| 摘要 |
<p>A position measurement system is disclosed including an improved pulse-width modulator in which positive and negative modulation counters respectively provide first and second modulator pulses having a time displacement therebetween proportional to a displacement between relatively movable members of a transducer. The modulation counters can be loaded to store signals representative of a cumulative number of least changes of the displacement, and clock pulses are provided to the modulation counters whereby the modulator output pulses are generated. The time displacement between the output pulses is changed in proportion to the cumulative number of the least changes stored by the counters. This arrangement permits the modulator counters to be modified in a predetermined fashion so that the least indicated change can represent alternatively a quantity in one of a plurality of measurement systems, e.g. in inch or metric units. In making this conversion, however, the delay in which data changes are recognizable in the output is not thereby increased and the effective information rate of the system is maintained.</p> |
