Digital signal processing apparatus and method

The invention provides for signal processing apparatus (100) having a first filter means (102) for adjusting an input signal based on past data output from the apparatus (130), a summing means (106) is arranged to sum signals from the first filter means (102) and from a second filter means (104) to produce a sum signal. The apparatus also includes a symbol detection means (108) for generating an output signal from the sum signal and the second filter means (104) is arranged to provide adjustments in the output signal based on the peaks and polarity of past signals generated by the symbol detection means (108). A control means can be included for controlling the filtering properties of both the first and second filter means, wherein the control means controls the filtering properties based on the past output signals from the symbol detection means.