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Aes c/u/v bits pass through – Grass Valley Kameleon HD Multi-Function Modules v.3.2.0 User Manual

Page 20

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KAM-HD-MULTI—Instruction Manual

Configuration and Adjustments

KAM-HD-MULTI audio capabilities are summarized in

Table 2

below:

The KAM-HD-MULTI module can use a rear module with either balanced
or unbalanced AES audio connectors. Eight audio streams can be con-
nected in the following configurations set on the I/O Config web page:

8 inputs/0 outputs – when the module is set for 8 inputs and no out-
puts, all eight audio connectors on the rear module become inputs for
external AES audio.

4 inputs/4 outputs – when the module is set for 4 inputs and 4 outputs,
4 audio connectors become inputs for AES audio and 4 audio connec-
tors become AES audio outputs on the rear module. Refer to the I/O
Config web page for the specific rear module connector numbers.

0 inputs/8 outputs – when the module is set for 8 inputs and no out-
puts, all eight audio connectors on the rear module become inputs for
external AES audio.

AES C/U/V Bits Pass Through

The control bits that are part of each subframe of AES data are defined as
C (Channel status), U (User), and V (Valid) bits and the Z bit, which carries
the start position of the AES block frame. For the control and status bits in
the CUV positions of each audio channel, and the Z marker for each stream
(pair of channels), there is a buffer on the module that handles the asyn-
chronous timebase slips between the input and output AES stream fre-
quency.

This buffer will drop or repeat an entire block (occurring every 192 sam-
ples) of CUV bits when the two timebases cross a block boundary rather
than drop or repeat individual bits from the block.

Table 2. KAM-HD-MULTI Audio Capabilities Summary

Audio Source

Audio Type

Asynchronous Audio

Allowed

CUVZ Passthrough

Permitted

SRC Bypass

Enabled

Auto Track

Enabled

AES Rear Connector Port

Audio

Yes

Yes

1

1

CUVZ Pass Through with asynchronous inputs will cause entire blocks of C, U, and V bits to be periodically skipped or repeated.

Synchronous only

Yes or No

Non-Audio

No

Yes

1

Must be enabled

Disabled

Demultiplexed Audio

Audio

Yes

Yes

1, 2

2

Only when the input video shares the same genlock reference as the module or when the module is in input-timed mode, are the Demultiplexed streams considered

to be synchronous.

Synchronous only

2

Automatically disabled
when SRC Bypass is
enabled.

Non-Audio

No

Yes

1,2

Must be enabled

Disabled

Bypass to AES

Output Ports

Force-flagged as

Asynchronous

Mandatory

N/A

N/A

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