| 摘要 |
PURPOSE:To amplify the output of a speaker by connecting the speakers of both sides of channel arranged forward between the output terminals of an amplification circuit BTL-connected respectively and simultaneously connecting the speaker of both sides of the channel arranged backward between the output terminals of the amplification circuit of both sides of the channel which mutually operate in in-phase relation. CONSTITUTION:Signals of which sound field are amplified are respectively impressed on the speaker 27 for the forward right channel connected between a BTL-connected first amplification circuit 2 for the right channel and a second amplification circuit 6 for the right channel as load and the speaker 28 for the forward left channel connected between a BTL-connected first amplification circuit 13 for the left channel and a second amplification circuit 17 for the left channel as the load. Therefore the big output of the speaker can be obtained in comparison with the case that one amplification circuit is used. Besides, surrounding effect can be obtained by a first speaker 29 for backward and a second speaker 30 for backward arranged both sides of the backward. |
