Waveform shaping device, equalizer, receiving system, method of controlling waveform shaping device, control program, and computer-readable medium in which control program is recorded

A waveform shaping device, which shapes a waveform of an input signal from distortion compensation means positioned outside for compensating a distortion of a signal and outputs the input signal with the shaped waveform as an output 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.

A method of controlling 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 method comprising the steps of:
• removing at least a direct current component from frequency components of the input signal so as to generate a low-frequency-free signal;
• 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
• adding the nonlinear process signal to the input signal so as to generate the output signal.

A method of controlling a waveform shaping device which shapes a waveform of an input signal from distortion compensation means positioned outside for compensating a distortion of a signal and outputs the input signal with the shaped waveform as an output signal,

• said method comprising the steps of:
• removing at least a direct current component from frequency components of the input signal so as to generate a low-frequency-free signal;
• 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
• adding the nonlinear process signal to the input signal so as to generate the output signal.