User manual

dCS 950 / 952 User Manual Manual for Software Version 6.2x
dCS Ltd 22
nd
May 2000
Manual part no: DOC0029526B1 Page 22 Document No: OS-MA-D0002-952.6B1
Contact dCS on + 44 1799 531 999 email to: [e-mail]
(inside the UK replace + 44 with 0) web site: www.dcsltd.co.uk
I-For -
Sets the AES multi-wire Input Format. As dCS 950 does not feature multi-wire
interfaces, it has 2 options which are essentially the same:
Auto The message flags on the selected input are
checked and the format is automatically set to
Single AES.
US[1] User-selected Single AES mode.
dCS 952 has 3 options:
Auto The message flags on the selected input are
checked and the format is automatically set to
Single or Dual AES. A Dual AES source must be
correctly connected to AES 1 & 2.
US[1] User-selected Single AES mode.
US[2] User-selected Dual AES mode.
In Dual AES mode, the unit will warn you of missing wires with a display like 1-
(AES2 not connected). Swapped wires are displayed as 21 (AES1 & 2
swapped). The checking relies on correct messaging and may not work with
non-dCS equipment.
You can over-ride any setting using the Input Selector buttons.
Filt -
Selects one of several anti-image
3
filter responses. The filters should be
evaluated by ear. Filt1 gives the sharpest cut off, just below half the sampling
frequency. This is the normal setting. Filt2, Filt3, Filt4 give progressively more
relaxed responses, slightly degrading the Nyquist image performance but
sharpening the impulse response. This affects the stereo or multi-channel
image. Different filters may be appropriate for different material.
A typical audio signal contains very little signal energy above 10kHz, so there is
some justification for relaxing the filter attenuation as 20kHz is approached,
especially at higher sample rates.
The unit stores a different Filter setting for each sample rate.
BNC I -
This feature is available on the dCS 954 only – it is permanently set to SDIF.
3
Nyquist images, not stereo images. These are reflections of the pass-band spectrum about Fs/2 caused by
any digital-to-analogue conversion process. They must be filtered out by the converter.