DAC1 USB
Instruction Manual Revision D Page 8
Sample rate is determined by measuring the
incoming signal. Lack of sample rate status
bits or incorrectly set status bits will not
cause loss of audio.
Error Display
When the selected digital input signal is
disconnected, incompatible, or drops out, the
Input Status Display will flash indicating a
signal error. This flashing will stop when the
error is corrected. If the error persists for
more than 15 seconds, the DAC1 USB will
enter Standby Mode.
Automatic Standby/Resume
The DAC1 USB features an automatic
standby mode that eliminates the need to
turn the converter on and off. Standby
Mode starts 15 seconds after a digital source
device is turned off, disconnected, or contains
errors that prevent D/A conversion. All LED’s
are off while in standby mode.
While in Standby Mode, the DAC1 USB
continues to monitor the selected digital input
and will immediately resume normal
operation when an error-free signal is
restored.
Low-Noise Internal Power
Supply
The internal power supply supports all
international voltages and has generous
margins for over and under voltage
conditions. It has excellent immunity to noise
on the AC line and no external AC filtering is
required.
Phase-Accurate Multi-Track and
5.1
The DAC1 is phase-accurate between
channels at all sample rates, and is phase
accurate between any combination of DAC1
and DAC1 USB converters at sample rates up
to 96 kHz. Phase-accurate multi-track and
5.1 surround systems are easily constructed
using multiple DAC1 and/or DAC1 USB
converters.
Automatic Digital De-Emphasis
Pre-emphasis was used on many early CD
recordings. It is rarely used on newer
recordings and consequently some D/A
converters omit de-emphasis. The DAC1
USB will correctly apply precise digital de-
emphasis when and if it is needed. The de-
emphasis circuit supports 44.1, 48, 88.2 and
96-kHz sample rates and is automatically
enabled in response to the pre-emphasis
status bits in consumer format digital signals.
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