ESI ESI2000, Руководство по эксплуатации

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Digital Processing
139
0. Sample Rate Convert
Sample Rate Conversion can be used for saving memory, increasing the
upward transposition range of a sound, or exactly matching the sample
rate to a multiple of the sounds frequency for perfect single cycle loop
(use the sample calculator).
Sampling at a high sample rate provides better frequency response than
sampling at a slower rate, but uses up more memory. If you need to
reclaim some of that memory, and are willing to trade off sample fre-
quency response, samples can be converted from a higher rate to a lower
one. Use your ear to compare sounds at the two sample rates. If you
can’t tell the difference, use the lower rate.
1. Activate Digital Processing module.
2. Select Digital Tools II (8), Sample Rate Convert (0). The display
will show the current sample rate and sample size.
SAMPLE RATE CVT f:0
Rate: 22050Hz
Size: 107220
Loop Size: 5035.00
3. Select the new sample rate and press ENTER. The display
updates the sample size to reflect the new sample rate. The Loop
Size display shows the size of the resulting loop. If a fractional
number is shown, you may want to adjust the sample rate until the
loop size is an integer, otherwise the loop size will be slightly altered
by the conversion process.
The “
f
” in the upper right corner indicates the reconstruction filter that
is used in the resampling process. Higher numbers indicate more
interpolation filtering (cutting more high frequencies). There are six
interpolation filter frequencies (0-5).
Tip: By performing successive sample rate conversions with lower
reconstruction filter numbers, the automatic filtering system can be
subverted and the sample can be kept brighter.
4. If you are not satisfied with the resulting sample rate conver-
sion, or want to compare before and after, proceed to Digital
Processing, Undo (9).