The Technical Stuff
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SPDIF Digital I/O
The 2192 accepts incoming 24-bit S/PDIF digital audio signals up to 192kHz from compatible
hardware. The copy-protection, pre-emphasis, and consumer/professional bits are ignored. The SPDIF
input can be used for either digital audio with clock or for digital clock only. When the Clock knob
(
see #3 on page 4
) is set to AES/SPDIF and the Digital Outputs Source Select knob (
see #9 on
page 8
) is NOT set to AES/SPDIF, the audio portion of the signal is ignored.
ADAT Optical Digital I/O
The 2192 provides standard ADAT optical digital inputs and outputs. At sample rates of 44.1kHz and
48kHz, only channels 1 and 2 are used. At higher sample rates, industry standard S-MUX multiplexing
is used to maintain high resolution transfers at higher sampling rates. At 88.2kHz and 96kHz,
channels 1 - 4 are used to carry the stereo signal. At 176.4kHz and 192kHz, all 8 channels are used for
to carry the stereo signal.
Word Clock I/O
Two separate word clock inputs and four parallel word clock outputs are provided for synchronizing
with external hardware. (
see #8, #9, and #10 on page 10
) Connections are via standard 75-ohm
BNC connectors. All input and output signal levels are TTL and CMOS compatible. The word clock
inputs utilize internal 75-ohm terminators and receive standard digital word clock signal for
synchronization (slaving) to external hardware devices. To sync the 2192 to an external word clock
signal, set the Clock knob (
see #3 on page 4
) to Word 1 or Word 2. The 2192 supports subclock
(1/2x or 1/4x) and overclock (2x and 4x) synchronization to allow converting signals at multiples or
submultiples of the sample rate. For example, a 48kHz house sync can be used while converting at
96kHz or 192kHz. Superclock (256x) is not supported; however, vari-speed sync is supported.
Clocking
Combined with its extensive digital I/O, flexible front-panel routing controls, and phase aligned clock
conditioner, the 2192 provides high-quality master clock source and clock distribution for your entire
studio. Its internal digital clock was designed for extreme stability and jitter-free operation, and an
onboard clock conditioner removes jitter from external sources, so conversion quality is unaffected by
clock source. In addition to its internal clock, two separate word clock inputs, as well as clock
embedded within incoming AES/EBU, S/PDIF, and ADAT S-MUX signals, can be used as external clock
sources. Four word clock outputs are provided so the 2192 can be used as a master clock source
without cascading the clock through external devices, which can degrade the clock signal. A prominent
front-panel “Locked” lamp indicates when the 2192 is successfully synchronized to an external clock
source. A/D and D/A conversion is accomplished at any available 2192 sample rate, even if the 2192 is
synchronized (slaved) to an external clock source that is running at a multiple (subclock) or
submultiple (overclock) of the 2192 sample rate. (
see next page for more information
)
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