Biomedical Engineering Reference
In-Depth Information
FIGURE 10-46
Measured strong
(high-level
contraction)
myoelectric signal
for a heavy
contraction.
[Adapted from
(Muzumdar 2004).]
FIGURE 10-47
Variation in
myoelectric signal
level with
contraction level as
measured by
surface electrodes.
Russian scientist, A. Kobrinski, had built a completely self-contained battery-operated
system that was later licensed for use in Canada. Within a decade systems were starting
to address cosmetic issues and contained rechargeable batteries.
The most basic control strategy is based on the amplitude of a single myoelectric
signal envelope, as shown in Figure 10-48. The process of obtaining the envelope was
discussed in detail earlier in the topic and involves rectifying the signal and then passing
it through a low-pass filter.
