Visiblu enables broadcasters to exploit the ubiquity of Internet Protocol, already the new backbone of the telecommunications industry.

Visiblu unifies sound card I/O and IP audio streaming protocols in an engine that runs under both Windows and Linux.

While EtherSound can take advantage of its ultra-low latency within the station, visiblu provides robust IP connectivity to complete the transmission chain.

Using Digigram's renown MPEG codecs or full PCM linear audio, software-based contribution or distribution systems can be deployed on demand. Add to that Digigram's professional audio mixing and effect processing, and you have a revolutionary toolkit for building a complete digital radio chain.

Visiblu Core

• Visiblu Core provides a distributed and self-discovering system of PCs or embedded platforms. The API allows integrated management of audio resources, routing, selection of codecs, and audio processing across a standard IP network
• Interoperability principles allowing large scale integration
• Deterministic and low latency audio sample throughput
• Secured network access to distributed platforms and resources
• Distributed graph-based interface showing multiplatform view
• File read and write management, including RF64
• Event trigger and control data management
• Open API for custom development of plug-ins and connectors
• Web-based licensing for customized option packages

• Visiblu Audio Engine provides transparent control and mixing of audio from any source: IP streams, soundcard I/O, EtherSound channels, and Ethernet file streams
• Native mono, stereo, or multichannel streams
• Audio effects: Time scaling, multiband EQ, compression, limiter, maximizer, expansion
• Synchronization to external clock : word clock, AES, with or without SRC
• 32-bit floating point mixing, gain, fade control
• Integration with DirectSound audio applications via Ulink virtual audio cable

• Fluid IP Stream Engine provides IP audio encoding and transport management
• RTP/UDP transport protocol in unicast and multicast modes
• Forward error correction : FEC scheme 3.2.2 on separate stream
• Automatic clock drift management
• Sample rate conversion (SRC)
• Multiple simultaneous encodings in host CPU
• Adjustable delay compensation and jitter management
• NTP-based and inter-device synchronization
• Stream mixing and re-synchronizing with different clock rates
• Control data, markers and metadata payload
• SDP/SAP/SIP description, stream signaling and session management

• PCM linear 16/24
• ISO MPEG-1/2 L1, L2, L3
• ITU G.711/721/722/723/726
• MPEG-4 AAC, MPEG-4 AAC-LD
• MPEG-4 HE-AACv2

• Program syndication and content distribution
• Remote field contribution with audio mixer
• Bidirectional studio to studio or studio to transmitter links
• Automated IP audio feed recording, logging, archiving
• Intercom, VoIP bridges and facility communications

• Digigram HR and PCIe series of VX and PCX soundcards, UAX range, and LX6464ES
• Microsoft WDM or ALSA sound cards
• Embedded Linux processors (e.g. ARM, PowerPC)

• C++, Java, Borland, Delphi, COM, .NET

• Windows XP, Linux 2.4/2.6, Windows Vista

Visiblu is an evolving technology with changing specifications. Please contact Digigram for further details.