MARENIUS ELEKTRONIKUTVECKLING AB |
www.marenius.se
|
www.marenius.com
|
www.audiodesign.pro
4/4/2014 MM-4240 User Manual v.2.00
20
11. Recording with the MM-4240
The MM-4240 can record up to 6 tracks @ 24bit, 96 kHz.
The recorder has its own dedicated 5 way navigation switch.
The recorder can record on SDHC and SDXC cards formatted to the FAT32 standard.
The files are stored in the root directory of the SD card named RECxxxxx.WAV where xxxxx is
a number; the number will automatically increase one unit for each track.
The tracks are stored in polyphonic BWF format. The BWF format is fully compatible with PCM
wave. For more information regarding BWF see
http://www.ebu.ch
.
11.1. SD cards
The SD card socket is located below the display and is a push-push socket. The SD card
should be placed in the socket
faced down
. There are many different types of SD cards on the
market. Each SD card has an internal controller, a flash memory and a buffer memory. The
speed class of the SD card specifies the average writing speed to the card when writing optimal
buffer sizes. However the speed class doesn
’t have anything to do with access times, even if
two cards looks the same on the outside they may have different internal chips. The MM-4240
has an internal buffer size of 24.576MB which is equal to 10.66 seconds when recording 6
channels at 24bit, 96 kHz. This means that the SD card must have a faster access time than
10.66 sec and be able to empty the buffer faster than new samples are added to the internal
buffer. The FAT32 standard specifies a maximum file size of 4GB which means that the MM-
4240 has to split the recording if the file size is larger. The file size can be set to other sizes
than 4GB using the menu. When the file size is exceeded, the MM-4240 writes out file
information which will take some time depending on the file size and the random access writing
speed of the card. If the buffer size isn’t exceeded during this time the MM-4240 will be able to
split the files sample correct. Sample correct recordings can easily be merged during the post-
production phase. If the buffer size is exceeded there will be sample loss between the files.
If the MM-
4240 doesn’t accept the card placed in the socket the red LED on the front panel will
flash rapidly.
The user is able to view the current buffer usage when holding down the info button in recording
mode. Under device info in the menu the maximum buffer usage since power on can be
viewed. If the maximum buffer usage is 100% the SD card is too slow for the record setup being
used.
Normally SD cards can be formatted into FAT32 directly under windows, however when using
larger SDXC cards a formatting utility must be used. A free copy of
EaseUS partition master
can be downloaded from
http://www.easeus.com/download/epmf-download.html.
Important notes on SD cards:
1. Do not store any other files than the recordings made by the MM-4240 on the card.
2. Always begin with a clean card.
3. Format the SD card into FAT32 only.
4. SD cards are electrostatic sensitive.
5. Do not delete single files on the cards this will end up in corrupt recordings.
6. If the card is fragmented the recordings will be corrupt.
7. Do not remove the SD card when recording or playing tracks
