DCS Digital to Digital Converter Benutzerhandbuch
dCS 974 User Manual
Manual for Software Version 1.0x
dCS Ltd
May 2001
Manual part no: DOC1241121A1
Page 121
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
Output audio bandwidth is low.
• During sample rate conversion, the signal is digitally filtered - this is
essential for good performance. The output audio bandwidth will usually be
slightly less than half the lowest sample frequency involved in the
conversion.
slightly less than half the lowest sample frequency involved in the
conversion.
A stereo output signal is expected but signal is present on one channel only.
• Check
that
Balance
is not set to one side.
• If PCM SDIF-2 or DSD SDIF-2 is used, check that
CH1 OUT
and
CH2 OUT
are both connected.
• Check you are not using a Dual AES mode with just one cable connected.
A stereo output signal is expected but one channel of the input appears on both
channels of the output.
channels of the output.
• Check that the receiving unit expects two wire AES or SPDIF mode, rather
than double speed, single wire.
Tone appears on the outputs.
• Press
the
Status
button and check that the
label is NOT visible. If
it is, select
Test Mode
and set the
Test Generator
to
Off
.
• Low level “idle tones” sometimes appear on the outputs if the signal on the
input drops to a level below the output word length and
Noise Shaping
is
on with no
Dither
. This may arise during editing sessions, for example,
where digital silence is coming in to the unit, but the
Detect Silence
function is off. This situation will usually not arise if an unedited input from
an ADC is being used, although even in these circumstances, enough noise
shaping must be used. Consider using either
an ADC is being used, although even in these circumstances, enough noise
shaping must be used. Consider using either
Dither
or
Detect Silence
or
both.
The LCD display is unreadable but the
Power
LED and possibly some other LEDs are lit.
•
Display Contrast
may have been set to minimum. Switch off the unit, wait
10 seconds, hold down the
Status
button and switch on. The unit will power
up using default settings, including high contrast. Alternatively,
Store A
is
pre-loaded with default settings. Press
Recall
slowly twice, then press
Enter
to recall from it.
Strange characters appear on the LCD display.
• This can be caused by power line drop-outs or switching the unit off and on
rapidly. Switch off, wait 10 seconds then switch on - normal operation
should be resumed.
should be resumed.
The stereo image is poor or out of position.
• Check
that
Phase
and
Swap Channels
are set to
Normal
.
• Check
that
Balance
is correctly set.
• It may be that the input signals are out of phase, swapped or out of
balance. Use the units controls to correct this.
• If using the DSD/SDIF interface, the
CH1
&
CH2
cables may be swapped.
• If you are using a Dual AES or Quad AES mode from some other
equipment, make sure you used the right outputs from that.
Maximise fails to increase the signal level to full scale.
• The range of the
Maximise
function is limited to +12dB. If the input signal
peaks are smaller than -12dB0,
Maximise
will apply +12dB of gain. A
second pass will apply up to 12dB more gain.