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EMG

Vicon MX Hardware System Reference Glossary-9

uses the SMPTE timecode standard. Also

see CCIR, LTC, NTSC, SMPTE timecode,

Timecode, and VITC.

EMG Electromyography. A test for

detecting the electrical activity of muscles

and the nerves controlling them to assess

their health. Vicon application software

can record and analyze the analog signals

from third-party EMG devices integrated

into a Vicon system. Also see Analog,

Datastation, and MX Control.

.enf file Eclipse Node File. A text file

with extension .enf, which contains all the

information about a specific node level in

an Eclipse database. This file contains the

default fields defined in the .eni file on

which it was based. An .enf file is

generated for each node in an Eclipse

database. Also see Eclipse database and

.eni file.

.eni file Eclipse Node Initialization file.

A text file with extension .eni, which

contains a definition of the default

hierarchy of Eclipse database nodes for a

specific application area, such as

animation, clinical, and generic. This file

is used as a template for creating specific

.enf files. The root .eni files are contained

in the Vicon Eclipse folder (by default,

C:\Program Files\Vicon\Eclipse). Also see

Eclipse database and .enf file.

Ergo calibration frame A type of

static calibration object. This object is a

triangular metal frame with a rectangular

hole, four markers positioned on its upper

side, adjuster screws, and two spirit

levels. Also see Static calibration object.

Ethernet network A local area

network (LAN) architecture based on the

IEEE 802.3 standard for contention

networks. Standard Ethernet supports

data transfer rates of 10 Mbps.

100Base-T (or Fast Ethernet) supports

data transfer rates of 100 Mbps. Gigabit

Ethernet supports data transfer rates of

1 Gigabit. A Vicon system runs over its

own dedicated Ethernet network;

Vicon MX uses Gigabit Ethernet

communications. Also see LAN.

Euler angles The three angles defining

the three rotation matrices of an object

about an axis. These angles are used to

relate two orthogonal coordinate systems

in a kinematic model for a motion capture

subject. Also see Kinematic model and

Rotation.

Event A single action in the time span

of a trial. For example, a foot contacting

the floor during a walking trial is an

event. Each event must have an

associated context. Events are indicated

on the context bar in some Vicon

application software. Also see Context,

Context bar, and Normalization scheme.

F

F20 See MX-F20.

F40 See MX-F40.

F-series Camera A range of high-

resolution, digital, motion capture

cameras: MX-F40 and MX-F20. This

range of Vicon cameras was supplied with

Vicon MX systems after April 2007.

F-series Cameras provide high-speed,

low-latency motion capture. F-series

Cameras are made of lead-free

components to comply with

environmental regulations. Each F-series

Camera is fitted with the proprietary

Vicon Vegas CMOS sensor and a strobe

unit with surface-mount LEDs. Each is

programmed with Vicon application

firmware to control its operation and

enable it to perform its own onboard

processing. Also see MX-F20, MX-F40,

Firmware, MX Camera, MX+ Camera,

RoHS compliant, and Vegas sensor.

F-stop See Aperture.

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