Sivakatirwami,
You've gotten some good feedback already. We use the iMic with
Plantronics A-90 headsets to do audio recording. The quality is fine.
Once you have set the audio input in System Preferences, you don't
need Rev to do that any more. It becomes troublesome anyway, since
your users may not all have the same USB device, which the system would
list, and I have not found a way in Rev to go out and poll for the
options.
There are three things I would suggest looking into:
set the recordSampleSize to 16 -- 8 just sounds scratchier and tinnier
As Tom said, "mp4a" may not be the best (or even any) choice for
compression.
Although QuickTime Pro can compress files with that codec, I am not sure
it is available for other applications (like Rev) to use. I have
realistically only
been able to compress audio from within Rev with IMA 4:1. The two MACE
options are scratchy,
and Qualcomm sounds hollow, but it's usable. Perhaps you can just save
the files
with no compression and use QuickTime to compress them as mp4a files...
BTW, the recordFormat property only deals with file types. From the
docs:
Value:
The recordFormat is one of the following:
aiff records a file in AIFF format
wave records a file in WAV format
ulaw records a file in AU format
movie records a file in QuickTime format
So, that would not be where you set the compression. Use the
recordCompression property instead.
Finally, if you use any compression at all, you cannot use the "play"
command in Rev to play it back. You just get screeches. Use a QuickTime
player instead. Set the filename of the player to your tSoundFile and
play it pack through the player.
set the recordRate to 22.050 --the uSampleRate of me
set the recordChannels to 1 --the uRecordChannels of me
set the recordSamplesize to 8 --the uSampleSize of me
set the recordFormat to "mp4a" --the uRecordFormat of me
if fld "soundFileName" is empty then
answer "You need to set a sound file name." with "OK"
exit mouseup
end if
if the short name of me = "Record" then
set the recordInput to "dflt"
HTH,
Dan
Daniel B. Soneson
Director, Language Lab
Southern CT State University
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