| 摘要 |
<p>A procedure for filtering an incoming signal, representing a sound, in order to achieve an intended modification to the character of the sound, comprises feeding the incoming signal to a number of parallel filter branches, convolution of the signal in the branches and mixing of the branches' output signals. During the procedure time discrete digital signals are used. The convolutions are executed with differing sampling frequencies for signals in the various branches. Those for convolution used taps are kept at a distance of one sampling period from each other, and the convolutions in all branches together are executed with minimum 5000 taps. A filter device for the realization of the procedure comprises a number of parallel connected part-filters of transversal type and a mixing device to mix the part-filters' output signals. The used taps of the part-filters are placed at a distance of one sampling period from each other. The part-filters together have at least 5000 taps and are arranged to work with differing sampling frequency.</p> |
