Media Presentation Verification Using Ambient Audio Comparison
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Solution Overview
Problem
Existing systems fail to accurately verify the presentation of media content on media presentation devices, such as televisions, despite being tuned to a specific channel, due to discrepancies between the output of the set-top box and the actual content displayed.
Innovation Solution
A system that includes a presentation verifier using a microphone to capture ambient audio from the media presentation device and compare it with audio signals from the set-top box, employing filters and adaptive weights to compensate for delays and attenuations, ensuring accurate verification of content presentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a set-top box determines and logs media content information based on tuned channels, then media consumption statistics can be collected, but the accuracy of verification that the content is actually presented on the media device cannot be ensured
Solution Approach 1:
The patent introduces a presentation verifier as an intermediary component that mediates between the set-top box and the media presentation device. The verifier captures audio output from the media device, processes it through fingerprinting algorithms, and compares it with reference fingerprints to determine whether the tuned content is actually being presented, thereby ensuring verification accuracy without requiring direct modification of the set-top box or media device
Solution Approach 2:
The patent replaces direct mechanical or electronic connection verification with acoustic field-based verification. Instead of checking signal transmission through cables or connections, the system uses a microphone to capture audio waves radiating from the media device speakers, converting a physical acoustic phenomenon into verifiable data for content confirmation
2Measurement precision
If audio signals are captured and compared to verify content presentation, then verification accuracy is improved, but delays and attenuations in the audio signal must be compensated for
Solution Approach 1:
The patent applies preliminary processing to the captured audio signal by computing spectrograms and extracting fingerprints before comparison. Reference fingerprints are pre-computed and stored for all possible media content. This preliminary preparation enables efficient and accurate verification without requiring complex real-time processing during the actual verification moment
Solution Approach 2:
The patent transforms the audio signal from its raw time-domain form into frequency-domain representation through spectrogram computation. This parameter transformation allows the system to compare essential features of the audio signal while being invariant to delays, attenuations, and other temporal variations that occur during playback
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of audience measurement by confirming that the media content tuned by the set-top box is indeed being presented on the media device, thereby improving the reliability of ratings information.
Implementation Method 1
a microphone to receive a free-field radiating second audio signal output by at least one of the media presentation device or an audio system associated with the media presentation device
Data Source
AI summary
Example methods and apparatus to verify presentation of media content are disclosed. A disclosed example apparatus for generating media presentation information includes a comparator to periodically output a value indicative of whether media selected via a set-top box is presented at a media presentation location by comparing a first audio signal associated with the media to ambient audio received in the media presentation location via an audio system associated with a media presentation device. The example apparatus also includes a privacy protector to facilitate operation of the comparator by periodically preventing the comparator from receiving of the ambient audio. The example apparatus also includes a metering module to record presentation of the media based on the output.