CAT CAT Digital Audio and Networking

Question 1

What is the Nyquist theorem's requirement for the sample rate relative to the highest audio frequency to be captured?

Accepted Answer

The sample rate must be at least twice the highest frequency

Answer

The Nyquist theorem states that to accurately reconstruct a signal, the sample rate must be at least twice the highest frequency present in the signal.

Question 2

What does the acronym AES/EBU stand for in professional audio?

Accepted Answer

Audio Engineering Society / European Broadcasting Union

Answer

AES/EBU (Audio Engineering Society / European Broadcasting Union) is a standard digital audio interface that carries two channels of digital audio over a balanced 110 Ω XLR cable.

Question 3

Which Dante network audio transport protocol layer does Dante audio primarily operate on?

Accepted Answer

Layer 2 (Ethernet) and Layer 3 (IP/UDP)

Answer

Dante uses standard Ethernet at Layer 2 for device discovery and Layer 3 UDP/IP for media transport, allowing it to run on standard managed switches.

Question 4

What is jitter in a digital audio system?

Accepted Answer

Timing variations in the digital clock that cause audible noise or distortion

Answer

Jitter is the variation in timing of the digital sampling clock; even small inconsistencies can cause phase noise and distortion in the reconstructed audio signal.

Question 5

What standard sample rate and bit depth is used by the AES67 networked audio interoperability standard?

Accepted Answer

48 kHz / 24-bit (primary reference, with others supported)

Answer

AES67 specifies 48 kHz as the primary reference sample rate and supports 16- and 24-bit linear PCM, though 96 kHz is also supported as an option.

(CAT) Commercial Audio Technician Practice Test

(CAT) Commercial Audio Technician Practice Test

CAT CAT Digital Audio and Networking