Abstract: A method is disclosed for recovering a digital signal from an analog signal. A received analog signal value is compared with a centre threshold, and with at least one of a pair of outer thresholds, to form comparator output signals. Digital samples of the comparator output signals are formed using a recovered clock signal. The values of the outer thresholds are adapted such that a constant proportion of the digital samples represent received signal values lying between the outer thresholds, and the phase of the recovered clock signal is adapted such that the separation of the outer thresholds is maximised. Other receiver parameters can be adapted in the same way.