Methods and apparatus to generate reference signatures are disclosed. An example method includes collecting a first signature for media being presented to a plurality of households; crediting the media when the first signature matches a reference signature in a reference signature database; in response to determining that the first signature does not match a reference signature in the reference signature database and the first signature does not match an unidentified signature in an unknown signature database, storing the first signature in the unknown signature database; in response to determining that a second signature does not match the reference signature in the reference signature database and the second signature matches the unidentified signature in the unknown signature database, and increasing a count associated with the unidentified signature.

An example apparatus to monitor media that is presented via a mobile device includes: an application monitor to determine when media presentation software is being executed by the mobile device; and a metering information collector to collect at least one of a signature or a code of the media presented by the media presentation software based on the media presentation software being executed by the mobile device.

Methods and apparatus to determine a state of a media presentation device are disclosed. Example disclosed methods include generating a first set of weighted coefficients based on first audio received by first and second microphones at a first time. Example disclosed methods include generating a second set of weighted coefficients based on second audio received by the first and second microphones at a second time after the first time. Example disclosed methods include comparing the first set of coefficients and the second set of coefficients to generate a similarity value. Example disclosed methods include, when the similarity value satisfies a threshold, determining that the media presentation device is in a first state. Example disclosed methods include, when the similarity value does not satisfy the threshold, determining that the media presentation device is in a second state.

Handover of broadcast audio/video content from a first/source device via an intermediate device to a second/destination device. The intermediate device is set up to receive by its own means the same broadcast audio/video content as received by the first/source device. If interruption of play out of the audio/video content by the first/source device is detected by the intermediate device, the intermediate device stores the received audio/video broadcast in timeshift memory. When a presence of the second/destination is detected, the intermediate device connects to the second/destination device and starts timeshifted streaming to the second/destination device.

A system and method for generating channels of multimedia content element. The method includes correlating between a plurality of signatures of the multimedia content to determine a plurality of contexts; correlating the plurality of contexts to determine a plurality of assumptions for the multimedia content element; clustering the assumptions to create at least one story cluster characterizing a situation featured in the multimedia content element; and adding the multimedia content element to at least one channel, wherein the at least one channel is determined based on the at least one story cluster.

Methods, apparatus, and articles of manufacture for using location information to manage spillover in an audience monitoring system are disclosed. An example method involves identifying a first location of a portable metering device at a first time based on a plurality of location coordinates received from a location information system. The example method also involves generating media monitoring information corresponding to a media signal received at the first time. Additionally, the example method involves identifying the media monitoring information as being associated with a spillover signal in response to determining that a media delivery device is not located at the first location of the portable metering device at the first time.

A system and method for sharing an image showing at least one person. The method includes generating at least one signature for the image; determining, based on the generated at least one signature, at least one personal identifier of each of the at least one person, wherein each personal identifier uniquely identifies the respective person; searching, using the determined personal identifiers, for at least one sharing identifier in at least one data source, wherein each sharing identifier indicates information for sharing the image with one of the at least one person; and sending a notification indicating the image using the at least one sharing identifier.

A system and method for signature-based clustering of multimedia content elements. The method includes generating at least one signature for a first multimedia content element; determining, based on the generated at least one signature, at least one tag for the first multimedia content element; searching, using the determined at least one tag, for at least one matching multimedia content element cluster in at least one data source, wherein each multimedia content element cluster includes a plurality of clustered multimedia content elements sharing a common concept; and adding the first multimedia content element to each matching multimedia content element cluster.

Systems at a radio station provide representations to an acoustic fingerprinting service of audio content being broadcast for the provision of metadata identifying the audio content by the acoustic fingerprinting service back to the radio station for transmitting over the air or over the Internet simultaneously with the broadcast audio.

Disclosed herein are methods and systems to help disambiguate channel identification in a scenario where fingerprint data of media content being rendered by a media presentation device matches multiple reference fingerprints corresponding respectively with multiple different channels. Upon detecting such a multi-match, a server or other entity will perform disambiguation based at least in part on a comparison of time of broadcast of the media content being rendered by the media presentation device with time of broadcast of the media content represented by the reference fingerprints. The server or other entity will thereby determine the channel on which the media content being rendered by the media presentation device is arriving, so as to facilitate taking channel-specific action.