M-Audio Digital Recording Interface Delta 44 Spécifications télécharger pdf (Page 14)

setting the master clock to "S/PDIF In" will synchronize the Delta TDIF

card to the S/PDIF input data and its digital audio will be transferred

properly.

In situations where TDIF Clk is being used, such as a clock from a Tascam

digital multitrack or digital mixer that has TDIF I/O, the Delta TDIF

Audio Card should similarly be configured to get its master clock from

the TDIF Clk data stream. The reason for this is the same – a TDIF data

stream coming from an external source is rarely going to be in sync with

the Delta TDIF Audio Card (or other digital audio devices in the system),

even if the sample rates are set the same. If the master clock were set to

use the internal crystal (or S/PDIF In for that matter), then the incoming

TDIF audio would have "pops," "crackles," and other undesirable audio

artifacts present in it. Instead, setting the master clock to "TDIF Clk" will

synchronize the Delta TDIF Audio Card to the TDIF input data and its

digital audio will be transferred properly. The special case to consider,

again, is the external unit sending the TDIF digital audio to the Delta

TDIF card may be "locked" to the word clock emitted from the Delta TDIF

card. In these cases, the Delta TDIF and the external TDIF device are in-

sync, and the TDIF data would therefore be in-sync with the Delta TDIF

system when the Delta TDIF card is set to “Internal Xtal.”

Finally, the S/PDIF In and TDIF Clk options may be used to operate the

Delta TDIF at non-standard sample rates. When one of these two options

is selected, the Delta TDIF’s sample rate will automatically match that of

the incoming S/PDIF or TDIF data stream.

NOTE: When either the S/PDIF or TDIF In is selected as the master

clock source, the Delta TDIF mixer’s frequency response will be

affected by whatever sample rates you inject at the S/PDIF or TDIF

In. This is because (1) the digital mixer operates at the same

sample rate as the rest of the board, and (2) sample rate and

frequency response are directly correlated.

Using the Delta TDIF with your Music

Software Application

Once the Delta TDIF’s hardware and driver software are properly

installed, it is ready for use with your music application software. Some

of these applications may require you to highlight or enable the Delta

TDIF drivers within the program, and others may have a utility that

analyzes or profiles the audio cards in your system and enables the

drivers. Your software should have an audio device driver setup page, as

well as a MIDI driver setup page.

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M-Audio Digital Recording Interface Delta 44 Spécifications Page 14