测控技术与仪器专业英语 张凤登UNIT-12.Real World Signal Processing
9页1、UNIT 12 Real World Signal Processing,12.1 Text Analog to Digital and Digital to Analog Conversion A/D和D/A转换,New Words potentiometer pu,tenimit n. 电位计,分压计 digitize diditaiz v. 将数字化 predefine pri:difain v. 预定义 quantize kwntaiz v. 量化 increment inkrimnt n. 增加,增量 acquisition ,kwizin n. 获取,采集,探测 imperfect imp:fikt a.; n. 半完成的,减弱的;未完成体,Exercises 1. Answer the following questions. A/D and D/A converters are used to interface a digital-computer-based industrial controller with analog device. On the input
2、 side of a computer, a measurement process provides an electric signal in analog form. Signals that drive actuators on the output side are controlled by binary digital outputs. The full range of the device is 05 volts. The input binary count can range between 0210. Since there are 210-1=1024-1=1023 increments over the full range of the 5-0=5 volts, the step size of the 10-bit D/A converter is 5/1023=0.00489 volts. This is accomplished by sampling the analog input at discrete intervals of time an
3、d mapping each sample into one of the discrete quantizing levels. An A/D converter has 2n discrete quantizing levels, where n is the number of bits in the register of the A/D converter. In the case of the 10-bit A/D converter, the percent resolution can be computed using equation (12-2). Accuracy and linearity errors are in addition to resolution inaccuracies.,Exercises (continue) 2. According to the text, fill in the blanks with suitable words and values given below in the correct form. number
4、digital A/D analog amplify sampling quantizing encoding 0.75 8 map sample level practical largest ideal scale conditioning store degree actual resolution discrete (1) number (2) digital A/D analog sampling quantizing encoding (3) 8 (4) 0.75 (5) samples discrete maps level (6) largest practical ideal (7) degree stored actual resolution (8) scale amplified conditioning,12.2 Reading and Translation Digital Signal Processing 数字信号处理,New Words ingredient inri:dint n. 成分,因素 frame freim n. 帧,换面 physiolo
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