14
PCI-822 User’s Guide
— Sample Rate —
In this section, a drop-down box lets you select
the expected sample rate (44.1 or 48kHz). If
the ‘Lock’ box is checked, then applications can only use the selected
sample rate. For example, if the sample rate is locked at 48kHz
and you try to play a 44.1kHz sound, an error message appears
(although it may not clearly state that the sample rate is incorrect).
The Sample Rate section also displays the actual current sample rate
as measured by the computer.
It’s normal for the actual rate display to vary over time, since the
computer timer used for the measurement is not very precise.
A variable actual rate display does not mean that your audio clock
is unstable.
— Digital Input Status —
This section displays the audio input status in the form of error
indicators, and shows which input channels are in use.
On the left are three rectangular error indicators
for each of the PCI-822 inputs (TDIF and Coax).
A red indicator represents an error, and green
means “good to go.” A slash across a green indicator means that
at least one error was detected since the errors were last cleared.
To remove all slashes, click ‘Clear Errors.’
From left to right, the indicators are:
Signal green = input signal active
red = input signal inactive
Format
(Fmt)
green = valid digital audio format detected
red = error in digital audio signal format
Slip green = the PCI-822 is locked to incoming audio clock
red = the PCI-822 sample rate is different than the
incoming audio clock
