Methods and apparatus are disclosed for supplementing partially readable and/or inaccurate codes. An example apparatus includes a watermark analyzer to select a first watermark and a second watermark decoded from media; a comparator to compare a first decoded timestamp of the first watermark to a second decoded timestamp of the second watermark; and a timestamp adjuster to adjust the second decoded timestamp based on the first decoded timestamp of the second watermark when at least a threshold number of symbols of the second decoded timestamp match corresponding symbols of the first decoded timestamp.

Methods, apparatus, systems and articles of manufacture to update audio sensor configuration are disclosed. An example apparatus includes at least one memory, instructions in the apparatus, and processor circuitry to execute the instructions to: in response to detection of an update to audio sensor configuration, identify a plurality of potential audio sensor configurations to be used to receive audio, select respective ones of the identified potential audio sensor configurations for testing, determine signal-to-noise ratios corresponding to each of the selected ones of the potential audio sensor configurations, select the greatest signal-to-noise ratio of the signal-to-noise ratios, compare the greatest signal-to-noise ratio value and a noise ratio change threshold, and in response to the selected greatest signal-to-noise ratio value exceeding the noise ratio change threshold, update a configuration memory to cause use of the potential audio sensor configuration corresponding to the selected greatest signal-to-noise ratio.

Methods, apparatus, systems and articles of manufacture to measure exposure to streaming media are disclosed. An example apparatus to measure media exposure, the apparatus including memory, computer readable instructions, and processor circuitry to execute the computer readable instructions to obtain an image of streaming media presented by a media device, the media device separate from the processor circuitry, extract a video watermark from a chroma key of the obtained image, convert the video watermark into text formatted metadata, and transmit the text formatted metadate to a central facility.

Apparatus, systems, articles of manufacture, and methods for viewer authentication are disclosed. An example system comprises memory, first instructions, and processor circuitry to execute the first instructions to send one or more second instructions to the device, the second instructions to cause the device to trigger collection of audio metering data from a sensed audio signal based on a programming schedule that is to identify when the program is to be broadcast, the program associated with a first time duration, the audio metering data associated with a second time duration, accept voting data from the user for a ballot presented in the program, and transmit the audio metering data and the voting data, determine a level of exposure of the user to the program based on the first time duration and the second time duration, and adjust the voting data based on the level of exposure.

Methods, apparatus, systems and articles of manufacture (e.g., physical storage media) to implement flexible commercial monitoring for television audience measurement are disclosed. Example television audience measurement systems disclosed herein include a flexible commercial detector to detect whether a first watermark decoded from a television program broadcast signal is a bridge watermark that indicates a portion of the television broadcast signal including the bridge watermark is associated with a flexible commercial insertion event, the flexible commercial insertion event corresponding to insertion of a flexible commercial in the portion of the television broadcast signal. Disclosed example television audience measurement systems also include a commercial metric calculator to credit audience exposure associated with the portion of the television broadcast signal to a flexible commercial crediting metric in response to a determination that the first watermark is the bridge watermark.

Methods and apparatus to audio watermarking and watermark detection and extracted are described herein. An example method includes receiving a media content signal, sampling the media content signal to generate samples, storing the samples in a buffer, determining a first sequence of samples in the buffer, determining a second sequence of samples in the buffer, wherein the second sequence of samples is of substantially equal length as the first sequence of samples, calculating an average of the first sequence of samples and the second sequence of samples to generate an average sequence of samples, extracting an identifier from the average sequence of samples, and storing the identifier in a tangible memory.

Example levitating meter apparatus are disclosed. An example metering system includes a meter having a display to present indicia associated with a panelist. The meter has a microphone to receive audio output from a media device and circuitry to perform media monitoring. A base includes a cavity to receive at least a portion of the meter. The meter to magnetically levitate relative to the base to decouple the meter from the base. The base and the meter structured to fix a rotational position of the meter relative to the base when the at least the portion of the meter is received by the cavity of the base and the meter levitates relative to the base.

Example methods and apparatus to detect audio engineering problems using identification of isolated watermarks are disclosed herein. Disclosed example methods include identifying, by executing an instruction with a processor, isolated watermarks in a first set of detected watermarks obtained from first media monitored at a first site. Disclosed example methods further include determining, by executing an instruction with the processor, a problem has been detected with the first media associated with the first set of detected watermarks in response to a first number of isolated watermarks identified in the first set of detected watermarks satisfying a first threshold.

Methods, apparatus, systems and articles of manufacture are disclosed herein to identify media presentation by analyzing network traffic. Example instructions cause a machine to generate a traffic profile to reduce a computational burden of identifying streaming media being presented on a media presentation device, the traffic profile including first network traffic data indicative of the streaming media; obtain the traffic profile and second network traffic data corresponding to the streaming media; and generate, in response to a score for the second network traffic data meeting a threshold of similarity, a network traffic analysis report identifying the streaming media being presented on the media presentation device.

Apparatus, systems, articles of manufacture, and methods for viewer authentication are disclosed. An example system includes processing circuitry to execute computer readable instructions to send one or more instructions to cause the user device to: trigger collection of audio metering data from a sensed audio signal based on a programming schedule that is to identify when the program is to be broadcast; accept voting data from the user for a ballot presented in the program; transmit the audio metering data; and transmit the voting data. The processing circuitry also is to determine a level of exposure of the user to the program based on the audio metering data received from the user device; calculate a weighting score based on the level of exposure; and adjust the voting data based on the weighting score.