# Signal Processing¶

Signal processing elements can be drawn by importing the dsp module:

from SchemDraw import dsp


Because each element may have multiple connections in and out, these elements do not automatically extend “leads”, so they must be manually connected with LINE elements. The square elements define anchors ‘N’, ‘S’, ‘E’, and ‘W’ for the four directions. Circle-based elements also includ ‘NE’, ‘NW’, ‘SE’, and ‘SW’ anchors. Other elements, such as AMP, define ‘in’ and ‘out’ anchors when appropriate.

The ARROWHEAD basic circuit element is useful to show signal flow.

Labels are placed in the center of the element. The generic BOX and CIRCLE element can be used with a label to define other operations. For example, an integrator may be created using:

d.add(dsp.BOX, label='$\int$');