers a nd equipment manufacturers to work together to give their
users the best experience
most public broadcast streams will be mono voice streams which can be adequately encoded
using the qos settings using very little airtime the messages are likely to be
infrequent in the example of a bus either the announcement of the arrival of a bus or when
youre on it an announcement of the next stop if your phone has sufficient resources a
travel app should be able to monitor the appropriate bis mixing it in to any other audio
stream at the point where it detects the bis contains an audio message and ignoring it when
there are only null packets
figure mixing broadcast announcements into an audio stream
section broadcast for all
figure shows the basic setup where a phone is running both a music streaming app and
a travel app which is monitoring the local broadcast transmitters for relevant audio
announcements figure shows how the phone would combine audio from t he different
sources into a single stream which is encoded and sent in a single cis it makes the point that
an initiator is free to mix whatever audio channels it wants to place in a stream to send to the
earbuds
figure mixing application specific audio streams into a cis
given that people are starting to leave their earbuds in for longer using the transparency mode
to hold conservations this is a useful way of receiving relevant announcements pa rticularly if
they are silent foreign language announcements
audio augmented reality the whisper in your ear
the example above of mixing broadcast travel announcements into other information
generated by a travel app is the entry point into using broadcast audio as an element of
augmented reality the initial promises of augmented reality and virtual reality have proven
to be rather disappointing with few successful applications outside spe cialised business ones
and products for stayathome gamers audio may offer a more acceptable entry step
particularly for everyday augmented reality
the advantage audio brings is that it is far less obtrusive its the little whisper in the ear that
helps you do whatever else youre doing with no need to purchase or wear what are often
inconvenient wearable tech products we are already seeing multi axis sensors incorporated
into earbuds which can detect your head position and hence know where your e looking
combine d with information from broadcast transmitters and spatially aware applications
these allow some innovative new audio applications where sound can start to merge into
your everyday experience without the need for any special ar or vr h ardware directions
can tell you which way to turn and where to look a lot of the underlying technology for
these already exists it is just waiting for the potential of bluetooth le audio to make it
possible
bringing silence back to coffee shops
the examples above show how existing telecoil applications can be expanded to a wider
audience and integrated into todays smartphone apps there is likely to be a parallel evolution
of broadcast infrastructure in new areas one that is getting a lot of a ttention is employing
broadcast to provide background music in cafes and restaurants
chapter bluetooth le audio applications
at some point in the past somebody though it was a good idea to equip most cafes bars and
restaurants with background music the design chic of the past decade has lar gely been to
remove any furnishings that act as noise absorbers making conversation increasingly difficult
and raising the background noise level that generates a positive feedback loop where
customers start talking more loudly so the staff turn the mu sic up resulting in customers
having to raise their voices and turning what should be an enjoyable experience into a far less
pleasant one restaurant reviews now routinely include a measure of noise to show whether
its possible to hold a conservation despite negative consumer feedback the music remains
it would be nice if bluetooth le audio could effect a change
parts of the hospitality industry believe that there is an obvious place for bluetooth le audio
to replace loudspeakers providing music for those who want to listen and reducing the noise
levels for those who want to talk
the addition of hardware can be extremely simple all it needs is a bluetooth le audio
broadcasting module fitted to the output of an existing audio system chip vendo rs are already
developing reference designs for units like this and within twelve months of the specifications
being adopted devices like this should be readily available for a relatively low price product
designers should make sure that they can be ea sily configured by the venue owners so that
they are easy for customers to discover
making audio universally available
this is where the public broadcast profile becomes important a commercial bluetooth le
audio transmitter should allow the selection o f any of the qos settings which are defined in
the bap specification bap table however not all acceptors will be able to decode all
of them resource constrained devices such as hearing aids which want to achieve the
greatest possible battery l ife will probably not support decoding for sampling rates above
khz so if a broadcast transmitter only supports a higher rate wearers will be unable to hear
the broadcast audio there are some simple solutions to this but they require broadcast d evice
manufacturers to implement them
the simplest approach is to confine transmission of music in a public space to the
qos setting if there is any background noise ie it is less that a perfect listening environment
most users are likely to find this satisfactory
section broadcast for all
sampling rate mono
airtime stereo airtime universally receivable
khz yes
khz no
khz no
note these figures are based on the low latency settings the khz sampling figures have a higher airtime
requirement as the configuration requires a rtn setting of rather than the value of which is used for the
and settings
table airtime requirements for different broadcast stream qos settings
table provides the data for this discussion g iven current marketing trends in the audio
industry its likely that many manufacturers will want to be able to promote their products as
khz audio quality which poses a dilemma if these transmitters support a stereo khz
stream yet still want to provide universal support they need to add at least a khz mono
stream if that were included within the same big it would take the airtime to because
although it uses less airtime every bis in a big is allocated the same timing parameters the
alternative is to transmit a second separate big for the khz mono stream where the
combined bigs would account for around of ai rtime but would require more advertising
resource if a broadcast transmitter uses wi fi to obtain its audio stream that is probably not