| 摘要 |
High and low frequency components C<SUB>n1</SUB>, C<SUB>n2 </SUB>are generated by causing a center channel audio signal Cn to pass through a high-pass filter HPF and a low-pass filter LPF, and the high frequency component C<SUB>n1 </SUB>is supplied to the center channel loudspeaker SP<SUB>C</SUB>. Also, two low frequency components C<SUB>n2L</SUB>, C<SUB>n2R</SUB>, which have a different phase mutually, are generated by causing the low frequency component C<SUB>n2 </SUB>to pass through phase shifters 2, 3 . An synthesized audio signal SL is generated by synthesizing the low frequency component C<SUB>n2L </SUB>and the front-left channel audio signal FL, and then supplied to the front-left channel loudspeaker SP<SUB>L</SUB>. An synthesized audio signal SR is generated by synthesizing the low frequency component C<SUB>n2R </SUB>and the front-right channel audio signal FR, and is supplied to the front-right channel loudspeaker SP<SUB>R</SUB>.
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