Patent ID: 8855182

Claim:
An emphasis optimization device configured to add an emphasis to a digital signal transmitted on a transmission path which includes a passive device and excludes an active device, the emphasis optimization device comprising: an inverse characteristic calculating circuit configured to obtain amplitude characteristic (H(f): f is a frequency of the transmission path to calculate an inverse characteristic (G(f)) of the amplitude characteristic by an expression of G(f)=1/H(f); an inverse Fourier transform circuit configured to perform an inverse Fourier transform on the inverse characteristic of the amplitude characteristic of the transmission path to obtain an impulse response of the transmission path; an impulse response extracting circuit configured to extract a fundamental wave value and first to (n−1)th (n is an integer equal to or greater than one) impulse response values corresponding to n tap positions each being a position of the digital signal to which the emphasis is permitted to be added; and an emphasis amount calculating circuit configured to calculate n emphasis amounts based on the n extracted values.