US 4,677,466 · Granted 1987-06-30
The Nielsen Patent That Made TV Watching Trackable
Imagine a system that watches TV or listens to radio and instantly recognizes which commercial or show is playing — without needing a human to watch it. This patent describes technology that pulls a unique digital fingerprint from the audio and video, then matches it against a library of known broadcasts to figure out what you're watching and when.
The plain-English version
What it protects
The claim covers a method for automatically identifying broadcast programs by extracting digital signatures from video and audio signals, comparing those signatures to stored reference signatures, and matching them to identify the program and its exact broadcast time. What's protected here is the specific process of detecting events in the signal, verifying stability, creating and storing these signatures, and then using them to recognize repetitive broadcasts like commercials.
Why it matters
Nielsen is the company behind TV ratings — the numbers that tell networks how many people watch each show. This patent is foundational to how they actually track viewing habits at scale. Instead of relying solely on Nielsen boxes in homes, this technology could automatically recognize what's airing across many broadcast sources, making audience measurement faster, broader, and less dependent on manual reporting.
Real-world use
Every Nielsen rating that determines whether a TV show stays on the air or gets canceled relies on technology descended from ideas in this patent — the fingerprinting methods let them track what millions of people watch without asking them directly.
Original USPTO abstract
A method and apparatus for identifying repetitively broadcast programs, such as commercial advertisements broadcast on television and radio, detects the occurrence of predetermined events in a video signal and/or in an audio signal, detects a stability condition and extracts a signature from the video and/or audio signal. The signatures and the times of occurrence of the signatures are stored and subsequently compared with reference signatures to identify the program and its time of broadcast. The reference signatures may be obtained by identifying repetitively extracted, unidentified signatures and indexing a recording of the video and/or audio signals to enable the system user to identify the unidentified broadcast program and store the previously unidentified signatures as additional reference signatures in memory.
Patent details
- Publication number
- US 4,677,466
- Filing date
- 1985-07-29
- Grant date
- 1987-06-30
- Assignee
- A. C. Nielsen Company
- Inventor(s)
- LERT, JR.; JOHN G., LU; DAOZHENG
- CPC class
- H04H20/28
Want to file your own patent?
If you're building an app that needs to identify music, videos, or broadcasts, search our database to see what fingerprinting patents already exist in this space.
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