| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a BTL-connected audio output device capable of reducing manufacturing costs by eliminating the necessity of passive type LPF for generating woofer audio signals. <P>SOLUTION: An audio output device includes: a mixing part 10 for generating an L+WF signal and an R-WF signal admixed with audio signals of WF (woofer) channel by mixing the audio signals of L (left) and R (right) channels: and power amplifiers 4 and 5 for amplifying the L+WF signals and the R-WF signals. By connecting the output of the power amplifiers 4 and 5 to the WF channel speaker 8 in BTL, a mixing part 10 disposed at a stage in front of the power amplifiers 4 and 5 becomes possible to generate audio signals of the WF channel. Therefore, a passive type low pass filter required to be disposed at a stage behind the power amplifiers 4 and 5 can be eliminated. <P>COPYRIGHT: (C)2012,JPO&INPIT |
