CTS AV Signal Flow and Distribution 3

Question 1

What is 'ground loop hum' in an AV system and how is it typically resolved?

Accepted Answer

A low-frequency buzz caused by differing ground potentials, fixed with an isolation transformer or ground lift

Answer

Ground loop hum is a 60 Hz (or 50 Hz) buzz caused when equipment connected together have different ground reference potentials; isolation transformers break the loop to eliminate it.

Question 2

In AV systems, what does 'gain structure' refer to?

Accepted Answer

Setting appropriate signal levels at each stage of the signal chain to maximize dynamic range and minimize noise

Answer

Proper gain structure ensures each device in the audio chain operates at optimal signal levels, preventing noise at low levels and distortion at high levels.

Question 3

Which standard defines the pinout and electrical characteristics for RS-232 serial control in AV systems?

Accepted Answer

EIA/TIA-232

Answer

EIA/TIA-232 (formerly RS-232) is the standard that defines serial communication characteristics including voltage levels, pin assignments, and cable length limits used for AV device control.

Question 4

What is the maximum recommended cable run for standard HDMI 2.0 without an extender or active cable?

Accepted Answer

15 feet

Answer

Passive HDMI cables are generally reliable up to about 15 feet (approximately 4.5 meters) for high-bandwidth signals; longer runs require active cables or extenders.

Question 5

What does 'daisy chaining' mean in the context of AV signal distribution?

Accepted Answer

Passing a signal through multiple devices sequentially from one to the next

Answer

Daisy chaining connects devices in a series where the signal passes through each device in sequence; this can cause signal degradation and is generally avoided in professional installations.

(CTS) Certified Technology Specialist Practice Test

(CTS) Certified Technology Specialist Practice Test

CTS AV Signal Flow and Distribution 3