Operation Manual

1212 I/O Utility
Korg 1212 I/O 25
English
Word Clock & Sample Rate
Clock Source
When connecting multiple digital audio devices–such as the 1212 I/O, an
ADAT system, and a S/PDIF device–it is important that the word clocks of
the devices be locked together. If the clocks are not locked, the audio may
be marred by pops and clicks. The 1212 I/O can lock to incoming clocks
from any of its digital inputs, or it can generate its own clock. For more
information, see “A few words on word clock,” on page 20.
You will need to select different clock sources from time to time, depending
on what you are currently doing with the 1212 I/O; see the section
“Applications,” on page 32, for details.
ADAT. The ADAT optical input will provide the master word clock.
S/PDIF•ClockIn. This is a dual-purpose setting, which depends on
whether or not a device is connected to the Word Clock input.
If an external clock source is connected to the Word Clock input, and is
generating a word clock signal, then it will be used as the master word
clock source.
Otherwise, the S/PDIF input will provide the master clock.
Internal. The 1212 I/O’s internal clock will be the master. With this setting,
the Sample Rate parameter, below, controls the clock.
Sample Rate
This parameter has two functions. First, it sets the clock rate when the
Clock Source parameter, described above, is set to Internal. Second, it sets
the sample rate information embedded in the S/PDIF output data, which
in turn sets the sample rate of any connected S/PDIF devices.
When transferring audio from the ADAT inputs to S/PDIF output, it is
important to set this parameter so that it matches the sample rate of the
ADAT. Since original ADATs used their pitch controls to choose between
48kHz and 44.1kHz, the 1212 I/O cannot be sure of the sample rate of
ADAT input. Setting the Sample Rate parameter lets the S/PDIF device
know what rate to expect. If this parameter is set incorrectly, the connected
S/PDIF device may not function properly.
44.1 kHz. The internal sample rate and S/PDIF output will be set to
44.1 kHz.
48 kHz. The internal sample rate and S/PDIF output will be set to 48 kHz.
Analog Input Trim
Left
0dB to -78dB, OFF. This allows you to attenuate the analog input
sensitivity of the left channel, prior to the A/D conversion. At the