Measuring functions dr2, Channel transparency testing, Measuring functions 7. measuring functions dr2 – NTi Audio Digirator DR2 User Manual

Page 43

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Measuring Functions

7. Measuring Functions DR2

Channel transparency testing

The channel transparency test verifies whether the audio and
auxiliary data of a digital transmission channel are transparently
transmitted. The transparent transmission is crucial for non-
linear PCM formats such as surround sound. The verification
always covers both audio channels.

1

2

3

1

Result of the analysis

2

Status of the validity bit

of the input signal

3

Channels status informa-

tion of the input signal

The displayed validity bit

2

and channel

status details

3

are for information only.

They are not part of the transparency
measurement.

Function

The test signal used in the DR2 is a short deterministic noise
sequence. The signal stream applied to the SYNC input is mon-
itored and verified for a 16, 20 or 24 bit correlation.

AES3 transmission format frames

Preamble

Auxiliary LSB

Audio Data

MSB

V

U

C

P

0

3 4

7

8 11 12

27

28 29 30 31

<--------- 16 Bit ---------->

<----------------- 20 Bit ---------------->

<------------------------ 24 Bit ------------------------>

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