In Broadcast - April 2021 - 68

68

www.inbroadcast.com | Vol: 11 - Issue 4 | April 2021

InAudio

Optimised for IP

Intraplex Ascent from GatesAir

There are two main challenges
which GatesAir addresses with Audio
Over IP; those of scalability and lowlatency transport reliability. According
to VP of Engineering, Keyur Parikh,
software-centric solutions that can be
implemented on a cloud infrastructure
will address scalability.
The
AES67
standard,
along
with highly efficient compression
algorithms such as AAC-HE and Opus,
makes it possible to have a highly
scalable cloud solution, he says. For
transport reliability, incorporation
of SRT along with network diversity,
provides reliability, low-latency and
encryption for content distribution.
" Software-centric
solutions
enable customers to migrate to
public and private clouds, which
allow them to effectively scale their
audio contribution and distribution
platforms, " Parikh says. " One specific
use case with recent momentum is
adopting cloud-enabled distribution to
replace C-Band satellite distribution.
GatesAir is now working with several
large radio groups to engineer a
solution that will help them costeffectively scale the volume of
distribution. "

cont'd...

Last year the vendor introduced
Intraplex Ascent, a server-based
AoIP and media distribution
platform.
For
audio
applications,
a
single
instance of Ascent can
scale up to 32 channels
of
full-duplex
audio
supporting AES67 and AES3/
Analog channels. Ascent's
media gateway provides
a centralized distribution platform
to distribute audio and video to
large number of remote codecs. For
transport reliability, Ascent supports
Intraplex Dynamic Stream Splicing
(DSS) with network redundancy, along
with SRT protocol support. The cloudfriendly architecture and support for
reliable distribution functionalities
means that Intraplex Ascent addresses
the challenges of scalability and
reliability in a very cost-efficient
manner.
WorldCast
Systems
highlights
the increasing number of radio
broadcasters looking at a rejig of the
FM broadcast signal chain. This rejig
has been enabled as connectivity
improves between the studio and
the transmitter sites and the
types of bandwidth choices

are increasing with more satellite
(Starlink), cellular, fibre providers
coming online in more remote
locations.
" The fact that IP is
inherently multicast (or
multiple unicast on pubic IP)
has allowed broadcasters a
radical rethink on where the
building blocks of the FM
signal chain are located, "
says sales director Kevin
Campbell.
WorldCast
Systems
first developed an MPXComposite coding scheme
some years ago to allow
broadcasters to redesign
the FM signal chain,

SIP Opus Codec: Automatic link
negotiation for high quality audio over
IP transport from Barix

bringing the FM Processor and the RDS
Encoders down from the high sites and
into the studios.
Less hardware is one advantage.
One fat processor could distribute the
station's signature sound to multiple
sites using IP multicast / multiple
unicast, saving on capital cost. There's
also less maintenance cost and issues
as the big FM processors are cosseted
in the much less harsh environment of
a studio.

IQOYA TALK is a portable IP audio codec
dedicated to live remote broadcasting

Worldcast's new APTmpX algorithm applies a lossless
compression to the entire spectrum

However, not all broadcasters have
the 4.5Mbs bandwidth available to
transport one or multiple FM MPXComposite signals at 24Bit. " There
were
destructive
compression
methodologies on the market but

many broadcasters were not happy
about using this aggressive approach, "
says Campbell.
WorldCast stepped forward with a
couple of novel approaches to this
technical conundrum. In the first, it
limits the signal to just below the sub
bands at 64kHz, thereby reducing the
bandwidth to around 2Mbs. Secondly,
it has a new APTmpX algorithm which
applies a lossless compression to the
entire spectrum - reducing bandwidth
further to around 900kBits.
" Both these bandwidths reduced
MPX-Composite coding schemes are
not only non-destructive but protected
by our OMC (Over Modulation
Cancellation) algorithm to prevent
any possibility of overshoots, " says
Campbell. " Both can be transported
via our APT SureStream
algorithm to ensure robust
delivery over less than
perfect IP links. "
While VoIP protocol SIP
(Session Initiation Protocol)
allows for easy negotiation
between devices of multiple
vendors, Opus is an open
audio codec that maximises
quality for bandwidth with
interoperability. The combination
is the future of interoperability,
according to Barix.
" Many
broadcasters
need
a
customized solution to bridge
gaps between different technology
and devices, " says Reto Brader,
CEO. " Customisation to individual
requirements can be complex while
the installation date is coming
closer. Our standard request time for
adjustments at Barix for being live
in the field has been just over three
months. We expect such efficiency in
development of hard- and software
adaptations to individual
needs to grow even more. "
He
adds,
" The
combination of SIP and
Opus is exceptional. Firewall
configuration
becomes
simpler through the handshake
of SIPS (secured SIP). The
compression with Opus is the latest,
very robust technology advancement.
That versatility is unmet in one codec.
From the highest quality streaming to
low bandwidth usage in very remote
environments, Opus is configurable to
suit the needs of the end user. "
The SIP Opus Codec was initially
built for a large radio network
(iHeartRadio). Barix believed this
technology would benefit a much
wider range of radio stations. He says,
" We made the agreement to adapt


http://www.inbroadcast.com https://www.gatesair.com/products/transport/audio-contribution-distribution/intraplex-ip-link https://www.gatesair.com/products/transport/audio-contribution-distribution/intraplex-ip-link https://www.barix.com/sipopuscodec/ https://www.barix.com/sipopuscodec/ https://www.digigram.com/audio-over-ip/iqoya-talk-the-new-standard-for-portable-codecs/ https://www.digigram.com/audio-over-ip/iqoya-talk-the-new-standard-for-portable-codecs/ https://inbroadcast.com/news/worldcast-systems-launch-sfn-technology-for-fm https://www.digigram.com/audio-over-ip/iqoya-talk-the-new-standard-for-portable-codecs/

In Broadcast - April 2021

Table of Contents for the Digital Edition of In Broadcast - April 2021

Contents
In Broadcast - April 2021 - Intro
In Broadcast - April 2021 - Cover1
In Broadcast - April 2021 - Cover2
In Broadcast - April 2021 - Contents
In Broadcast - April 2021 - 4
In Broadcast - April 2021 - 5
In Broadcast - April 2021 - 6
In Broadcast - April 2021 - 7
In Broadcast - April 2021 - 8
In Broadcast - April 2021 - 9
In Broadcast - April 2021 - 10
In Broadcast - April 2021 - 11
In Broadcast - April 2021 - 12
In Broadcast - April 2021 - 13
In Broadcast - April 2021 - 14
In Broadcast - April 2021 - 15
In Broadcast - April 2021 - 16
In Broadcast - April 2021 - 17
In Broadcast - April 2021 - 18
In Broadcast - April 2021 - 19
In Broadcast - April 2021 - 20
In Broadcast - April 2021 - 21
In Broadcast - April 2021 - 22
In Broadcast - April 2021 - 23
In Broadcast - April 2021 - 24
In Broadcast - April 2021 - 25
In Broadcast - April 2021 - 26
In Broadcast - April 2021 - 27
In Broadcast - April 2021 - 28
In Broadcast - April 2021 - 29
In Broadcast - April 2021 - 30
In Broadcast - April 2021 - 31
In Broadcast - April 2021 - 32
In Broadcast - April 2021 - 33
In Broadcast - April 2021 - 34
In Broadcast - April 2021 - 35
In Broadcast - April 2021 - 36
In Broadcast - April 2021 - 37
In Broadcast - April 2021 - 38
In Broadcast - April 2021 - 39
In Broadcast - April 2021 - 40
In Broadcast - April 2021 - 41
In Broadcast - April 2021 - 42
In Broadcast - April 2021 - 43
In Broadcast - April 2021 - 44
In Broadcast - April 2021 - 45
In Broadcast - April 2021 - 46
In Broadcast - April 2021 - 47
In Broadcast - April 2021 - 48
In Broadcast - April 2021 - 49
In Broadcast - April 2021 - 50
In Broadcast - April 2021 - 51
In Broadcast - April 2021 - 52
In Broadcast - April 2021 - 53
In Broadcast - April 2021 - 54
In Broadcast - April 2021 - 55
In Broadcast - April 2021 - 56
In Broadcast - April 2021 - 57
In Broadcast - April 2021 - 58
In Broadcast - April 2021 - 59
In Broadcast - April 2021 - 60
In Broadcast - April 2021 - 61
In Broadcast - April 2021 - 62
In Broadcast - April 2021 - 63
In Broadcast - April 2021 - 64
In Broadcast - April 2021 - 65
In Broadcast - April 2021 - 66
In Broadcast - April 2021 - 67
In Broadcast - April 2021 - 68
In Broadcast - April 2021 - 69
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In Broadcast - April 2021 - 81
In Broadcast - April 2021 - 82
In Broadcast - April 2021 - Cover4
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