| 摘要 |
<p>A digital-to-analog converter which develops an analog output representative of the difference between two digital inputs represented by the rates of two series of pulses. A prescribed number of pulses of each series is counted (12) to develop two oppositely directed counter pulses, each having a duration dependent upon the time required to count the prescribed number of pulses. The counter pulses are integrated (14, 16; 18, 16) and the integration signal is sampled at the mid-point of each rise and decay. The average of the samples of each rise and decay represents the difference between the rates of the two series of inputs pulses.</p> |
