In a digital symbol receiver (6) it is necessary to generate a clock signal with a correct frequency and phase, so that decisions â k about the value of transmitted symbols a k can be made at the right detection instants. A simple method of obtaining the desired clock signal is adjusting a VCO by means of a control signal obtained from the correlation of a detection signal r(t) with the detected symbols â k filtered by a symbol filter (11). The symbol filter (11) may comprise a cascade connection of a differentiator (16) and a filter (18) which has a transfer function which is an estimate of the transfer function of the channel.