User Manual

UAX220
User’s manual
13
CONFIGURATION
UAX220 operates by default at an internal sample rate of 48 kHz. In case the
files played back have a different sampling rate, the operating system performs
a real-time frequency conversion.
Under Windows XP (≥SP2) only, it is possible to modify the embedded
firmware version of the UAX220 so that it accepts other internal sample rates:
8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 24 kHz, 32 kHz, 44.1 kHz, 48 kHz.
That makes it possible to work with files at e.g. 44.1 kHz without frequency
conversion.
To use this feature, please download the corresponding firmware update
application at
www.digigram.com/drivers/index.htm. In the ‘Firmware’
section, select ‘UAX220’. Read the instructions on how to use this application
carefully.
Attention: When using this firmware, UAX220 notifies Windows that it is able
to manage sample rates from 8 through 48 kHz. Nevertheless,
UAX220 uses internally the same sampling rate for recording and
playback. This entails, that if an application plays a file at a given
sample rate, and then another application is launched in parallel to
record at another sampling rate, UAX220 will record at the
sampling rate defined by the playback application, whereas the
recording application assumes to work at another sampling rate.
On the other hand, if a recording is already in hand at a certain
frequency and a playback is launched at another frequency, the
output will have the right frequency. To sum up, the audio stream
being recorded or played back first imposes the sampling rate!
With the firmware delivered by default, Windows detects that
UAX220 supports only 48 kHz, and in consequence performs
frequency conversions automatically when it detects that the
frequency required by the application is different from 48 kHz.