Patent ID: 8427256

Claim:
A waveform shaping device, which shapes a waveform of an externally input signal and outputs the input signal with the shaped waveform as an output signal to distortion compensation means, positioned outside, for compensating a distortion of a signal, said waveform shaping device comprising: low-frequency component removing means for removing at least a direct current component from frequency components of the input signal so as to generate a low-frequency-free signal; nonlinear process means for generating a nonlinear process signal (i) in which positive and negative signs of the low-frequency-free signal are retained and (ii) which broadly monotonically increases nonlinearly with respect to the low-frequency-free signal when values of the low-frequency-free signal are at least in the vicinity of 0; and addition means for adding the nonlinear process signal to the input signal so as to generate the output signal.