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See also the fold-out front and rear panel diagrams at the end of this manual.
POWER BUTTON
Press for power on. Press again for power off.
SAMPLE RATE
Selects the sample rate (sampling frequency) for the digital outputs and word clock output to either 44.1 kHz
or 48 kHz (the upper two LEDs are unused). The Rosetta 96 also includes 88.2 kHz and 96 kHz selections and
uses the upper two LEDs.
Tips
•
Select 44.1 kHz to record to Compact Disc (CD-R).
•
Some consumer DAT recorders can only record at 48 kHz.
•
The default sample rate for recording on the original Alesis ADAT ('black face') is 48 kHz.
•
Please consult the respective equipment manuals for any limitations on sample rate selections.
Most recording devices will automatically lock to the incoming sample rate when "digital input" is selected. If
your device does not automatically do so, manually select the same sampling rate for both the Rosetta and the
recording device and/or configure the receiving device to clock from its digital input.
Recording equipment will only accept 88.2 and 96 kHz sampling rates if equipped to do so. 88.2
and 96 kHz signals are supplied using the two industry-accepted methods. In 'double-wire' (also
called 'double-wide') mode, the high resolution signals are supplied via the Rosetta's AES outputs
– the left channel via AES 1 output and the right channel via AES 2 output. To configure the Rosetta for
double-wire mode, place DIP switch 6 in the UP position. The other transmission method for 88.2 and 96
kHz signals is the 'single-wire' (sometimes called 'double-fast) method. This method uses only one AES (or
S/PDIF) output for transmission of both the left and right channels, similar to the AES3 standard widely
used for normal 44.1 and 48 kHz signals. To configure the Rosetta for single-wire mode, make sure that
DIP switch 6 is in the DOWN position. Check your recording device to see whether it uses the double-wire
or single-wire mode.
While the Rosetta is set to 88.2 or 96 kHz sampling rates and the unit is configured for double-wire oper-
ation, the S/PDIF coaxial and optical outputs will output every other sample. So, for example, if the
Rosetta is set to 96 kHz, the S/PDIF outputs will output 48 kHz audio. Keep in mind that this audio has
not been converted from analog using the proper filters for 44.1/48 kHz sampling rates. Therefore, the
audio output from the S/PDIF outputs while in double-wire 88.2/96 kHz mode may have aliasing compo-
nents and therefore should be used as a quick reference only. We recommend that you do not use the
S/PDIF outputs as the main output feed while in 88.2/96 kHz mode. While the Rosetta is in 88.2/96 kHz
sampling rate and the unit is configured for single-wire operation, the S/PDIF coaxial and optical outputs
will deliver single-wire 88.2/96 kHz.
RESOLUTION
Selects the word length (also referred to as bit rate or resolution) for the digital output. Note that the Rosetta
always converts analog to digital at 24-bit resolution.
To output a 16-bit or 20-bit signal, the UV22HR process can be applied by selecting '16-bit UV22' or '20-bit
UV22' respectively.
Rosetta AD User's Guide
The Front Panel
Page 12
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