MDR 24/96

The PDI·8 is the only Mackie I/O card that currently supports

88.2or 96 kHz opera- tion. Do not operate the MDR24/96 at these Sample Rates with AIO·8, DIO·8, or

OPT·8 cards installed. See Errata for more information

Synchronization

Sample Clock

The Sample Clock setting determines the source of the MDR24/96 sample clock. If the MDR24/96 is a clock master or is not connected to any other digital device(s), set it to Internal. If the MDR24/96 is a word clock slave, set it to Word Clock. The Video setting is discussed in the Technical Reference Manual.

Sample Rate

The Sample Rate determines how fast the MDR24/96 sample clock runs. Compact Disks use a 44.1 kHz sample rate, while some DVD disks use 96 kHz. The video production folks prefer 48 kHz because their digital video recorders use 48 kHz. Even though the MDR24/96 supports four Sample Rates, you can only choose between two at any given time. The range of available rates is determined by the current Project’s Sample Rate mode. The Sample Rate mode determines whether a Project will be a 24-track 44.1 kHz or 48 kHz Project, or a 12-track 88.2 kHz or 96 kHz Project. To change the Sample Rate to a setting that is not available, first create or open a Project with the desired Sample Rate mode.

You must still select the MDR24/96’s Sample Rate even if it’s slaved to another device’s clock. If you don’t set it correctly, the MDR24/96 time display will run at the wrong rate, even though audio will play at the right speed.

Bit-Depth

The Bit Depth setting determines how many bits are contained in each audio sample recorded to disk (the bit “resolution”). While 16-Bitaudio takes up 1/3 less disk space than 24-Bitaudio, 24-Bitaudio offers the potential for greater dynamic range (the difference between the softest and loudest sounds that can be recorded) and captures a more accurate “image” of the sound.

Word Clock Divisors (88.2/96 kHz operation only)

Some devices that support double-wide AES at 88.2 and 96 kHz can only transmit or receive word clock at 0.5x the Sample Rate. The Word Clock divisors determine whether Word Clock In and Word Clock Out run at 1x or 0.5x the MDR24/96 Sample Rate. Both divisors can be set independently.

To configure the MDR24/96 synchronization settings:

1.Press Sync to enter the Sync Options menu. Select Sample Clock. Select either Internal or Word Clock according to your setup using the (–)Dec / (+)Inc or << / >> buttons.

2.

Select OK to return to the

 

 

 

 

 

 

 

 

SYNC OPTIONS

[1]->

 

 

 

 

Sync Options menu.

 

 

 

3.

Select Sample Rate. Using

 

 

 

Sample

Time Code

 

SYNC

 

 

 

Clock Rate Source Rate

 

the (–)Dec / (+)Inc or << /

 

 

 

 

 

 

 

 

 

>> buttons, set the Sample Rate to 44.1 kHz or 48
kHz (88.2 kHz or 96 kHz). Select OK.

4.Move to the third page of the Sync Options menu with the Page Right (>) button.

5.Select Bit Depth. Set the Bit
Depth to 16 Bit or 24 Bit using

<-

SYNC OPTIONS

[3]

the (–)Dec / (+)Inc or << / >>

Bit

Generate

TC

buttons. Select OK.

Depth SMPTE MTC Offset

 

16

MDR 24/96