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117
ACQUISITION AND STORAGE
ACQUISITION AND STORAGE
9
Sweeps
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Fig. 9.2 Sweep combined with a continuous recording
Perception has the powerful possibility to record certain parts of the recording at a dif-
ferent sample rate. Certain intervals of the recording (called sweeps) are recorded at a
high sample rate whereas the continuous parts are recorded at a reduced sample rate.
Sweeps allow to get detailed high-frequency and transient information about time-lim-
ited events while keeping the size of the recording and the data rate limited. Sweeps
togetherwithgroupsgivesignicantexibilityongettingdetailedinformationabout
physical quantities while not having to record all data at high a sample rate, keeping
the acquisition feasible and the total recording size manageable. See Fig. 9.2 for a
sweepwithuser-denedpre-triggerandpost-triggertimesrecordedathighsample
rate. For illustration it is combined with a reduced rate continuous recording where, by
userdenition,someofthedataisnotstored.