In a signal processing apparatus, a speech coder includes, as three sections for coding speech data by different algorithm, an Algorithm-A coding section, an Algorithm-B coding section and an Algorithm-C coding section. A heat dissipation device having a base portion is positioned over a back surface of the microelectronic device and having at least one lip portion extending from the base portion which is attached to the substrate. Thus, if the anchor is in a reverse position, contacting the sea ground through the edge of the shank and the back edge of the fluke, it will roll on the edge of the shank and turns to the anchoring position. The mobile unit is assigned to one of the plurality of multicast groups based on the indicated channel quality and the plurality of first channel quality ranges. Scheduling information can be transmitted using a hierarchical scheduling scheme in which a femtocell base station is allocated resources from a macrocell base station and the femtocell base station then allocates resources to femto users within its own resource region.