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 sample rate must equal the highest frequency

Answer

The sample rate must be at least 10 times the highest frequency

Answer

The sample rate must be four times the bit depth

Question 2

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

Accepted Answer

Audio Engineering Society / European Broadcasting Union

Answer

Analog Encoding Standard / Electronic Broadcast Unit

Answer

Audio Exchange System / Enhanced Balanced Utility

Answer

Automated EQ System / Extended Bandwidth Utility

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

Layer 1 (physical) only

Answer

Layer 7 (application) only

Answer

Layer 4 (TCP) exclusively

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

Quantization error introduced during analog-to-digital conversion

Answer

Packet loss in a networked audio stream

Answer

Aliasing caused by undersampling

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

44.1 kHz / 16-bit only

Answer

96 kHz / 32-bit floating point only

Answer

192 kHz / 24-bit as the only option

Question 6

What does dithering accomplish when reducing bit depth in a digital audio file?

Accepted Answer

It adds low-level noise to decorrelate quantization distortion, preserving perceived dynamic range

Answer

It increases the file's bit depth to prevent truncation errors

Answer

It filters high-frequency content before downsampling

Answer

It compresses the dynamic range to fit the reduced word length