M-Audio Delta TDIF Инструкция по эксплуатации онлайн [13/58] 19006

with the mixer’s output recorded into the user’s application software.

The digital audio mixer is configured and controlled by the included

Delta Control Panel Software.

The Patchbay / Router

In addition to the built-in monitor mixer, the Delta TDIF PCI Audio Card

includes an output patchbay/router. The patchbay/router allows each

output (analog or digital) to be connected to a variety of input sources.

The Delta TDIF’s outputs may accept audio from software sources (these

output devices are visible in your audio software applications) or from

hardware sources such as the analog and digital inputs (TDIF or S/PDIF),

or the monitor mixer. This capability makes the Delta TDIF quite flexible

for WAV or AIFF output, monitoring, or directly connecting inputs to

outputs for system test purposes.

Synchronization

For proper operation, the entire Delta TDIF system is always

synchronized to a single master clock. The master clock is chosen via the

Delta Control Panel software, and this clock may be derived from the

Delta TDIF’s internal crystal oscillators, S/PDIF In, or TDIF In. Much of

the time, the master clock is taken from the internal crystal oscillators.

However, the S/PDIF and TDIF options are used in situations where the

Delta TDIF must be synchronized to external digital audio or sample

rates derived from an external device.

Using the initial default setting, the master clock is derived from the

internal crystal oscillators. Operation in this mode is similar to that of a

generic sound card – for instance, when a WAV or AIFF file is played

through the Delta drivers, the software application playing the WAV or

AIFF file is responsible for setting the sample rate in the sound card

hardware. The Delta TDIF supports these sample rates by using either of

its internal crystal oscillators and dividing the rate of that oscillator by

some value to derive the proper sample rate.

In situations where S/PDIF In is being used, the Delta TDIF Audio Card

must be configured to get its master clock from the S/PDIF In data

stream. The reason for this is simple – a S/PDIF data stream coming from

an external source is rarely going to be in sync with the Delta TDIF card

(or other digital audio devices in the system for that matter), even if the

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

internal crystal, then the incoming S/PDIF audio would have "pops,"

"crackles," and other undesirable audio artifacts present in it. Instead,