Abstract: An echo canceler for canceling echo components having a plurality of cascade-connected adaptive filters and a plurality of update control means. The echo canceler may further include an update control selective circuit for generating selective signals which enable or disable the update control means. Power values of opposite speech signals generated from the adaptive filters are used to control the updating of filter coefficients of the adaptive filters.

Abstract: In a method of processing a multi-function key in a key inputting device, such as a multimedia keyboard, the scan code value of the multi-function key consists of the “windows key code” as a first value, one or more code keys of “ctrl”, “alt” and “shift” as a second value, and “a selected key code” as the third value, thereby forming a scan code value of the multi-function key being made to not overlap with a normal key or a combination of the normal keys, thereby preventing any collision or overlapping of codes, and ensuring the stability of the key codes.