Microcassette Recorder User Manual

Audacity
©2008 Audacity Audio
Page 28 of 31
Recording Times and Considerations
Compression Setting
Maximum Available
Recording Time
(hh:mm) (Based on
64MB SD Card)
Approximate
Filesize for 10
minute recording
Comp 6 (All) 21:32 495 KB
Comp 11 (Tungsten T, T2 and Treo 600 only) 12:03 615 KB
Comp 12 (T, T2, T3, C, Zire 72, Treo 680, Treo
650, Treo 700P, Centro and LifeDrive)
10:46 990 KB
Comp 24 (T, T2, T3, C, Zire 72, Treo 680, Treo
650, Treo 700P, Centro and LifeDrive)
6:01 1.77 MB
PCM @ 8kbps Sampling Rate (All) 1:06 9.6 MB
PCM @ 11kbps Sampling Rate (All) 0:48 13.23 MB
PCM @ 16kbps Sampling Rate (All) 0:33 19.2 MB
PCM @ 22kbps Sampling Rate (All) 0:24 26.46 MB
Compressed 11 uses nearly all of the Tungsten T and Treo 600's processing power. Consequently, the
duration clock update can be erratic at times. It is smoother with PDA’s with faster processors, and also
better with internal memory.
PCM 22kbps also stresses the system. It has to write a lot of data to the SD card. If you have a slow card
or if your particular PDA writes slowly, you could have a problem. We have also seen this with PCM
16kbps, but it is not as prevalent. Our advice is to experiment and see which settings you like. Also see
the following section for more ideas.
Speech Recognition Considerations
If you intend to process the files created by the Audacity Digital Voice Recorder through third-party
speech recognition software (Dragon Naturally Speaking, ViaVoice, etc.), the following guidelines will help
you to achieve excellent results.
Experiment with the sampling rate. In theory PCM 22kbps should give you the best results, although the
file size gets very large. We have had some problems with PCM 22 as mentioned in the preceding
section. Also, PCM 22 is very sensitive to noise. Reducing the Mic sensitivity can minimize the problem.
We suggest trying PCM 16kbps or PCM 11kbps.
The default Mic sensitivity is set for 7 (on a scale of 1 to 10). Seven works well if you hold the PDA 12 to
15 inches from your mouth. In a noisy or mobile environment this will probably pick up too much noise for
good speech recognition. Try changing the setting to 3 or 4 and holding the PDA one inch from the corner
of your mouth like a headset Mic would be positioned. This will minimize the outside noise.
Find a sampling rate and a Mic sensitivity setting that works well for you and your unit, and then stick with
it. Make sure to hold the PDA at the same position each time you record. Consistency is the key. If you
follow these guidelines, Audacity will give you excellent results. Audacity Professional is a certified
product with Dragon Naturally Speaking.
Audacity Communicator
Audacity Communicator is a new service of Audacity Audio. It uses the Audacity Pro as one of the
components of a new way to easily communicate with your office, secretary, transcriptionist, etc. It uses
the cellular network as a wireless conduit to your office. It is absolutely the easiest way to communicate to
your secretary from the field. Just record and forget it. A message pops up on your secretaries desk.