The present technology relates to a signal processing device, a signal processing method, and an electronic device that reduce the influence of crosstalk. In one example, a signal processing device includes a plurality of comparators; a delay unit adapted to delay output of each of the plurality of comparators; and a subtractor adapted to subtract, from a supplied signal, a signal from the delay unit. The signal processing device processes signals transmitted in N phases and includes (N-1) or more comparators. Each of the plurality of comparators has a different threshold value set and compares a received signal with the threshold value, and in a case where the signal transitions between a plurality of voltage levels, the threshold value is set to a value within adjacent voltage levels. In a second example, a reception device that receives a signal transmitted in multiple phases and via multiple lines.