Patent ID: 7986796

Claim:
An apparatus to generate multi-channel audio signals, comprising: a voice signal removal unit to generate a first signal by removing one or more components of a plurality of frequency bands corresponding to a voice frequency range from an input signal having channel signals; a voice component amplification unit to generate a second signal by calculating a sum signal of the channel signals of the input signal and amplifying one or more components of a plurality of the frequency bands of the sum signal corresponding to the voice frequency range; a multi-channel audio signal generation unit to generate a center-channel audio signal and a front-channel audio signal using the first signal and the second signal; and a conditioning filter unit to generate another signal by calculating a difference signal using channel signals of the first and to remove one or more components corresponding to a predetermined intermediate frequency band from the difference signal, the conditioning filter including: a band-reject filter to generate a compensation signal by removing one or more components corresponding to a predetermined intermediate frequency band from the difference signal; and an equalizer unit to control magnitudes of the compensation signal by applying different gains to frequency bands of the compensation signal to generate the another signal, wherein the multi-channel audio generation unit further generates a surround-channel audio signal according to the first signal and the another signal.