Step 5 - setting the recording parameters
The default mode of SAP2 is sound-amplitude triggered recording. You should decide
what parameter values would provide you with the best results. You can set those
parameters in the Recording tab:
SAP2 keeps recording into a memory ring buffer, which allows you to have a recording
session starting prior to triggering by amplitude. For example, setting"Pre-threshold
recoding duration" to 477ms will generate sound files that start 477ms before the bird
started to sing.
Recording then continue for the duration specified in the "Post-threshold recording
duration" -- or longer. Each time sound amplitude is above threshold, this timer is reset
to zero. In the case above, recording continues 1000ms after the trigger. If during that
time trigger has passed again, this clock is reset (and recording will continue for
additional 1000ms). However, when recording passed "Maximal recording duration"
(30000ms in the example above), recording stops and sound file is save to the hard disk.
Once the sound was saved to a temporary folder, the recorder "decides" if to accept or
reject it based on the number of times threshold was crossed during the recording session.
In the example above sound where threshold was crossed 1000 time or more are saved,
and moved into "stage 1 sound folder". Note that, in theory, the sound might cross
threshold up to 22000 in each second of recording, and in practice even a single syllable
may cross the threshold hundreds of times.
Direct recording: is for using SAP2 as a simple on/off tape recorder, you should set up
recording epochs. In this case, a wave file is saved every 30seconds.
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