What is Vitrina? | The Technology | The Appliance | The Mobile App

What is Vitrina?

Vitrina by Spectrum Bridge delivers what fans and venues expect, deserve and demand –an enhanced media experience inside of venues that is equal or better to what can be experienced at home. Vitrina brings the home media experience to a live event.

Vitrina is a high capacity, highly scalable, mobile content delivery system that can serve dense populations of users, typically found at sports stadiums and venues. Vitrina is designed to distribute rich media content to Android/iPhone mobile devices using television broadcasting technology.  The system is ideal for enhancing the experience of patrons and spectators at stadiums, arenas, convention centers, and many other venue events that provide a context based experience. The broadcast technology used is DVB-T , an ETSI standard for the transmission of digital television. This system transmits digital audio and video in a standard MPEG transport stream.



Vitrina Application Note

Because the techniques used for television broadcasting are ideal for the distribution of high bandwidth content, tremendous scalability is possible which is unmatched by other wireless broadband technologies such as LTE and Wi-Fi, especially in crowded environments.  DVB-T is a true multicast technology and is infinitely scalable, i.e. not subject to the limitations of a contention based protocols.  By using broadcast technology, Vitrina delivers content with much less demand on mobile device battery resources.  The Vitrina system and its capabilities should not be considered as a replacement for, but as an effective compliment to other broadband communications technologies, while simultaneously enhancing user experience and reducing the load on complimentary wireless systems.

“The most common complaint from students at college sporting events these days has nothing to do with the location of their seats… It’s that reception inside crowded stadiums make[s] their smartphones utterly useless.”  The Wall Street Journal


Using television broadcasting technology to make video, audio and data available to mobile devices is not new.  However, the shortcomings of conventional TV broadcast technologies for this purpose are significant.  Existing mobile broadcast systems typically broadcast the same content over very large areas – with little attention paid to the context of an event or the desires of viewers.  Vitrina addresses context mapping by delivering targeted content, using low-power transmitters and a thin feedback loop that provides operators with real-time viewer information,  feedback and metadata.  As a result, venue operators can use analytics to maximize the relevance of the broadcast content and deliver targeted advertising.  The Vitrina system is also able to maximize the use of scarce spectrum resources by autonomously accessing the best available licensed and unlicensed VHF/UHF spectrum through Spectrum Bridge’s patented spectrum management platform.

Theory of Operations
The Vitrina system relies on proven and readily available DVB-T broadcast technology, a versatile broadcast standard.  The Vitrina system is capable of broadcasting multiple media streams as sub-multiplexes (sub-channels or streams) within a single 6MHz RF channel.  In other words, the receiver is tuned to a specific frequency (or channel) and decodes a list of individual content streams and presents them to users.  The Vitrina system conservatively combines (or multiplexes) eight (8) media streams into a single 6MHz RF channel, such that each stream is viewable at a high resolution on a mobile device.  Vitrina consists of three components, the Broadcast Appliance, the mobile application and the cloud based management system.

Vitrina Broadcast Appliance
The Vitrina Broadcast Appliance is a content delivery system, not a content creation solution, it has three primary functions – media encoding, stream multiplexing and data transmission.  It is very easy to configure and accepts three types of media inputs:

  • Live 720p inputs via HDMI (or SDI).  For example DVR or live camera feeds.
  • Stored content that is configured for play out in the Vitrina player interface.  These files are generally MP4 or other common media file formats.  An example is pre-recorded content or advertising.
  • ASI input, for more advanced users.  This may be useful for enterprise applications employing the use of existing broadcast equipment or interfaces to distribute and organize content for broadcast.


The standard Vitrina Broadcast Appliance is configured with a multi-channel HDMI encoder (which can be expanded) and a multiplexer which enables a venue operator to broadcast multiple programs simultaneously within a single RF channel. The Broadcast Appliance can adequately cover large indoor facilities (theaters, arenas, convention centers) and larger outdoor venues up to several square miles, such as stadiums and race tracks.  The broadcast management system can be used to target specific areas (by location) and groups of viewers with unique content.   Broadcast Appliances can be distributed around venues to further localize content or improve coverage, as well as ‘stacked’ to increase capacity or provide more content options to users.   VitrinaBlockDiagram

The Broadcast Appliance connects directly to the SBI FCC/Ofcom certified TVWS spectrum management system (via Internet), which autonomously grants and configures access to Television White Space (unlicensed broadcast spectrum made available for public use).  Alternatively, the appliance can access licensed spectrum, managed by Spectrum Bridge, and made available through our partners.

Mobile Application
A user needs two components to access the Vitrina content on their own device, a Mobile App and a DVB-T receiver accessory.


The small receiver attaches directly to the accessory interface. When a mobile device with the Vitrina application enters a venue, the application in conjunction with the cloud based management system (see CDMS below) facilitates auto-tuning of mobile device receivers to the provisioned Vitrina channel(s), configured for an event.  Logo insertion and application customization are also managed by the system management platform. Content streams can then be viewed! 


Content Distribution Management System (CDMS)

The Vitrina system is managed and configured by the Content Distribution Management System (CDMS) – a cloud based application that is used to manage the Broadcast Appliance, manage content distribution and enable access by mobile devices.  The configuration process is simple and includes: Specifying the files and interfaces that will be used to source content during an event,

  • Customizing program names (of individual streams) to be displayed by the mobile application,
  • Specifying event graphics and branding to be displayed by the mobile application,
  • Specifying venue parameters: name, coverage area, time, encryption,
  • Provisioning user access requirements – credentials or login requirements.

Before and during an event, content is configured for distribution.  This is accomplished by configuring live feeds (e.g. camera inputs) and stored files (e.g. pre-recorded streams).  The system incorporates a media library to prepare and organize stored media content and easy to use media player carousels to configure content for transmission. During the event, various performance metrics are recorded and processed such as user access, selections and likes.  The data can be reviewed in real-time (or retrieved later) to adapt the content delivered and measure system performance and user behavior.

Transmitter Appliance Specifications:

  • Power:  120/240 VAC, 240 W
  • Weight: 48 kg
  • Broadcast appliance dimensions:  6U; enclosure: 28” x 28” x 20 “, 72 cm, x 72 cm x 51 cm
  • Transmitter:
  • Mode: DVB-T
  • Frequency range: 470-860 MHz, auto-tunes based on authorization
  • Guard Interval:  1/4, 1/8, 1/16, 1/32
  • Code Rates: 1/2, 2/3, 3/4, 5/6, 7/8
  • Transmit Power:  23-32 dBm,
  • Channel Bandwidth 5/6/7/8 MHz,
  • Modulation: QPSK, 16-QAM, 64-QAM
  • Antenna: Telex ALP-450


  • 4 x HDMI inputs, expandable
  • Video:  H.264
  • Audio:  MPEG2 AAC


  • Remotely manageable configuration and status
  • Analytics interface
  • 4 channel media player

Mobile Device Support:

  • Android
  • iOS (available 3Q2014)


For additional information contact us at info@spectrumbridge.com