A frequency domain characteristic of a system under test (SUT) is measured by using a digital signal corresponding to a swept frequency analog signal. In the case of a digital SUT, the digital signal is applied to the SUT, the output signal from the SUT is converted to analog form, and a measure of the...http://www.google.fr/patents/US4613814?utm_source=gb-gplus-shareBrevet US4613814 - Method of measuring a frequency domain characteristic
Method of measuring a frequency domain characteristic
