| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a voice signal amplifying device by which whole volume feeling is not damaged. <P>SOLUTION: The voice signal amplifying device provided with a preamplifier 4 and a power amplifier 6, which amplify a voice signal and drive a speaker 7 is provided with a digital signal processor 5 arranged in prestage of the preamplifier 4, a filter circuit 5 filtering a component of a specified frequency band from an output signal of the preamplifier 4, a level detection circuit 8 extracting an envelope of an output signal of the filter circuit 5 and a microcomputer 9 limiting an output level for the digital signal processor 3 and outputting a command when an output signal of the level detection circuit 8 exceeds a prescribed value. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
