I understand Conv2D filters. I think I understand Conv1D filters as well but have not seen any examples of the filters like what we have in 2D filters, e.g. Sobel as shown in the following image. Are there any standard one dimensional filters?
Sobel 2D Filter example
Images are two dimensional signals. The use of Conv1D is for one dimensional signals like voice and sound. CNNs are good for these signals too because of taking care of local input patterns. Definitely there are standard one dimensional filters which are most used in signal processing like high pass filters and low pass filters which are so much popular. In order to show you an example take a look at the following figure which illustrates the convolution of two signals:
