Values representative of modulation signal components are extracted from a modulated signal. The modulated signal contains a modulation signal. A periodic time segment sequence is defined having at least four ordered time segments. Multiple sets of signal values are acquired from the modulated signal. For each signal value, a difference in the modulated signal during each of two of the ordered time segments is acquired, as the signal value. The two ordered time segments differ in their order within the sequence by half of the number of ordered time segments in the sequence. Each set is acquired over multiple repetitions of the periodic time segment sequence. Each set is acquired during different ordered time segments than each other set. Each signal value is representative of a modulation signal component.