Date printed: 24.01.12
19
D21m System
5.5.1 additional SrC delay
Enabled input and output SRCs each cause an additional delay (D) depending
on the input and output sampling rates (f
S_IN
and f
S_OUT
).
Input and output delays can be calculated using the following formulas:
[2]
f
S_OUT
> f
S_IN
:
D =
48
f
S_IN
[s]
[1]
f
S_IN
> f
S_OUT
:
D =
16
f
S_IN
+
[s]
32
f
S_OUT
Examples
For a 96 kHz input signal and a 48 kHz system clock (i.e., the input SRC’s
output), the input delay is 40 output samples or 833 µs (formula [1]).
For a 48 kHz system clock (i.e., the output SRC’s input) and a 96 kHz output
signal, the output delay is 96 output samples or 1 ms (formula [2]).
5.5.2 additional Processing delay
Processing Block
Compact SCore
SCore Live
***
Comment
Limiter
1 ms
-
if active
Monitoring Module
1 sample
-
Signal path,
e.g. to phones out
TB Sum / Monitor Sum
5 samples
5 samples
Core-Core MADI Link
17 samples
17 samples
Insert Send
5 samples
5 samples
Output Sum
*
16 samples
13 samples
Program Output
**
5 samples
5 samples
Assignable Process
-
5 samples
e.g. fader,
stereo -> mono
*
Delay from a channel input to a summing output
**
Delay from a summing output to a master/group output
***
Independent from the sampling rate (48 or 96 kHz)
5.6 The MadI Interface: 64 or 56 Channels?
The D21m I/O system is fully supporting the MADI protocol of 56 channels
(standard MADI) as well as 64 channels (not supported by all third-party
MADI devices). Protocol selection is done on the front panel switch of the
MADI I/O card. Between a D21m hub and a D21m remote I/O box always
64-channel format should be selected, since the MADI HD card in the remote
I/O box expects the 64 channel protocol.
Note
The protocol switch on the front panel of the MADI I/O card is not related to
the channel count setting by the DIP switch on the card itself. In other words,
you possibly only use 32 MADI channels (determined by DIP switch), but
you nevertheless have to select whether the standard MADI protocol (‘56
channels’) or the extended version is used. The correct setting of the protocol
switch on the front panel is purely depending on the third-party equipment
connected to that MADI interface.
