Voice emphasis device

摘要

There is provided a voice emphasis device with which voice clarity can be improved. This voice emphasis device comprises a correlation component removal filter circuit that removes a correlation component from a voice signal produced at a specific sampling frequency, a multiplication circuit that produces an extracted signal by multiplying a specific gain coefficient by the output of the correlation component removal filter circuit, and an arithmetic circuit that adds or subtracts the extracted signal to or from the voice signal. The correlation component removal filter circuit is a lattice-type filter circuit that combines a feedforward filter and a feedback filter. The feedforward filter and the feedback filter update the filter coefficient at the specific sampling frequency based on the formula ki,j+1=ki,j+α×fi/bi−l.

主权项

1. 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:
ki,j+1=ki,j+α×fi/bi−1 (where ki,j is a filter coefficient at a i-th level of the lattice-type filter circuit at a time j, ki,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 bi−1 is a feedback predicted error signal at the i-th level of the lattice-type filter circuit).