US 5,481,294 · Granted 1996-01-02

How Nielsen Cracked the Code on What You're Actually Watching

Nielsen figured out how to track what TV shows people actually watch by embedding hidden codes into broadcasts and matching them against what households record. Instead of just knowing you turned on a channel, they can now prove exactly which program you watched and when—the data that makes TV ratings real.

Curated and verified by the IsItPatented Editorial team

The plain-English version

What it protects

The claim covers a system for measuring TV and radio audiences by comparing two kinds of data: codes or digital 'fingerprints' extracted from programs at household meters, matched against reference data collected from the actual broadcast stream. What's protected here is the specific method of using embedded ancillary codes or passive program signatures to identify which exact show was viewed, rather than just which channel was tuned, and the apparatus and process for comparing household viewing records against a reference database to determine viewing patterns.

Why it matters

This patent addresses a fundamental challenge in media: proving what people actually watched so advertisers and networks can negotiate based on real viewership data. Before this approach, TV ratings relied on surveys or crude channel-tuning meters that couldn't distinguish between programs on the same channel. By automating the identification and matching process, Nielsen created the technological backbone for audience measurement that determines multi-billion-dollar advertising decisions.

Real-world use

Every time a TV network reports how many viewers watched a show last night, those numbers likely trace back to Nielsen meters using this patented matching system to verify exactly which program was playing in thousands of households.

Original USPTO abstract

An audience measurement system collects data representative of tuned programs rather than of tuned channels, and includes (i) a household metering apparatus which records ancillary codes or extracts program signatures from the programs if no ancillary codes are found therein, (ii) a reference apparatus which monitors broadcast programs to be monitored, which extracts reference signatures therefrom, which records whatever ancillary codes may be associated with these broadcast programs and, if no ancillary codes are present, which compresses and stores a digital replica representative of the broadcast programs to be monitored, (iii) a data collection apparatus which compares the household and reference data to determine (a) which of the broadcast programs to be monitored were selected for viewing and/or listening, (b) which of the metered households selected the broadcast programs to be monitored for viewing and/or listening, and (c) at which times the broadcast programs to be monitored were selected for viewing and/or listening.

Patent details

Publication number: US 5,481,294
Filing date: 1993-10-27
Grant date: 1996-01-02
Assignee: A. C. Nielsen Company
Inventor(s): THOMAS; WILLIAM L., LU; DAOZHENG
CPC class: H04H20/31

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