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APT IP Codec


The APT IP Codec is a cutting-edge, professional IP stereo codec geared up with unique, market-leading technology to provide next generation broadcast performance. Innovative and feature-packed, the APT IP Codec elevates the quality of reliable, cost-effective, and accurate temporal IP audio transmission to a level never before achieved. 

The proven SureStream redundancy and distributed intelligence of ScriptEasy is extended by the new compression format APTmpX for composite/MPX signals and the highly precise synchronization of IP streams with APT SynchroStream.

The APT IP Codec is perfectly equipped for individual FM feed as well as multi- and single-frequency broadcasting. It is suitable for mission critical applications and provides extensive control and monitoring functions to manage your audio, data and network conditions, as well as other equipment located at the transmitter site.

With the APT IP Codec, you know you will enjoy the rock-solid performance upon which APT has earned the trust of countless broadcasters worldwide.  


Current Version: 4.0.11


Product Benefits

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IP Transport

APT IP CODECS migrate the advantages of a synchronous connection to the IP world. With SureStream, packet losses are compensated, and latency fluctuations are eliminated by SynchroStream or the NTP-based Time Alignment. The enhanced NAT traversal mode overcomes barriers and IP packets reliably reach their specified destinations. 

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Pristine Audio Quality & Performance

Highest signal fidelity and lowest coding delay, which we established from the beginning with Enhanced aptX, are transferred to composite/MPX transmissions with the new APTmpX algorithm.

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Maximize Your
Cost Savings

APT products save you money. SureStream, Enhanced aptX, and APTmpX for low bitrate composite/MPX transmissions constitute an ecosystem that provides highly available and high-quality audio distribution outside of expensive transmission paths.


Technology Highlights


+10 Years Experience: Our team of engineers has extensive experience optimizing our algorithm for redundant streaming, making SureStream synonymous with reliable transmission in lossy IP networks.

Low Latency - Low Costs: SureStream enables the broadcaster to turn imperfect, but much cheaper services, into true broadcast-grade, low-latency IP connections.

Scalability and Flexibility: SureStream is the most flexible and scalable solution for content transmission protection, able to combine multiple paths from any combination of MPLS, Satellite, Microwave, xDSL and/or Cellular (4G/5G), creating a unified super robust connection to get your audio from point A to B. 

More on Surestream


Stable Latency: The GPS-based SynchroStream eliminates variable latencies of an IP network within unprecedented narrow limits. For program transmissions, a temporal synchronized connection appears like a synchronous link.

Complete Control Over Target Latency: SynchroStream requires a single setting on the IP Encoder to define the target latency to each Decoder at a transmitter site. Only one setting is required, and all Decoders are synchronized; accurate and stable to the millisecond. Fine-tuning is done at the decoder(s) in the array.

Synchronized FM Modulation: Temporal fine-tuning is the key to optimal geographic positioning of overlapping modulations of FM carriers. SynchroStream enables modulation control with the uniquely fine granularity of < 50 meters in terrain.

More on SynchroStream


Compressed Composite/MPX: APTmpX is the world’s first and only non-perceptual MPX/composite algorithm to save network bandwidth. It protects the sonic signature generated by the station’s sound processor settings.

Low Bitrate, Low Delay: An APTmpX sample is decodable on its own. Packet losses in the network have as little effect as those of base-band audio samples. Low delay transmission is inherent and with a bandwidth requirement of <300, <400, <600 or < 900 kbps, non-dedicated IP connections can be used.

More on APTmpX


Advanced Communication Solutions

The APT IP Codec is accompanied with a range of monitoring, 
management, and control solutions.

APT IP codec graphic interface

Graphical user interface


Advanced telemetry

Kybio NMS

KYBIO cloud-based monitoring included with your Ecreso FM AiO Series (1-year SaaS subscription free of charge).

Activate Kybio on your product


AoIP Applications

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.


Remote studio codecs

Studio to transmitter link (STL)

Secure IP transport

APT AoIP application diagram

Technical Specifications In Brochure


Some Customer Stories

APT customer - German Voice Talent

German Voice Talent Relies on APT IP Codec For Audio Distribution

Oliver Schmitz - Germany

APT customer - Codec and Surestream

APT Codecs & SureStream Deliver Solid Audio over Poor Internet Connections from the heart of the African Jungle

John Pierce - Australia

APT customer - New York Broadcaster

New York broadcaster turned to APT IP after ISDN shutdown

Joe Curcio - USA


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.