Patent ID: 8892434

Claim:
A voice emphasis device comprising: a correlation component removal filter circuit configured to remove a correlation component from a voice signal produced at a specific sampling frequency; and a voice signal processor configured to execute signal processing on the voice signal based on an output of the correlation component removal filter circuit, the correlation component removal filter circuit being a lattice-type filter circuit in which a feedforward filter and a feedback filter are combined, and the feedforward filter and the feedback filter configured to update a filter coefficient on the basis of the specific sampling frequency according to the following formula: k i,j+1 =k i,j +α×f i /b i−1 (where k i,j is a filter coefficient at a i-th level of the lattice-type filter circuit at a time j, k i,j+1 is a filter coefficient at the i-th level of the lattice-type filter circuit at a time j+1, i is a natural number from 1 to n, n is a number of levels of the lattice-type filter circuit, α is a constant (0.0≦α≦2.0), fi is a feedforward predicted error signal at the i-th level of the lattice-type filter circuit, and b i−1 is a feedback predicted error signal at the i-th level of the lattice-type filter circuit).