| 摘要 |
A sound reproduction system comprises a digital audio signal input ( 1 ), a digital audio signal processor ( 2 , DSP) and a digital audio signal output ( 1 ) wherein the digital signal processor ( 2 , DSP) comprises a high pass filter ( 21 ) with a pass frequency (f) of between first and a second frequency, e.g. between 300 Hz and 2 kHz, a compression amplifier ( 22 ) for compression and amplification of a signal to within a signal amplitude range and a clipper for clipping the signal above a clipping level, and preferably a low pass filter ( 23 ) for filtering the signal provided by the compressing amplifier and for providing an output signal, the pass frequency of the low pass filter (f) lying in the range 2 kHz-Fs/2 where Fs is the sampling frequency. 10 Fs/2 may be e.g. 4 kHz. The parameters of the various elements such as cut-off frequency, order of the pass filter, gain, etc are preferably dependent on a measured noise level. |
