User`s guide

Audio Behavior 101
Audio
Behavior
Audio Behavior
Power-Up Operation
The DVM2 decides at power up what type of audio (MPEG or Dolby
Digital bitstream) and at what audio bit rate to play. It does this by checking
the dvm.ini file for MPEG vs. AC3, then if in MPEG mode, auto-detecting the
audio rate of file 0 (either an automatically executed clip or the first clip played
by a playlist). If there is no file 0, then the unit finds the lowest numbered video
file on the drive and determines its audio type. (If the lowest numbered file on
the drive is a very large number, it can take a while to find it. We suggest using
file number 1 for this purpose.) If there are no numbered files, then the
autodetect feature is engaged the first time that a file is played, and then it turned
back off again.
Audio Formats
After this power-up operation, all files will be played using these parameters,
unless the parameters are manually set using the AR command, or unless the
autodetect feature is turned on. Please note that when autodetect is on, the
playback of every file will be delayed by a fraction of a second while the DVM2
determines its audio settings.
Set Audio Rate:
0AR<cr> Autodetect On
1AR<cr> Sample Rate = 32KHz
2AR<cr> Sample Rate = 44.1KHz
3AR<cr> Sample Rate = 48KHz
4AR<cr> AC3 mode, Stream ID (SID) must = 80
5AR<cr> Go back to MPEG Audio Mode, set sample rate and SID from next
clip that is searched. (Thus is different from 0AR, in that it keeps
that setting after the first search)
Get Audio Rate:
AR<cr>
Response Format: Current Audio Rate prefix : Audio SID
For Example:
1:C0 – The 1 means you are at 32KHz and the C0 denotes a SID of C0
2:CC – The 2 means you are at 44.1KHz and the CC denotes a SID of CC
3:DC – The 3 means you are at 48KHz and the DC denotes a SID of DC
4:80 – The 4 means you are at 48KHz and the 80 denotes a SID of 80 in AC3
mode.
If you have just told the DVM2 to auto-detect, the response is the set of freq and
SID the DVM2 currently has. They will be changed during every search.