Section 5 — Sampling EPS-16 PLUS Musician's Manual
The digital sampler does not record the actual sound but rather a series of discrete
numbers, each of which represents the level of the signal at a given instant in
time.
On playback, the EPS-16 PLUS reconstructs the original signal by "connecting
the dots," producing an output voltage which corresponds to the numbers in its
memory (shown below). This voltage can then be amplified and sent to speakers,
which turn it back into pressure waves in the air so that we can hear it.
Sample Rate
The sample rate determines how often the signal is measured (that is, how close
together the dots would be in the illustration above). A sample rate of 30 KHz,
for example, means that we are sampling the signal 30,000 times each second. A
higher sample rate will yield a more accurate picture of the waveform and better
high frequency response. But keep in mind that a higher sample rate also will use
up the EPS-16 PLUS memory more quickly, since you are generating more
numbers per second that have to be stored in that memory.
The EPS-16 PLUS can sample at any of seven different sample rates, from 11.2
KHz (11,200 samples per second) to 44.6 KHz (44,600 samples per second).
To give you some frame of reference, Compact Discs are recorded at 44.1 KHz,
Digital Audio Tape (DAT) at 48 KHz. You can adjust the EPS-16 PLUS sample
rate by scrolling one step to the right after entering sample mode (see the
discussion later in this section).
5 - 2
What is Sampling?
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