OWNERS MANUAL FOR WEISS DAC202 D/A CONVERTER
Page
21
Date: 03/10
The signal routing in various DAC202
operation modes, i.e. the insert mode
and dual wire mode as well as
synchronization options
This paragraph describes some advanced features of the
DAC202: The Insert mode, the Dual Wire mode and
external synchronization via Wordclock on the BNC
connector or via the other digital audio inputs.
There are four basic modes which specify the input
source for the DAC:
1. FireWire
2. AES (XLR)
3. SPDIF (RCA)
4. SPDIF (TOSLINK) – note: up to 48kHz sampling rate
only!
The respective input source is routed to all possible
output destinations (FireWire, XLR, RCA, DAC chip) as
well as to the
APB
(ARM processing buffer) for the bit
transparency check.
When the Insert mode is engaged, the input source is
not routed to the DAC chip, the DAC chip receives its
signal from a secondary input instead. See Insert routing
below. This allows the user to insert an external
processing stage into the audio stream, e.g. a digital
equalizer. The secondary input (so called insert return) is
selected within the config menu.
Each basic mode can be operated in either:
- Single Wire:
L & R channels on a single AES/EBU or
S/PDIF cable (the normal mode).
or
- Dual Wire:
L & R channels on two separate AES/EBU
or S/PDIF cables. If the Dual Wire mode is activated it is
active only with sampling rates of 176.4 or 192 kHz.
With all other sampling rates the DAC202 automatically
switches to Single Wire mode. Dual wire mode is useful
for digital audio equipment connection to the DAC202
where the units only support the high sampling rates
(176.4 / 192 kHz) in dual wire mode.
Besides the inputs as sync sources, Wordclock (“sync”)
input/output on BNC connectors are available. The
applicable Wordclock rate for Dual Wire mode is
configurable to be:
halfrate (88.2/96 kHz) or
audiorate (174.6/192 kHz)
Mode: Firewire input / single wire / no insert
- The Firewire input is routed to: DAC chip, XLR out, RCA
out, APB.
- The Firewire output (going to the computer for
recording) is fed from the source specified as the sync
source:
