Extreme value detection device for physical quantity

摘要

PCT No. PCT/EP87/00740 Sec. 371 Date Aug. 26, 1988 Sec. 102(e) Date Aug. 26, 1988 PCT Filed Nov. 28, 1987 PCT Pub. No. WO88/04478 PCT Pub. Date Jun. 16, 1988.An arrangement for aligning an antenna by determining an extreme value maximum or minimum of a predetermined physical dimension which is dependent on the alignment of the antenna. A voltage is generated in proportion in the magnitude of the physical parameter or dimension, and this voltage is applied to a voltage-to-frequency converter which converts this voltage into an acoustical signal. This acoustical signal has a frequency which is inversely proportional to the voltage. The acoustical signal is applied to the control input of an electronic switch which is actuated by an oscillator. Groups of pulses in the output signal from the oscillator are obtainable at the output of the electronic switch, in synchronization with the acoustical signal. When the antenna is misaligned, the acoustical signal has a relatively high frequency, while the voltage has a relatively low level. When the antenna is close to alignment on the other hand, the frequency of the acoustical signal is relatively low, while the voltage has a relatively high level.