MEDIA MONITORING USING MULTIPLE TYPES OF SIGNATURES

Example apparatus disclosed herein include means for processing media signatures of a first type to monitor media presented by a media device, the processing of the media signatures of the first type to be performed until a first media signature of the first type is determined to match a reference signature of the first type. Disclosed example apparatus also include means for processing media signatures of a second type associated with the first reference media to monitor the media presented by the media device, the processing of the media signatures of the second type to begin after the first media signature of the first type is determined to match the reference signature of the first type, the processing of the media signatures of the second type to end when a number of media signatures of the second type is determined not to match corresponding reference signatures of the second type.