Audiovisual Systems Infrastructure Flashcards

Under ANSI/INFOCOMM 3M-2011, what minimum projected image contrast ratio is required for analytical decision making content?

Answer: 80:1

ANSI/INFOCOMM 3M-2011 sets 80:1 for analytical decision making, the strictest of its four viewing categories.

A projector has a throw ratio of 1.5:1 and the screen image is 3 m (10 ft) wide. What is the approximate throw distance?

Answer: 4.5 m (15 ft)

Throw distance = throw ratio × image width, so 1.5 × 3 m = 4.5 m.

Which ANSI/AVIXA standard replaced the old 4/6/8 rule as the method for sizing displays to the content and the farthest viewer?

Answer: ANSI/AVIXA V202.01 (DISCAS)

V202.01, the Display Image Size for 2D Content in Audiovisual Systems (DISCAS) standard, sizes displays from the content's element height and the farthest viewer's distance.

What is the maximum HDBaseT link length over a single twisted-pair cable, such as Category 6A?

Answer: 100 m (328 ft)

HDBaseT supports 100 m over category twisted-pair cabling, the same as the Ethernet channel limit.

Why should microphone-level cables be kept physically separated from loudspeaker-level cables in AV pathways?

Answer: To stop crosstalk from the high-level speaker signal into the very low-level mic signal

Mic signals are tens of dB lower than speaker-level signals, so running them together lets the speaker signal couple in as audible crosstalk.

Which device feature lets a display report its supported resolutions and timings to a connected source?

Answer: EDID

Extended Display Identification Data (EDID) tells the source which formats the display (sink) supports.

In a ceiling-mounted distributed loudspeaker system, what mainly sets the spacing between loudspeakers?

Answer: Ceiling height minus listener ear height, together with the loudspeaker's coverage angle

Each loudspeaker's coverage area at ear height depends on its dispersion angle and on the distance from the ceiling down to ear height.