M-AUDIO DIO2448 - Manual (Page 3)

About the DiO 2448
The DiO 2448 inputs and outputs support digital audio streams as wide as
24 bits, the highest resolution available at this time of printing. At sample
rates of up to 48kHz, the DiO 2448 S/PDIF inputs may record a digital signal
from your DAT, MiniDisc, CD player, or external A/D converter. The
DiO 2448 S/PDIF and Analog outputs may be used to monitor the incoming
S/PDIF signal or to output digital audio from your software applications.
Below is a simplified block diagram of the DiO 2448. Please reference this
diagram while reading the remainder of this section.
Basically, the DiO 2448 appears to your software as a stereo-input, stereo-
output (2x2) audio card. There are three inputs to the card that may be
recorded: Optical S/PDIF, Coaxial S/PDIF and internal CD-ROM S/PDIF.
As you can see from the DiO 2448 block diagram the Optical and Coaxial
S/PDIF streams are merged into one audio stream. This is not a true digital
mixer, but instead a non-intelligent merger that combines the raw data
streams. Therefore, only one of these jacks should be connected to an active
signal at a time. Note also the CD-ROM S/PDIF header is wired directly to
the Coaxial S/PDIF jack. In most cases, utilizing the internal CD-ROM
S/PDIF header will prevent you from using the Optical and Coaxial S/PDIF
inputs. Therefore, this header is primarily for using your DiO 2448 and
computer as a “dedicated CD-ROM recording station” and not for recording
from external S/PDIF devices.
3
S/PDIF-In
Format
Monitor
S/PDIF-In
at
Analog-Out
Software
WAV
Recording
Software
WAV
Playback
Analog
CD
Inputs
Optical
Coax
S/PDIF
Outputs:
Analog
Outputs
S/PDIF-Out
Source
Master
Volume
Optical
Coax
CD
S/PDIF
Inputs:
+
+
CD
Control Panel Options
WAV