MOTU 896 User's Guide download pdf (Page 31)

INSTALLING THE 896MK3 HARDWARE

Sample rate conversion

With sample rate conversion (SRC), an extra level

of master/slave clocking is added to the equation,

as demonstrated below in Figure 4-13, which

shows the clocking going on when you transfer

digital audio from the 896mk3 (AES/EBU OUT) to

a DAT deck (AES/EBU IN) using SRC. Notice that

with SRC, the DAT deck is not slaved to the

896mk3’s system clock. Instead, their clocks are

running completely independently of one another.

But also notice that the DAT deck must still slave to

the sample-rate-converted output from the

896mk3 for a clean digital audio transfer (unless it

has its own sample rate converter on its AES/EBU

input).

Figure 4-13: Clock relationships when sending audio from the

896mk3 to a DAT deck using sample rate conversion. The DAT deck

needs to be slaving to its AES/EBU input. *Note: the 896mk3 AES/EBU

output can actually be clocked from a number of different sources. In

this example, it is resolved to the 896mk3 system clock. For details

about other possible clock sources, see “Clocking scenarios for AES/

EBU output” on page 32.

System clock, AES clock & rate convert settings

When you are setting up AES/EBU input and

output with the 896mk3, pay careful attention to

the following settings in MOTU Audio Setup (see

the quick reference overview on page 9):

■ Clock source

■ Sample rate conversion

These options are mentioned brieﬂy in the

following sections. For further details, see “Clock

Source” on page 43 and “Sample Rate Convert” on

page 46.

Clocking scenarios for AES/EBU input

There are three possible clocking scenarios for the

896mk3 AES/EBU input:

1. Simple transfer (slave the 896mk3 system clock

to the AES/EBU input signal — no sample rate

conversion).

2. Sample rate convert the AES/EBU input.

3. Use word clock to resolve the 896mk3 system

clock and the other AES/EBU device with each

other.

These three AES/EBU input scenarios are

summarized below.

896mk3 master clock

Input

clock

Output

clock

896mk3

Sample Rate

converter

(slaves to 896mk3 SRC output clock)

(master)

(slaves to 896mk3 master clock)

DAT deck

(master*)

Scenario 1 Scenario 2 Scenario 3

Description

Simple

transfer

Rate

convert

Use word

clock

896mk3 clock

source setting

AES/EBU Any setting

except

AES/EBU

Word Clock

Sample rate

conversion

setting

None AES In None

Required

896mk3 cable

connections

AES/EBU In AES/EBU In AES/EBU In

and Word

Clock In

Are the devices

continuously

resolved?

Yes No Yes

Is the signal

being sample

rate converted?

No Yes No

Example

application

Simple digital

transfer into

the 896mk3

from DAT

deck or digi-

tal mixer.

Transfer from

digital mixer

running at a

different

sample rate.

Both the

896mk3 and

other AES/

EBU device

are slaved to

‘house” word

clock.

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MOTU 896 User's Guide Page 31

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