Methods and devices for enabling and disabling updating an adaptive filter for echo cancellation of a communication device are disclosed. At the rear of back plate are lower pins that extend outward from back plate. This method for cleaning polysilicon allows organic materials, particles and metal impurities adsorbed on the surface of polysilicon to be removed at a low cost, and to increase the freeing rate. When fixed to top and bottom shafts with one O-ring in a groove on the male component aligned with a receiving groove of the female component, a sheet of paper fed between the drums will be creased by the pressure of the O-ring forcing the paper into the receiving groove. The ensemble of electronic equipment upon the bail band may be in microcircuit form, including placing the components on a copper layer polyimide flexible strip.