| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technology for reducing noise at a normal signal level whose operation frequency is high, further than the case of a conventional limiter circuit. <P>SOLUTION: This limiter circuit is provided with: an amplification part (4) which amplifies an input signal from an acoustic source; a negative feedback part (3) which guides a signal to be output from the output side of the amplification part (4) to the input side of the amplification part (4); and an electronic volume part (4) which is provided in the negative feedback part (3), and adjusts an attenuation amount of a signal flowing in the negative feedback part (3) when the input signal from the acoustic source is an excess signal. <P>COPYRIGHT: (C)2010,JPO&INPIT |
