Carrier-based measurements usually obtain signals which are as well modulated in amplitude as in phase. Such complex modulated information needs to be separated with special methods extensively described in the literature. One problem is common for all methods: the costly processing of signals makes the use of microprocessors necessary. But this again raises the price of a measurement device so that a cheaper, completely hardware-based demodulation principle is desired. A basic method with hard restrictions concerning the modulation depth was introduced at the XVth IMEKO World Congress in Osaka and additional improvements for a more reliable device are shown in this paper.
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