DCS dCS 974 User Manual
dCS 974 User Manual
Manual for Software Version 1.0x
dCS Ltd
May 2001
Manual part no: DOC1241121A1
Page 120
Document No: OS-MA-A0124-112.1A1
Contact
dCS
on + 44 1799 531 999
email to: more@dcsltd.co.uk
(inside the UK replace + 44 with 0)
web site: www.dcsltd.co.uk
T
ROUBLESHOOTING
FAQs
The unit fails to lock to a source signal.
• Check
that
Audio Input Select
is set to the correct input.
• Check
that
Input Sample Rate
is either set to
Auto
or set to suit the
source device.
• Check
that
Sync Source
is set correctly - try setting it to
Audio Input
.
• Check for damaged cables.
The unit locks but no signal is received.
• Display
the
Bit Activity Monitor
to see if a signal is available at the unit. If
there is no signal into the unit, and
Detect Silence
is on, there will be no
signal out – even with
Dither
and
Noise Shaping
on.
• If the unit is locked to an external clock, check that
Audio Input Select
is
set to the correct input.
• If SDIF-2 is used, check that
CH1 IN
and
CH2 IN
(upper block)
are both
connected.
The destination device fails to lock to the unit.
• Check that the unit is locked to a source.
• Check
that
Output Sample Rate
and
Output Mode
suit the settings on
the destination device.
• Ensure the destination device is set to sync to the dCS 974 and not to a
Master Clock.
• Ensure the destination device is capable of locking to the selected
Output
Sample Rate
.
• Check for damaged cables.
The destination device locks but no signal or just noise is received.
• Display
the
Level Meters
to ensure signal is present on the outputs.
• Check that the
Test Generator
is off by pressing the
Status
button.
• Ensure the destination device is set to sync to the dCS 974 and not to a
Master Clock.
The destination device connected to the AES or SPDIF outputs reports an error.
• Check that AES and SPDIF Messages are correctly set up.
• Check for damaged cables.
• Check that the destination device can receive the sample rate the dCS 974
is putting out, in the appropriate (1 wire, 2 wire, 4 wire) format.
Output audio quality is poor.
• Check
that
Output Wordlength
is set correctly.
• If truncating from 24 bits, use
Noise Shaping
and/or
Dither
.
• Ensure the unit is locked to the source device or an external clock driving
the source device.
• Converting from a very low sampling rate to a high sampling rate cannot
give sparkling hi-fi performance, although it can improve things a bit (the
“upsampling” phenomenon). The dCS 974 can convert a 12 kS/s, 8 bit signal
up to 192 kS/s, 24 bit in real time but the linearity will be poor due to lack of
source information, the noise floor will be high and the audio bandwidth will
still be 5kHz (i.e. not much better than a telephone line).
“upsampling” phenomenon). The dCS 974 can convert a 12 kS/s, 8 bit signal
up to 192 kS/s, 24 bit in real time but the linearity will be poor due to lack of
source information, the noise floor will be high and the audio bandwidth will
still be 5kHz (i.e. not much better than a telephone line).