Two signals m, (t) = m2(t) = cos(2n × 15t) are both to be transmitted simultaneously over a channel by multiplexing scheme as shown in figure Q3. The signal at point b is the multiplexed signal, which now modulates a carrier of frequency cos(2n x 100t). The modulated signal at point c is transmitted over a channel. m(1) Σ m2(t) a c2(t) = cos(2n x 100t) c (t) = cos(2n x 35t) Figure Q3

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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.