Abstract: Example headsets and methods for gathering electroencephalographic signals are disclosed herein. An example headset disclosed herein includes a cap to be worn on a head of a person and a first electrode carried by the cap. The first electrode holder defines a first opening therethrough. The example headset includes a first electrode that insertable into the first opening. The first electrode has a first length and is adjustable in the first opening to a first plurality of discrete positions having different depths of insertion relative to the first opening. The first electrode is to engage the head of the person when inserted a sufficient depth into the first opening. The example headset also includes a second electrode that is interchangeable with the first electrode and insertable into the first opening.

Abstract: Example methods disclosed herein to perform inventory display auditing include comparing a reference image of an inventory display obtained during a prior audit of the inventory display with a current image captured by a camera to determine whether the current image corresponds to the same inventory display as the reference image. Disclosed example methods also include, when the current image is determined to correspond to the same inventory display as the reference image, identifying a difference region in the current image corresponding to a portion of the inventory display that changed relative to the prior audit. Disclosed example methods further include, while the current image is displayed on a display screen, modifying a characteristic of the current image in the difference region to indicate a change in product inventory in the portion of the inventory display.

Abstract: Example headsets and methods for gathering electroencephalographic signals are disclosed herein. An example headset disclosed herein includes a cap to be worn on a head of a person and a first electrode carried by the cap. The first electrode holder defines a first opening therethrough. The example headset includes a first electrode that insertable into the first opening. The first electrode has a first length and is adjustable in the first opening to a first plurality of discrete positions having different depths of insertion relative to the first opening. The first electrode is to engage the head of the person when inserted a sufficient depth into the first opening. The example headset also includes a second electrode that is interchangeable with the first electrode and insertable into the first opening.

Abstract: Example headsets and methods for gathering electroencephalographic signals are disclosed herein. An example headset disclosed herein includes a cap to be worn on a head of a person and a first electrode carried by the cap. The first electrode holder defines a first opening therethrough. The example headset includes a first electrode that insertable into the first opening. The first electrode has a first length and is adjustable in the first opening to a first plurality of discrete positions having different depths of insertion relative to the first opening. The first electrode is to engage the head of the person when inserted a sufficient depth into the first opening. The example headset also includes a second electrode that is interchangeable with the first electrode and insertable into the first opening.

Abstract: Example methods disclosed herein to perform inventory display auditing include comparing a reference image of an inventory display obtained during a prior audit of the inventory display with a current image captured by a camera to determine whether the current image corresponds to the same inventory display as the reference image. Disclosed example methods also include, when the current image is determined to correspond to the same inventory display as the reference image, identifying a difference region in the current image corresponding to a portion of the inventory display that changed relative to the prior audit. Disclosed example methods further include, while the current image is displayed on a display screen, modifying a characteristic of the current image in the difference region to indicate a change in product inventory in the portion of the inventory display.

Abstract: Example methods disclosed herein include overlaying a semi-transparent version of a reference image over a sequence of captured images as respective ones of the captured images are displayed on a display of a portable device. Such disclosed example methods also include determining a directional difference between a first one of the captured images and the reference image. Such disclosed example methods further include presenting a directional prompt to indicate a direction to move the portable device to cause a subsequent second one of the captured images to coincide with the reference image.

Abstract: Example headsets and methods for gathering electroencephalographic signals are disclosed herein. An example headset disclosed herein includes a cap to be worn on a head of a person and a first electrode carried by the cap. The first electrode holder defines a first opening therethrough. The example headset includes a first electrode that insertable into the first opening. The first electrode has a first length and is adjustable in the first opening to a first plurality of discrete positions having different depths of insertion relative to the first opening. The first electrode is to engage the head of the person when inserted a sufficient depth into the first opening. The example headset also includes a second electrode that is interchangeable with the first electrode and insertable into the first opening.

Abstract: Signature-based program identification apparatus and methods for use with digital audio and/or video systems are disclosed. The disclosed systems and methods develop signatures of digital audio and/or video content from a digital data stream at two or more sites and compare the signatures to one another to identify the content.

Abstract: Example methods disclosed herein include overlaying a semi-transparent version of a reference image over a sequence of captured images as respective ones of the captured images are displayed on a display of a portable device. Such disclosed example methods also include determining a directional difference between a first one of the captured images and the reference image. Such disclosed example methods further include presenting a directional prompt to indicate a direction to move the portable device to cause a subsequent second one of the captured images to coincide with the reference image.

Abstract: Image overlaying and comparison for inventory display auditing is disclosed herein. An example method to perform inventory display auditing disclosed herein comprises overlaying a reference image over a current image displayed on a camera display, the reference image corresponding to an inventory display to be audited, comparing the reference image and the current image to determine whether the current image and the reference image correspond to a same scene and when the reference image and the current image are determined to correspond to the same scene, indicating a difference region in the current image displayed on the camera display, the difference region being a first region of the current image that differs from a corresponding first region of the reference image.

Abstract: Methods and apparatus for identifying a digital audio signal are described. An example apparatus for identifying a digital audio signal includes an input to receive the digital audio signal, which includes data from a broadcast or a stored digital program signal. The example apparatus also includes a detector to receive the digital audio signal from the input and determine whether the received digital audio signal is uncompressed as received at the input; a decoder to receive the digital audio signal from the detector when the digital audio signal is compressed as received at the input and identify any first program-identifying code in an auxiliary field of the compressed digital audio signal; and a code reader to receive the digital audio signal from the detector when the digital audio signal is uncompressed as received at the input and receive the digital audio signal from a decompressor when the digital audio signal is compressed as received at the input.

Abstract: Image overlaying and comparison for inventory display auditing is disclosed herein. An example method to perform inventory display auditing disclosed herein comprises overlaying a reference image over a current image displayed on a camera display, the reference image corresponding to an inventory display to be audited, comparing the reference image and the current image to determine whether the current image and the reference image correspond to a same scene and when the reference image and the current image are determined to correspond to the same scene, indicating a difference region in the current image displayed on the camera display, the difference region being a first region of the current image that differs from a corresponding first region of the reference image.

Abstract: Signature-based program identification apparatus and methods for use with digital audio and/or video systems are disclosed. The disclosed systems and methods develop signatures of digital audio and/or video content from a digital data stream at two or more sites and compare the signatures to one another to identify the content.

Abstract: Signature-based program identification apparatus and methods for use with digital audio and/or video systems are disclosed. The disclosed systems and methods develop signatures of digital audio and/or video content from a digital data stream at two or more sites and compare the signatures to one another to identify the content.

Abstract: Methods and apparatus to infer operating states of a display based on visible light are disclosed. An example device includes an optical receiver to be positioned with respect to a display to receive visible light from the display. The example device includes a sensor to measure a color and an intensity of the visible light received. The example device includes an operating state detector to analyze the measured intensity and color of the visible light detected by the sensor to generate an output indicative of an operating state of the display.

Abstract: Methods and apparatus for identifying a digital audio signal are described. An example apparatus for identifying a digital audio signal includes an input to receive the digital audio signal, which includes data from a broadcast or a stored digital program signal. The example apparatus also includes a detector to receive the digital audio signal from the input and determine whether the received digital audio signal is uncompressed as received at the input; a decoder to receive the digital audio signal from the detector when the digital audio signal is compressed as received at the input and identify any first program-identifying code in an auxiliary field of the compressed digital audio signal; and a code reader to receive the digital audio signal from the detector when the digital audio signal is uncompressed as received at the input and receive the digital audio signal from a decompressor when the digital audio signal is compressed as received at the input.

Abstract: Method and apparatus for identifying broadcast digital audio signals include structure and/or function whereby the digital audio signal is provided to processing structure which is configured to (i) identify a program-identifying code in the received digital audio signal, (ii) identify a program-identifying code in a decompressed received digital audio signal, (iii) identify a feature signature in the received digital audio signal, and (iv) identify a feature signature in the decompressed received digital audio signal. Preferably, such processing structure is disposed in a dwelling or a monitoring site in an audience measurement system, such as the Nielsen TV ratings system.

Abstract: Method and apparatus for identifying broadcast digital audio signals include structure and/or function whereby the digital audio signal is provided to processing structure which is configured to (i) identify a program-identifying code in the received digital audio signal, (ii) identify a program-identifying code in a decompressed received digital audio signal, (iii) identify a feature signature in the received digital audio signal, and (iv) identify a feature signature in the decompressed received digital audio signal. Preferably, such processing structure is disposed in a dwelling or a monitoring site in an audience measurement system, such as the Nielsen TV ratings system.

Abstract: Method and apparatus for identifying broadcast digital audio signals include structure and/or function whereby the digital audio signal is provided to processing structure which is configured to (i) identify a program-identifying code in the received digital audio signal, (ii) identify a program-identifying code in a decompressed received digital audio signal, (iii) identify a feature signature in the received digital audio signal, and (iv) identify a feature signature in the decompressed received digital audio signal. Preferably, such processing structure is disposed in a dwelling or a monitoring site in an audience measurement system, such as the Nielsen TV ratings system.

Abstract: A circuit card is interfaced to a powered electrical bus by applying power to the circuit card before it interfaces to the electrical bus or by removing power from the circuit card after it has been removed from the bus. This is accomplished using a power cord that connects the equipment's power supply to a mating connector on the card to be inserted or removed. Attaching the power cord to the mating connector of the card disables the output drivers that provide output signals to the equipment's communication bus and places the card in a reset state. This prevents introducing error signals onto the communication bus. Additionally, the contacts on the edge connector are sequenced to prevent applying power to the circuit card before a ground is available. Additionally, the power cord and circuit card are keyed to prevent improper insertion and the power card includes an inductor to provide surge protection.