Broadcast: definition, uses and applications in audiovisual and IT

Ah, the term “broadcast”, heard everywhere on TV, on the radio or in IT... But what does it really mean? Let us look at this notion and its exact meaning in English as well as in French, and how it applies in everyday life in audiovisual or in networks.

We start from the historical foundations of radio broadcasting and move on to current uses. You will see that the path is simpler than it looks!

The term broadcast is part of our media landscape, but what exactly does it cover? Let us look at what is worth remembering. At an event, all of this is run from Event Production Management, which synchronises video recording, sound and distribution.

Did you know that this word has its roots in English? Originally, it referred to the agricultural gesture of scattering seed widely (“broad” for wide, “cast” for throw). In French, the usual terms are radiodiffusion (radio broadcasting) or télétransmission (remote transmission), depending on the case.

Today, broadcasting means sending content simultaneously from one transmitter to multiple receivers. Whether it is a TV programme, a live audio stream or data on a network, the technical principle stays the same: wide distribution.

According to the Encyclopædia Britannica, this covers electronic transmissions intended for the general public, whether by radio, television or digital services.

A key point? The scalability of the system, whatever the platform used.

In practice, live broadcasting often involves specific technical challenges. Take a multilingual programme: simultaneous interpretation for international participants requires dedicated audio support.

These constraints show how technical and editorial aspects are intertwined in this field.

Broadcasting is much more than a simple theoretical concept. Let us look at how it applies in practice across different technical sectors.

For traditional media, broadcast relies mainly on radio waves and satellites. Did you know that the first radio stations used frequencies below 30 kHz? A rudimentary system compared with current standards.

Take the example of the BBC in English and France Télévisions in French. These historic players use broadcasting to distribute their programmes, whether audio content or television programmes. Their technical support network sometimes covers several continents.

In computer networks, broadcast makes it possible to send a signal to all connected machines. The dedicated IP address (xxx.xxx.xxx.255) acts as a technical amplifier.

Common protocols such as ARP and DHCP rely on broadcast. For DHCP, it is thanks to this system that your computer obtains an IP address automatically. As for ARP, it uses this method to identify the devices on the network.

Emergency SMS alerts use broadcasting to quickly reach everyone in a geographical area. A practical application that saves lives.

With 5G and the IoT, broadcast becomes more powerful. The ETSI is working on exactly these standards. Technical translation between different protocols remains a major challenge for multimedia broadcasting services.

These advances make it possible, among other things, to handle very high-bitrate live streams.

Broadcasting has evolved radically with digital. This technical transformation now opens up unprecedented prospects for audio and television, particularly in terms of the services offered.

The move to digital, through technical standards such as DAB+ (digital radio) and DTT, marks a key turning point for broadcasting. These developments have a direct impact on production methods.

Let us look at how recent technical advances are redefining the sector:

• Live streaming: Allows live broadcasts with participant interaction, ideal for sport or news.
• CDN: Optimises the technical distribution of content through local servers, reducing latency.
• IP multicast: A bandwidth-efficient network solution for broadcasting to a wide audience, used in satellite services and broadcasting.
• 4K UHDTV: Significantly improves the visual experience, although it needs suitable technical support.
• ATSC 3.0: A hybrid television/internet standard allowing interactive services.

These technical advances redraw the outlines of modern broadcasting, particularly for multilingual programmes.

The cloud and AI bring unprecedented flexibility. Adopting them makes it easier for hybrid broadcasting services to emerge, combining decentralised storage and intelligent audio processing.

On the technical side, workflow automation is becoming more relevant, especially for multilingual content that needs specific support.

The industry is accelerating its migration to cloud infrastructure, with advanced broadcasting features built in natively.

An evolution that concerns traditional players as much as new entrants in the sector.

Broadcasting is not just theory. You find it everywhere in our daily lives. Let us see how it plays out in practice.

Take major events such as the Olympic Games or the World Cup. Broadcasting allows hundreds of millions of viewers to follow live, whatever their time zone. Did you know that, on average, half of the world’s population follows each edition of the Olympic Games?

Here, broadcast shows its practical usefulness. Traffic messages go through dedicated channels, sometimes with an English version for foreign drivers.

On the technical side, it relies on a network of sensors and radio relays. Not bad for avoiding traffic jams!

In aviation, the ADS-B system uses broadcasting to locate aircraft. Every second, aircraft send their position over a satellite network.

Air traffic controllers receive this technical data in real time, with an interface automatically translated into French or English depending on the country.

Here, we enter the IIoT. Sensors continuously send technical data to analysis platforms.

The clever bit? These systems can switch automatically between different transmission media (radio, satellite, local network) depending on how critical the data is.

Starlink is currently testing global broadcast via its satellite constellation.

The goal? To broadcast live audio and video content anywhere on the planet, even in areas with no coverage. Quite a technical challenge to maintain quality of service.

Imagine watching a match live with player stats overlaid on the picture. Or following a TV programme where the presenters interact with your living room through spatial audio. These prototypes use classic broadcasting streams, enriched with layers of real-time technical data.

Broadcast, whether in radio or computer systems, is an all-pervasive concept. Grasping this definition of broadcast gives you practical access to the mechanisms by which information is distributed.

And what if we explored together these communication networks that shape our daily lives? The audiovisual world is open to you, no less.