Myopulse modulation

Finally, it is possible to have a combination of PWM and PPM where one has variable width pulses and variable periods. In all cases, the output PWM stream is a series of pulses in which the dc voltage level is proportional to the ratio of the amount of on time with respect to the amount of off time for the pulses in the stream. Myopulse modulation, as implemented by Childress (1973) in his myoelectric controller, is an example of this form of pulse modulation (Fig. 32.25). This is an elegant proportional controller that can be implemented with a minimum of components. Because percentage myoelectric signal on time (EMG signal level above an arbitrary threshold) is monoton-ically related to muscle output force level, a proportional signal can be achieved very simply. This... 

Myopulse modulation (Childress, 1973) offers a means of processing myoelectric signals that maximizes the speed of response of an externally powered component. This technique eliminates the delays that are introduced by analog or digital filtering methods, provides proportional control. 

FIGURE 32.32 Photograph of different electrode configurations, a) Hosmer-Dorrance Myopulse modulation electrodes and controller, note physically separate reference electrode to improve the common mode rejection ratio (CMRR). (6) and (c) Otto Bock electrodes with integrated reference electrodes. 

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See also in sourсe #XX -- [ , , , ]

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