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Worldcast Systems - Radio & TV Broadcast Solutions


APT is over 30 years of expertise delivering exceptional audio quality on a solid, reliable platform. Hundreds of prestigious radios and broadcasters like the BBC World Service, NHK in Japan or RTL in France trust us to transport their audio streams during outdoor broadcasts or between their studio and broadcasting sites such as the Eiffel Tower. 

In addition to customers in the broadcast field, we also serve the Professional Audio community and other businesses in need of a top quality broadcast solution. Our current range of IP audio codecs and our remote solution for live audio/video streaming continue to lead the field with the same level of commitment to quality, reliability and innovation we have always shown.


Why Choose APT?

Audio Quality Picto

Audio Quality

The highest signal fidelity, which we established from the beginning with Enhanced aptX. Protect the fidelity 
of your content and avoid listener fatigue and tune out!

Reliability Picto

Reliability & Latency

As the Low-Delay Company, we have redefined transmission latency and all APT products convey this ethos. With SureStream, the Internet is evolving into a highly reliable low-delay network.

Savings Picto


APT products save you money. 
SureStream, Enhanced aptX and Composite/MPX transmission constitute an eco-system that provides highly available and high quality audio distribution outside of expensive transmission paths.


They Trust Us

RDC logo
Globosat logo
Bloomberg radio logo
Stingray logo
LankaCom logo
Kordia logo
MediaWorks logo
Telstra logo
Nec logo
AMS Radio solutions logo

Our Experts

APT is specialized in the design and manufacture of low latency / high-quality Audio, MPX and Video over IP - primarily for the broadcast market. Based at our codec centre of excellence in Belfast, the team is underpinned with highly skilled and experienced designers and is supplemented by our excellent technical support, product management and sales & marketing team.

APT uses high-availability design & test and continuous improvement strategies to deliver products for 24/7 use.


"As a member of APT since 2008, I have R&D Manager responsibility for the APT range of IP codecs and transport hardware and software - managing schedules, people and resources to deliver new technology to market. Prior to APT I led a team that designed embedded systems for medical devices and have an in-depth knowledge of regulatory systems & quality control."

Ken Kearney
Deputy Group Tech Strategy

Founder of the Open Audio Network (OAN) in the 1990s and expert in WorldNet Oslo at APT, Hartmut joined WorldCast Systems in 2005.  As the Audio codecs and IP network expert, he was the driving force behind the innovative APT SureStream Technology. Hartmut plays a significant role in the development of IP codecs and the alignment of sales strategy.

Hartmut Foerster
APT Product Manager / 
IP Application Engineer

With APT since 2003, Kevin has held many sales & management roles. Key moments include strategic wins for APT with the nationwide APT roll out in Malaysia & the high kudos audio networking projects for the NBA and MLB in the USA. Today, Kevin contributes to the strategic direction & marketing of the APT brand and also represents the entire WorldCast portfolio.

Kevin Campbell
APT Sales Director


Audio / Video
Contribution & Distribution


APT codecs offer the reliability, quality, and redundancy required by broadcasters for applications such as Studio-Transmitter links, studio networking and remote broadcasting/OBs. With both stereo and multi-channel audio platforms available, APT units can be deployed as a simple STL, a large-scale broadcast audio network or an audio distribution installation for commentary or in-store music.

With SureStream, we have extended our contribution/distribution expertise to include low latency, high quality video transmission from the field to the studio.


Remote broadcasting

Remote studio codecs

Studio to transmitter link (STL)

Secure IP transport

Audio contribution and distribution

Want All The Details on Audio Over IP?
Download the APT Guide to AoIP

The Essential Guide to Audio over IP for broadcasters

Bringing innovative solutions that enable drop-out free, reliable, low latency audio/video contribution and distribution. 


APT Highlights & Innovations


Explore The APT Product Line




IP Transport


Secure IP Transport



Synchronized IP Transport



MPXoIP Transport




We'd love to hear about your project

Contact us for any of your inquiries. Our Sales team is here to assist you with projects, questions on our products, or to find a local distributor. 

FOR TECHNICAL SUPPORT, please go to the support page to submit your request. The below form is for new inquiries only.