Creative Emu 1820m Manual

6 - Using High Sample Rates
Overview
E-MU 1820M/1820/1212M PCI Digital Audio System 111
6 - Using High Sample Rates
Overview
When operating at 88.2k, 96k, 176.4k and 192k sample rates, the mixer functionality 
and number of I/O channels are reduced. These changes are summarized in the 
following tables. All S/PDIF inputs and outputs are disabled at 176.4kHz and192kHz. 
The number of ADAT channels also decreases at the 88.2k/96k and 176.4k/192k sample 
rates (due to the bandwidth limitations of the...

6 - Using High Sample Rates
Overview
112Creative Professional
E-MU 1212M System at 88.2k or 96k (1010 PCI Card & I/O Card) 
When using the E-MU 1212 system at 88.2kHz or 96kHz you have two analog inputs 
and outputs and two S/PDIF inputs and outputs. The ADAT input/output channels are 
reduced from eight to four using the S/MUX standard. 
E-MU 1212M Inputs/Outputs at 88.2kHz or 96kHz
SourceInputsOutputs
ADAT44
S/PDIF22
Line22
Total88
ADOCK
ADOCK
4 Chan.
4 Chan.
4 Chan.
Input/Output - 88.2 kHz/96 kHz
ADAT...

6 - Using High Sample Rates
Overview
E-MU 1820M/1820/1212M PCI Digital Audio System 113
E-MU 1820 System at 176.4kHz or 192kHz 
(1010 PCI Card & AudioDock) 
At the highest sample rate you have 4 inputs and 10 output channels.
There are four possible input configurations when using the E-MU 1820 system at 
176.4kHz or 192kHz. Each of the three options provides four input channels.
S/PDIF is not specified to operate at  176.4kHz/192kHz and so all S/PDIF inputs and 
outputs are disabled. The headphone output...

6 - Using High Sample Rates
Overview
114Creative Professional
or…
or…
Microphone & Line 3 Input enabled
Line Input 1 & ADAT Input enabled
Line Inputs 1 & 3 enabled
2 Chan.
ADOCK
2 Chan. 
2 Chan. 
ADOCK
ADOCK
2 Chan. 
or…
Microphone & ADAT Input enabled
2 Chan.
ADOCK
2 Chan. 
At the 176.4kHz or 192kHz sample rates, you sacrifice S/PDIF, line input 3, and line output 3. 
ADAT optical is reduced to two channels. You can choose one of the following options:
• Microphone Inputs & Line 2 Inputs  • Line Inputs...

6 - Using High Sample Rates
Overview
E-MU 1820M/1820/1212M PCI Digital Audio System 115
Example: Selecting a 176/192k Session 
The possible input configurations are selected by choosing a session template 
containing the desired I/O from the New Session window. Once you have selected one 
of the three session types, you will not be able to change to another type without 
starting a new session.
1.Select New Session from the PatchMix DSP toolbar.
2.Choose the 176k/192k tab.
3.Select the Template that...

6 - Using High Sample Rates
Overview
116Creative Professional 

7 - Appendix
Sync Daughter Card Supplement
E-MU 1820M/1820/1212M PCI Digital Audio System 117
7 - Appendix
Sync Daughter Card Supplement
SMPTE Conversion

Warning: SMPTE and 
MTC do not provide 
sample sync for digital 
I/O. You must use Word 
Clock, S/PDIF or ADAT 
sync.One of the main functions of the Sync Daughter Card is to convert SMPTE (LTC) to 
MIDI Time Code (MTC) and vice-versa. The term “Host MTC” refers to MTC, which is 
generated or used by the host application (Cubase, etc.). MTC is also...

7 - Appendix
Sync Daughter Card Supplement
118Creative Professional
SMPTE Modes of Operation
Host Mode
The host computer is the source of synchronization. MTC messages are sent to the Sync 
Daughter Card from the computer application and converted into SMPTE. MTC is also 
output from the MIDI port on the Sync Daughter Card.
External Mode
SMPTE messages from SMPTE In are converted to MTC (quarter-frame messages) and 
sent to the host application. This happens automatically whenever LTC is received at the...

7 - Appendix
SMPTE Background
E-MU 1820M/1820/1212M PCI Digital Audio System 119
Stripe Mode
This mode is used to record SMPTE time code onto an audio track of another recorder. 
SMPTE is output when the Start button is pressed in the System Settings menu and 
begins at the time set by the Start Time setting. MTC is also simultaneously output from 
the Sync Daughter Card MIDI out. SMPTE and MTC will continue to be output until the 
Stop button is pressed. See Striping SMPTE
.
SMPTE Background
SMPTE time...

7 - Appendix
SMPTE Background
120Creative Professional
time! (A one hour program would actually be 59 minutes and 56.4 seconds long.) Drop 
frame was designed to correct this time difference. In 30 Drop Frame, every minute 
except 00-10-20-30-40-50 have the first two frames, 00 and 01, “dropped”, hence the 
name drop-frame.
Why use SMPTE?
SMPTE sync, although well over 30 years old, has the advantage of being able to be 
recorded as an audio track. This allows it to be used with virtually any kind of...