The invention relates to improving parameter estimation and speech synthesis. A transistor includes an oxide semiconductor layer formed over an insulating layer, a source electrode layer and a drain electrode layer which overlap with part of the oxide semiconductor layer, a gate insulating layer in contact with part of the oxide semiconductor layer, and a gate electrode layer over the gate insulating layer. In another embodiment, a data processing system program product may perform a method of sending information related to a view request from the user for an electronic site. In the case of one type of read-only memory element, this mask is mainly blocked, leading to formation of a transistor with a non-conductive channel between source and drain.