MIL-DTL-87268D
and 3000 Hz. Non-verbal audio tones shall be of suficiently low intensity and duration so as not to startle
the hearer, add to overall noise levels, or interfere with local speech.
3.3.6.1.1 Non-verbal auditory tones in conjunction with error messages and alerts. Non-verbal auditory
tones used in conjunction with a visually displayed error message or alert, shall consist of a single frequency
and shall precede the presentation of the visually displayed message or alert by no more than 0.5 seconds.
3.3.6.1.2 Compatibility with ambient conditions. Non-verbal auditory tones which might be mistaken for
tones commonly found in the work environment shall not be used.
3.3.6.2 Computer-generated or electronically-stored speech. Computer generated or electronically stored
speech shall be limited to procedural information.
3.3.6.2.1 Abbreviations. Computer generated or electronically stored speech shall be encoded to pronounce
the entire word an abbreviation represents,e.g., for the abbreviation "sec." the word "second" shall be
pronounced. Computer generated or electronically stored speech shall be encoded to pronounce the individual
letters of abbreviations of multi word phrases, without regard to case or punctuation, when that pronunciation
is in common usage, e.g., for the abbreviation "A.D." (Anno Domino), the individual letters "a" and "d"
shall be pronounced. When pronunciation of the individual letters of abbreviations of multi word phrases is
not in common usage, computer generated or electronically stored speech shall be encoded to pronounce
each word the abbreviation represents, e.g., for the abbreviation "SSE", shall be pronounced "South-southeast.
3.3.6.2.2 Acronyms. Any acronym used in the context of procedural information that either cannot be or
typically is not pronounced as a whole recognizable word, shall be encoded by the computer speech system
as single letters, e.g., the acronym "APU" shall be pronounced: "A P U".
3.3.6.2.3 Alphanumeric strings. Any string of digits or alphanumeric characters used in the context of
procedural information that typically are not pronounced as an intact unit shall be encoded as single
spoken letters or combinations of numbers and letters, e.g., the reference designator A1A12A9 shall be
pronounced: "A one A twelve A nine;" while the part number 78349015 shall be pronounced: "seven
eight three four nine zero one ive.
3.4 General requirements for common user interface. IETMs and the associated EDS presentation software
shall provide the display formatting and user interaction functions described herein. Required user interaction
functions, written in uppercase throughout this speciication, shall not be employed as literal key names
on an EDS device, but shall be treated as logical or "virtual" functions which shall be implemented as
speciied for the particular display system. For example, the cursor movement and selection functions can be
optionally implemented by a mouse, a joystick, a track ball, a light pen, a touch panel, voice commands,
or arrow keys with a selection key. An OK function can be implemented as a dedicated key labeled
"enter" or a "soft" function key. This speciication identiies the logical user input functions which shall
be supported by the display system, without specifying the exact keyboard or hardware requirements for
the display system. Table I provides a list of the minimum user interface virtual functions and general
deinitions of those functions. These functions shall be implemented to permit the minimum functionality as
described below. However, this shall not preclude additional detailed requirements in an IETM presentation
software speciication that further deines functionality.
3.4.1 Common user interface components. A common set of components and presentation conventions shall
be used to provide a consistent user interface across all presentation devices. Common user interface
components described in this speciication shall be implemented on all types of presentation systems used
unless otherwise speciied (see 6.2n). The components cursor, windows, menus, controls, dialogs, and
optional pointer shall be implemented as shown in table I.
3.4.1.1 Cursor. If the information on the screen is capable of being selected, the system shall provide the
user with the ability to select the information with a cursor. The cursor shall designate the position on the
screen where the input is focused. The cursor shall be visually and consistently distinguishable from other
information on the display. Selectable information shall be visually and consistently distinguishable from the
cursor and other information on the screen, e.g., by the use of a border or frame around the selectable object.
3.4.1.1.1 Selection. The user shall be able to select items in the client area with the cursor. The IETM
shall provide the user with a visual feedback of the selection. Selecting an already selected item shall
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