7. The input signal x(t) = 3cos(2000t)+ 2cos(3000 – A/2) + 4cos(5000 + T/4) + cos(7000 + a 4) + cos(9000rt) When the signal pass a filter with specified frequency response, (a) or (b) or (c) or (d), please find out the components of output signal. -3000 -4000 -2000 3000 4000 2000 (a)理想低通减波器 (c)理想孕通减波器 1 -3000 10 3000 -4000 <-3000 4000 3000 (b) 理想高通流波器 (の)建想中止流波器

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.