Practical Biomedical Signal Analysis Using MATLAB

6 Practical Biomedical Signal Analysis Using MATLAB

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FIGURE 1.2: Illustration of the aliasing effect. Samples taken every 0.1 s from

a 9 Hz sinusoid (black) are exactly the same as these taken from the 1 Hz sinusoid

(gray).

FIGURE 1.3: Illustration of the quantization error for a 3 bit ADC. The digitized

representation (black line) of the continuous sinusoid (gray line). The range of 2 [V]

is divided into 8 levels. The sampled signal values (black dots) are rounded to the

nearest ADC level.

so that ±200μV covers the full range of a 12 bit ADC. This range is divided into bins

of 400/2

12

= 400/4096 ≈ 0.1 μV. It means that we measure the amplitude of