| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sound signal amplitude limiter whereby a reproduced sound with a less sense of distortion can be obtained even when the amplitude of the sound signal is considerably limited so as to enhance the sound quality of hearing-aids and recording units or the like. <P>SOLUTION: The sound signal amplitude limit unit includes: an amplitude limit circuit 1 for placing a limit onto a received sound signal; a pre-stage subtractor 2 provided to an output side of the amplitude limiter circuit; a low pass filter 3 for cutting off high frequency components in an output signal from the subtractor; a delay circuit 4 connected in parallel with the low pass filter 3; and a subtractor 5 connected to the post-stage of the low pass filter 3 for providing a processing finished signal. The pre-stage subtractor 2 receives the sound signal and executes processing of subtracting an output signal of the amplitude limiter circuit from the received sound signal. The delay circuit 4 receives the sound signal and carries out delay processing to synchronize the output signal from the low pass filter with the received sound signal. The post-stage subtractor 5 receives the output signal from the delay circuit, subtracts the output of the low pass filter from the received output signal from the delay circuit, and provides an output of the subtraction result. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
