Abstract: A method and a system include a first inertial measurement unit (IMU) is positioned on a first member of a joint and a second IMU is positioned on a second member of the joint, where the first IMU and the second IMU each lack a magnetometer unit. A processing device receives first IMU sensor data and second IMU sensor data. The first IMU sensor data is inputted into a quaternion computation algorithm (QCA) to compute a first quaternion. The first quaternion and the second IMU sensor data are inputted into the QCA to compute a one second quaternion, where the inputting of the first quaternion imposes yaw constraints. A calibration parameter algorithm determines a mobility metric of the joint based on the first and the second quaternions, and an orientation and position of the first IMU on the first member and of the second IMU on the second member.

Abstract: Systems and methods for calculating mobility metrics associated to a plurality of wearable sensors in various arrangements comprising a plurality of communicatively-connected sensors comprising inertial measurement units (IMU) attached to connected bodies of a hinge or ball joint in communication with a computing device. Systems and methods for quaternion calculations comprising a first sensor's quaternion output as estimate into another sensor's quaternion calculation to improve the other sensor's quaternion estimate and vice versa. Systems and methods for data synchronization of a plurality of sensors involving building an external reference time vector and interpolating the sensor's data based on the reference time vector. Systems and methods for calculating a sensor's orientation and position based on the inertial measurements captured by the wearable sensors during hinge or ball joint movements to, at least, calculate a joint angle.

Abstract: A method includes receiving, at a mobile device, survey data comprising real-time survey user input associated with watching a video program and survey audio from the video program, the survey audio being recorded via a microphone of the user mobile device during the real-time survey, transmitting, to a network server, the survey data as part of a data package, wherein the network server receives an audio file associated with the video program, compares the audio file with the survey audio to yield a comparison and aligns, based on the comparison, the survey audio with the audio file to yield a modified data package and receiving a confirmation of a creation of the modified data package.

Abstract: A method includes receiving, at a mobile device, survey data comprising real-time survey user input associated with watching a video program and survey audio from the video program, the survey audio being recorded via a microphone of the user mobile device during the real-time survey, transmitting, to a network server, the survey data as part of a data package, wherein the network server receives an audio file associated with the video program, compares the audio file with the survey audio to yield a comparison and aligns, based on the comparison, the survey audio with the audio file to yield a modified data package and receiving a confirmation of a creation of the modified data package.

Abstract: A method includes receiving, at a network server, a data package from a user mobile device, the data package comprising real-time survey user input associated with watching a video program and survey audio from the video program, the survey audio being recorded via a microphone of the user mobile device during the real-time survey, receiving an audio file associated with the video program, comparing the audio file with the survey audio to yield a comparison, aligning, based on the comparison, the survey audio with the audio file to yield an modified data package and providing the modified data package.

Abstract: A method includes receiving, at a network server, a data package from a user mobile device, the data package comprising real-time survey user input associated with watching a video program and survey audio from the video program, the survey audio being recorded via a microphone of the user mobile device during the real-time survey, receiving an audio file associated with the video program, comparing the audio file with the survey audio to yield a comparison, aligning, based on the comparison, the survey audio with the audio file to yield an modified data package and providing the modified data package.

Abstract: Systems and methods for calculating mobility metrics associated to a plurality of wearable sensors in various arrangements comprising a plurality of communicatively-connected sensors comprising inertial measurement units (IMU) attached to connected bodies of a hinge or ball joint in communication with a computing device. Systems and methods for quaternion calculations comprising a first sensor's quaternion output as estimate into another sensor's quaternion calculation to improve the other sensor's quaternion estimate and vice versa. Systems and methods for data synchronization of a plurality of sensors involving building an external reference time vector and interpolating the sensor's data based on the reference time vector. Systems and methods for calculating a sensor's orientation and position based on the inertial measurements captured by the wearable sensors during hinge or ball joint movements to, at least, calculate a joint angle.

Abstract: A resonator absorber with adjustable acoustic characteristics made in the form of a cuboid with sidewalls and with an open upper face that is covered by two identical movable perforated plates to allow partial overlapping of the the plates. Each plate is equipped with bores forming a planar binary amplitude diffusor by using a maximum length pseudorandom binary sequence mapped to 2D space to determine the bore position. Bores are arranged in rows which do not overlap between plates. The resonator absorber has six cavities of different geometry situated below the perforated plates, where five cavities simultaneously change the volume with movement of the perforated plates. The resonator absorber is useful for tuning the acoustic characteristics of the environment.

Abstract: A resonator absorber with adjustable acoustic characteristics made in the form of a cuboid with sidewalls and with, an open upper face that is covered by two identical movable perforated plates to allow partial overlapping of the plates. Each plate is equipped with bores forming a planar binary amplitude diffusor by using a maximum length pseudorandom binary sequence mapped to 2D space to determine the bore position. Bores are arranged in rows which do not overlap between plates. The resonator absorber has six cavities of different geometry situated below the perforated plates, where five cavities simultaneously change the volume with movement of the perforated plates. The resonator absorber is useful for tuning the acoustic characteristics of the environment.