Patent ID: 8879661

Claim:
A signal processing apparatus configured to correct a distortion introduced by a signal processing path into a processed signal, the signal processing apparatus comprising: a transformer that transforms the processed signal into a transformed signal in frequency domain; a processor that determines a first correction function and a second correction function upon the basis of a transfer function of the signal processing path; a first multiplier that multiplies values of the transformed signal with coefficients of the first correction function to obtain a first corrected signal; a signal reverser that reverses an order of values in a copy of the transformed signal to obtain a reversed transformed signal; a second multiplier that multiplies values of the reversed transformed signal with coefficients of the second correction function to obtain a second corrected signal; and an adder that adds the first corrected signal and the second corrected signal to obtain a corrected output signal, wherein the processor is configured to determine the first correction function C 1 and the second correction function C 2 for correction upon the basis of the following formula: C 1 =½ [H c ( I )+ H c ( Q )] CD −1 C 2 =½ [H c ( I )− H c ( Q )] CD −1 , wherein H C (I) denotes an in-phase part of the transfer function of the signal processing path, wherein H C (Q) denotes a quadrature part of the transfer function, and wherein CD −1 denotes a chromatic dispersion compensation function.