Share of Voice in Digital Signage: What It Means and How to Stop Managing It by Hand

What does share of voice mean in digital signage?

Share of voice, or SOV, is the percentage of a screen’s total playback time that a piece of content is entitled to over a given loop. If a screen runs a 60 second loop and an advertiser has bought 25% SOV, they’re contracted to 15 seconds of that loop, every time it plays.

This is a different model to booking a fixed time slot. A time slot says “you play at 9:03am for 10 seconds.” SOV says “you get a quarter of every loop, and it’s on the operator to make that happen consistently.” It’s the model most digital out of home networks and retail media networks actually sell under, because it’s simpler to communicate to advertisers and easier to guarantee over a longer campaign than a rigid schedule.

Why share of voice is harder to deliver than it sounds

The percentage is the easy part. The hard part is that creative assets almost never match their allotted time exactly.

Say a screen runs a 60 second loop and three advertisers have bought in:

• Brand A: 50% SOV, but their video is 30 seconds
• Brand B: 25% SOV, and their asset is exactly 15 seconds
• Brand C: 25% SOV, but their asset is only 15 seconds long against a 25 second target, or in some cases longer than the slot they’ve bought

Brand B fits perfectly. Brand A and C don’t. Under-length assets need duplicating to fill the time they’re owed. Over-length assets are the harder problem, since trimming a video an advertiser supplied isn’t always possible, and definitely isn’t something most operators want to be doing manually, per booking, every time a creative changes.

Multiply that across dozens of screens and hundreds of active bookings and you end up with what most operators actually do today: a spreadsheet running alongside the CMS, tracking who’s owed what, and someone manually rebuilding playlists whenever a booking starts, ends, or changes.

How Campaigns handles this automatically

We built Campaigns directly into 42 Digital Signage to remove that manual layer entirely. It works in three parts.

1. Loops define the rules. For each screen, or group of screens, you set a loop length and the increments SOV can be sold in, for example steps of 25%. This becomes the baseline every booking on that screen has to respect.

2. Campaigns are booked by percentage, not by time. Select one or multiple screens, attach the creative asset, set the SOV percentage and the campaign dates, and assign it. The system checks the screen isn’t already oversold before confirming, since total paid SOV can never exceed 100% on a single screen.

3. The system balances the loop itself. This is the part that actually saves the manual work. If an asset is shorter than its allotted time, it’s duplicated automatically to fill it. If an asset is longer than its slot and can’t be trimmed, the system extends the effective loop length so it plays in full, and duplicates every other advertiser’s content proportionally within that longer loop, so nobody’s contracted delivery gets shortened to make room. No partial playback, no manual rebuild, and no one advertiser’s oversized creative eating into another’s paid slot.

Unsold space on a screen fills itself automatically with the operator’s own House content, so a screen is never left under delivering simply because it isn’t fully booked yet.

Once everything’s assigned, a Campaign Report tracks actual plays delivered against what was booked, screen by screen, so you can show an advertiser exactly what ran and when.

Campaigns handles the booking, delivery and reporting side of running these commitments. Billing and invoicing stay with whatever finance tools you’re already using, in line with 42 Digital Signage being a CMS rather than a billing system.

Direct and programmatic, side by side

Campaigns is built for direct sold inventory, the guaranteed SOV deals you negotiate and book yourself. It’s not a programmatic connection, and it isn’t meant to be.

For operators who also want to open their screens up to programmatic demand, 42 Digital Signage integrates with Hivestack and Shinka, letting the same displays accept bids from SSPs and DSPs alongside your direct bookings. In practice that means a screen can carry a mix of guaranteed campaigns booked through Campaigns and programmatic impressions sold through Hivestack or Shinka, without needing two separate systems to manage it.

Which mix makes sense depends on the network. Direct SOV deals tend to suit anchor advertisers and longer term commitments, where a guaranteed percentage matters more than yield optimisation. Programmatic suits filling remaining inventory to the open market. Having both available from the same CMS means you’re not locked into one model before you know which one your network needs.

Why this matters more for retail media than it used to

In-store retail media is still the underdeveloped side of a market that’s already proven itself online. Only 10 to 15% of retail media spend currently goes to in-store channels, according to BCG, which means most retailers with a physical estate are sitting on inventory they haven’t properly monetised yet. The operational side is usually what’s holding that back, since running SOV commitments by hand doesn’t scale past a handful of screens and a handful of advertisers.

If you’re a retailer weighing up whether to launch a Retail Media Network on your existing screens, or a DOOH operator whose SOV bookings have outgrown a spreadsheet, this is the piece of infrastructure that makes selling by percentage sustainable rather than a full time reconciliation job. You can read more about building out a Retail Media Network on 42 Digital Signage’s Retail Media Networks page.

Frequently asked questions

What is share of voice in digital signage? Share of voice is the percentage of a screen’s total loop time a piece of content is contracted to receive, rather than a fixed scheduled time slot.

Can share of voice ever exceed 100% on a single screen? No. Paid SOV across all active campaigns on a screen is capped at 100%, and the booking system checks remaining availability before confirming a new campaign.

What happens if an advertiser’s video is longer than their SOV slot? The system automatically extends the effective loop length so the video plays in full, without cutting it short and without reducing any other advertiser’s contracted delivery.

What fills a screen’s unsold advertising space? House content, meaning the operator’s own branding or promotional material, fills any SOV that hasn’t been sold, so a screen is never left under delivering.

Does Campaigns handle billing for advertising bookings? No. Campaigns manages booking, automated delivery and reporting. Billing and invoicing remain with the operator’s own finance tools.

Is this feature an additional cost on top of 42 Digital Signage? No. Campaigns is included as standard within the existing annual software subscription.

Does 42 Digital Signage support programmatic advertising as well as direct bookings? Yes. Alongside Campaigns for direct sold, guaranteed SOV bookings, 42 Digital Signage integrates with Hivestack and Shinka, letting the same screens also accept programmatic demand from SSPs and DSPs.