| 摘要 |
<p>A method of noise reduction wherein two versions (10, 16) of the same original signal, for example of a recording, are simultaneously processed, one being supplied to a digital filter (18) and the other to a delay (12). The difference between the filtered input and delayed input gives an error signal, and the error signal is processed by a microprocessor programmed with an adaptive algorithm and fed back to vary the characteristics of the filter in such a manner as to reduce the error signal to a minimum, whereupon the digital filter provides the enhanced signal.</p> |
